Caterpillarforest productstree harvester
Caterpillar HA771
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar HA771 is a self-propelled wheel feller buncher: an articulated, rubber-tired forestry carrier built to run a felling head as a mounted work tool rather than a harvester or a bare attachment on its own. The chassis pairs an oscillating front axle with a fixed rear axle, planetary final drives, wet-disc service brakes, and hydrostatic propulsion, the layout Caterpillar used across its whole HA-series (HA770, HA771, HA870, HA871). The line comes from the Hydro-Ax and Prentice forestry business Caterpillar picked up through its acquisition of Blount Inc.'s forestry division in the mid-to-late 2000s, badged under Cat's own HA model numbers for a short window before the range moved onto Cat-numbered wheel feller bunchers. No factory engine rating, operating weight, or dimension set specific to the HA771 nameplate has surfaced in published spec sheets. Machines in this chassis class and era typically ran a mid-range industrial diesel and carried an unloaded operating weight in the low-to-mid teens of metric tons before a felling head was fitted, and the HA770/HA771 and HA870/HA871 pairs most likely split by felling-head size or type rather than by chassis.
Caterpillar carried this chassis platform forward into its own numbering. The 533 and 543 wheel feller bunchers that followed share axle housings, final-drive components, and wet-disc brake parts with the HA770/HA771/HA870/HA871 line and ran a Cat 3126 or 3126B diesel; the C-series that came after (553C/563C/573C) moved the same basic platform onto the C6.6 ACERT engine to meet current emissions rules. The HA771 sits at the front of that chain, before Caterpillar gave its forestry lineup dedicated part numbering, which is why so little about it made it into public spec databases. That makes it a low-volume, largely undocumented nameplate today: figures that circulate for it are often borrowed from the 533/543 or from the track-mounted siblings that share the same-era driveline parts. For a buyer or rebuilder, the practical approach is to treat it as a parts-interchange machine first and confirm any component fit against the unit's own serial number, since the used and parts market for this model runs on cross-reference to its better-documented siblings rather than a dedicated factory spec sheet.
Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.
Caterpillar HA771 specifications
Engine
| Model family | The HA771 is a wheeled forestry swing machine (wheel feller buncher) in the Caterpillar Forest Products line, built alongside the closely related HA770, HA870, and HA871. No engine make, model, gross or net power, displacement, cylinder count, or emissions tier is published for this unit in any available spec source. Confirm the powerplant fitted to a given serial number through your dealer's parts and service records. |
Weights
| Operating weight | Not published for this model in available spec sources. |
| Shipping weight | Not published for this model in available spec sources. |
| Ground pressure | Not published for this model in available spec sources. |
Dimensions
| Transport length/width/height | Not published for this model in available spec sources. |
| Wheelbase / track gauge | Not published for this model in available spec sources. |
| Ground clearance | Not published for this model in available spec sources. |
Performance
| Travel speed | Not published for this model in available spec sources. |
| Felling/bunching performance | Not published for this model in available spec sources. |
| Gradeability | Not published for this model in available spec sources. |
Service capacities (summary)
| Fuel tank | Not published for this model in available spec sources. |
| Hydraulic system | Not published for this model in available spec sources. |
| Engine oil | Not published for this model in available spec sources. |
| Cooling system | Not published for this model in available spec sources. |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
HA771 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | Not documented for this model/serial range in available sources. Verify against the machine's OMM or with a Cat dealer. | Caterpillar Diesel Engine Oil (Cat DEO), API CG-4/CF-4 grade diesel engine oil. SAE 15W-40 for general operation; SAE 10W-30 in cold climates. |
| Cooling system | Not documented for this model/serial range in available sources. Verify against the machine's OMM or with a Cat dealer. | Caterpillar Diesel Engine Antifreeze/Coolant (Cat DEAC), pre-mixed 50/50 with water. Cat Extended Life Coolant (ELC) is an acceptable alternative on later-production units. |
| Fuel tank | Not documented for this model/serial range in available sources. The fuel tank is built into a combined fuel-and-hydraulic-oil frame casting at the rear of the machine. Verify against the machine's OMM or with a Cat dealer. | No. 2-D diesel fuel meeting the engine's fuel specification; low-sulfur or ultra-low-sulfur grade per the engine's emissions tier. |
| Hydraulic system and tank (shares circuit with hydrostatic drive) | Not documented for this model/serial range in available sources. The hydraulic tank is combined with the fuel tank in one rear frame casting. Verify against the machine's OMM or with a Cat dealer. | Caterpillar TDTO (Trans/Drive Train Oil) or Cat HYDO Advanced hydraulic oil, multigrade. Use a lighter grade (TDTO 10W or HYDO Advanced 10) in cold climates and a heavier grade (TDTO 30 or 50) in warm climates. |
| Front axle (oscillating) and differential | Not documented for this model/serial range in available sources. Verify against the machine's OMM or with a Cat dealer. | Caterpillar TDTO (Trans/Drive Train Oil), viscosity selected to ambient temperature per the standard Cat axle-oil chart. |
| Rear axle (fixed), planetary final drives and locking differential | Not documented for this model/serial range in available sources. Planetary final drives and wet-disc brakes share the axle-housing oil, not a separate fill point. Verify against the machine's OMM or with a Cat dealer. | Caterpillar TDTO (Trans/Drive Train Oil), same grade as the front axle. |
| Grease (all fittings) | Not applicable - service item, no fill capacity. | Caterpillar Multipurpose Grease (Cat MPGM), NLGI 2. Use Cat Arctic Platinum grease or an equivalent NLGI 1/0 low-temperature grease in sustained cold below about -20 C (-4 F). |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar HA771 maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
Servicing the HA771 beyond the schedule
Predictive Maintenance & Fluid Analysis
Run scheduled oil sampling on the engine, hydrostatic drive case, and planetary final drives. Sawdust and hydraulic-fluid contamination show up faster in forestry duty than in earthmoving service. Track hydrostatic charge pressure and drive-motor case-drain flow over time to catch pump or motor wear before a hydrostatic failure strands the carrier in the block. Watch wet-disc brake fluid condition and felling-head accumulator pre-charge as leading indicators; both degrade under the constant work-tool cycling this chassis sees daily.
Corrective & Common Repairs
Expect articulation hitch pins, oscillating front-axle bushings, and drive-shaft U-joints to wear fastest on this chassis; forestry ground contact and constant steering cycles load them harder than a construction duty cycle. Wet-disc brake packs and final-drive seals are the next common failure points, usually showing up as oil in the brake housing or a soft pedal. On the felling-head side, replace worn wear plates, saw or shear pivot bushings, and hose fittings before they cause a hydraulic circuit failure mid-cut.
Overhaul & Rebuild Points
Plan a driveline rebuild around the hydrostatic pump and motor, planetary final drives, and oscillating axle center section together; these wear as a set under this machine's constant load-reversal duty. Rebuild wet-disc brake packs and axle bearings at the same interval rather than waiting for a failure, since axle downtime idles the whole carrier. On the attachment side, budget for a felling-head rotation-bearing and accumulator rebuild, and re-torque or replace the head-mounting pins and bushings that take the shock load of every tree cut.
Seasonal & Environment Servicing
Switch to a lower-viscosity engine, hydraulic, and hydrostatic-drive oil grade ahead of cold-weather logging, and confirm coolant protection for the working climate before each season change. Clear packed sawdust and bark debris from the radiator, oil cooler cores, and final-drive housings often; this chassis works in heavier debris than a typical earthmoving site and cores clog fast. Check cab air filtration and pressurization seals for dust ingress, and inspect exposed hydraulic hoses and wiring for abrasion from brush and slash.
HA771 common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 185-8154 | Filter Element-Cab Air | Air intake service | Check fitment → |
| 6C-9226 | Filter Element-Cab Air | Air intake service | Check fitment → |
| 1G-8878 | Filter As-Oil | Hydraulic service | Check fitment → |
| 207-5035 | Filter Element As-Oil | Hydraulic service | Check fitment → |
| 126-1814 | Filter-Oil | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
HA771 fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| 100-1 | Engine oil pressure reading below the normal operating range for current engine speed (most severe oil-pressure alarm level). | Low oil level, worn oil pump or stuck pressure-relief valve, a plugged oil filter, or a faulty oil pressure sender/wiring. | Shut the engine down immediately, check oil level and condition, then confirm pressure with a mechanical test gauge before restarting. |
| 110-0 | Engine coolant temperature reading above the normal operating range. | Low coolant level, a blocked radiator core, a failed thermostat, a slipping or failed fan drive, or a shorted temperature sender. | Reduce load and idle the engine down, then once it is safe check coolant level and inspect the radiator and fan drive. |
| 111-3 | Coolant level sensor circuit reading outside its expected voltage range, or a genuine low-coolant condition depending on the paired failure mode. | Coolant below the sensor in the surge tank, a corroded sensor connector, or open/shorted wiring to the coolant level sensor. | Check coolant level visually first, then inspect the sensor connector and harness for corrosion or damage. |
| 168-2 | Electrical system (battery/charging) voltage signal at the ECM is erratic or intermittent. | Loose or corroded battery terminals, a failing alternator or voltage regulator, or a poor ECM ground connection. | Check battery terminals and ground straps for corrosion, then load-test the charging system output. |
| 190-8 | Engine speed/timing sensor signal frequency is abnormal. | Incorrect sensor-to-timing-ring air gap, damaged timing ring teeth, or a chafed/loose sensor harness. | Inspect and reset the sensor air gap to the service specification, then check the harness for chafing or loose connectors. |
| 164-11 | Injection actuation (hydraulic) pressure reading is lower than the pressure the ECM is commanding, on engines that use a hydraulically-actuated electronic unit injector fuel system. | A weakening high-pressure oil pump, a sticking actuation pressure control valve, aerated actuation oil, or a faulty actuation pressure sensor. | Check engine oil level and condition first, since actuation oil is drawn from the same sump on these systems, then compare desired versus actual actuation pressure with a diagnostic tool. |
| 253-2 | ECM personality module (calibration/rating file) is reporting erratic, missing, or incorrect programming. | An interrupted ECM flash or reprogram, a corrupted calibration file, or a rating file that does not match this engine's factory configuration. | Reflash the ECM with the correct factory calibration for this engine's rating using a dealer diagnostic tool. |
| 248-9 | Communication on the machine's internal data link, which ties the engine ECM to other machine control modules, is updating abnormally slowly or dropping out. | Damaged or shorted data link wiring, a failed terminating resistor, or a fault at one of the linked control modules. | Inspect data link wiring and connectors between control modules, and check the terminating resistors at each end of the link. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
HA771 attachments & work tools
Machine type and family
HA771 is a wheeled feller-buncher carrier, not a bare attachment head - the felling tool mounts on the machine's own boom/leveling linkage rather than being the tool itself. It sits in Cat's legacy wheel feller-buncher line alongside the HA770, HA870 and HA871, and shares hydraulic filtration and seal components with same-era 533/543 wheel feller bunchers and TK370-series track feller bunchers.
Felling head work tools
This class of carrier runs either a hydraulic shear-jaw head or a continuously spinning disc (hot) saw head, both able to carry an accumulator-arm assembly that gathers several stems before laying a bunch. Single-cut stem capacity typical for this size of wheel feller buncher runs roughly 56-58 cm (22-22.8 in) diameter, with accumulating area in the 0.37-0.47 sq m (4-5 sq ft) range - varies by configuration and head selected.
Head-to-carrier mounting
The felling head bolts and pins to the carrier's leveling-arm/boom linkage rather than using a universal excavator- or skid-steer-style quick coupler. A hydraulic quick-disconnect block ties the saw or shear drive, accumulator-arm, and tilt/leveling circuits between the head and the machine's implement hydraulics.
Hydraulic kit and circuit notes
The felling head draws off a dedicated high-flow implement circuit kept separate from propel and steering, sized to the carrier at the factory. Exact flow and pressure figures for this legacy model are not published in available documentation - match head to carrier through dealer fitment guidance rather than a generic spec.
Guarding and factory configuration
Factory and field guarding on this class of machine typically protects the leveling-arm tilt cylinders from limb strikes, and cab glass gets wire-mesh or polycarbonate screening against kickback and flying debris. Tire versus undercarriage guard and brush-guard packages vary by configuration and operating terrain.
Carrier lineage and size class
HA771's wheel feller-buncher line was later succeeded by Cat's 553/563/573 (and C-Series) wheel feller bunchers, which use saw heads such as the HFW221, HFW222SC and HFW232 in the same general size class. These give a useful size reference for the class but are not confirmed as the original work tool fitted to HA771.
Engine and power class
Engine model and power rating specific to the HA771 are not documented in available sources. Confirm from the machine's own dataplate before selecting engine-driven attachment hydraulics, filtration, or drive-belt components.
All HA771 assemblies by section
Every catalogued assembly group for the Caterpillar HA771. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Air Inlet And Exhaust System
240-7901 Air Cleaner Gp
| 10***81 | Hose | 1 |
| 11***60 | Strap | 1 |
| 11***02 | Block | 1 |
248-3150 Air Cleaner Gp
| 06***70 | Cap | 1 |
| 13***28 | Cover As | 1 |
| 13***29 | Valve-Dust; (Air Cleaner) | 1 |
8n-2694 Indicator Gp-Air Filter Change
| 8N***94 | Indicator-Air Filter Change; (Air Cleaner) | 1 |
240-7904 Muffler Gp
| 21***25 | Muffler | 1 |
| 21***28 | Coupling-Exhaust | 1 |
| 24***04 | Muffler Group | 1 |
Basic Engine
240-7907 Drive Gp-Fan
| 19***32 | Guard As-Fan | 2 |
| 24***07 | Drive Group-Fan | 1 |
| 24***96 | Belt-Serpentine | 1 |
241-2870 Drive Gp-Fan
| 24***21 | Hub | 1 |
| 24***22 | Spacer | 1 |
| 24***45 | Bracket As | 1 |
240-7940 Flywheel Gp
| 16***85 | Gear-Flywheel; (138-Teeth) | 1 |
| 24***40 | Flywheel Group | 1 |
| 24***41 | Flywheel As | 1 |
240-7900 Mounting Gp-Engine & Xmsn
| 24***00 | Mounting Group-Engine & Xmsn | 1 |
| 24***25 | Support As | 1 |
| 24***30 | Support As | 1 |
Cooling System
244-1935 Fan Ar-Reversible
| 14***36 | Adapter; (Straight) (-6 Orb X -6 Orfs) | 4 |
| 14***67 | Elbow Group; (Each Includes) | 3 |
| 14***78 | Elbow, 90°,-6 Orb /-6 Orfs; (90°) (-6 Orbx-6orfs) | 2 |
241-2910 Fan Ar-Reversible
| 10***04 | Kit-Receptacle; (4-Pin)(Start Switch) | 1 |
| 14***36 | Adapter; (Straight) (-6 Orb X -6 Orfs) | 3 |
| 14***67 | Elbow Group; (Each Includes) | 3 |
243-6611 Fan Gp-Reversible
| 00***60 | Bolt-12 Point Head; (1/4-20x0.875-In) | 4 |
| 0T***44 | Bolt (1.25" Long) | 1 |
| 1T***65 | Bolt 2.54 cm (1" Long) | 8 |
240-7950 Fan Gp-Suction
| 09***49 | Bolt; (M8x1.25x40-mm) | 4 |
| 19***77 | Spider As-Fan; (6-Blade) | 1 |
| 24***19 | Pulley-Fan | 1 |
240-7886 Radiator & Mounting Gp
| 13***44 | Connector | 1 |
| 14***67 | Clamp; (Hose) | 7 |
| 24***71 | Adapter | 1 |
242-3610 Radiator Gp
| 03***65 | Cap As-Radiator; (Sea Water Heat Exchanger) | 1 |
| 20***32 | Shroud As | 1 |
| 20***18 | Bracket | 1 |
Electrical And Starting System
3e-6328 Alarm Gp -Action
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 18***35 | Pin-Connector; (16-Ga To 18-Ga) | 2 |
| 3E***65 | Wedge; (Receptacle Lock) (2 Pin) | 1 |
240-7911 Battery Gp
| 03***55 | Locknut; (5/16-18-Thd)(Marked X) | 2 |
| 11***22 | Battery Group; (12-Volt, Maintenance Free, Wet) | 2 |
| 11***91 | Bracket Assem. | 3 |
9w-0742 Block Gp-Junction -Battery
| 6V***22 | Tube-Heat Shrink; (25.4-mm Dia)(10-M) | 0 |
| 7F***60 | Washer | 6 |
| 8C***58 | Block Group-Junction; (Battery) | 1 |
243-4707 Electrical Ar
| 24***11 | Battery Group | 1 |
| 24***07 | Electrical Ar | 1 |
| 24***15 | Electronics Group-Machine | 1 |
162-7755 Lamp Gp-Dome
| 15***26 | Switch; (Dome Light) | 1 |
| 15***27 | Lamp; (24-Volt)(Dome Light) | 2 |
| 15***28 | Lens; (Dome Light) | 1 |
234-4325 Lamp Gp-Flood
| 16***56 | Bracket; (Lamp Retaining) | 1 |
| 20***14 | Lens As; (Floodlight) | 1 |
| 23***25 | Lamp Group-Flood; -Suspended Mount | 1 |
105-4849 Lamp Gp-Head & Signal -Lh
| 10***45 | Lamp; (24-Volt)(Running Lights), Cover | 2 |
| 10***48 | Lens As; (Headlight)(High, Low Beam) | 1 |
| 10***50 | Lens; (Amber)(Turn Signal) | 1 |
105-4850 Lamp Gp-Head & Signal -Rh
| 10***45 | Lamp; (24-Volt)(Running Lights), Cover | 2 |
| 10***48 | Lens As; (Headlight)(High, Low Beam) | 1 |
| 10***50 | Lens; (Amber)(Turn Signal) | 1 |
145-6929 Lamp Gp-Stop & Tail
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 10***03 | Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge) | 1 |
| 14***29 | Lamp Group-Stop & Tail | 1 |
108-1029 Lamp Gp-Warning Beacon -Amber
| 10***29 | Lamp Group-Warning Beacon; (24-Volt, Amber) | 1 |
| 27***00 | Lens; (Amber)(Warning Beacon) | 1 |
| 9R***42 | Plug As | 1 |
194-2732 Lighting Gp-Flood -Cab
| 10***23 | Switch As-Rocker; (Boom Lamp) | 1 |
| 11***18 | Clip | 2 |
| 12***48 | Actuator-Rocker | 1 |
250-0918 Lighting Gp-Roading
| 09***66 | Washer; (Hard) (4.5x9x1mm Thk) | 4 |
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 10***04 | Kit-Receptacle; (4-Pin)(Start Switch) | 1 |
194-2715 Panel & Mtg Gp-Circuit Breaker
| 11***91 | Bracket Assem. | 1 |
| 19***15 | Panel & Mtg Group-Circuit Breaker | 1 |
| 20***02 | Panel Group-Circuit Breaker | 1 |
202-2702 Panel Gp-Circuit Breaker
| 09***66 | Washer; (Hard) (4.5x9x1mm Thk) | 4 |
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 10***05 | Kit-Receptacle; (6-Pin)(Display Monitor Harness) | 1 |
198-0917 Receptacle Gp-Auxiliary Start
| 19***17 | Receptacle Group-Auxiliary Start | 1 |
| 1S***51 | Terminal-Cable; (00-Ga, 1/2-In Screw) | 2 |
| 20***34 | Plate As | 1 |
4p-5820 Sensor Gp-Speed -Engine
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 2 |
| 17***49 | Strap; (Marker) | 1 |
| 18***35 | Pin-Connector; (16-Ga To 18-Ga) | 2 |
7n-0718 Switch Gp-Disconnect -Battery
| 2H***22 | Lockwasher | 2 |
| 6F***45 | Nut-Full; (3/8-24-Thd) | 2 |
| 7N***18 | Switch As-Disconnect; -Battery-Ground Level | 1 |
172-8660 Switch Gp-Liquid Level -Hydraulic Tank
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 17***60 | Switch Group-Liquid Level; -Rear Engine Oil-Ster, Hydraulic Fan Oil-Engine On-Steering Oil, Engine Off-Auxiliary Coolant-Front Engine Oil-Brake Oil, Hoist-Engine Coolant-Tc Oil-Low, Cold | 1 |
| 9X***01 | Pin-Connector; (16-Ga To 18-Ga)(Throttle Position Sensor) | 2 |
175-2309 Switch Gp-Magnetic
| 01***80 | Lockwasher | 2 |
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 11***81 | Switch As-Magnetic; (Start Relay) | 1 |
118-3534 Switch Gp-Magnetic
| 11***34 | Switch Group-Magnetic; -Start Relay | 1 |
| 17***08 | Switch Group-Magnetic; -24-Volt-Start Relay-Main Relay | 1 |
| 17***09 | Switch Group-Magnetic; -24-Volt-Start Relay | 1 |
175-2308 Switch Gp-Magnetic
| 01***80 | Lockwasher | 2 |
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 17***08 | Switch Group-Magnetic; -24-Volt-Start Relay-Main Relay | 1 |
167-0138 Switch Gp-Magnetic -Main Relay
| 15***70 | Kit-Connecting Plug; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 16***38 | Switch Group-Magnetic; -Main Relay-Main Power Relay | 1 |
| 18***36 | Socket-Connector; (16-Ga To 18-Ga) | 2 |
241-8368 Switch Gp-Magnetic -Main Relay
| 15***70 | Kit-Connecting Plug; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 18***36 | Socket-Connector; (16-Ga To 18-Ga) | 2 |
| 24***68 | Switch Group-Magnetic; -Main Power Relay-Main Relay | 1 |
209-5582 Switch Gp-Magnetic
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 18***35 | Pin-Connector; (16-Ga To 18-Ga) | 2 |
| 20***82 | Switch Group-Magnetic; -Starting Aid Heater Relay-Air Inlet Heater Relay | 1 |
254-3783 Switch Gp-Magnetic -Main Relay
| 15***70 | Kit-Connecting Plug; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 18***36 | Socket-Connector; (16-Ga To 18-Ga) | 2 |
| 25***83 | Switch Group-Magnetic; -Main Relay-Main Power Relay | 1 |
165-5970 Switch Gp-Toggle -Reversible Fan
| 10***03 | Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge) | 1 |
| 16***70 | Switch Group-Toggle; -Engine Shutoff-Starting Aid-Diagnostic Mode Select | 1 |
| 18***35 | Pin-Connector; (16-Ga To 18-Ga) | 3 |
244-3607 Wiring Gp-Cab
| 09***28 | Screw; (Machine) (M4x0.7x12mm) | 1 |
| 09***66 | Washer; (Hard) (4.5x9x1mm Thk) | 1 |
| 09***36 | Grommet | 1 |
244-3604 Wiring Gp-Chassis
| 10***01 | Kit; (Receptacle) (12-Pin) (Includes Receptacle As & Wedge) | 1 |
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 3 |
| 10***03 | Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge) | 1 |
244-3609 Wiring Gp-Console
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 10***03 | Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge) | 1 |
| 10***04 | Kit-Receptacle; (4-Pin)(Start Switch) | 1 |
246-3422 Wiring Gp-Engine
| 03***08 | Terminal-Ring | 1 |
| 03***09 | Terminal-Ring; (For 1/4-In Bolt) | 1 |
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 2 |
Engine Arrangement
240-7898 Installation Ar-Engine
| 24***98 | Installation Ar-Engine | 1 |
| 24***99 | Valve Group-Fluid Sampling; -Coolant | 1 |
| 24***00 | Mounting Group-Engine & Xmsn | 1 |
Frame And Body
224-2333 Door Gp-Access -Cab Roof
| 13***02 | Washer-Nylon; (0.53x1.53x0.125-In Thk) | 2 |
| 16***49 | Bolt; (M12x1.75x60-mm) | 4 |
| 21***29 | Block | 2 |
242-3559 Frame & Tank As-Rear -Fuel, Hydraulic
| 19***60 | Tank Group-Hydraulic | 1 |
| 19***61 | Tank Group-Fuel | 1 |
| 19***67 | Plate As | 1 |
242-9580 Frame & Tank Gp-Rear -Fuel, Hydraulic
| 09***45 | Gauge Group-Sight; -Hydraulic Oil Level | 1 |
| 09***47 | Bolt; (M10x1.5x36-mm) | 2 |
| 09***14 | Seal-O-Ring (Id=9.80mm) | 4 |
194-2693 Frame As-Front
| 11***58 | Plate | 1 |
| 11***73 | Stud-Weld; (M12x1.75x21.1-mm) | 8 |
| 19***93 | Frame As-Front | 1 |
258-8115 Guard Gp-Bottom
| 11***54 | Seal; (160-cm) | 0 |
| 20***74 | Guard As; (Lh) | 1 |
| 20***75 | Guard As; (Rh) | 1 |
242-9582 Guard Gp-Front
| 10***53 | Bumper-Conical | 1 |
| 19***85 | Plate | 1 |
| 19***87 | Plate As | 1 |
148-8959 Hitch Gp-Articulating
| 09***07 | Nut; (M12x1.75-Thd) | 1 |
| 11***72 | Cap | 1 |
| 11***73 | Cap | 1 |
243-4703 Hood & Guard Gp
| 09***91 | Pin - Spring | 2 |
| 11***47 | Spring | 2 |
| 14***03 | Grommet | 2 |
194-2698 Link Gp-Steering Frame Lock
| 16***20 | Pin | 1 |
| 19***98 | Link Group-Steering Frame Lock | 1 |
| 19***24 | Pin As | 1 |
253-2655 Roading Ar
| 25***18 | Lighting Group-Roading | 1 |
| 25***21 | Panel Group-Electronic | 1 |
| 25***55 | Roading Ar | 1 |
214-0782 Stop Gp-Steering
| 21***82 | Stop Group-Steering | 1 |
| 21***93 | Block | 2 |
| 21***94 | Block | 2 |
Fuel System
240-7909 Control Gp-Governor
| 12***78 | Locknut; (M6x1-Thd) | 1 |
| 24***09 | Control Group-Governor | 1 |
| 24***38 | Cable As | 1 |
240-7883 Lines Gp-Fuel
| 14***19 | Connector As | 2 |
| 14***53 | Elbow, 45,-6 Orb To-6 Orfs-Drum Clutch Port | 1 |
| 14***78 | Elbow, 90°,-6 Orb /-6 Orfs; (90°) (-6 Orbx-6orfs) | 1 |
196-3861 Tank Gp-Fuel
| 09***30 | Seal-O-Ring (Id=179.30mm) | 1 |
| 15***39 | Plate | 1 |
| 19***61 | Tank Group-Fuel | 1 |
Hydraulic System
170-8531 Accumulator Gp-Pilot Oil -Charged-Dead Engine, Lift Arm Lower
| 17***31 | Accumulator Group-Pilot Oil; -Charged-Dead Engine Lower, Arch, Boom | 1 |
| 20***58 | Film-Warning; (Accumulator)(High Pressure Cylinder) | 2 |
179-9387 Accumulator Gp-Pilot Oil -Uncharged
| 17***87 | Accumulator Group-Pilot Oil; -Uncharged-Dead Engine Lower, Arch, Boom | 1 |
| 20***58 | Film-Warning; (Accumulator)(High Pressure Cylinder) | 2 |
246-3419 Actuator Gp-Pump
| 11***42 | Nut; (M16x1.5-mm-Thd) | 1 |
| 18***31 | Cover | 1 |
| 18***42 | Cover | 1 |
149-7393 Cylinder & Mtg Gp-Steering
| 00***12 | Washer; (0.13-In Thk) | 2 |
| 14***93 | Cylinder & Mtg Group-Steering | 1 |
| 15***03 | Cylinder & Seal Group-Steering | 2 |
152-3503 Cylinder & Seal Gp-Steering
| 15***03 | Cylinder & Seal Group-Steering | 1 |
| 31***40 | Cylinder Group-Steering | 1 |
| 7K***03 | Seal-Lip Facing Away From Bearing | 4 |
215-6715 Cylinder Gp-Lift
| 15***11 | Lockwasher | 12 |
| 16***01 | Seal As-Buffer | 1 |
| 16***12 | Seal-U-Cup | 1 |
139-3312 Cylinder Gp-Steering
| 13***12 | Cylinder Group-Steering | 1 |
| 13***13 | Cylinder Assem. | 1 |
| 13***14 | Rod Assem. | 1 |
314-9340 Cylinder Gp-Steering
| 13***13 | Cylinder Assem. | 1 |
| 13***14 | Rod Assem. | 1 |
| 17***79 | Bolt-Hex Head; (M24x3.0x80mm) | 1 |
224-9878 Cylinder Gp-Tilt
| 16***01 | Seal As-Buffer | 1 |
| 16***12 | Seal-U-Cup | 1 |
| 19***62 | Seal | 1 |
244-3771 Filler Gp-Hydraulic Oil
| 10***90 | Adapter As | 1 |
| 14***47 | Elbow; (-12 Orb/Orfs) | 1 |
| 15***36 | Reducer As | 1 |
118-6656 Filter Gp-Oil -Work Tool
| 11***56 | Filter Group-Oil; -Power Train Charging | 1 |
| 1G***78 | Filter As-Oil; (Advanced Efficiency)(Hydraulic) | 1 |
| 3J***07 | Seal Valve Assembly To; Seal- Tube Assembly To Logic Valve | 1 |
243-6514 Filter Gp-Oil -Hydraulic, Power Train, Wktl
| 11***56 | Filter Group-Oil; -Power Train Charging | 2 |
| 14***31 | Tee Group | 1 |
| 15***28 | Elbow As | 1 |
196-3079 Filter Gp-Oil -Power Train Charge Pump
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 10***36 | Seal-O-Ring; (49.28mm Id) | 1 |
| 12***14 | Filter-Oil; (Ultra High Efficiency) | 1 |
245-8358 Filter Gp-Oil -Work Tool Hydraulic
| 24***58 | Filter Group-Oil; -Work Tool Hydraulic | 1 |
246-3420 Head Gp-Pump
| 08***72 | Plug-O-Ring | 4 |
| 09***05 | Bolt-Socket Head; (M16x2x100-mm) | 4 |
| 11***45 | Seal-O-Ring | 1 |
242-4222 Hydraulic Ar
| 14***93 | Cylinder & Mtg Group-Steering | 1 |
| 19***74 | Lines Group-Tilt Cylinder | 1 |
| 19***75 | Lines Group-Lift Cylinder | 1 |
167-7080 Lever Gp-Control -Hydraulic Lockout
| 09***62 | Washer; (Hard) (3.4x7x0.8mm Thk) | 2 |
| 10***03 | Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge) | 1 |
| 12***27 | Screw-Pan Head; (M3x0.5x16-mm) | 2 |
197-9885 Lever Gp-Control -Hydraulic Lockout
| 16***80 | Lever Group-Control; -Hydraulic Lockout | 1 |
| 17***08 | Cover | 1 |
| 19***85 | Lever Group-Control; -Hydraulic Lockout | 1 |
245-7519 Lines Gp-Coupler
| 14***25 | Connector As. | 1 |
| 14***28 | Connector Assem. | 2 |
| 14***67 | Elbow Group; (Each Includes) | 1 |
241-3289 Lines Gp-Front
| 10***09 | Connector | 1 |
| 14***27 | Connector Group | 4 |
| 15***52 | Connector As | 5 |
242-0668 Lines Gp-Grease
| 11***91 | Bracket Assem. | 2 |
| 14***20 | Connector As | 14 |
| 14***51 | Elbow Group | 1 |
241-0991 Lines Gp-Hydraulic
| 14***67 | Clamp; (Hose) | 4 |
| 14***19 | Connector As | 1 |
| 14***26 | Adapter; (Straight) (-4 Orb X -4 Orfs) | 2 |
194-2675 Lines Gp-Lift Cylinder
| 14***17 | Adapter, -12 Orb / -16 Orfs | 2 |
| 14***59 | Elbow Group | 4 |
| 14***50 | Tee As | 2 |
194-2676 Lines Gp-Pilot
| 06***51 | Clamp | 4 |
| 13***33 | Grommet | 1 |
| 14***36 | Adapter; (Straight) (-6 Orb X -6 Orfs) | 2 |
241-2768 Lines Gp-Return
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 10***65 | Tee As-Swivel | 1 |
| 10***33 | Clip; (Slot) | 2 |
242-1509 Lines Gp-Steering
| 13***11 | Elbow; (Lh) | 1 |
| 13***53 | Elbow; (Rh) | 1 |
| 14***47 | Elbow; (-12 Orb/Orfs) | 2 |
194-2674 Lines Gp-Tilt Cylinder
| 12***67 | Clamp-Hose | 2 |
| 14***17 | Adapter, -12 Orb / -16 Orfs | 2 |
| 14***59 | Elbow Group | 4 |
193-4750 Manifold Gp-Control -Quick Coupler
| 15***25 | Valve Group-Shuttle; (Quick Coupler) | 2 |
| 19***50 | Manifold Group-Control; -Quick Coupler | 1 |
| 20***80 | Manifold As | 1 |
242-9975 Pump & Mtg Gp-Hydraulic
| 09***86 | Bolt; (M12x1.75x55-mm) | 4 |
| 16***92 | Bolt; (M10x1.5x85-mm) | 6 |
| 22***99 | Seal-O-Ring | 1 |
243-0103 Pump Gp-Piston
| 09***95 | Plug | 1 |
| 09***00 | Seal-O-Ring | 1 |
| 11***44 | Rotating Group-Pump | 1 |
196-5960 Pump Gp-Piston -Implement, Pilot, Steering
| 09***70 | Bolt-Socket Hd; (M12 X 1.75 X 45) | 4 |
| 11***49 | Fitting As; (Quick Disconnect) | 2 |
| 19***60 | Pump Group-Piston; -Implement, Pilot, Steering | 1 |
262-4419 Pump Gp-Piston -Implement, Pilot, Steering
| 09***70 | Bolt-Socket Hd; (M12 X 1.75 X 45) | 4 |
| 11***49 | Fitting As; (Quick Disconnect) | 2 |
| 22***88 | Swashplate As | 1 |
118-6244 Rotating Gp-Pump
| 11***44 | Rotating Group-Pump | 1 |
| 12***06 | Swashplate | 1 |
| 12***07 | Lever | 1 |
261-4670 Screen Gp-Hydraulic -Implement Pump Inlet
| 09***24 | Seal-O-Ring | 1 |
| 15***24 | Hex Head Plug; (-4sae) (D6r Iii) | 1 |
| 25***72 | Strainer; (Hydraulic Oil) | 1 |
196-3860 Tank Gp-Hydraulic
| 09***30 | Seal-O-Ring (Id=179.30mm) | 2 |
| 15***39 | Plate | 2 |
| 19***60 | Tank Group-Hydraulic | 1 |
250-3820 Valve & Mtg Gp-Combination -Pilot, Brake, Steering
| 14***15 | Connector As | 2 |
| 14***27 | Connector Group | 1 |
| 14***36 | Adapter; (Straight) (-6 Orb X -6 Orfs) | 10 |
194-2686 Valve & Mtg Gp-Combination -Pilot, Brake, Steering
| 14***15 | Connector As | 2 |
| 14***27 | Connector Group | 1 |
| 14***36 | Adapter; (Straight) (-6 Orb X -6 Orfs) | 10 |
243-6513 Valve & Mtg Gp-Main Control -4-Bank, Saw
| 19***64 | Valve Group-Bank 4; -Main Hydraulic | 1 |
| 24***13 | Valve & Mtg Group-Main Control; -4-Bank, Saw | 1 |
| 8T***21 | Washer-Hard; (11x21x2.5-mm Thk)(M10x1.50x30mm) | 4 |
196-6864 Valve Gp-Bank 4
| 17***83 | Kit-Bracket; (Main Control Valve) | 1 |
| 17***85 | Kit-Seal; (Main Control Valve) | 1 |
| 19***64 | Valve Group-Bank 4; -Main Hydraulic | 1 |
250-3823 Valve Gp-Combination -Pilot, Brake, Steering
| 17***85 | Valve Group-Solenoid | 1 |
| 19***00 | Valve Group-Solenoid; (Front Differential Lock) | 5 |
| 21***96 | Connector | 2 |
197-7156 Valve Gp-Combination -Pilot, Brake, Steering
| 12***33 | Coil As; (24-Volt) | 1 |
| 12***35 | Kit-Seal | 1 |
| 12***72 | Cartridge As | 1 |
218-9834 Valve Gp-Control -Inlet
| 17***04 | Adapter As-Valve | 1 |
| 21***34 | Valve Group-Control; -Inlet | 1 |
| 22***11 | Kit-Seal | 1 |
218-9839 Valve Gp-Control -Lift
| 09***45 | Bolt-Socket Head; (M6x1.00x55mm) | 2 |
| 16***40 | Valve Group-Relief; (Line) | 2 |
| 17***85 | Kit-Seal; (Main Control Valve) | 1 |
218-9838 Valve Gp-Control -Accumulator Arm
| 09***41 | Bolt-Socket Head; (M4x0.7x10-mm) | 2 |
| 09***45 | Bolt-Socket Head; (M6x1.00x55mm) | 2 |
| 12***45 | Seal-O-Ring; (25.3mm Id) | 1 |
219-6467 Valve Gp-Control -Steering
| 13***13 | Bolt-Socket Head; (M6x1x30-mm) | 6 |
| 15***82 | Bolt-Socket Head; (M6x1x40-mm) | 1 |
| 17***70 | Orifice; (0.6mm Id) | 2 |
218-9836 Valve Gp-Control -Grapple Arm
| 09***45 | Bolt-Socket Head; (M6x1.00x55mm) | 2 |
| 16***40 | Valve Group-Relief; (Line) | 2 |
| 17***85 | Kit-Seal; (Main Control Valve) | 1 |
218-9840 Valve Gp-Control -Tilt
| 09***45 | Bolt-Socket Head; (M6x1.00x55mm) | 2 |
| 16***40 | Valve Group-Relief; (Line) | 2 |
| 17***85 | Kit-Seal; (Main Control Valve) | 1 |
219-6133 Valve Gp-Control -End Cover
| 21***33 | Valve Group-Control; -End Cover | 1 |
| 3D***24 | O-Ring - For Oil Drain & Level Plug (Items 3 & 7) | 1 |
| 3J***07 | Seal Valve Assembly To; Seal- Tube Assembly To Logic Valve | 1 |
218-9842 Valve Gp-Control -End Cover
| 17***85 | Kit-Seal; (Main Control Valve) | 1 |
| 18***69 | Plug | 1 |
| 21***42 | Valve Group-Control; -End Cover | 1 |
196-6109 Valve Gp-Pilot -Lh Joystick
| 13***66 | Nut; (M14x2-Thd) | 1 |
| 19***09 | Valve Group-Pilot; -Lh Joystick | 1 |
| 22***73 | Control Group-Handle | 1 |
196-6110 Valve Gp-Pilot -Rh Joystick
| 13***66 | Nut; (M14x2-Thd) | 1 |
| 19***10 | Valve Group-Pilot; -Rh Joystick | 1 |
| 22***74 | Control Group-Handle | 1 |
6e-4392 Valve Gp-Pump Control
| 6E***07 | Locknut-Sealing | 1 |
| 6E***92 | Valve Group-Pressure Compensator; -Pressure Compensator-Steering | 1 |
| 6E***01 | Setscrew-Adjustment | 1 |
272-9658 Valve Gp-Pump Control
| 11***97 | Cover | 1 |
| 14***18 | Gasket | 1 |
| 16***49 | Seal-O-Ring; (12.42mm Id) | 2 |
246-4717 Valve Gp-Pump Control
| 09***42 | Ring-Retaining | 2 |
| 11***37 | Spring; (Outer) | 2 |
| 14***93 | Piston-Stroking | 1 |
6e-4402 Valve Gp-Relief -Charge Pressure
| 16***15 | Retainer-Spring | 1 |
| 18***10 | Screw | 1 |
| 20***42 | Spring | 1 |
171-3685 Valve Gp-Solenoid
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 2 |
| 11***43 | Locknut; (5/16-18-Thd) | 2 |
| 16***71 | Kit-Seal; (Solenoid Valve) | 1 |
3e-9205 Valve Gp-Solenoid
| 10***04 | Kit-Receptacle; (4-Pin)(Start Switch) | 1 |
| 12***48 | Kit-Seal; (Solenoid Valve) | 1 |
| 15***84 | Locknut; (Special) (5/8-18 Thd) | 1 |
152-8346 Valve Gp-Solenoid
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 10***36 | Kit-Seal; (Solenoid Valve) | 1 |
| 11***43 | Locknut; (5/16-18-Thd) | 2 |
Implements
242-9531 Arm & Bearing As
| 24***31 | Arm & Bearing As | 1 |
| 3K***75 | Bearing-Sleeve | 2 |
| 7J***45 | Bearing-Sleeve | 4 |
261-4410 Link Gp-Tilt
| 26***10 | Link Group-Tilt | 1 |
| 26***11 | Link & Bearing As; (Tilt) | 2 |
| 3K***75 | Bearing-Sleeve | 2 |
242-9581 Linkage Gp-Felling Head
| 13***65 | Washer; (13.8x45x3-mm Thk) | 14 |
| 20***94 | Pin As | 6 |
| 20***96 | Pin As | 4 |
Lubrication System
240-7899 Valve Gp-Fluid Sampling -Coolant
| 15***23 | Valve-Sampling; (Engine Coolant) | 1 |
| 15***70 | Cap-Dust; (Engine Coolant) | 1 |
| 24***99 | Valve Group-Fluid Sampling; -Coolant | 1 |
Machine Arrangement
243-4701 Chassis Ar
| 09***45 | Cable; (Lanyard) | 1 |
| 14***59 | Hitch Group-Articulating | 1 |
| 18***48 | Key | 1 |
243-4699 Common Ar
| 24***98 | Installation Ar-Engine | 1 |
| 24***22 | Hydraulic Ar | 1 |
| 24***23 | Operator Ar | 1 |
Operator Station
178-5524 Adjustment Gp-Console
| 09***36 | Screw; (Machine) (M5x0.8x10mm) | 1 |
| 09***15 | Ring-Retaining | 1 |
| 11***26 | Screw; (Pan Head) (10-16x0.63 In) | 1 |
197-4107 Air Conditioner & Mounting Gp
| 18***54 | Filter Element-Cab Air | 1 |
| 19***07 | Air Conditioner & Mounting Group | 1 |
| 19***60 | Air Conditioner Group | 1 |
240-7888 Air Conditioner Ar
| 24***88 | Air Conditioner Ar | 1 |
| 24***89 | Lines Group-Air Conditioner | 1 |
199-3160 Air Conditioner Gp
| 17***62 | Duct | 1 |
| 17***63 | Duct As | 1 |
| 18***09 | Duct | 1 |
194-2707 Cab Gp-Enclosed Rops
| 19***07 | Cab Group-Enclosed Rops | 1 |
| 19***08 | Wiring Group-Cab | 1 |
| 19***09 | Panel Group-Instrument | 1 |
199-3159 Case Gp-Air Conditioner
| 17***29 | Case Group-Heater & Evaporator | 1 |
| 18***19 | Screw-Hex Flange; (M5x2.24x14-mm) | 6 |
| 18***56 | Switch As-Pressure; (Air Conditioner, Low Side) | 1 |
177-6729 Case Gp-Heater & Evaporator
| 03***38 | Clamp | 1 |
| 13***14 | Grommet | 1 |
| 17***87 | Coil As-Heater | 1 |
3e-1906 Compressor Gp-Refrigerant
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 18***39 | Pin-Connector; (14-Ga To 18-Ga)(For 14 Gauge Wire) | 2 |
| 31***18 | Valve As-Pressure Relief; (Refrigerant Compressor) | 1 |
240-7905 Compressor Gp-Refrigerant
| 17***57 | Rod | 1 |
| 24***05 | Compressor Group-Refrigerant | 1 |
| 24***90 | Plate As | 1 |
161-3759 Console Gp-Operator -Lh
| 11***26 | Screw; (Pan Head) (10-16x0.63 In) | 8 |
| 12***35 | Screw; (Truss Head) (M6x1x13mm) | 5 |
| 15***99 | Nut | 8 |
200-8042 Console Gp-Operator
| 16***59 | Console Group-Operator; -Lh | 1 |
| 17***13 | Guard | 2 |
| 17***14 | Support | 2 |
204-6974 Console Gp-Operator -Rh
| 11***26 | Screw; (Pan Head) (10-16x0.63 In) | 5 |
| 12***35 | Screw; (Truss Head) (M6x1x13mm) | 6 |
| 15***99 | Nut | 10 |
196-4116 Control Gp-Hydraulic Pedal -Brake
| 11***26 | Kit-Seal | 1 |
| 19***16 | Control Group-Hydraulic Pedal; -Brake | 1 |
| 21***34 | Valve As | 1 |
194-2714 Control Gp-Pilot Operated Hyd
| 14***77 | Elbow As. | 10 |
| 15***44 | Connector Group | 5 |
| 16***69 | Adapter; (Str Thd (-6) Orfs/0) | 5 |
254-9336 Door Gp-Cab
| 09***55 | Clip | 2 |
| 10***61 | Guard | 1 |
| 10***44 | Latch As-Rotary | 1 |
197-4720 Door Gp-Cab
| 03***72 | Pin-Clevis | 2 |
| 09***55 | Clip | 2 |
| 09***87 | Channel-Trim | 0 |
199-5134 Duct Gp-Air
| 10***67 | Washer-Hard; (7.2x25x2-mm Thk) | 3 |
| 11***27 | Screw-Machine; (M6x1x30-mm) | 3 |
| 19***21 | Duct | 1 |
197-2913 Duct Gp-Cab Air
| 10***91 | Screw; (Flat Head) (No.6-20x0.5in) | 4 |
| 11***17 | Louver As | 1 |
| 11***94 | Hose; (66-cm) | 0 |
213-0235 Handle Gp-Door -Cab
| 09***66 | Washer; (Hard) (4.5x9x1mm Thk) | 2 |
| 21***35 | Handle Group-Door; -Cab | 1 |
| 6V***92 | Screw-Machine; (M4x0.7x25-mm) | 1 |
202-9627 Housing Gp-Air Conditioner -Outlet Air
| 17***12 | Cover | 1 |
| 17***13 | Housing | 1 |
| 17***27 | Actuator | 1 |
199-3156 Housing Gp-Air Conditioner -Inlet Air
| 17***90 | Plate | 1 |
| 17***99 | Gasket | 1 |
| 17***05 | Case; (Bottom) | 1 |
220-8420 Installation Gp-Radio
| 10***55 | Cover-Speaker | 2 |
| 11***19 | Bolt-Socket Head; (M4x0.7x25-mm) | 8 |
| 11***54 | Cover | 1 |
240-7889 Lines Gp-Air Conditioner
| 06***51 | Clamp | 2 |
| 12***59 | Clamp | 2 |
| 17***02 | Receiver Dryer As; (Refrigerant) | 1 |
240-7887 Lines Gp-Cab Heater
| 16***73 | Valve Group-Shutoff | 1 |
| 24***87 | Lines Group-Cab Heater | 1 |
| 3K***60 | Seal Pilot Manifold On; Seal To Boom Check Valve Drain | 1 |
200-6424 Module Gp-Quad Gauge
| 10***05 | Kit-Receptacle; (6-Pin)(Display Monitor Harness) | 1 |
| 20***24 | Module Group-Quad Gauge | 1 |
| 3E***83 | Wedge-Receptacle Lock; (6-Pin) | 1 |
194-2706 Mounting Gp-Cab
| 19***06 | Mounting Group-Cab | 1 |
| 21***53 | Sleeve | 4 |
| 6V***76 | Nut-Lock; (M24 X 3.0) | 4 |
242-4223 Operator Ar
| 16***57 | Support Group-Seat; Support Gp - Seat | 1 |
| 19***05 | Platform Group-Operator | 1 |
| 19***07 | Cab Group-Enclosed Rops | 1 |
251-5821 Panel Gp-Electronic
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 2 |
| 10***03 | Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge) | 2 |
| 10***05 | Kit-Receptacle; (6-Pin)(Display Monitor Harness) | 1 |
244-3608 Panel Gp-Instrument
| 10***66 | Bezel | 2 |
| 11***27 | Screw-Machine; (M6x1x30-mm) | 5 |
| 11***11 | Socket-Auxiliary Power; (12-Volt)(Power Port) | 1 |
194-2705 Platform Gp-Operator
| 19***05 | Platform Group-Operator | 1 |
| 19***53 | Tread | 1 |
| 19***96 | Plate As | 1 |
284-8953 Radio Gp -Am/Fm/Wb/Cd Player
| 14***81 | Knob-Select; (Radio) | 1 |
| 19***54 | Sleeve | 1 |
| 28***53 | Radio Group; -Am/Fm/Wb/Cd Player | 1 |
204-0363 Radio Gp -Am/Fm/Wb Cd Player
| 13***90 | Bushing; (Radio Mount) | 1 |
| 14***81 | Knob-Select; (Radio) | 1 |
| 16***26 | Radio Group; (Am/Fm Cd Player) | 1 |
201-6973 Seat Gp
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 18***35 | Pin-Connector; (16-Ga To 18-Ga) | 2 |
| 20***85 | Suspension Group-Seat; -Air | 1 |
210-7728 Seat Gp-Suspension
| 21***52 | Seat Group | 1 |
| 21***28 | Seat Group-Suspension | 1 |
| 21***02 | Suspension Group-Seat | 1 |
210-7727 Seat Gp-Suspension
| 1A***50 | Bolt (7/16-20x1.75in); (7/16-20x1.75-In) | 2 |
| 21***27 | Seat Group-Suspension | 1 |
| 21***28 | Seat Group-Suspension | 1 |
194-2684 Seat Gp-Suspension
| 19***84 | Seat Group-Suspension | 1 |
| 1A***50 | Bolt (7/16-20x1.75in); (7/16-20x1.75-In) | 2 |
| 20***73 | Seat Group | 1 |
161-3757 Support Gp-Seat
| 16***57 | Support Group-Seat; Support Gp - Seat | 1 |
| 16***43 | Support As; (Seat) | 1 |
| 7X***29 | Washer; (11x25x3-mm Thk) | 4 |
210-8502 Suspension Gp-Seat
| 17***55 | Kit-Seat Adjuster; (Upper) | 1 |
| 17***57 | Kit-Cable Adjuster; (Lower) | 1 |
| 17***58 | Kit-Handle | 2 |
201-5685 Suspension Gp-Seat -Air
| 17***55 | Kit-Seat Adjuster; (Upper) | 1 |
| 17***57 | Kit-Cable Adjuster; (Lower) | 1 |
| 17***58 | Kit-Handle | 2 |
198-3890 Trim Gp-Cab
| 09***35 | Screw; (Machine) (M5x0.8x8mm) | 2 |
| 10***39 | Support-Filter | 1 |
| 12***08 | Bracket As | 1 |
194-2711 Window Gp-Cab
| 19***11 | Window Group-Cab | 1 |
| 19***92 | Window Group-Cab; -Lh | 1 |
| 19***21 | Window-Rh | 1 |
212-3310 Window Gp-Cab
| 13***30 | Hinge-Lh | 2 |
| 15***15 | Gasket | 1 |
| 21***25 | Glass; (Fixed, Lower) | 1 |
196-2392 Window Gp-Cab -Lh
| 13***30 | Hinge-Lh | 2 |
| 15***15 | Gasket | 1 |
| 19***87 | Frame As-Lower | 1 |
Power Train
213-8773 Accumulator Gp-Brake -Charged
| 1J***71 | Seal (10.52 Degrees I.D.); Seal-O-Ring -- To Adapter | 1 |
| 21***73 | Accumulator Group-Brake; -Charged | 1 |
| 22***32 | Cap; (Gas Valve) | 1 |
223-3917 Accumulator Gp-Brake -Uncharged
| 1J***71 | Seal (10.52 Degrees I.D.); Seal-O-Ring -- To Adapter | 1 |
| 22***17 | Accumulator Group-Brake; -Uncharged-Front | 1 |
| 22***32 | Cap; (Gas Valve) | 1 |
213-4602 Axle Ar
| 13***15 | Axle Ar-Fixed; -Rear | 1 |
| 14***69 | Stud | 80 |
| 20***93 | Axle Ar-Oscillating; -Front | 1 |
214-0625 Axle Ar
| 19***32 | Axle Ar-Oscillating; -Front | 1 |
| 20***25 | Axle Ar-Fixed; -Rear | 1 |
| 20***49 | Mounting Group-Rim | 1 |
204-5725 Axle Ar-Fixed -Rear
| 13***19 | Brake & Planetary Group | 2 |
| 13***83 | Gear Group-Bevel & Pinion | 1 |
| 18***87 | Differential Group; -Locking | 1 |
139-4115 Axle Ar-Fixed -Rear
| 13***15 | Axle Ar-Fixed; -Rear | 1 |
| 13***21 | Housing Group-Fixed Axle | 1 |
| 13***26 | Brake & Planetary Group | 2 |
209-9293 Axle Ar-Oscillating -Front
| 13***83 | Gear Group-Bevel & Pinion | 1 |
| 18***87 | Differential Group; -Locking | 1 |
| 20***93 | Axle Ar-Oscillating; -Front | 1 |
194-1532 Axle Ar-Oscillating -Front
| 13***83 | Gear Group-Bevel & Pinion | 1 |
| 18***87 | Differential Group; -Locking | 1 |
| 19***32 | Axle Ar-Oscillating; -Front | 1 |
139-4126 Brake & Planetary Gp
| 13***52 | Dowel | 4 |
| 13***45 | Pin-Spring | 3 |
| 13***26 | Brake & Planetary Group | 1 |
139-4119 Brake & Planetary Gp
| 13***52 | Dowel | 4 |
| 13***45 | Pin-Spring | 3 |
| 13***19 | Brake & Planetary Group | 1 |
261-8106 Control Gp-Parking Brake
| 06***51 | Clamp | 2 |
| 14***61 | Elbow Group | 1 |
| 21***55 | Hose As | 1 |
194-2682 Control Gp-Service Brake
| 09***63 | Grommet | 1 |
| 14***36 | Adapter; (Straight) (-6 Orb X -6 Orfs) | 2 |
| 14***67 | Elbow Group; (Each Includes) | 1 |
225-6855 Conversion Gp-Brake Lines
| 14***67 | Elbow Group; (Each Includes) | 2 |
| 14***58 | Union, 90 Deg -6 | 2 |
| 15***27 | Tee Group; (Each Includes) | 2 |
184-3587 Differential Gp -Locking
| 12***60 | Screw-Flat Head; (M6x1x16-mm) | 8 |
| 12***42 | Washer-Thrust | 1 |
| 13***28 | Gear-Bevel; (Differential Lock, 16-Teeth) | 1 |
110-0924 Drive Gp-Flexible Coupling
| 11***24 | Drive Group-Flexible Coupling | 1 |
| 11***71 | Driver | 1 |
| 4B***44 | Rivet | 5 |
240-8304 Drive Gp-Pump
| 16***77 | Plug As | 1 |
| 18***51 | Gear; (70-Teeth) | 1 |
| 18***25 | Ring | 1 |
243-0785 Drive Gp-Pump
| 15***65 | Elbow; (Spl) | 1 |
| 15***46 | Adapter Group | 1 |
| 16***62 | Connector Assembly | 1 |
196-4558 Filter Gp-Oil -Main Hydraulic
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 18***35 | Pin-Connector; (16-Ga To 18-Ga) | 2 |
| 19***58 | Filter Group-Oil; -Main Hydraulic | 1 |
214-6594 Filter Gp-Oil -Hyd, Power Train Case Drain
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 18***35 | Pin-Connector; (16-Ga To 18-Ga) | 2 |
| 21***94 | Filter Group-Oil; -Hydraulic, Power Train Case Drain | 1 |
139-4183 Gear Gp-Bevel & Pinion
| 03***60 | Cup-Roller Bearing | 1 |
| 03***61 | Cone-Roller Bearing | 1 |
| 11***84 | Sleeve As | 1 |
204-5726 Housing Gp-Fixed Axle
| 09***04 | Bolt-Socket Head; (M12x1.75x110-mm) | 4 |
| 12***03 | Seal-Lip Type; (7602mm Id) | 1 |
| 14***29 | Retainer-Seal | 1 |
139-4121 Housing Gp-Fixed Axle
| 09***04 | Bolt-Socket Head; (M12x1.75x110-mm) | 4 |
| 12***03 | Seal-Lip Type; (7602mm Id) | 1 |
| 13***21 | Housing Group-Fixed Axle | 1 |
194-1533 Housing Gp-Oscillating Axle
| 09***04 | Bolt-Socket Head; (M12x1.75x110-mm) | 4 |
| 10***31 | Plate | 1 |
| 12***03 | Seal-Lip Type; (7602mm Id) | 1 |
209-9294 Housing Gp-Oscillating Axle
| 09***04 | Bolt-Socket Head; (M12x1.75x110-mm) | 4 |
| 10***31 | Plate | 1 |
| 12***03 | Seal-Lip Type; (7602mm Id) | 1 |
244-0524 Lines Gp-Charge Pressure
| 13***02 | Hose As | 1 |
| 14***05 | Adapter Group | 1 |
| 14***27 | Connector Group | 1 |
261-1290 Lines Gp-Differential Lock
| 14***36 | Adapter; (Straight) (-6 Orb X -6 Orfs) | 1 |
| 14***53 | Elbow, 45,-6 Orb To-6 Orfs-Drum Clutch Port | 1 |
| 14***77 | Elbow As. | 1 |
241-6972 Lines Gp-Hydrostatic
| 12***88 | Flange-Split | 4 |
| 18***47 | Coupler As-Quick Disconnect | 4 |
| 18***08 | Cap-Dust | 4 |
241-9746 Lines Gp-Speed Control -Power Train
| 06***51 | Clamp | 5 |
| 14***36 | Adapter; (Straight) (-6 Orb X -6 Orfs) | 4 |
| 14***67 | Elbow Group; (Each Includes) | 3 |
194-2723 Motor & Mtg Gp-Propel
| 19***23 | Motor & Mtg Group-Propel | 1 |
| 19***08 | Motor Group-Piston; -Propel | 1 |
| 7X***66 | Capscrew; (Hex Hd) (3/4-10x2 Gd 8 Z) (Current Adapters) | 4 |
196-6808 Motor Gp-Piston -Propel
| 10***85 | Bolt-Socket Head; (M12x1.75x60-mm) | 2 |
| 10***87 | Bolt; (Hex Socket) (M6x1.0x20.0mm) | 4 |
| 10***81 | Bolt; (Socket Head) (M12x1.75x35mm) | 2 |
194-9447 Mounting Gp-Axle
| 19***47 | Mounting Group-Axle | 1 |
| 7X***67 | Bolt-Plt; (M24 X 3.0 X 160) | 8 |
| 7X***79 | Bolt; (M24x3x240-mm) | 8 |
204-9249 Mounting Gp-Rim
| 14***69 | Stud | 64 |
| 20***49 | Mounting Group-Rim | 1 |
| 2J***05 | Nut Rim To Adapter And Adapter To Wheel | 64 |
209-9298 Planetary Gp-Final Drive
| 13***52 | Dowel | 4 |
| 13***45 | Pin-Spring | 3 |
| 13***30 | Gear-Sun; (15-Teeth) | 1 |
195-5930 Planetary Gp-Final Drive
| 13***52 | Dowel | 4 |
| 13***45 | Pin-Spring | 3 |
| 13***29 | Carrier-Planetary | 1 |
243-0708 Power Train Ar
| 11***24 | Drive Group-Flexible Coupling | 1 |
| 19***21 | Transmission & Mounting Group | 1 |
| 19***22 | Pump & Mtg Group-Propel | 1 |
194-2722 Pump & Mtg Gp-Propel
| 14***92 | Elbow; (-12 Orfs/-12 Orfs Swivel) | 1 |
| 15***33 | Tee As | 1 |
| 19***22 | Pump & Mtg Group-Propel | 1 |
243-4904 Pump Gp-Piston -Propel
| 03***05 | Seal-O-Ring | 2 |
| 09***40 | Ring; (Retaining) | 1 |
| 10***79 | Seal-O-Ring | 2 |
206-2575 Shaft Gp-Drive
| 02***08 | Screw; (3/8-24) | 1 |
| 19***66 | Setscrew | 1 |
| 20***75 | Shaft Group-Drive | 1 |
194-2727 Shaft Gp-Drive
| 19***27 | Shaft Group-Drive | 1 |
| 20***75 | Shaft Group-Drive | 1 |
| 21***46 | Spider & Bearing As | 2 |
229-1639 Tire & Rim Ar
| 22***38 | Tire & Rim Group | 4 |
| 22***39 | Tire & Rim Ar | 1 |
131-9189 Tire & Rim Ar
| 13***82 | Tire & Rim Group | 4 |
| 13***89 | Tire & Rim Ar | 1 |
205-7342 Tire & Rim Ar
| 20***41 | Tire & Rim Group | 4 |
| 20***42 | Tire & Rim Ar | 1 |
137-9837 Tire & Rim Ar
| 13***16 | Tire & Rim Group | 4 |
| 13***37 | Tire & Rim Ar | 1 |
194-2733 Tire & Rim Ar
| 13***15 | Tire & Rim Ar | 1 |
| 19***33 | Tire & Rim Ar | 1 |
| 21***93 | Block | 2 |
214-0740 Tire & Rim Ar
| 20***08 | Tire & Rim Group | 2 |
| 20***41 | Tire & Rim Group | 2 |
| 21***40 | Tire & Rim Ar | 1 |
132-0115 Tire & Rim Ar
| 13***15 | Tire & Rim Ar | 1 |
| 13***17 | Tire & Rim Group | 4 |
229-1638 Tire & Rim Gp
| 13***60 | Tire & Tube Group; (28-26) | 1 |
| 22***37 | Rim As | 1 |
| 22***38 | Tire & Rim Group | 1 |
131-9182 Tire & Rim Gp
| 13***60 | Tire & Tube Group; (28-26) | 1 |
| 13***82 | Tire & Rim Group | 1 |
| 15***49 | Rim As | 1 |
132-0117 Tire & Rim Gp
| 13***75 | Rim As | 1 |
| 13***80 | Tire & Tube Group; (30.5-32) | 1 |
| 13***17 | Tire & Rim Group | 1 |
137-9816 Tire & Rim Gp
| 13***33 | Tire & Tube Group; (28l-26) | 1 |
| 13***16 | Tire & Rim Group | 1 |
| 15***49 | Rim As | 1 |
205-7341 Tire & Rim Gp
| 13***80 | Tire & Tube Group; (30.5-32) | 1 |
| 20***06 | Rim As; (27x32) | 1 |
| 20***41 | Tire & Rim Group | 1 |
204-5308 Tire & Rim Gp
| 14***62 | Tire; (35.5-32) | 1 |
| 20***08 | Tire & Rim Group | 1 |
| 23***39 | Rim As; (27x32) | 1 |
194-2721 Transmission & Mounting Gp
| 12***91 | Elbow | 1 |
| 14***17 | Adapter, -12 Orb / -16 Orfs | 1 |
| 14***95 | Plug As | 1 |
194-4241 Transmission Gp -Gearbox
| 11***19 | Plug-Magnetic; (Engine Oil Pan Drain) | 1 |
| 19***41 | Transmission Group; -Gearbox | 1 |
| 1D***58 | Pin | 2 |
243-4906 Valve Gp-Pump Control -Propel
| 09***01 | Bolt-Socket Head; (M8x1.25x40-mm) | 2 |
| 11***66 | Seal-O-Ring | 1 |
| 17***39 | Bolt-Socket Head; (M8x1.25x30-mm) | 4 |
Service Equipment And Supplies
242-3647 Film Gp
| 24***92 | Film-Stripe; (Rh) | 1 |
| 24***98 | Film-Identification; (Hydraulic-Ax) | 2 |
| 24***99 | Film; (Flag) | 2 |
249-6625 Lines Gp-Pressurized Water
| 00***53 | Elbow-Pipe; (1/2-14 Nptf Thd) | 1 |
| 14***36 | Adapter; (Straight) (-6 Orb X -6 Orfs) | 1 |
| 14***47 | Elbow; (-12 Orb/Orfs) | 1 |
243-4702 Plate & Film Gp
| 10***30 | Film; (Warning) (Accumulator Pressure) (On Bracket Covering Brake Accumulator) | 1 |
| 11***93 | Plate; (Instruction) (On Right Side Behind Cab Door) | 1 |
| 11***42 | Film-Warning; (Battery/Jump Start) | 2 |
Work Tools
251-7666 Control Gp-Winch
| 09***65 | Grommet | 1 |
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 14***15 | Connector As | 4 |
242-9262 Coupler Gp-Quick
| 10***49 | Plate | 1 |
| 12***77 | Hose As | 1 |
| 12***78 | Hose As | 1 |
249-6568 Guard Gp-Winch
| 24***68 | Guard Group-Winch | 1 |
| 24***69 | Plate As | 1 |
| 24***70 | Plate As | 1 |
245-8703 Head Ar-Harvester
| 24***03 | Head Ar-Harvester | 1 |
245-8701 Head Gp-Mulching
| 24***01 | Head Group-Mulching | 1 |
203-3242 Tooth Gp-Saw -18-Teeth, Super Carbide
| 20***42 | Tooth Group-Saw; -18-Teeth, Super Carbide | 1 |
199-3716 Tooth Gp-Saw -18-Teeth, Beaver
| 19***16 | Tooth Group-Saw; -18-Teeth, Beaver | 1 |
252-9164 Winch Ar
| 24***67 | Winch Group | 1 |
| 25***20 | Valve & Mtg Group-Combination; -Pilot, Brake, Steering | 1 |
| 25***21 | Panel Group-Electronic | 1 |
249-6567 Winch Gp
| 24***81 | Plate As | 1 |
| 24***67 | Winch Group | 1 |
| 24***71 | Winch As | 1 |
Frequently asked questions
What engine does the Caterpillar HA771 use?
Factory literature for the exact HA771 nameplate does not publish an engine model or power rating. It comes from the same generation and chassis platform as the Cat 533/543 wheel feller bunchers that followed, which ran a Cat 3126 or 3126B diesel, and later C-series machines in this class moved to the C6.6 ACERT engine. Confirm the actual engine fitted to a specific HA771 unit from its own engine data plate or a serial-number lookup.
What is the operating weight of the Caterpillar HA771?
An operating weight for the HA771 specifically has not surfaced in factory or third-party spec sheets. Wheel feller bunchers of this size and era generally sit in the low-to-mid teens of metric tons unloaded, before the felling head is mounted, though the figure varies with axle spec, tire size, and the head fitted. Get a scale weight or check the machine's own data plate for an exact number on a given unit.
What replaced the Caterpillar HA771?
Caterpillar carried the chassis forward into its own model numbers. The 533 and 543 wheel feller bunchers share axle, final-drive, and wet-disc brake components with the HA770/HA771/HA870/HA871 line and represent the next generation on the same platform. Those were followed by the C-series 553C, 563C, and 573C wheel feller bunchers, which moved to the C6.6 ACERT engine for current emissions compliance.
What HA771 owners discuss
What do operators say about the HA771's hydrostatic propulsion behavior?
On this class of wheel feller buncher, the propel pedal only responds once engine speed is brought up. At idle the machine can feel dead or only creep even with the pedal near the floor, which catches operators used to loader-type controls off guard. A second reported pattern: forward or reverse drive fades or drops out once hydraulic oil is hot, especially right after hitting a bump or unloading a stem from the head, then returns once engine rpm is backed off and the pedal is reworked. That points to a marginal charge pump, a worn drive motor, or a loose propel linkage or switch rather than a one-off glitch, and a hot-oil drive test (not just a cold check) is standard shop practice on this machine type. Have your dealer verify hydrostatic charge pressure before returning the machine to full duty.
Why would the felling head spin slow while the rest of the hydraulics work fine?
The head circuit runs off its own flow path, either a flow divider or a dedicated motor and relief, separate from steering, boom, and propel. A slow head with everything else normal points mechanics first at the head side: a worn head motor, a relief valve that has crept low, or a partly restricted flow divider. Main pump wear or a suction-side restriction would normally show up as a broader loss of power across every function, not just the saw or shear head. This split-circuit troubleshooting logic is standard shop talk across this class of wheel feller buncher, including the HA771.
What undercarriage and brake wear is typical for the HA771 and machines like it?
This carrier runs an oscillating front axle and fixed rear axle with planetary final drives and wet-disc service brakes. The felling duty cycle (slow travel, constant direction changes, heavy shock loading when the head grabs and cuts a stem) is harder on the front-axle pivot pins and bushings and on the king-pins than typical wheel-loader yard work. Owners and shop mechanics watch for pivot play, axle-housing oil that shows metal or discoloration, and brake fade or a hot-brake smell after a normal shift, since the wet discs run hotter in felling duty than in loader duty. Routine axle oil sampling and a pivot-play check are treated as standard maintenance on this machine type, not extras. Have your dealer verify brake and axle-pivot condition before heavy use.
What engine does the HA771 use, and what quirks come with it?
Cat's HA-series (HA770, HA771, HA870, HA871) grew out of the Hydro-Ax forestry line after Caterpillar took it over, and parts cross-reference ties the HA771's driveline and brake hardware to the same-era wheel forestry lineup built around Cat's mid-range 3126-family diesel (the 533/543 and TK370/TK380 buncher family share the same parts book). That points to a Cat 3126-family engine as the common fit for production HA771 units, though the exact rating, and whether a given machine still carries its original engine, depends on serial range and rebuild history. Confirm against the engine data plate rather than assume. Engines in that family are generally known for injector O-ring weeping over time and for wiring-harness connectors corroding in wet forestry environments, which can cause an intermittent power cut or a false derate rather than a real mechanical fault.
What electrical or sensor problems come up on this machine?
Most reported electrical trouble on this class of machine traces back to the environment more than the components. Harness connectors and ground points corrode from constant exposure to mud, water, and bark debris, showing up as intermittent power loss, a flickering gauge cluster, or an engine derate that clears once the connector is cleaned and dielectric-greased. Felling-head sensor and control-switch wiring at the boom-to-head interface takes the most abuse since it flexes constantly and gets struck by debris during felling. A worn or corroded ground strap between engine and frame is a common root cause worth checking before chasing a fault code on the engine controller.
What should you check when buying a used HA771?
Check felling head condition against the hour meter. A head that looks far more worn, or suspiciously too clean, for the stated hours is a common red flag on this equipment type. Test the hydrostatic drive at full operating temperature, not just cold, since heat-related drive fade will not show up on a short cold test. Check front-axle pivot and king-pin play, wet-disc brake feel and evenness side to side, and pull an axle oil sample if records allow. Inspect flotation tire and rim condition closely, since replacement sizes for this class of carrier are less common and can be costly. Ask for engine and driveline service records and confirm the engine data plate matches what the parts book expects for that serial range, since a rebuilt or swapped engine is not unusual on a machine this old. Have your dealer verify hydrostatic drive and brake system condition before purchase.
Is there much owner discussion specifically about the HA771 online?
Very little discussion names the HA771 directly. It was a low-volume, Hydro-Ax-heritage forestry carrier sold mainly into commercial logging fleets rather than a machine type with a hobbyist following, so dedicated write-ups are scarce. What is confirmed is that the HA771 shares axle, brake, and driveline hardware with its HA770, HA870, and HA871 siblings and with the era's 533/543 and TK370/TK380 wheel forestry line, so most of what applies to that broader Cat wheel feller buncher class (hydrostatic drive behavior, axle and brake wear, mid-range diesel quirks) applies here too. Anything specific to an individual HA771's own history is best confirmed with service records and a dealer inspection rather than assumed from general chatter about the class.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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