Caterpillar HH45
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar HH45 is a hydraulically driven, single-grip harvester head attachment, not a self-propelled machine. It has no engine, fuel system, or cooling system of its own and draws all of its power from the host carrier's hydraulic system, with no independent hydraulic reservoir. It mounts via a hydraulic rotator bolted to its upper yoke (a six-bolt, thread-locked joint torqued to roughly 240 +/- 40 N*m / 177 +/- 30 lb ft) onto either a purpose-built wheel or track harvester base machine or a hydraulic excavator boom. Within Caterpillar's own HH-series lineup (HH45/HH55/HH65/HH75), the HH45 is the lightest head, positioned for thinning-class work on smaller carriers. Two control-system generations exist: earlier production, carrying serial prefix 2JZ, used a third-party DASA electronic measuring-and-control system; later production, carrying serial prefix CFE, moved to Caterpillar's own CABS control, offered as a single control-station Cabswin unit or a dual control-station Cabsdos unit, with keypad entry and a printer for bucking data.
The move from DASA to CABS replaced a bought-in Swedish measuring-and-control system with Caterpillar's own electronics, folding bucking and length/diameter measurement into a control package built and supported by Cat rather than a third-party supplier. For buyers and shops working the used and parts market today, that split still matters: CFE/CABS heads are the newer, better-supported control generation, while 2JZ/DASA heads may mean sourcing control components outside Cat channels. As the entry-weight head in its family, the HH45 sees high duty cycles on its feed rollers, delimbing knives, and saw chain in thinning work, so wear there shows up faster than on larger heads in the same lineup. A used-HH45 check should always start with confirming which control generation is fitted, since that drives both diagnostic approach and parts sourcing going forward.
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.
HH45 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Chain/bar lubrication tank (saw chain oil) | Exact fill figure not published in available documentation for this model - small onboard reservoir sized for a shift's cutting; verify fill level against the sight gauge/dipstick on the head or with your dealer | Cat-approved bar and chain oil selected by ambient temperature - lighter-viscosity oil for cold-weather operation so it flows to the bar and chain on startup, heavier tacky oil in warm weather for better film retention at the cutting chain; use a biodegradable chain oil where required by local environmental regulation. Feed rate is fixed (non-adjustable) and increases automatically as the saw bar extends. |
| Grease points - feed roller arm pivots, holding arm pivot/cylinder pins, delimb knife pins, rotator bearing | No capacity - serviced as individual grease points with a grease gun, not a filled reservoir | Cat multipurpose NLGI 2 grease (moly-fortified type for pin-and-bushing joints) at all pivot pins, cylinder pins, bearings and the rotator. Note: on the HH45 (unlike the HH55/HH65/HH75), the feed roller arm pivots are not fed by the pressurized chain-oil pump, so they rely on scheduled hand-greasing. |
| Hydraulic system (head) | None - the head has no independent hydraulic reservoir | Runs entirely on the host carrier's (harvester base machine or excavator) hydraulic system and tank; follow the carrier's own hydraulic oil specification, not a head-specific one. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar HH45 maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the HH45 beyond the schedule
Predictive maintenance & fluid analysis
The head carries no oil of its own beyond the small chain-lubrication tank, so predictive work centers on trends rather than a sump sample. Track chain-oil consumption rate over time; a rising rate points to saw motor or lube-pump wear before it fails outright. Watch carrier hydraulic filter condition and case-drain temperature for early signs of rotator or cylinder seal wear. Log feed roller and delimb knife wear photographically each service, and flag measuring-arm diameter drift early, since it usually traces back to worn feed rollers rather than the sensor itself.
Corrective & common repairs
Most repairs on the HH45 trace to high-cycle wear parts: feed roller spikes and teeth going flat or missing, delimb knife edges chipping, and saw bar rails or the nose sprocket wearing out of spec. Chain stretch and broken links are routine consumables. A weeping rotator shaft seal often traces back to the directional control valve or relief pressure setting on the carrier, not the seal itself, so check hydraulics before pulling the rotator. Hose chafe at pivot points is a recurring failure point given the head runs entirely off carrier hydraulics.
Overhaul & rebuild points
Plan rebuilds around the rotator bearing and seal, feed roller arm cylinders, and delimb knife cylinders, all of which see continuous cycling in service. Reseal cylinders at the first sign of internal leakage rather than waiting for external weep. On reassembly, retorque the yoke-to-rotator bolts to 240 +/- 40 N*m (177 +/- 30 lb ft) with fresh thread-locking compound. Any major rebuild should end with a full control-system recalibration, potentiometer settings on DASA-generation heads or keypad/printer checks on CABS heads, since disturbed linkages shift measuring accuracy.
Seasonal & environment servicing
Switch to a lighter-viscosity bar and chain oil for cold-weather starts and a heavier, tackier oil in warm weather; the feed rate is fixed and rises automatically as the bar extends, so oil choice is the main seasonal adjustment. Cold, frozen wood changes how far the measuring wheel spikes penetrate versus unfrozen stems, so recheck calibration when conditions swing. In hot, sap-heavy conditions, clean the measuring arm, knives, and rollers more often to stop pitch buildup from masking wear and skewing sensor readings, and watch rotator seal life under sustained high-heat duty cycles.
HH45 attachments & work tools
Host carrier / base machine compatibility
The HH45 works as a dangle head on two factory-supported carrier types: purpose-built wheel (track) harvesters and hydraulic excavators. Cat's own service documentation carries separate hydraulic test-and-adjust procedures for a "Wheel Harvester" configuration and an "Excavator" configuration, so both are factory setups, not field conversions. As the lightest head in its own family line (HH45/HH55/HH65/HH75), it is positioned for thinning work on smaller-class carriers; an exact carrier weight class is not published for the HH45, so match carrier hydraulic flow and pressure to the head with your dealer before fitting.
Rotator and mounting interface
The head hangs from the carrier's boom or dangle link through a hydraulic rotator that gives continuous rotation. The rotator bolts to the head's upper yoke with a six-bolt pattern and thread-locking compound, torqued to 240 ± 40 N·m (177 ± 30 lb ft). A revised rotator design, improving the rotator-to-yoke joint, became effective on HH45 units from serial number CFE211-UP; earlier-built heads used the original rotator. There is no quick-attach coupler on this head — the bolted yoke/rotator joint is the mounting interface to the carrier linkage.
Saw bar and chain
The HH45 fells and bucks with a hydraulically driven bar-and-chain saw. Exact bar length and chain pitch/gauge specific to the HH45 are not documented in public spec sheets — this varies by dealer setup. Across the wider HH-series, harvester saw chain runs from .404 in pitch on the lighter heads up to 3/4 in (.750 in) pitch sprocket-nose bars on the larger heads. Confirm the exact bar/chain spec against the head's serial-specific parts book or with your dealer.
Control-cab / CABS variants
CABS-equipped HH45 units add a computer-aided bucking system with a length/diameter measuring computer and its own on/off switch. Two electrical control-head variants are documented for these units: Cabswin (single control-station wiring) and Cabsdos (dual control-station wiring), each carried as its own electrical control group. Non-CABS HH45 electrical systems used a separate base control, offered in separate English- and German-language versions for export builds.
All HH45 assemblies by section
Every catalogued assembly group for the Caterpillar HH45. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Electrical And Starting System
196-4825 Control Ar-Harvester Head -Cabswin
| 19***25 | Control Ar-Harvester Head; -Cabswin | 1 |
| 19***27 | Control Group-Harvester Head | 1 |
| 19***30 | Wiring Group-Harvester Head | 1 |
196-4826 Control Ar-Harvester Head -Cabsdos
| 19***26 | Control Ar-Harvester Head; -Cabsdos | 1 |
| 19***28 | Control Group-Harvester Head | 1 |
| 19***30 | Wiring Group-Harvester Head | 1 |
196-4822 Control Ar-Harvester Head
| 19***79 | Control Group-Harvester Head | 1 |
| 19***22 | Control Ar-Harvester Head | 1 |
| 19***24 | Wiring Group-Harvester Head | 1 |
196-4827 Control Gp-Harvester Head
| 18***01 | Plate As | 1 |
| 19***19 | Box-Control Unit | 1 |
| 19***27 | Keyboard As | 1 |
196-4828 Control Gp-Harvester Head
| 16***25 | Printer Group-Computer | 1 |
| 19***19 | Box-Control Unit | 1 |
| 19***33 | Harness As-Wiring; (Boom) | 1 |
196-1279 Control Gp-Harvester Head
| 19***79 | Control Group-Harvester Head | 1 |
| 19***11 | Harness As-Monitor; (Control Unit) | 1 |
| 19***12 | Harness As-Monitor; (Analog Output Box) | 1 |
198-1402 Module Gp-Monitor Keypad -Rh
| 09***78 | Screw; (Pan Head) | 2 |
| 19***69 | Cover-Front | 1 |
| 19***70 | Cover-Back | 1 |
198-1403 Module Gp-Monitor Keypad
| 09***78 | Screw; (Pan Head) | 2 |
| 19***69 | Cover-Front | 1 |
| 19***70 | Cover-Back | 1 |
198-3434 Printer Gp-Computer
| 19***34 | Printer Group-Computer | 1 |
| 19***35 | Printer Group-Portable | 1 |
| 19***52 | Case-Carrying | 1 |
161-5225 Printer Gp-Computer
| 16***25 | Printer Group-Computer | 1 |
| 17***46 | Paper-Printer | 1 |
196-4824 Wiring Gp-Harvester Head
| 10***03 | Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge) | 2 |
| 13***75 | Wedge-Receptacle Lock | 1 |
| 14***94 | Guard; (15-cm) | 0 |
196-4830 Wiring Gp-Harvester Head
| 16***85 | Washer | 2 |
| 16***18 | Bracket; (Keypad) | 4 |
| 16***66 | Handle | 2 |
Hydraulic System
194-6602 Bearing Gp-Self-Aligning
| 18***24 | Support-Bearing | 1 |
| 18***25 | Ring-Seal | 1 |
| 18***26 | Bearing | 1 |
184-6523 Bearing Gp-Self-Aligning
| 18***23 | Bearing Group-Self-Aligning | 1 |
| 18***24 | Support-Bearing | 1 |
| 18***25 | Ring-Seal | 1 |
199-6368 Cover & Mtg Gp-Control Valve
| 15***91 | Spacer | 2 |
| 15***92 | Spacer | 2 |
| 15***99 | Bracket | 1 |
195-9361 Cylinder & Lines Gp-Delimbing
| 15***85 | Fitting-Adapter | 6 |
| 15***95 | Fitting-Elbow | 2 |
| 15***97 | Hose As | 2 |
195-9360 Cylinder & Lines Gp-Meas & Fdg
| 15***86 | Fitting | 1 |
| 15***95 | Fitting-Elbow | 2 |
| 15***22 | Hose As | 1 |
195-9359 Cylinder & Lines Gp-Saw
| 15***93 | Fitting-Banjo | 1 |
| 15***95 | Fitting-Elbow | 2 |
| 15***98 | Junction Block | 1 |
158-0403 Cylinder Gp-Delimbing Knife
| 15***03 | Cylinder Group-Delimbing Knife | 1 |
| 16***42 | Bearing | 2 |
| 16***55 | Kit-Seal | 1 |
228-3395 Cylinder Gp-Delimbing Knife
| 16***42 | Bearing | 2 |
| 21***83 | Kit-Seal; (Delimbing Knife Cylinder) | 1 |
| 22***21 | Piston | 1 |
209-5725 Cylinder Gp-Delimbing Knife
| 16***42 | Bearing | 2 |
| 20***25 | Cylinder Group-Delimbing Knife | 1 |
| 21***83 | Kit-Seal; (Delimbing Knife Cylinder) | 1 |
209-5727 Cylinder Gp-Feed Roller Arm
| 16***45 | Bearing | 2 |
| 20***27 | Cylinder Group-Feed Roller Arm | 1 |
| 22***07 | Kit-Seal | 1 |
158-0259 Cylinder Gp-Feed Roller Arm
| 15***59 | Cylinder Group-Feed Roller Arm | 1 |
| 16***45 | Bearing | 2 |
| 16***23 | Kit-Seal | 1 |
209-5726 Cylinder Gp-Holding Arm
| 16***41 | Bearing | 2 |
| 20***26 | Cylinder Group-Holding Arm | 1 |
| 22***25 | Piston | 1 |
158-0404 Cylinder Gp-Holding Arm
| 15***04 | Cylinder Group-Holding Arm | 1 |
| 16***41 | Bearing | 2 |
| 16***56 | Kit-Seal | 1 |
206-4594 Cylinder Gp-Measuring Arm
| 09***52 | Ring | 2 |
| 16***42 | Bearing | 2 |
| 20***94 | Cylinder Group-Measuring Arm | 1 |
156-3852 Cylinder Gp-Measuring Arm
| 15***52 | Cylinder Group-Measuring Arm | 1 |
| 16***42 | Bearing | 2 |
| 16***50 | Kit-Seal | 1 |
184-6511 Cylinder Gp-Piston
| 18***11 | Cylinder Group-Piston | 1 |
| 18***12 | Piston Group | 8 |
| 18***13 | Kit-Retainer | 8 |
228-3397 Cylinder Gp-Saw
| 09***01 | Bolt-Socket Head; (M8x1.25x40-mm) | 1 |
| 21***85 | Kit-Seal; (Saw Cylinder) | 1 |
| 22***29 | Piston | 1 |
206-2003 Cylinder Gp-Saw
| 20***03 | Cylinder Group-Saw | 1 |
| 21***85 | Kit-Seal; (Saw Cylinder) | 1 |
| 6V***75 | Bearing | 2 |
156-1228 Cylinder Gp-Saw
| 15***28 | Cylinder Group-Saw | 1 |
| 16***52 | Kit-Seal | 1 |
| 6V***75 | Bearing | 2 |
156-4147 Cylinder Gp-Tilt
| 15***47 | Cylinder Group-Tilt | 1 |
| 16***45 | Bearing | 2 |
| 16***53 | Kit-Seal | 1 |
206-2000 Cylinder Gp-Tilt
| 16***45 | Bearing | 2 |
| 20***00 | Cylinder Group-Tilt | 1 |
| 21***82 | Kit-Seal; (Tilt Cylinder) | 1 |
184-6516 Housing Gp-Motor
| 09***73 | Bolt; (Socket Head) (M12x1.75x60mm) | 6 |
| 18***16 | Housing Group-Motor | 1 |
| 18***17 | Cover-Valve | 1 |
194-6593 Housing Gp-Motor
| 09***73 | Bolt; (Socket Head) (M12x1.75x60mm) | 6 |
| 18***18 | Valve | 1 |
| 18***19 | Kit-Seal | 1 |
194-7953 Hydraulic Ar
| 19***53 | Hydraulic Ar | 1 |
| 19***59 | Cylinder & Lines Group-Saw | 1 |
| 19***60 | Cylinder & Lines Group-Meas & Fdg | 1 |
197-2070 Lines Gp-Hydraulic
| 14***25 | Connector As. | 1 |
| 14***51 | Elbow Group | 1 |
| 19***70 | Lines Group-Hydraulic | 1 |
162-5756 Lubrication Ar -Saw & Feed Roller
| 15***51 | Tank & Lines Group-Lubrication | 1 |
| 15***14 | Pump Group-Lubrication | 1 |
| 16***56 | Lubrication Ar; -Saw & Feed Roller | 1 |
155-9921 Motor Gp-Piston
| 15***21 | Motor Group-Piston | 1 |
| 18***11 | Cylinder Group-Piston | 1 |
| 18***14 | Kit-Cam | 1 |
165-4118 Motor Gp-Piston
| 16***18 | Motor Group-Piston | 1 |
| 18***11 | Cylinder Group-Piston | 1 |
| 18***14 | Kit-Cam | 1 |
173-0659 Motor Gp-Saw
| 15***09 | Motor Group-Saw | 1 |
| 15***59 | Washer | 6 |
| 15***64 | Plug | 2 |
155-9909 Motor Gp-Saw
| 10***11 | Plug, Includes: | 2 |
| 15***09 | Motor Group-Saw | 1 |
| 18***90 | Rotating Group-Motor | 1 |
158-0414 Pump Gp-Lubrication
| 15***12 | Fitting | 1 |
| 15***16 | Scraper | 1 |
| 15***20 | Valve-Check | 1 |
183-3990 Rotating Gp-Motor
| 14***97 | Cover | 1 |
| 14***98 | Washer; (12.7x17.5x0.3-mm Thk) | 1 |
| 14***99 | Plate-Retainer | 1 |
157-6251 Tank & Lines Gp-Lubrication
| 15***85 | Valve Group-Breather | 1 |
| 15***95 | Strainer As | 1 |
| 15***84 | Fitting | 1 |
199-6366 Valve & Mtg Gp-Main Control
| 19***18 | Valve Group-Bank 8 | 1 |
| 19***66 | Valve & Mtg Group-Main Control | 1 |
| 7X***37 | Bolt-Plt; (M8 X 1.25 X 35) | 4 |
224-7577 Valve & Mtg Gp-Main Control
| 15***40 | Washer; (M10) | 4 |
| 22***77 | Valve & Mtg Group-Main Control | 1 |
| 22***85 | Valve Group-Bank 7 | 1 |
229-9785 Valve Gp-Bank 7
| 16***51 | Kit-Seal | 9 |
| 19***73 | Valve Group-Control; -Pump | 1 |
| 19***76 | Valve Group-Control; -Upper Delimbing Knife | 1 |
194-7118 Valve Gp-Bank 8
| 16***51 | Kit-Seal | 9 |
| 19***18 | Valve Group-Bank 8 | 1 |
| 19***73 | Valve Group-Control; -Pump | 1 |
214-3508 Valve Gp-Bank 8
| 16***51 | Kit-Seal | 9 |
| 19***73 | Valve Group-Control; -Pump | 1 |
| 19***74 | Valve Group-Control; -Saw | 1 |
156-0285 Valve Gp-Breather
| 15***85 | Valve Group-Breather | 1 |
| 15***56 | Fitting | 1 |
| 16***86 | Breather | 1 |
199-8080 Valve Gp-Control -End Block
| 19***80 | Valve Group-Control; -End Block | 1 |
| 19***00 | Manifold | 1 |
| 19***07 | Valve Group-Pressure Reducing | 2 |
211-8770 Valve Gp-Control
| 16***07 | Valve Group-Solenoid; (Medium Pressure) | 1 |
| 16***84 | Spool As | 1 |
| 17***73 | Valve As-Line Relief | 1 |
199-8079 Valve Gp-Control -Tilt
| 16***41 | Spool As | 1 |
| 17***72 | Valve As-Line Relief | 1 |
| 17***74 | Valve As-Line Relief | 1 |
199-8074 Valve Gp-Control -Saw
| 16***84 | Spool As | 1 |
| 17***70 | Valve As-Line Relief | 1 |
| 17***76 | Valve Group-Pilot Relief | 1 |
199-8078 Valve Gp-Control -Lower Delimbing Knife
| 17***74 | Valve As-Line Relief | 1 |
| 17***80 | Valve As-Line Relief | 1 |
| 17***32 | Kit-Seal | 1 |
214-3505 Valve Gp-Control
| 16***84 | Spool As | 1 |
| 17***32 | Kit-Seal | 1 |
| 19***08 | Seal-O-Ring | 2 |
199-8073 Valve Gp-Control -Pump
| 03***27 | Seal-O-Ring; (19.18mm Id) | 1 |
| 15***40 | Washer; (M10) | 2 |
| 19***73 | Valve Group-Control; -Pump | 1 |
199-8077 Valve Gp-Control -Roller Clamp
| 17***74 | Valve As-Line Relief | 1 |
| 17***75 | Valve As-Line Relief | 1 |
| 17***32 | Kit-Seal | 1 |
199-8076 Valve Gp-Control -Upper Delimbing Knife
| 17***73 | Valve As-Line Relief | 1 |
| 17***23 | Valve As-Line Relief | 1 |
| 17***32 | Kit-Seal | 1 |
214-3506 Valve Gp-Control
| 16***84 | Spool As | 1 |
| 17***32 | Kit-Seal | 1 |
| 19***08 | Seal-O-Ring | 2 |
224-6026 Valve Gp-Control -Oil Manifold
| 19***07 | Valve Group-Pressure Reducing | 2 |
| 22***26 | Valve Group-Control; -Oil Manifold | 1 |
| 23***53 | Manifold | 1 |
199-8107 Valve Gp-Pressure Reducing
| 03***27 | Seal-O-Ring; (19.18mm Id) | 1 |
| 03***43 | Seal-O-Ring | 1 |
| 18***27 | Ring-Backup | 2 |
214-3507 Valve Gp-Relief
| 19***06 | Valve Group-Relief | 2 |
| 21***18 | Manifold | 1 |
| 21***07 | Valve Group-Relief | 1 |
Service Equipment And Supplies
169-2758 Film Gp
| 16***58 | Film Group | 1 |
| 17***70 | Film | 2 |
166-9180 Plate & Film Gp
| 13***76 | Film; (Warning) (Universal) (Lh Side Post Inside Cab) | 1 |
| 16***91 | Film-Identification; (Chain Oil) | 1 |
| 16***80 | Plate & Film Group | 1 |
197-5088 Tool Gp-Hand
| 16***53 | Wrench-T-Handle; (6-mm Hex) | 1 |
| 16***56 | Hook As-Cleaning | 1 |
| 16***71 | Wrench-Spanner | 1 |
Work Tools
157-6853 Arm Gp-Feed Roller -Lh
| 09***78 | Pin-Spring | 1 |
| 15***36 | Guide | 2 |
| 15***37 | Ring | 2 |
157-6848 Arm Gp-Feed Roller -Rh
| 09***78 | Pin-Spring | 1 |
| 15***36 | Guide | 2 |
| 15***37 | Ring | 2 |
198-3012 Arm Gp-Grapple
| 15***98 | Washer; (M8x1.25-Thd) | 2 |
| 15***97 | Arm As-Holding | 1 |
| 16***39 | Bushing | 2 |
157-6242 Arm Gp-Measuring
| 08***73 | Screw-Countersink Head | 3 |
| 09***50 | Ring-Retaining | 1 |
| 13***40 | Locknut; (M8x1.25-Thd) | 1 |
198-3005 Control Ar-Color Marking
| 19***05 | Control Ar-Color Marking | 1 |
| 19***09 | Control Group-Color Marking | 1 |
| 19***12 | Arm Group-Grapple | 1 |
198-3009 Control Gp-Color Marking
| 09***49 | Bolt; (M8x1.25x40-mm) | 2 |
| 14***94 | Guard; (15-cm) | 0 |
| 15***71 | Kit-Connecting Plug; (4-Pin) | 1 |
189-5510 Damper Gp-Harvester Head
| 15***41 | Pin As | 1 |
| 15***43 | Washer | 1 |
| 15***44 | Nut | 1 |
155-8800 Damper Gp-Harvester Head
| 15***00 | Damper Group-Harvester Head | 1 |
| 15***40 | Body-Damper | 1 |
| 15***41 | Pin As | 1 |
196-4834 Frame Ar-Harvester Head
| 15***45 | Yoke Group-Harvester Head | 1 |
| 16***80 | Plate & Film Group | 1 |
| 19***34 | Frame Ar-Harvester Head | 1 |
197-4795 Frame Gp-Harvester Head
| 12***17 | Bolt-Socket Head; (M24x3x70-mm) | 2 |
| 14***02 | Bolt-Socket Head; (M6x1x10-mm) | 8 |
| 15***40 | Washer; (M10) | 11 |
194-8100 Head Ar-Harvester
| 15***00 | Damper Group-Harvester Head | 1 |
| 15***21 | Motor Group-Piston | 2 |
| 15***40 | Roller Group-Feed; -Rh | 1 |
156-5252 Holder Gp-Saw Bar
| 09***60 | Setscrew-Socket; (M6x1x6-mm) | 1 |
| 15***52 | Holder Group-Saw Bar | 1 |
| 15***53 | Kit-Pin; (Contains 10 Pieces) | 1 |
228-3873 Housing Gp-Chain Tensioner
| 08***65 | Bolt; (M3x0.5x8-mm) | 2 |
| 09***19 | Ring-Retaining | 1 |
| 09***73 | Setscrew-Socket | 2 |
219-2535 Measuring Ar-Harvester Head
| 21***34 | Measuring Ar-Harvester Head; (Field Installation) | 1 |
| 21***35 | Measuring Ar-Harvester Head | 1 |
157-6240 Roller Gp-Feed -Rh
| 13***40 | Locknut; (M8x1.25-Thd) | 1 |
| 13***13 | Bolt | 6 |
| 15***46 | Pin As | 1 |
157-6241 Roller Gp-Feed -Lh
| 13***40 | Locknut; (M8x1.25-Thd) | 1 |
| 13***13 | Bolt | 6 |
| 15***46 | Pin As | 1 |
163-3978 Rotator Gp-Hydraulic
| 12***76 | Bolt; (M10x1.5x130-mm) | 10 |
| 15***42 | Plug | 2 |
| 15***59 | Spring | 12 |
210-1506 Rotator Gp-Hydraulic
| 12***76 | Bolt; (M10x1.5x130-mm) | 10 |
| 15***42 | Plug | 2 |
| 15***59 | Spring | 12 |
162-5757 Saw Ar-Chain
| 16***57 | Saw Ar-Chain | 1 |
| 17***59 | Motor Group-Saw | 1 |
| 18***60 | Saw Group-Chain | 1 |
187-8460 Saw Gp-Chain
| 09***19 | Ring-Retaining | 1 |
| 09***79 | Setscrew-Socket | 3 |
| 15***40 | Washer; (M10) | 7 |
228-3874 Tensioner Gp-Chain
| 09***88 | Setscrew | 3 |
| 15***52 | Holder Group-Saw Bar | 2 |
| 15***81 | Kit-Seal | 1 |
157-7077 Wheel Gp-Feed Roller -Lh
| 15***61 | Screw | 5 |
| 15***77 | Wheel Group-Feed Roller; -Lh | 1 |
| 16***09 | Chain; (20m) | 0 |
157-6865 Wheel Gp-Feed Roller -Rh
| 15***61 | Screw | 5 |
| 15***65 | Wheel Group-Feed Roller; -Rh | 1 |
| 16***09 | Chain; (20m) | 0 |
157-6245 Yoke Gp-Harvester Head
| 09***70 | Bolt-Socket Hd; (M12 X 1.75 X 45) | 4 |
| 09***28 | Ring-Retaining; (External) | 2 |
| 15***45 | Fitting-Grease | 2 |
HH45 serial number reference
The PIN plate for the HH45 is mounted on the harvester head itself, not on the carrier (excavator or wheel harvester) it is mounted to. Read the first 3 characters as the prefix identifying the production run, followed by the sequential unit number. Match the plate's full PIN against the parts or service manual covering that specific prefix range to confirm the correct running-change point.
| Prefix | Identifies | Notes |
|---|---|---|
| CFE | CABS / CABSWIN control generation | Later production run of the HH45 harvester head, built with the CABS control box and CABSWIN control software. Covers CFE1-up through the current-production top end. The factory parts book for this run lists several internal running-change breakpoints (cylinder, valve, damper, rotator, and control-box updates) within the single CFE-prefix run, not separate models. Treat as one production block; confirm the exact breakpoint for a given serial with your dealer. |
| 2JZ | Early / DASA electronic control generation | Earlier production run of the HH45, built before the CABS/CABSWIN update, using the DASA electronic measuring-and-control system. Covers 2JZ1-up. Distinct parts and electrical manuals exist for this run separate from the later CFE-prefix book. Rough years not confirmed from available sources — confirm era with your dealer. |
Frequently asked questions
Does the Caterpillar HH45 have its own engine?
No. The HH45 is a harvester head attachment with no engine, fuel tank, or cooling system of its own. It runs entirely on the host carrier's hydraulic system and has no independent hydraulic reservoir.
What carriers does the HH45 mount on?
The HH45 is factory-supported on two carrier types: purpose-built wheel or track harvester base machines and hydraulic excavators. It hangs from the carrier's boom or dangle link through a hydraulic rotator bolted to the head's upper yoke; there is no quick-attach coupler.
What is the difference between DASA and CABS control on the HH45?
Earlier HH45 production, serial prefix 2JZ, used a third-party DASA electronic measuring-and-control system. Later production, serial prefix CFE, switched to Caterpillar's own CABS control, available as a single control-station Cabswin unit or dual control-station Cabsdos unit, with a keypad and printer for bucking data.
What HH45 owners discuss
What feed roller and delimbing knife wear patterns show up most on the HH45?
How should saw bar and chain be tensioned and maintained on this head?
How accurate is the HH45's measuring arm, and what throws off calibration?
What are the common rotator seal and bearing wear points?
CABS versus DASA control - what should an owner know?
How does hydraulic flow and pressure matching work when moving the HH45 between carriers?
What should a buyer check on a used HH45?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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