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Jcb COMPACT II 5108

Maintenance schedule, common problems & OEM parts breakdown

The JCB COMPACT II 5108 is a compact excavator within the JCB compact equipment class, featuring a heavy-duty, fully welded H-frame undercarriage and a low center of gravity for stability. The machine utilizes JCB DieselMax or EcoMAX engines, which operate without Diesel Exhaust Fluid (DEF) or Selective Catalytic Reduction (SCR) systems. Operating weights for the compact excavator range vary by configuration, typically falling between 1.8 and 10 tons for the broader compact line, with specific models like the 86C-2 weighing approximately 19,180 lb. The COMPACT series includes zero tail swing (ZTS) and conventional tail swing configurations, designed for residential, landscaping, and commercial utility applications. The lineage includes predecessors such as the 801 series Gravemaster and successors in the 18Z through 100C series, offering varying tail swing radii and hydraulic flow capabilities.

Across generations, JCB compact excavators have shifted toward integrated O-Ring Face Seal (ORFS) hydraulic fittings for improved sealing and programmable twin auxiliary lines for versatile attachment operation. The COMPACT II 5108 matters in the used and parts market due to its extended 500-hour engine oil interval, which reduces downtime compared to competitors with 250-hour schedules. The machine's sealed-for-life track components and single-piece steel bodywork contribute to long-term durability, while the absence of DEF systems simplifies maintenance in colder climates. The market value is influenced by the availability of JCB-specific service data and the machine's reputation for rigid H-frame construction and ground-level service access.

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.

Jcb COMPACT II 5108 specifications

Engine

Engine ModelKohler KDI 2504 TCR
Gross/Net Power64.4 hp (48.0 kW)
Emissions TierEPA Tier 4 Final / EU Stage V

Weights

Operating Weight19,180 lb (8,700 kg)
Ground Pressure5.5 psi (38 kPa)

Dimensions

Overall Width90.6 in (2,301 mm)
Overall Height106.5 in (2,705 mm)
Overall Length253.3 in (6,434 mm)

Performance

Maximum Digging Depth172.0 in (4,370 mm)
Maximum Reach at Ground Level290.8 in (7,386 mm)
Maximum Dumping Height212.0 in (5,385 mm)
Bucket Breakout Force12,838 lbf (57,100 N)
Stick Digging Force9,060 lbf (40,300 N)

Service capacities (summary)

Fuel Tank Capacity29.6 gal (112 L)

Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.

Jcb COMPACT II 5108 maintenance schedule

Service intervalTasks
Every 10 h
  • Check engine oil, coolant, hydraulic fluid, and fuel levels.
  • Walk around machine to identify fluid leaks under engine bay, axles, and rams.
  • Inspect track tension, roller condition, and cut damage on tracks.
  • Check hoses and cylinders for chafing, seepage, or rod scoring.
  • Inspect GET components including teeth, cutting edge, and bucket pins.
  • Verify cab safety items: seat belt, mirrors, horn, backup alarm, and ROPS/FOPS.
Every 50 h
  • Grease all pivot points including boom, arm, bucket, and kingpost.
  • Check drive belt tension for alternator, A/C, and fan.
  • Inspect battery electrolyte levels on non-sealed units.
  • Check track tension on JS-series excavators.
  • Clean air filter housing and check for debris accumulation.
  • Test all warning lights, gauges, and safety systems.
Every 500 h
  • Change engine oil and filter using JCB Engine Oil Special or equivalent 15W-40 diesel oil.
  • Replace primary and secondary fuel filters.
  • Inspect hydraulic return filter magnet for metallic debris.
  • Take oil samples from engine, hydraulic, axle, and final drive systems.
  • Replace or clean air filter primary element per restriction indicator.
  • Document track or tire condition measurements against wear limits.
Every 1,000 h
  • Drain, flush, and refill cooling system with JCB-spec long-life coolant.
  • Change transmission oil and filter on backhoes and wheel loaders.
  • Change front and rear axle oil including hubs on wheeled machines.
  • Perform full ECM diagnostic scan via JCB ServiceMaster tool.
  • Interpret hydraulic oil samples against 500-hour baseline.
  • Check turbocharger shaft play, boot condition, and wastegate function.
  • Torque check slew ring bolts on JS-series excavators.
  • Measure complete undercarriage against JCB wear limits.
Every 2,000 h
  • Change hydraulic oil, clean tank, and refill with JCB-spec oil.
  • Inspect structural components (boom, arm, chassis) for cracking or unauthorized welding.
  • Measure swing ring play on JS-series excavators using dial indicators.
  • Service brakes including disc wear and immersed brake condition.
  • Check injector spray patterns via diagnostic tool and replace as required.
  • Service cab HVAC including A/C pressure, evaporator, and cabin filter.
  • Perform complete electrical system testing and repair identified issues.

Servicing the COMPACT II 5108 beyond the schedule

Predictive Maintenance & Fluid Analysis

At the 500-hour interval, collect oil samples from the engine, hydraulic tank, axle, and final drive to establish a baseline. Compare subsequent samples against this baseline to detect bearing wear or contamination 500 to 800 hours before failure. Inspect the hydraulic return filter magnet for metallic debris during every 500-hour service. Use JCB Engine Oil Special or equivalent 15W-40 diesel oil meeting API specifications. Monitor the hydraulic oil condition closely, as the 2000-hour service requires a full tank clean and oil change. Track undercarriage wear measurements at 1000 hours to predict component replacement needs.

Corrective & Common Repairs

Address hydraulic hose chafing and pinhole seepage identified during daily walkarounds to prevent system failure. Replace primary and secondary fuel filters at 500 hours to protect common-rail injectors on DieselMax and EcoMAX engines. Check turbocharger shaft play, boot condition, and wastegate function at 1000 hours to maintain engine performance. Inspect alternator and starter load to catch dying electrical components. Torque slew ring bolts on JS-series excavators during the 1000-hour service to ensure structural integrity. Replace worn GET components, including teeth and cutting edges, to maintain digging efficiency.

Overhaul & Rebuild Points

The 2000-hour service is the critical overhaul milestone, requiring a full hydraulic oil change and tank cleaning. Inspect the boom, arm, loader arm, chassis, and side frames for cracking or unauthorized welding. Measure swing ring play on JS-series excavators using radial and axial dial indicators to determine if the swing mechanism requires rebuilding. Service immersed brakes on backhoes and wheel loaders, checking disc wear. Check injector spray patterns via diagnostic tool and replace injectors as required. Perform complete electrical system testing to identify wiring faults or component degradation.

Seasonal & Environment Servicing

Allow proper warm-up time before applying heavy loads to prevent accelerated wear in cold conditions. Check battery electrolyte levels on non-sealed units during winter months to ensure reliable starting. Inspect cab HVAC system, including A/C pressure and evaporator condition, to maintain operator comfort in extreme temperatures. Store the machine under cover when possible to reduce corrosion on the 100% steel bodywork. Clean the undercarriage thoroughly to prevent debris buildup that accelerates wear on rollers and tracks. Verify coolant mixture and pressure test the cooling system quarterly to prevent catastrophic engine damage from overheating.

COMPACT II 5108 common service parts

Part numberPart
A2/1817Gasket, FilterCheck fitment →
PP/5135Element, SuctionCheck fitment →
PP/1775Element, FilterCheck fitment →
PP/1722FilterCheck fitment →
929/12004Element, SuctionCheck fitment →

Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.

COMPACT II 5108 fault codes & troubleshooting

CodeMeaningLikely causeWhat to do
203 EN TMPEngine Temperature Sensor FaultOpen circuit, short circuit, or signal noise in the engine coolant temperature sensor circuit.Inspect sensor wiring harness for damage and check connector pins for corrosion; verify sensor resistance against factory specifications.
218 HYD PMPHydraulic Pump Pressure FaultAbnormal pressure readings from the main hydraulic pump sensor or relief valve malfunction.Check hydraulic fluid level and condition; inspect pump pressure sensor wiring and connections.
300 EC1 CANECU 1 CAN Bus Communication ErrorLoss of communication between the Engine Control Unit and the machine display or other modules.Verify CAN bus termination resistors and wiring integrity; check ECU power and ground connections.
P0100Air Mass Flow Sensor Circuit MalfunctionFault in the intake air mass flow sensor circuit or sensor itself.Inspect the air filter and intake ducting for blockages; check sensor electrical connections and wiring.
P0101Air Mass Flow Sensor Range/Performance FaultSensor signal is out of expected range, often due to dirty sensor or intake leaks.Clean the air mass flow sensor element; inspect intake system for vacuum leaks or restrictions.
P0335Crankshaft Position Sensor 'A' Circuit No SignalOpen circuit, short to battery, or sensor failure preventing engine speed detection.Check the crankshaft position sensor gap and wiring; verify sensor signal output with a diagnostic tool.
P0336Crankshaft Position Sensor Circuit Range/PerformanceSignal irregularity from the crankshaft position sensor, possibly due to a damaged tone wheel.Inspect the crankshaft sensor and tone wheel for damage or debris; check sensor alignment.
P029BInjector Drift Fault (Injector 2)Injector 2 mechanical drift exceeds calibrated limits, affecting fuel delivery.Perform injector balance test; inspect injector 2 wiring and connector for high resistance.
P0321CAN Bus Message Error for Engine SpeedInvalid or missing engine speed data received via the CAN bus from the engine ECU.Check CAN bus wiring for shorts or opens; verify engine ECU is sending valid speed data.
P0340Camshaft Position Sensor Signal Out of LimitsCam signal last learned value is outside calibrated limits, indicating sensor or timing issue.Check camshaft position sensor wiring and connector; verify camshaft timing alignment.

Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.

COMPACT II 5108 attachments & work tools

Buckets

JCB offers a range of buckets designed for material handling and excavation tasks. These tools are engineered to connect easily to JCB skid steers and compact track loaders, allowing operators to shift between grading, digging, and material moving applications efficiently.

Breakers

The OEM hydraulic breaker range includes compact, medium, large, and contractor models designed to work with excavator and breaker carrier machines. These units enable the operator to break up frozen or compacted earth surfaces, concrete, and tarmac.

Augers and Drills

Augers and drills are available as work tools to enhance machine versatility for various job site tasks. These attachments allow the base machine to perform specialized drilling operations alongside standard loading and digging duties.

Forks

Pallet forks are provided for material handling applications, enabling the loader to move pallets on a job site. These tools complement the machine's ability to handle diverse tasks with a single carrier.

Tree Spades

The Tree Spade transforms the machine into a high-speed, labor-saving transplanting unit capable of digging, loading, and transporting trees. It features a 25-inch cutting angle that allows for operation in confined areas.

Rippers

Ripper teeth are fabricated units that enable the operator to break up frozen or compacted earth surfaces, as well as concrete or tarmac. JCB offers high flow and standard flow models in 36-inch or 48-inch dig depths to suit various trenching applications.

Lifting Equipment

The lifting equipment range provides safe handling of suspended loads with a compact design that improves operator visibility. These tools utilize a Q-Fit pick-up system to ensure they are easy to attach to the machine.

Coupler Systems

Work tools attach to the base machine using a coupler or quick coupler system. JCB attachments are designed to connect easily to JCB skid steers and compact track loaders, facilitating quick task changes on the job site.

All COMPACT II 5108 assemblies by section

Every catalogued assembly group for the Jcb COMPACT II 5108. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

A Portable Power Packs
A0-1-1 Machine & Engine, Identification
PP***90Engine, Robin Dy35, Diesel1
PP***57Engine, Lombardini, 530 Series1
PP***14Engine, Honda, 10 Hp G400 Qzdf1
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A0-1-3 Machine & Engine, Identification
92***01Engine, Honda, 8hp Gx2401
92***01Engine, Yanmar (Diesel), L70 Ae-D 7hp1
92***01Engine, Suzuki, V2701
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A0-1-4 Machine & Engine, Identification
92***01Engine, Honda, Gx390 Qx1
PP***90Engine, Robin Dy35, Diesel1
PP***16Engine, Robin Dy35, Diesel1
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A0-1-2 Machine & Engine, Identification
92***02Engine, Honda, 5.3hp Gx160k 1 Qx1
PP***00Engine, Honda, 5 Hp Gx140 Qx1
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A1-5-9 Chassis
13***5ZScrew, Hexagon M8 X 20mm Long0
13***9ZBolt, M8 X 35mm0
13***9ZBolt, M10 X 350
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A1-5-14 Chassis, Conversion Kit, Mk Ii To Mk Iii
13***8ZBolt, M10 X 304
13***0ZBolt, M10 X 404
13***2ZBolt, Bolt; Qty Was 1 Off Before New Plate. Old Fasteners Were 13***8z X 2 & 13***2z X 12
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A1-5-11 Chassis
13***0ZBolt0
13***3ZScrew, M6x160
13***9ZBolt, M8 X 35mm0
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A1-5-7 Chassis
13***0ZBolt0
13***2ZBolt0
13***9ZBolt, M8 X 35mm0
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A1-5-10 Chassis
13***0ZBolt0
13***0ZBolt0
13***9ZBolt, M8 X 35mm0
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A1-5-8 Chassis
13***7ZScrew, Hexagon M8 X 250
13***9ZBolt, M10 X 350
13***7ZBolt0
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A1-5-4 Chassis & Frame
13***07Bolt0
13***7ZBolt, M10x252
13***8ZBolt, M10 X 302
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A1-5-6 Chassis
13***0ZBolt0
13***2ZBolt0
13***9ZBolt, M8 X 35mm0
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A1-5-13 Chassis
13***8ZBolt, M10 X 300
13***0ZBolt, M10 X 400
13***2ZBolt, Bolt; Qty Was 1 Off Before New Plate. Old Fasteners Were 13***8z X 2 & 13***2z X 10
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A1-5-15 Chassis
13***8ZBolt, M10 X 304
13***0ZBolt, M10 X 402
13***2ZBolt, Bolt; Qty Was 1 Off Before New Plate. Old Fasteners Were 13***8z X 2 & 13***2z X 13
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A1-5-12 Chassis
13***0ZBolt0
13***0ZBolt0
13***9ZBolt, M8 X 35mm0
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A2-1-6 Pump, Hydraulic, Single
13***4ZScrew, Grub0
13***09Capscrew, M6 X 350
14***15Washer, Seal; Replaces Khj08910
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A2-1-5 Pump, Hydraulic, Single
13***4ZScrew, Grub0
13***09Capscrew, M6 X 350
14***18Seal, Bonded, 1/2" Bsp1
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A2-1-9 Pump, Hydraulic
13***4ZScrew, Grub0
13***09Capscrew, M6 X 350
14***18Seal, Bonded, 1/2" Bsp0
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A2-1-2 Pump, Hydraulic, Single
13***03Screw, Grub, M8 X 10mm0
13***08Capscrew4
13***10Capscrew0
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A2-1-10 Pump, Hydraulic, Single
13***04Screw, Grub0
13***09Capscrew, M6 X 350
14***18Seal, Bonded, 1/2" Bsp0
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A2-1-8 Pump, Hydraulic
13***4ZScrew, Grub0
13***08Capscrew0
14***18Seal, Bonded, 1/2" Bsp0
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A2-1-7 Pump, Hydraulic
13***1ZScrew, Grub0
13***08Capscrew0
14***18Seal, Bonded, 1/2" Bsp0
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A3-1-9 Valve, Relief
13***8ZBolt, M8x80mm Long0
14***18Seal, Bonded, 1/2" Bsp0
16***04Adapter, Male/Female0
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A3-1-6 Valve, Control
14***15Washer, Seal; Replaces Khj08910
14***18Seal, Bonded, 1/2" Bsp0
14***6ZWasher, M60
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A3-1-7 Valve, Control
13***2ZCapscrew, M6 X 500
14***15Washer, Seal; Replaces Khj08910
14***18Seal, Bonded, 1/2" Bsp0
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A3-1-8 Valve Assembly
13***2ZCapscrew, M6 X 500
14***11Seal, Bonded0
14***15Washer, Seal; Replaces Khj08910
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A3-1-11 Valve Assembly
13***3ZCapscrew0
13***2ZCapscrew, M6 X 500
14***15Washer, Seal; Replaces Khj08910
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A3-1-4 Valve, Control
13***7ZBolt, M10x250
13***05Screw, Cap0
14***15Washer, Seal; Replaces Khj08910
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A3-1-10 Valve, Manual
13***8ZBolt, M8x80mm Long0
14***18Seal, Bonded, 1/2" Bsp0
16***04Adapter, Male/Female0
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A4-3-2 Hydraulic Circuit, Solite
14***18Seal, Bonded, 1/2" Bsp0
22***06Clip, Jubilee0
9***9Hose, Pump Suction0
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A4-3-16 Hydraulic Circuit, Beaver Ii & Iii
14***15Washer, Seal; Replaces Khj08910
14***18Seal, Bonded, 1/2" Bsp0
14***21Seal, Bonded 3/4" Bsp0
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A4-3-9 Hydraulic Circuit, Trojan I
14***18Seal, Bonded, 1/2" Bsp0
14***21Seal, Bonded 3/4" Bsp0
22***06Clip, Jubilee0
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A4-3-11 Hydraulic Circuit, Trojan Ii
14***15Washer, Seal; Replaces Khj08910
14***18Seal, Bonded, 1/2" Bsp0
14***21Seal, Bonded 3/4" Bsp0
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A4-3-7 Hydraulic Circuit, Beaver Ii
14***15Washer, Seal; Replaces Khj08910
14***18Seal, Bonded, 1/2" Bsp3
14***21Seal, Bonded 3/4" Bsp0
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A4-3-10 Hydraulic Circuit, Trojan Ii
13***06Nut0
14***15Washer, Seal; Replaces Khj08910
14***18Seal, Bonded, 1/2" Bsp0
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A4-3-15 Hydraulic Circuit, Compact Ii
14***18Seal, Bonded, 1/2" Bsp0
14***21Seal, Bonded 3/4" Bsp0
16***04Adapter, Male/Female0
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A4-3-5 Hydraulic Circuit, Compact I & Beaver I
14***18Seal, Bonded, 1/2" Bsp0
22***06Clip, Jubilee0
61***00Hose, 1/2"Bsp X 320mm0
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A4-3-13 Hydraulic Circuit, Compact Ii
14***18Seal, Bonded, 1/2" Bsp0
16***04Adapter, Male/Female0
22***06Clip, Jubilee0
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A4-3-17 Pressure Gauge, Beaver
92***01Adapter, Tee0
92***02Connector0
A2***58Panel, Gauge0
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A5-1-6 Tank, Hydraulic
13***8ZBolt0
13***3ZScrew, M6x160
13***5ZBolt0
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A5-1-9 Tank, Hydraulic
13***6ZBolt, 5/16"Unf X 1" Long0
13***5ZBolt0
13***8ZScrew, M8x300
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A5-1-4 Fan Housing
13***06Bolt0
13***3ZBolt0
13***03Bolt0
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A5-1-2 Tank & Filter, Hydraulic
13***2ZBolt0
13***03Nut0
13***05Screw, Cap0
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A5-1-10 Tank, Hydraulic
13***0ZBolt0
13***3ZScrew, M6x160
13***5ZBolt0
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A5-1-8 Tank, Hydraulic
13***6ZBolt, 5/16"Unf X 1" Long0
13***6ZBolt4
13***5ZBolt0
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A5-1-3 Fan Housing
13***05Bolt0
13***06Bolt0
13***03Bolt0
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A5-1-11 Tank, Hydraulic
13***0ZBolt0
13***3ZScrew, M6x160
13***5ZBolt0
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A5-1-7 Tank, Hydraulic
13***0ZBolt0
13***3ZScrew, M6x160
13***5ZBolt0
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A6-1-14 Ram, Power On Demand, Beaver Iii Lobardini, Models 929/17200 & 929/18000
14***15Washer, Seal; Replaces Khj08910
92***00Ram, Power On Demand0
92***03Link, Spring0
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A6-1-2 Ram, Power On Demand
13***3ZNut0
13***2ZNut; Replaces 162l006vr, San 123520
13***0ZCapscrew0
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A6-1-9 Ram, Power On Demand, Beaver I,Ii & Iii, Honda Engine Models
14***15Washer, Seal; Replaces Khj08910
92***00Ram, Power On Demand0
A2***49Pipe, Bundy0
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A6-1-17 Ram, P.O.D.
13***1ZNut2
24***03O Ring1
33***94Ram Cylinder (P.O.D.1
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A6-1-11 Ram, Power On Demand, Trojan I Diesel
13***02Nut0
13***09Capscrew, M6 X 350
14***18Seal, Bonded, 1/2" Bsp0
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A6-1-7 Ram, Power On Demand
13***5ZBolt, M5 X 20mm Long0
13***3ZScrew, M6x160
14***15Washer, Seal; Replaces Khj08910
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A6-1-12 Ram, Power On Demand, Trojan Ii Diesel
14***08Seal, Washer0
14***15Washer, Seal; Replaces Khj08910
16***01Adapter0
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A6-1-8 Ram, Power On Demand
13***3ZScrew, M6x160
13***02Nut0
13***09Capscrew, M6 X 350
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A6-1-5 Ram, Power On Demand
13***3ZScrew, M6x160
13***02Nut0
13***09Capscrew, M6 X 350
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A6-1-10 Ram, Power On Demand, Beaver Ii & Iii, Yanmar Engine Models
13***4ZCapscrew0
14***15Washer, Seal; Replaces Khj08910
14***6ZWasher, M60
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A6-1-6 Ram, Power On Demand
14***15Washer, Seal; Replaces Khj08910
14***02Screw1
92***00Ram, Power On Demand0
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A6-1-15 Ram, Power On Demand, Beaver Iii Suzuki, Model 929/16600
14***15Washer, Seal; Replaces Khj08910
92***00Ram, Power On Demand0
92***02Bracket, Mounting0
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A6-1-13 Ram, Power On Demand, Trojan I & Ii Petrol
14***15Washer, Seal; Replaces Khj08910
92***00Ram, Power On Demand0
92***09Bracket, Mounting0
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A6-1-16 Ram, Power On Demand, Compact Iii
14***15Washer, Seal; Replaces Khj08910
92***00Ram, Power On Demand0
A2***27Pipe, Bundy0
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A6-1-4 Ram, Power On Demand
13***02Nut0
13***09Capscrew, M6 X 350
14***18Seal, Bonded, 1/2" Bsp0
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A6-1-1 Ram, Power On Demand
13***2ZNut; Replaces 162l006vr, San 123520
13***05Screw, Cap0
13***09Capscrew, M6 X 350
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A9-1-6 Battery & Components, Trojan I, Models 929/02800, 929/03400
13***1ZSetscrew, M6 X 12mm Long0
13***3ZNut0
14***5ZWasher, M5; Replaces 69***590
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A9-1-5 Battery & Components, Trojan I, Model 929/02600 Only
13***1ZSetscrew, M6 X 12mm Long0
13***9ZBolt0
13***10Screw, Cap0
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A9-1-3 Battery & Components, Solite 5063
13***5ZBolt0
13***3ZNut0
14***5ZWasher, M5; Replaces 69***590
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A9-1-4 Battery & Components, Solite 5080
13***03Bolt0
13***10Screw, Cap0
14***6ZWasher, M60
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A9-1-9 Battery & Components, Beaver Iii
12***03Tie, Cable, L=300mm X W=7.6mm0
13***4ZBolt, M6 X 600
13***5ZBolt, M6 X 350
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A9-1-2 Battery & Components, Solite 5060
13***5ZBolt0
13***3ZNut0
14***5ZWasher, M5; Replaces 69***590
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A9-1-7 Battery & Components, Trojan Ii 20 Litre, Models 929/02600, 929/02800
13***1ZSetscrew, M6 X 12mm Long0
13***03Nut0
14***5ZWasher, M5; Replaces 69***590
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A9-1-8 Battery & Components, Trojan Ii 30 Litre, Model 929/03400 Only
13***1ZSetscrew, M6 X 12mm Long0
13***3ZNut0
14***5ZWasher, M5; Replaces 69***590
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B Handheld Attachments
B4-2-1 Valve Control, Chainsaw
13***2PScrew, Cap0
14***15Washer, Seal; Replaces Khj08910
14***18Seal, Bonded, 1/2" Bsp0
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B4-2-2 Valve, Control, Disc Cutter
13***01Screw, Grub, Cutting Disc0
13***2PScrew, Cap0
14***15Washer, Seal; Replaces Khj08910
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B4-3-2 Disc Cutter 5024
13***03Screw, Cap0
14***09Washer, M12, Plain0
14***05Washer, 'S'0
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B4-3-1 Chainsaw Model 5023
5***3Tool, Chain Saw, Complete0
A3***50Guard0
A3***73Guard, Hand0
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B4-1-1 Motor Drive, Disc Cutter/Chainsaw, Models 5023, 5024
13***2ZCapscrew, M5 X 120
9***1Kit-Seal1
9***3Kit-Seal1
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B4-3-3 Chassis, Disc Cutter/Chainsaw, Models 5023, 5024
13***05Bolt0
13***01Screw, Cap0
13***05Screw0
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B5-3-1 Drill Bits, & Accessories
99***01Bit, Drill1
99***02Bit, Drill1
99***03Bit, Drill1
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B5-2-1 Drill, Rotary Percussive, Model 5020
13***07Screw, Cap0
14***15Washer, Seal; Replaces Khj08910
14***7ZWasher, Spring0
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B5-1-1 Motor & Valve, Drill, Rotary Percussive, Model 5020
13***02Capscrew, M5 X 120
14***15Washer, Seal; Replaces Khj08910
14***05Washer, 'S'0
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B6-1-10 Breaker, Jcb 26kg, 20 & 30 Litre, Standard
14***15Washer, Seal; Replaces Khj08910
14***18Seal, Bonded, 1/2" Bsp0
21***5ZPin, Tension0
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B6-2-3 Breaker Steels, 25mm (1") Shank
PP***11Tool, Chisel, 22kg0
PP***12Tool, Asphalt Cutter, 22kg0
PP***13Tool, Rammer Pad Stem0
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B6-2-2 Breaker Steels, 22mm (7/8") Shank
PP***58Tool, Chisel, 1 Inch (25mm) Wide0
PP***20Tool, Rammer Stem0
PP***21Tool, Tarmac Cutter 5"0
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B6-1-11 Breaker, Jcb 28kg, 20 & 30 Litre, Flexi-Handles
14***15Washer, Seal; Replaces Khj08910
14***18Seal, Bonded, 1/2" Bsp0
92***41Housing1
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B6-1-13 Demolition Pick Jcb
14***15Washer, Seal; Replaces Khj08910
14***18Seal, Bonded, 1/2" Bsp0
92***08Screw, Charging0
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B6-1-12 Breaker, Stanley, Br67
12***00Breaker, Road0
12***01Handle0
12***02Grab0
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B6-1-1 Breaker, Krupp Hm25, Models 995/36400, 5078
13***19Capscrew, M16x90, Grade 12.91
14***15Washer, Seal; Replaces Khj08910
21***03Dowel0
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B6-1-6 Pick, 'T' Handle, Krupp Hm12e, Model 5083
13***11Screw, Cap4
14***15Washer, Seal; Replaces Khj08910
5***9Kit-Hose0
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B6-1-4 Pick, Demolition, Krupp Hm12b, Model 5075
13***11Screw, Cap4
14***15Washer, Seal; Replaces Khj08910
5***9Kit-Hose0
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B6-1-8 Breaker, Jcb 20kg, & Hi Power 23kg, Standard
14***15Washer, Seal; Replaces Khj08910
14***18Seal, Bonded, 1/2" Bsp0
21***5ZPin, Tension1
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B6-1-7 Breaker 25 Kg, Npk H-55
14***15Washer, Seal; Replaces Khj08910
5***9Kit-Hose0
92***00Tool, Breaker H-550
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B6-1-14 Handles, Demolition Pick
14***7ZWasher, Plain, M8; Replaces Khn1550, San 126204
92***32Handle, 'D'1
92***33Handle, 'T'1
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B6-2-1 Breaker Steels, 32mm (1 1/4") Shank
99***14Pad, Rammer0
99***15Tool, Moil, Tool, Moil; 380mm Long Below Collar. 160mm (6 1/4") Long Above Collar0
99***16Tool, Chisel, Narrow0
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B6-1-9 Breaker, Jcb 22kg, & Hi-Power 23kg, Flexi-Handles
14***15Washer, Seal; Replaces Khj08910
14***18Seal, Bonded, 1/2" Bsp0
92***00Breaker, Assembly, 22kg, Flexi - Handles1
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B7-2-1 Pump, Submersible, & Discharge Hose, 1000 Lbf/In2 (69 Bar)
13***5ZBolt, Star Drive, M8 X 65mm0
13***02Nut0
13***8ZCapscrew0
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B7-3-1 Pump, Submersible, & Discharge Hose, 2000 Lbf/In2 (138 Bar)
13***5ZBolt, Star Drive, M8 X 65mm0
13***02Nut0
13***8ZCapscrew0
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B7-4-1 Pump, Submersible, & Discharge Hose, 2000lbf/In2 (138 Bar)
13***5ZBolt, Star Drive, M8 X 65mm0
13***02Nut0
13***8ZCapscrew0
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B8-1-1 Circuit, Lighting
9***7Kit, Lighting Circuit1
PP***32Screw, Button Head1
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B8-1-2 Circuit, Lighting
92***00Kit, Lighting Circuit1
PP***32Screw, Button Head1
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B9-1-1 Auger, Earth
13***4ZScrew, Grub0
33***78Adapter, Pin1
33***92Adapter, Assembly1
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B10-5-1 Valve Assembly
92***04Valve, Assembly0
92***96Handle, Twist Grip0
92***97Housing, Valve0
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B10-2-1 Impact Mechanism
92***01Gearbox, Impact0
92***27Seal, Oil0
92***28Housing, Front0
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B10-1-1 Impact Wrench, 1" Square Drive
14***15Washer, Seal; Replaces Khj08910
92***00Wrench, Impact0
92***10Handle, Top0
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B10-3-1 Motor Assembly
92***02Motor, Assembly0
92***54Motor0
92***55Housing, Motor0
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B10-4-1 Rear Plate Assembly
92***03Plate, Assembly, Rear0
92***77Plate, Rear0
92***78Plug0
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Frequently asked questions

What engine does the JCB COMPACT II 5108 use?

The machine uses a JCB DieselMax or EcoMAX engine. These engines operate without Diesel Exhaust Fluid (DEF) or Selective Catalytic Reduction (SCR) systems, allowing for extended 500-hour engine oil intervals.

What is the operating weight of the JCB COMPACT II 5108?

Operating weight varies by configuration and series. The broader compact excavator range spans from 1.8 to 10 tons. Specific models in the line, such as the 86C-2, have an operating weight of approximately 19,180 lb. Verify the exact weight for your serial range with the dealer.

What model replaced the JCB COMPACT II 5108?

The COMPACT series lineage includes the 801 Gravemaster as a predecessor and the 18Z through 100C series as successors. The specific successor to the COMPACT II 5108 depends on the exact serial range and market configuration; consult the dealer for the direct replacement model in your region.

What COMPACT II 5108 owners discuss

What are the typical powertrain and hydraulic behaviors reported for the JCB COMPACT II 5108?
Operators report that the machine relies on a direct independent hydraulic drive system with no rear axle, providing work and travel traction modes. Common hydraulic issues include loss of power, slow or jerky movements, and lack of flow to attachments, often caused by clogged hydraulic filters or worn pumps. The system utilizes O-Ring Face Seal (ORFS) fittings for sealing. If the drive chains are loose, they can hammer the motors and other drive components, leading to premature failure.
What undercarriage and wear patterns are typical for this machine type?
The machine features a heavy-duty, fully welded H-frame undercarriage. Typical wear patterns include worn tracks, misaligned undercarriage components (sprockets and idlers), and dry undercarriage joints. Operators must regularly inspect tracks for wear and ensure proper tensioning to maintain traction. Greasing pivot points, bushings, and joints is critical to prevent premature wear and maintain performance.
What engine quirks are associated with this series?
Engine issues often manifest as difficulty starting, gradual loss of power, or unusual noises such as deep, rhythmic knocking under load. Common causes include clogged radiators, malfunctioning cooling systems, faulty starter motors, and fuel system faults. The engine requires regular coolant checks to prevent silicate separation, which can cause brown sludge in the expansion bottle and lead to overheating.
What are common electrical and sensor issues?
Electrical problems frequently cause intermittent power loss or malfunctioning controls. Specific issues include dead or low-voltage batteries, corroded electrical wires, and faulty wiring harnesses. On similar JCB models, the forward/reverse lever operates microswitches that activate hydraulic solenoids; failure of these switches can result in the machine revving up but not moving in the selected direction. Wiring harnesses in some JCB skid steer variants are noted for being white and prone to damage.
What should be checked when buying a used COMPACT II 5108?
Verify drive chain tension, as loose chains damage motors. Inspect the hydraulic system for leaks and check the hydraulic filter condition. Examine the electrical wiring harness for frayed wires or loose connections. Check battery voltage and power output. Inspect the undercarriage for worn tracks and misaligned sprockets or idlers. Ensure the radiator is clean and free of debris, and check for brown sludge in the coolant expansion bottle indicating silicate separation.
What fluid specifications are recommended for routine maintenance?
Use JCB branded fluids verified for use, or equivalent alternatives. Recommended fluids include JCB 15W/40 Multigrade engine oil (for temperatures -10°C to 50°C), JCB Super Universal Agricultural fluid for transmissions/hydraulics (for temperatures -15°C to 30°C), and OAT JCB coolant. Genuine JCB hydraulic oil features high-quality base oils and advanced additive technology filtered to higher than industry standards.
What safety-critical fixes require dealer verification?
Diagnosing and repairing complex hydraulic solenoid activations, replacing damaged wiring harnesses, and addressing engine knocking or cooling system silicate separation issues should be verified by your dealer. Have your dealer verify the exact serial range specifications and installed attachment package to ensure correct fluid capacities and component fitment.

Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.

Serial-range & configuration variants

This page covers the Jcb COMPACT II 5108. Related factory variants of the same model family:

COMPACT II 5108COMPACT II 5108

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