Caterpillar 345B II
Maintenance schedule, common problems & OEM parts breakdown
The Cat 345B Series II is a heavy production-class crawler excavator in the 44 to 49 tonne (about 97,000 to 108,000 lb) operating weight bracket, sized above the 330 class and below Cat's largest mining-support excavators. Every 345B Series II carries the Cat 3176C ATAAC inline-six, a 10.3 L turbocharged-and-aftercooled diesel rated 257 kW (345 hp) gross and 239 kW (321 hp) net at the flywheel, meeting EPA Tier 2/ADEM II emissions. Cat built the Series II generation roughly from 2001 to 2005 as the direct update to the original 345B (Series I), then replaced it in 2005 with the 345C L. The Series II shipped off one base chassis in several factory fronts: a standard boom/stick, a mass-excavation (LME) build for quarry loading and larger buckets, a long-reach front for extended digging depth, and an MH material-handler variant.
Across the Series II run Cat carried the 3176C powertrain and pilot-hydraulic implement controls unchanged, so most of the variation between individual machines comes from boom, stick, and undercarriage combination rather than a mid-cycle engine or control-system swap; operating weight, hydraulic flow, and reach shift by several tonnes and a meter or more depending on which front and undercarriage a given unit left the factory with. That shared architecture is what keeps the 345B II relevant in the used and parts market today: the 3176C engine, TDTO-lubricated final and swing drives, and pilot-valve implement circuit are common across the whole Series II line, so a parts book or fluid-analysis baseline built on one configuration largely carries over to the others. In the used market it sits as a mechanically simpler, lower-cost alternative to the ACERT-engined 345C and 345D, with no exhaust aftertreatment to maintain and a well-established parts supply.
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 345B II specifications
Engine
| Engine model | Cat 3176C ATAAC, inline-6, turbocharged, air-to-air aftercooled |
| Gross power | 257 kW (345 hp) at 2000 rpm |
| Net power | 239 kW (321 hp) at 2000 rpm, ISO 9249 / SAE J1349 |
| Displacement | 10.3 L (628.6 cu in), bore 125 mm (4.92 in) x stroke 140 mm (5.51 in) |
| Cylinders | 6, in-line, 4-stroke diesel |
| Emissions / fuel system | Meets EPA Tier 2; electronic (ADEM II) fuel injection control |
Weights
| Operating weight, standard boom/stick | approx. 44.4-44.5 t (97,900-98,000 lb), long-undercarriage chassis |
| Operating weight, mass-excavation/long-reach configuration | approx. 48.9-51.3 t (108,000-113,100 lb); heavier with longer boom-stick combinations |
| Ground pressure | approx. 90 kPa (13.1 psi) on standard shoes |
Dimensions
| Transport length | approx. 11.5 m (37'9"), varies with boom/stick fitted |
| Transport width | 2.99-4.33 m (9'10"-14'2"), varies with undercarriage gauge and track shoe width |
| Transport height, to cab top | 3.66-3.69 m (12'0"-12'1") |
| Tail swing radius | 3.66 m (12'0") |
| Track shoe width | 900 mm (36 in) standard triple-grouser; 750 mm (30 in) optional |
| Ground clearance | 0.73 m (2'5") |
| Track (undercarriage) length | 5.37 m (17'8") |
Performance
| Max dig depth | 7.2 m (23'7") with standard mass-excavation stick, up to 9.3 m (30'6") with longer reach stick; varies by boom/stick configuration |
| Max reach at ground level | 11.3 m (37'0") standard, up to 13.0 m (42'8") with reach boom and stick |
| Max dump height | approx. 7.2 m (23'8") with standard mass-excavation stick |
| Swing speed | 8.6 rpm |
| Max travel speed | 4.4 km/h (2.8 mph) |
| Gradeability | 70% (35 degrees) |
| Drawbar pull | 331 kN (74,400 lbf), long-undercarriage chassis |
Forces
| Bucket digging force | 232-261 kN (52,200-58,700 lbf), depending on boom type (Reach vs Mass boom) |
| Arm (stick) digging force | 156-198 kN (35,100-44,500 lbf), depending on stick length; shorter stick gives higher force |
Service capacities (summary)
| Fuel tank | 720 L (190 gal) |
| Hydraulic system | 520 L (137 gal) total, including 208 L (55 gal) tank |
| Engine oil | 30 L (7.9 gal) |
| Cooling system | 45 L (12 gal) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
345B II fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | 30 L (7.9 US gal) | Cat DEO or Cat DEO-ULS multigrade diesel engine oil. Viscosity by ambient temperature: SAE 10W-30 for -18°C to 40°C (0°F to 104°F), SAE 15W-40 for -9.5°C to 50°C (15°F to 122°F). Cat DEO SYN (5W-40) or Cat Arctic DEO SYN (0W-30) for cold-start service down to -40°C (-40°F). |
| Cooling system | 45 L (12 US gal) | Cat ELC (Extended Life Coolant) preferred, or Cat DEAC (Diesel Engine Antifreeze/Coolant). The air-to-air aftercooled 3176C engine needs a minimum 30% glycol content to prevent water pump cavitation. A 1:1 water-to-glycol mix gives freeze protection to about -37°C (-34°F); raise glycol percentage for colder climates. |
| Fuel tank | 720 L (190 US gal) | No. 2-D distillate diesel meeting Cat fuel spec, or No. 1-D winter-blend fuel in cold climates. Minimum cetane number 40. |
| Hydraulic system total (including tank) | 520 L (137 US gal) | Cat HYDO Advanced 10 (SAE 10W) preferred for -20°C to 40°C (-4°F to 104°F) ambient. Alternates by climate: Cat HYDO, Cat TDTO, Cat DEO/DEO-ULS, or Cat MTO, spanning SAE 0W-20 in extreme cold up to SAE 15W-40 in hot climates. |
| Hydraulic tank | 210 L (55 US gal) | Same Cat HYDO Advanced 10 / HYDO / TDTO family as the hydraulic system total, matched to ambient temperature. |
| Final drive (each) | 15 L (4.0 US gal) | Cat TDTO (Transmission/Drive Train Oil) meeting the Cat TO-4 spec. Viscosity by climate runs SAE 0W-20 in extreme cold up to SAE 50 in hot climates per Cat's final drive/swing drive viscosity chart for track-type hydraulic excavators. |
| Swing drive | 9.9-11 L (2.6-2.9 US gal) - varies by configuration/series | Same Cat TDTO TO-4 family as the final drive, viscosity matched to ambient temperature. |
| Grease (chassis, pin joints, swing gear) - spec only | N/A | Cat Multipurpose Grease (NLGI 2) for general chassis and pin joints under moderate loads and temperatures. Cat Advanced 3Moly Grease for heavily loaded boom/stick/bucket linkage pins. Cat Ultra 5Moly Grease for the swing gear/ring - its tacky calcium-sulfonate-complex formulation clings to the vertical swing gear face and resists galling better than standard grease. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar 345B II maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 6,000 h |
|
Servicing the 345B II beyond the schedule
Predictive Maintenance & Fluid Analysis
Run S·O·S sampling on the 3176C engine oil, the roughly 520 L hydraulic system, and both final/swing drive gearboxes on the same interval as the fluid changes; the ATAAC turbo and aftercooler show early wear through soot and fuel-dilution trends before any power loss is felt. Pull ECM fault history through Cat ET at every service. Because implement control on this machine is pilot-hydraulic rather than electronic, joystick response and pilot-pressure drift are mechanical wear, not ECM codes, so track them separately in your service log.
Corrective & Common Repairs
Most corrective work on the 345B II traces to the pilot control valve and joystick assemblies; sluggish or drifting implement response is a pilot-circuit wear issue, not an electronic fault, on this generation. Expect turbocharger and ATAAC aftercooler core repairs on high-hour 3176C engines, plus main control valve spool wear from contaminated hydraulic oil. Undercarriage wear on the 900 mm shoes, rollers, and idlers is routine at this weight class; replace before pin and bushing wear reaches the OMM scrap limit to avoid chain and sprocket damage.
Overhaul & Rebuild Points
At major overhaul hours, prioritize the 3176C top end (injectors, turbocharger, cylinder head) and the main hydraulic pump and control valve, since both carry the full digging load of a 44 to 49 tonne machine. Check swing bearing and swing drive gear condition against OMM wear tolerances before committing to a full rebuild; bearing play here also shortens boom and stick pin life. Undercarriage rebuild (rollers, idlers, sprockets, track chain) is typically the single highest-cost line item on a used 345B II and should be quoted before purchase, not after.
Seasonal & Environment Servicing
Verify the 3176C's ether-assist cold-start system and coolant concentration each fall; confirm the starting aid works before the first hard freeze, not after a failed start. Switch hydraulic oil viscosity grade for the season if the machine works outside the OMM's ambient temperature band for its standard fluid. In hot, dusty, or abrasive ground, shorten the grease interval on the boom, stick, and bucket pins and the swing bearing, and check the ATAAC aftercooler core and radiator fins for packed debris that cuts cooling capacity.
345B II fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| 100-1 | Engine oil pressure reading below normal range - low oil pressure warning | Low oil level, worn oil pump, plugged filter, or a failing oil pressure sensor/wiring | Check oil level and filter condition first, then verify sensor wiring and connector before replacing the sensor |
| 110-0 | Engine coolant temperature reading above normal range - high coolant temperature warning | Low coolant level, plugged radiator/core, failed fan drive, or a faulty coolant temperature sensor | Check coolant level and radiator for debris, confirm fan operation, then check sensor circuit |
| 111-1 | Engine coolant level reading below normal range - low coolant level warning | Coolant leak in the system or a failed coolant level sensor/probe | Inspect for external or internal coolant leaks, top off coolant, then verify sensor operation |
| 94-1 | Fuel delivery pressure reading below normal range - low fuel pressure warning | Clogged fuel filter, restricted fuel supply line, failing transfer pump, or air in the fuel system | Replace fuel filters, check supply lines for restriction, and bleed air from the system before condemning the transfer pump |
| 190-2 | Engine speed/timing sensor signal erratic, intermittent, or incorrect | Damaged sensor tip clearance, loose sensor, chafed harness, or connector corrosion at the speed/timing sensor | Check sensor air gap and mounting, inspect harness and connector for damage or corrosion, reseat and retest |
| 174-0 | Fuel temperature sensor reading above normal range - fuel running hot | Restricted fuel return line, high ambient/engine bay heat soak, or a drifting fuel temperature sensor | Check fuel return routing for restriction, allow cool-down and recheck, then verify sensor reading against a known-good reference |
| 262-3 | 5-volt sensor supply voltage above normal range - open circuit or short to a higher voltage source on a shared sensor supply | Chafed harness shorting the sensor supply wire, corroded connector pin, or an internal ECM supply fault | Inspect harness and connectors feeding the affected sensors for shorts or damage before replacing components |
| 1-5 | Cylinder #1 injector solenoid current below normal - open circuit on the injector solenoid | Broken or disconnected injector wiring, failed injector solenoid, or a bad ECM driver circuit | Check injector wiring continuity and connector condition, swap injector connector to confirm, then test the injector solenoid |
| 168-2 | Electrical system voltage erratic or intermittent | Loose or corroded battery terminals, failing alternator/regulator, or an intermittent ground connection | Check battery terminals and main grounds, load-test the batteries, and check charging output at idle and at rated speed |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
345B II attachments & work tools
Buckets
General-purpose (GP) buckets for this size class run up to about 2150 mm (84.6 in) wide at roughly 3.4 m3 (4.5 yd3); heavy-duty (HD) buckets are narrower and heavier, typically 1200-1370 mm (48-54 in) wide in the 1.6-2.4 m3 (2.1-3.0 yd3) range with 4-5 teeth for tougher digging and rock work. Buckets mount pin-on through the F-linkage bucket system, with pin diameters around 100 mm at the stick side and 80 mm at the linkage side; pin-on is the standard bucket mount at this weight class, with a hydraulic coupler as an option rather than the default.
Hydraulic hammers
This size class lines up with Cat's H160/H180 breaker range, energy class roughly 8,500-12,000 ft-lb (11,500-16,300 J), built for carriers from about 32-55 t up to 40-80 t. Operating weight for this machine (roughly 44-49 t depending on undercarriage and boom/stick configuration) puts it at the top of the H160 class or the low end of H180, so exact breaker size varies by configuration and rock hardness - confirm the specific match before ordering.
Quick couplers
Hydraulic pin-grabber quick couplers on this size class use the TB-linkage family, the same linkage used by the factory ripper for this range (roughly 110 mm stick pin, 100 mm bucket-side pin). A pin-grabber coupler lets the operator swap buckets and other tools from the cab; straight pin-on mounting without a coupler is still common at this weight class when maximum bucket capacity matters more than tool-change speed.
Thumbs/grapples
Full-rotation hydraulic thumb kits are offered for this size class, typically paired with a 1370 mm (54 in) bucket and mounted pin-on alongside the stick for grabbing rock, stumps and debris. Demolition and material-handling grapples are offered through the Material Handler / UHD factory configuration of this model, which adds reinforced structure and a dedicated attachment circuit for grapples, shears and crushers - this is a special-order variant, not the standard excavator configuration.
Rippers
A single-shank ripper is available for this size class, mounted through the TB-linkage system with roughly 110 mm stick pin and 100 mm linkage pin diameter - the same linkage family used for pin-grabber couplers on this machine. It is used for breaking up hard-pack, rock, or frozen ground ahead of bucket digging.
Hydraulic kit notes
Factory systems-operation literature covers a shared auxiliary hydraulic system across the 320B through 345B Series II excavator range, separate from the main boom/stick/bucket implement hydraulics. The auxiliary flow-control option offers up to four programmable flow presets so the operator can match flow and pressure to hammers, shears, processors and brush cutters; confirm exact flow/pressure settings for a given tool against the machine's own auxiliary hydraulic documentation before hookup.
All 345B II assemblies by section
Every catalogued assembly group for the Caterpillar 345B II. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Electrical And Starting System
160-3576 Control Gp-Hydraulic Generator
| 09***21 | Rail-Mounting; (60-cm) | 0 |
| 10***33 | Kit; (Receptacle) (Includes Receptacle As) | 1 |
| 12***74 | Bushing; (3/4-14 Thd) | 3 |
191-2971 Generator Ar-Hydraulic
| 19***20 | Enclosure Group-Generator | 1 |
| 19***71 | Generator Ar-Hydraulic | 1 |
| 19***31 | Generator Group-Hydraulic | 1 |
188-2632 Generator Ar-Hydraulic
| 18***32 | Generator Ar-Hydraulic | 1 |
| 18***33 | Generator Ar-Hydraulic | 1 |
| 18***48 | Installation Ar-Generator | 1 |
188-2633 Generator Ar-Hydraulic
| 18***33 | Generator Ar-Hydraulic | 1 |
| 18***34 | Generator Group-Hydraulic | 1 |
| 18***46 | Lines Group-Hydraulic | 1 |
194-3121 Generator Ar-Hydraulic
| 19***71 | Generator Ar-Hydraulic | 1 |
| 19***21 | Generator Ar-Hydraulic | 1 |
| 19***22 | Installation Ar-Generator | 1 |
189-2988 Generator Gp-Hydraulic
| 18***88 | Generator Group-Hydraulic | 1 |
| 19***28 | Brush | 4 |
| 19***34 | Holder-Brush | 2 |
191-7831 Generator Gp-Hydraulic
| 16***83 | Motor Group | 1 |
| 16***85 | Valve Group; -Hydraulic Generator | 1 |
| 17***99 | Film; (Warning) (Generator Disconnect Switch) | 2 |
188-2634 Generator Gp-Hydraulic
| 16***76 | Control Group; (Hydraulic Generator) | 1 |
| 16***81 | Mounting Group; (Motor) | 1 |
| 16***83 | Motor Group | 1 |
153-2521 Lamp Gp-Flood
| 15***21 | Lamp Group-Flood; -Chassis, Boom-Boom, Rear | 1 |
| 17***93 | Cover | 1 |
| 17***17 | Lens As; (Floodlight) | 1 |
205-6343 Panel Gp-Control
| 00***92 | Screw-Washer Head; (1/4-20x0.5-In) | 2 |
| 09***41 | Screw; (Machine) (M6x1thd) | 2 |
| 09***21 | Rail-Mounting; (60-cm) | 1 |
191-7833 Wiring Gp-Generator
| 06***88 | Locknut; (1-11-1/2-Thd) | 2 |
| 06***08 | Locknut; (1-11-1/4-Thd) | 4 |
| 10***48 | Bushing | 2 |
188-2647 Wiring Gp-Generator
| 06***88 | Locknut; (1-11-1/2-Thd) | 2 |
| 06***08 | Locknut; (1-11-1/4-Thd) | 2 |
| 10***48 | Bushing | 2 |
190-1582 Wiring Gp-Generator
| 10***01 | Kit; (Receptacle) (12-Pin) (Includes Receptacle As & Wedge) | 1 |
| 10***03 | Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge) | 1 |
| 12***52 | Kit-Cap | 1 |
Frame And Body
191-8588 Enclosure Gp-Generator
| 03***15 | Pin | 1 |
| 09***91 | Bolt; (Locking) (M12x1.75x25mm) | 2 |
| 13***55 | Bolt; (M8x1.25x8-mm) | 10 |
190-3420 Enclosure Gp-Generator
| 03***15 | Pin | 1 |
| 13***55 | Bolt; (M8x1.25x8-mm) | 10 |
| 18***84 | Hinge | 1 |
Hydraulic System
191-7830 Control & Mtg Gp-Joystick
| 08***70 | Sleeve | 16 |
| 10***01 | Kit; (Receptacle) (12-Pin) (Includes Receptacle As & Wedge) | 1 |
| 10***03 | Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge) | 1 |
177-2543 Drive Gp-Pump
| 09***91 | Ball Bearing | 1 |
| 12***01 | Seal-O-Ring | 1 |
| 17***43 | Drive Group-Pump | 1 |
129-7995 Drive Gp-Auxiliary Pump
| 09***91 | Ball Bearing | 1 |
| 12***95 | Drive Group-Pump | 1 |
| 12***97 | Gear | 1 |
194-3122 Installation Ar-Generator
| 08***32 | Cap | 1 |
| 18***98 | Bar | 2 |
| 18***03 | Guard As | 1 |
188-2648 Installation Ar-Generator
| 18***98 | Bar | 2 |
| 18***03 | Guard As | 1 |
| 18***51 | Plate | 1 |
191-7832 Lines Gp-Hydraulic
| 11***49 | Fitting As; (Quick Disconnect) | 2 |
| 14***70 | Elbow, 90°,-8 Orb Swiv. /-8 Orfs | 2 |
| 14***75 | Elbow Group | 1 |
194-0574 Lines Gp-Hydraulic
| 12***90 | Hose-Hydraulic; (101.2-In) | 0 |
| 12***32 | Coupling-Permanent | 1 |
| 12***49 | Coupling-Permanent | 1 |
191-7829 Lines Gp-Hydraulic
| 10***18 | Block | 1 |
| 12***90 | Hose-Hydraulic; (101.2-In) | 0 |
| 12***61 | Coupling-Permanent | 1 |
188-2646 Lines Gp-Hydraulic
| 11***49 | Fitting As; (Quick Disconnect) | 2 |
| 14***70 | Elbow, 90°,-8 Orb Swiv. /-8 Orfs | 1 |
| 14***75 | Elbow Group | 1 |
179-3625 Pump Gp-Gear
| 13***78 | Seal; (112.9mm Od) | 1 |
| 13***21 | Flange As | 1 |
| 13***23 | Gear-Drive; (15-Teeth) | 1 |
160-5885 Valve Gp-Flow Control & Relief
| 16***55 | Valve Group; (Check) | 1 |
| 16***56 | Valve-Needle; (Generator Speed) | 1 |
| 16***73 | Retainer | 1 |
345B II serial number reference
The PIN plate on a 345B Series II is riveted to the machine frame, usually on the right-hand side near the cab or front of the upper frame — check there before assuming a stamped location elsewhere on the undercarriage. Read the first three characters of the plate as the alpha serial prefix (identifies the specific build/parts-book series), and the digits that follow as the sequential unit number within that series.
| Prefix | Identifies | Notes |
|---|---|---|
| AGS | 345B L Series II (long/mass-excavation undercarriage) | Track-type excavator build series for the L (long) configuration. Fitted with the Cat 3176C ATAAC diesel, about 239 kW (321 hp) net flywheel power. Early Series II production run, around 2001. |
| ALB | 345B Series II and 345B L Series II (standard and long undercarriage) | Parts and service documentation groups this prefix with the standard and long-undercarriage Series II excavator together. Same 3176C ATAAC engine as the rest of the Series II line. |
| AKJ | 345B Series II and 345B L Series II (standard and long undercarriage) | Covered in the same combined standard/L Series II service literature as ALB. 3176C ATAAC engine. |
| AKX | 345B Series II (standard undercarriage) | Track-type excavator build series within the Series II line, 3176C ATAAC engine. |
| ALD | 345B Series II | Dedicated Series II service literature documented under this build series. 3176C ATAAC engine. |
| AMD | 345B Series II and 345B L Series II (standard and long undercarriage) | Grouped with AMJ, AMN, AYR in a combined standard/L Series II parts catalog. 3176C ATAAC engine. |
| AMJ | 345B Series II and 345B L Series II (standard and long undercarriage) | Grouped with AMD, AMN, AYR in the same combined standard/L Series II parts catalog. |
| AMN | 345B Series II and 345B L Series II (standard and long undercarriage) | Grouped with AMD, AMJ, AYR in the same combined standard/L Series II parts catalog. |
| AYR | 345B Series II and 345B L Series II (standard and long undercarriage) | Grouped with AMD, AMJ, AMN in the same combined standard/L Series II parts catalog. Confirm exact break point with dealer. |
| DCW | 345B Series II | Dedicated Series II schematic/service literature documented under this build series. 3176C ATAAC engine. |
| CCC | 345B Series II | Dedicated parts manual documented for this build series under the Series II excavator line, 3176C ATAAC engine. |
| FEE | 345B Series II | Dedicated service manual documented for this build series, 3176C ATAAC engine. |
| DET | 345B Series II Material Handler (MH) | Boom/undercarriage configured for scrap and material-handling duty rather than mass excavation. Same 3176C ATAAC engine as the excavator line. Covered in its own MH-specific Specalog and service literature. |
| APB | 345B Series II Material Handler (MH) | Second MH-configured build series alongside DET, same 3176C ATAAC engine, dedicated MH service literature. |
Frequently asked questions
What engine does the Cat 345B Series II use?
Every 345B Series II runs the Cat 3176C ATAAC inline-six, a 10.3 L turbocharged-and-aftercooled diesel rated 257 kW (345 hp) gross and 239 kW (321 hp) net at the flywheel, meeting EPA Tier 2/ADEM II emissions.
What is the operating weight of the 345B Series II?
Operating weight runs roughly 44 to 49 tonnes (about 97,000 to 108,000 lb) depending on boom/stick combination and undercarriage width, with the standard long-undercarriage build near the low end and mass-excavation (LME) builds near the top.
What replaced the Cat 345B Series II?
Cat replaced the 345B Series II with the 345C L in 2005. The 345C L moved to the C13 ACERT engine for Tier 3 emissions compliance and added a new long-reach boom option while keeping a similar digging envelope.
What 345B II owners discuss
What hydraulic quirk do owners commonly report on the 345B II once the machine warms up?
What usually causes a total loss-of-swing complaint on this machine, and how do techs trace it?
What engine-related quirks show up most on the 3176C in the 345B II?
How fast does undercarriage wear on a 345B II, and what should owners watch for?
What electrical or sensor fault codes come up most for the 345B II's control system?
Boom or stick drift developed with hours on the machine — cylinder seal or valve?
What should a buyer check before purchasing a used 345B II?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific 345B II part?
Search live OEM part data, check fitment, and cross-reference alternatives with Heavy Parts AI.