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Jcb G45QX(JCB GENERATOR)

Maintenance schedule, common problems & OEM parts breakdown

The JCB G45QX is a diesel-powered generator set within the JCB G-series range, designed for primary and standby power applications. The machine utilizes a JCB Dieselmax or Sisu diesel engine, depending on the specific serial range and production year. Operating weights vary by configuration, typically ranging from 4,500 kg to 5,500 kg (9,921 to 12,125 lb) for the G45 class. Production years for the G45QX generally fall between 2009 and 2018, covered by operator manual publication the OEM part reference. The G45QX is part of the G8X to G45QX family lineage, often succeeded by the G60RX series in the power spectrum. Configurations offered include open skid-mounted units and sound-attenuated enclosures, with control options including KS1 digital panels or CP1/CP2 digital control panels.

Across the G-series generations, the primary change has been the transition from older mechanical fuel injection systems to modern common-rail engines with integrated electronic control units (ECUs). Early G-series units may have utilized Sisu or Scania engines, while later G45QX models often feature JCB Dieselmax engines to meet stricter emissions standards without DEF. The G45QX remains relevant in the used market due to its robust Dieselmax powertrain and the availability of standardized alternator components. Its modular design allows for easier engine swaps and maintenance compared to earlier fixed-frame generator sets, making it a cost-effective option for rental fleets and industrial backup power where reliability is prioritized over compact footprint.

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 G45QX(JCB GENERATOR) specifications

Engine

ModelJCB by Kohler KDI 2504 TM
Configuration4-Cylinder, Mechanical Governor
DisplacementNot documented for this exact serial range — verify with your dealer
Emissions TierNot documented for this exact serial range — verify with your dealer

Weights

Operating Weight1000 kg (2205 lb)

Dimensions

Transport Length225 cm (7.38 ft)
Transport Width84 cm (2.76 ft)
Transport Height135 cm (4.43 ft)

Performance

Standby Rating (50 Hz)44.8 kVA / 35.8 kW
Prime Rating (50 Hz)40.7 kVA / 32.5 kW
Current Output64 A per phase

Service capacities (summary)

Fuel Tank81 L (bundled, integrated)
Hydraulic SystemNot documented for this exact serial range — verify with your dealer
Engine OilNot documented for this exact serial range — verify with your dealer
Cooling SystemNot documented for this exact serial range — verify with your dealer

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

Jcb G45QX(JCB GENERATOR) maintenance schedule

Service intervalTasks
Every 10 h
  • Check engine oil level via dipstick.
  • Check hydraulic oil level via sight gauge.
  • Check coolant level in expansion tank.
  • Check fuel level and drain water separator.
  • Inspect for fluid leaks around engine and chassis.
  • Verify battery electrolyte level and terminal tightness.
Every 250 h
  • Inspect drive belt tension and condition.
  • Check air filter restriction indicator.
  • Inspect radiator fins for debris blockage.
  • Check all grease points on engine mounts and alternator.
  • Inspect fuel lines for chafing or leaks.
  • Verify operation of all warning lights and gauges.
Every 500 h
  • Replace engine oil and oil filter.
  • Replace primary and secondary fuel filters.
  • Replace hydraulic return filter element.
  • Replace air filter primary element.
  • Take oil samples from engine, hydraulic, and axle systems.
  • Grease all pivot points on engine and alternator mounts.
Every 1,000 h
  • Replace engine coolant and flush system.
  • Replace transmission oil and filter (if equipped).
  • Inspect turbocharger shaft play and boot condition.
  • Perform ECM diagnostic scan for logged fault codes.
  • Inspect alternator and starter load performance.
  • Check all electrical connections for corrosion and tightness.
Every 2,000 h
  • Replace hydraulic oil and clean hydraulic tank.
  • Inspect structural chassis for cracks or welding defects.
  • Measure swing ring play and backlash (if applicable).
  • Inspect injector spray patterns and replace as required.
  • Check brake disc wear and fluid levels.
  • Inspect all hoses and fittings for hardening or swelling.

Servicing the G45QX(JCB GENERATOR) beyond the schedule

Predictive Maintenance & Fluid Analysis

At the 500-hour interval, take oil samples from the engine, hydraulic tank, and axle systems to establish a baseline. Monitor for rising silicon levels indicating air filter leaks or copper wear signaling bearing degradation. The JCB Dieselmax engine relies on strict oil cleanliness; use JCB Engine Oil Special or equivalent 15W-40 diesel oil meeting API specifications. Regular fluid analysis prevents premature injector failure and extends the 500-hour oil change interval safely. Track hydraulic oil viscosity changes to detect coolant ingress or fuel dilution before catastrophic pump failure occurs.

Corrective & Common Repairs

Common repairs on the G45QX involve replacing the primary and secondary fuel filters at 500 hours to protect common-rail injectors. Inspect the alternator BC or UC range brushes and slip rings for wear during the 1000-hour service. Check the KS1 or CP1/CP2 control panel wiring for corrosion, especially in the connector pins. Replace drive belts if tension drops below specification. Address turbocharger boot leaks promptly to prevent unfiltered air ingestion. Verify the thermostat housing bolts and gasket integrity to prevent coolant loss, a frequent issue in high-hour units.

Overhaul & Rebuild Points

The 2000-hour interval marks the deep service point for the G45QX. Replace the hydraulic oil and thoroughly clean the hydraulic tank to remove sludge. Inspect the engine structural mounts for cracking. Measure the swing ring play if the generator is mounted on a rotating platform. Check injector spray patterns and replace any nozzles showing leakage or poor atomization. Inspect the alternator windings for insulation breakdown. If the engine has exceeded 10,000 hours, consider a major overhaul including piston rings, valve seats, and turbocharger rebuild based on oil analysis trends.

Seasonal & Environment Servicing

In cold climates, check the coolant freeze point before winter. Ensure the fuel water separator is drained daily to prevent gelation or ice blockage. In dusty environments, inspect the air filter restriction indicator more frequently than the standard 500-hour interval. Clean radiator fins regularly to maintain heat rejection. In coastal areas, inspect all electrical connections and the KS1/CP1 control panel for salt corrosion. Apply grease to all pivot points after exposure to salt spray. Verify the sound-attenuated enclosure seals are intact to prevent moisture ingress into the alternator and control systems.

G45QX(JCB GENERATOR) common service parts

Part numberPart
02/971534Element, Fuel Filter, Cartridge TypeCheck fitment →
02/971542Filter, Element, FuelCheck fitment →
332/Z1631Kit, Fuel Filter Racor, 4tnv98/98t Gge Ins + DecCheck fitment →
02/971620Filter, FuelCheck fitment →
02/971616Filter, FuelCheck fitment →

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

G45QX(JCB GENERATOR) fault codes & troubleshooting

CodeMeaningLikely causeWhat to do
P0087Too low pressure in the fuel line / systemFuel supply restriction, failing lift pump, or clogged filterCheck fuel filter condition and fuel line integrity for leaks or blockages
P0088Too high pressure in the fuel line / systemFaulty fuel pressure regulator or restricted return lineInspect fuel pressure regulator operation and return line flow
P0115Circuit 1, engine coolant temperature sensorFaulty coolant temperature sensor (ECT) or wiring issueVerify sensor resistance values and inspect connector for corrosion
P0190Circuit “A” of the fuel pressure sensor in the highwayFaulty high-pressure fuel rail sensor or open circuitCheck sensor wiring harness and connector pins for damage
P0200Injector circuit openOpen circuit in injector wiring or connectorVisually inspect injector wiring harness for chafing or disconnection
P0335Crankshaft Position Sensor "A" Circuit / No SignalFailed crank sensor or damaged tone ringInspect crank sensor air gap and wiring continuity
P0336Torque Reduction Crank Sensor Fault (Signal Fault)Intermittent signal from crank position sensorCheck sensor mounting and signal integrity during operation
P0321-87CAN bus message error for engine speed from engine ECUCAN bus communication fault or ECU data lossInspect CAN bus wiring connections and termination resistors
203 EN TMPEngine Temperature Fault (EMS Electrical)Cooling system failure or temperature sensor faultCheck coolant level, thermostat operation, and sensor wiring
300 EC1 CANEMS Electrical CAN Communication FaultLoss of communication between EMS and ECUVerify CAN bus network integrity and connector seating

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

G45QX(JCB GENERATOR) attachments & work tools

Compact Range Generators

The G45QS is a compact generator with a Prime Power (PRP) of 40kVA and Standby Power (ESP) of 45kVA. It utilizes a total fuel capacity of 81 liters and is part of the JCB 4 Cylinder DIESELMAX or 6 Cylinder DIESELMAX powertrain family.

Mid Range Diesel Generators

The G40QX, G44QX, and G50QX models represent the mid-range heavy duty power systems. These units are powered by engines from Scania, Cummins, or Volvo and feature a total fuel capacity of 740 liters.

Rental Range Generators

The RS Range includes Tier 4 Final-compliant models designed for the rental market. The G40RS V offers a Prime Power of 40kVA (32kW) with a total fuel capacity of 226 liters.

All G45QX(JCB GENERATOR) assemblies by section

Every catalogued assembly group for the Jcb G45QX(JCB GENERATOR). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Z Jcb Generator Set
Jcb : G45qx(Jcb Generator) : Z Jcb Generator Set : Z00 Generator Sets
Z1-8-20 Flywheel Housing, & Sump
02***21Bolt, M8 X 353
02***52Bolt, M8 X 4524
02***07Dowel, .4
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Z1-6-10 Timing Case & Covers
02***18Housing1
02***86Nut3
02***06Bolt, M6 X 162
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Z1-3-20 Cylinder Block, Assembly
02***32Plug, .3
02***04Plug, .1
02***05Plug, .1
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Z1-4-10 Crankshaft, Bearings, Pistons & Con-Rods
02***07Dowel, .1
02***10Key, .1
02***21Gear, .1
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Z1-8-1 Flywheel Housing, & Sump
02***22Plug, M161
02***25Seal, Washer1
02***52Bolt, M8 X 4511
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Z1-4-50 Crankshaft, Bearings, Pistons & Con-Rods
02***10Key, .2
02***25Bolt, .1
02***50Bearing, Con Rod Std4
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Z1-6-20 Timing Case & Covers
02***18Housing1
02***86Nut3
02***06Bolt, M6 X 162
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Z1-4-1 Crankshaft, Bearings, Pistons & Con-Rods
02***04Key, 4 X 121
02***07Dowel, .4
02***26Bolt, .5
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Z1-8-10 Flywheel Housing, & Sump
02***21Bolt, M8 X 353
02***52Bolt, M8 X 4520
02***07Dowel, .4
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Z1-6-50 Timing Case & Covers
02***52Bolt, M8 X 453
02***06Bolt, M6 X 162
02***07Dowel, .4
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Z1-1-30 Engine, Assembly, 4tnv84tggeh
Z1-7-20 Camshaft, &, Gears
02***21Bolt, M8 X 403
02***05Tappet, .8
02***08Plate1
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Z1-6-1 Timing Case & Covers
02***84Bolt, M6 X 121
02***86Nut3
02***06Bolt, M6 X 166
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Z1-8-40 Flywheel Housing, & Sump
02***31Bolt, M8 X 1216
02***07Dowel, .2
02***46Plug, .1
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Z1-4-40 Crankshaft, Bearings, Pistons & Con-Rods
02***10Key, .1
02***25Bolt, .1
02***50Bearing, Con Rod Std4
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Z1-1-1 Engine, Assembly, 3tnv76ggeh
Z1-7-10 Camshaft, &, Gears
02***21Bolt, M8 X 403
02***05Tappet, .6
02***08Plate1
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Z1-7-30 Camshaft, &, Gears
02***21Bolt, M8 X 403
02***05Tappet, .8
02***08Plate1
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Z1-7-40 Camshaft, &, Gears
02***22Bolt, M8 X 553
02***59Bolt, M8 X 162
02***05Tappet, .8
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Z1-4-30 Crankshaft, Bearings, Pistons & Con-Rods
02***07Dowel, .1
02***10Key, .1
02***21Gear, .1
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Z1-3-30 Cylinder Block, Assembly
02***32Plug, .3
02***04Plug, .1
02***05Plug, .1
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Z1-8-50 Pump, Oil, Sump Extraction
33***58Pump, Sump Oil Extraction1
33***59Bracket, Oil Pump Support1
33***60Hose, Oil Extraction Pump1
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Z1-4-20 Crankshaft, Bearings, Pistons & Con-Rods
02***07Dowel, .1
02***10Key, .1
02***21Gear, .1
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Z1-1-40 Engine, Assembly, 4tnv98ggeh
Z1-3-1 Cylinder Block, Assembly
02***32Plug, .1
02***05Plug, .1
02***07Plug, 121
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Z1-1-50 Engine, Assembly, 4tnv98tggeh
Z1-7-50 Camshaft, &, Gears
02***22Bolt, M8 X 553
02***59Bolt, M8 X 162
02***05Tappet, .8
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Z1-1-10 Engine, Assembly, 3tnv88ggeh
Z1-6-40 Timing Case & Covers
02***52Bolt, M8 X 453
02***06Bolt, M6 X 162
02***07Dowel, .4
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Z1-1-20 Engine, Assembly, 4tnv88ggeh
Z1-3-10 Cylinder Block, Assembly
02***32Plug, .3
02***04Plug, .1
02***05Plug, .1
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Z1-3-40 Cylinder Block, Assembly
02***04Plug, .1
02***08Plug, 308
02***19Plug, .3
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Z1-3-50 Cylinder Block, Assembly
02***04Plug, .1
02***08Plug, 308
02***19Plug, .3
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Z1-7-1 Camshaft, &, Gears
02***84Bolt, M6 X 122
02***34Tappet6
02***35Rod, Push6
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Z1-6-30 Timing Case & Covers
02***86Nut3
02***06Bolt, M6 X 162
02***22Bolt, M8 X 5512
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Z2-1-10 Cylinder Head, & Rocker Assembly
02***21Bolt, M8 X 353
02***44Bolt, M8 X 252
02***59Bolt, M8 X 164
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Z2-1-30 Cylinder Head, & Rocker Assembly
02***44Bolt, M8 X 253
02***59Bolt, M8 X 164
02***29Cap, Filler1
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Z2-1-20 Cylinder Head, & Rocker Assembly
02***21Bolt, M8 X 354
02***44Bolt, M8 X 253
02***59Bolt, M8 X 164
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Z2-1-40 Cylinder Head, & Rocker Assembly
02***86Nut2
02***21Bolt, M8 X 402
02***30Stud, M8 X 222
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Z2-1-1 Cylinder Head, & Rocker Assembly
02***44Cap, Valve6
02***52Bolt, M6 X 203
02***21Bolt, M8 X 403
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Z2-1-50 Cylinder Head, & Rocker Assembly
02***31Bolt, M8 X 121
02***86Nut2
02***21Bolt, M8 X 402
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Z3-3-10 Air Induction, &, Air Filter
02***21Bolt, M8 X 402
02***49Clip, .2
02***97Gasket, .1
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Z3-2-30 Exhaust System
02***02Bolt, M8x224
02***10Gasket, Exhaust Manifold1
02***65Manifold, Exhaust1
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Z3-2-50 Exhaust System
02***32Bolt, M8 X 808
02***72Stud, M8 X 204
02***83Gasket, Exhaust Manifold1
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Z3-3-20 Air Induction, &, Air Filter
02***21Bolt, M8 X 402
02***49Clip, .2
02***97Gasket, .1
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Z3-3-30 Air Induction, &, Air Filter
02***21Bolt, M8 X 354
02***97Gasket, .1
02***00Element, Air Filter Safety1
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Z3-2-10 Exhaust System
02***86Nut2
02***02Bolt, M8x224
02***04Gasket, .1
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Z3-2-40 Exhaust System
02***86Nut2
02***02Bolt, M8x224
02***32Bolt, M8 X 806
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Z3-3-40 Air Induction, &, Air Filter
02***52Bolt, M8 X 458
02***21Bolt, M8 X 402
02***64Filter, Air1
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Z3-3-1 Air Induction, &, Air Filter
02***83Filter, Element, Main1
02***28Hose, Air Intake1
02***29Filter, Air Assembly1
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Z3-2-20 Exhaust System
02***86Nut2
02***02Bolt, M8x224
02***32Bolt, M8 X 806
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Z3-2-1 Exhaust System
02***02Bolt, M8x224
02***45Manifold, Exhaust1
02***46Gasket, Exhaust Manifold1
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Z3-3-50 Air Induction, &, Air Filter
02***52Bolt, M8 X 458
02***64Filter, Air1
02***22Bolt, M8 X 802
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Z4-1-50 Cooling Water System, Fan & Belt
02***31Bolt, M8 X 121
02***84Bolt, M6 X 121
02***52Bolt, M6 X 204
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Z4-1-40 Cooling Water System, Fan & Belt
02***31Bolt, M8 X 121
02***84Bolt, M6 X 121
02***52Bolt, M6 X 204
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Z4-1-30 Cooling Water System, Fan & Belt
02***31Bolt, M8 X 121
02***34Plug, Screw 1/8 Npt1
02***52Bolt, M8 X 451
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Z4-1-20 Cooling Water System, Fan & Belt
02***31Bolt, M8 X 121
02***34Plug, Screw 1/8 Npt1
02***52Bolt, M8 X 451
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Z4-1-10 Cooling Water System, Fan & Belt
02***31Bolt, M8 X 121
02***34Plug, Screw 1/8 Npt1
02***52Bolt, M8 X 451
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Z4-1-1 Cooling Water System, Fan & Belt
02***31Bolt, M8 X 121
02***48Bolt, M6 X 454
02***03Gasket, .1
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Z5-1-20 Engine, Lubrication, & Sump
02***16Nut, M61
02***21Bolt, M8 X 352
02***41Tube, Dipstick1
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Z5-1-10 Engine, Lubrication, & Sump
02***16Nut, M61
02***21Bolt, M8 X 352
02***41Tube, Dipstick1
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Z5-1-40 Engine, Lubrication, & Sump
02***31Bolt, M8 X 124
02***59Bolt, M8 X 161
02***41Tube, Dipstick1
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Z5-1-1 Engine, Lubrication, & Sump
02***19Bolt, M6 X 102
02***41Tube, Dipstick1
02***45Switch, Oil Pressure1
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Z5-1-50 Engine, Lubrication, & Sump
02***31Bolt, M8 X 121
02***41Tie, .1
02***59Bolt, M8 X 161
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Z5-1-30 Engine, Lubrication, & Sump
02***21Bolt, M8 X 352
02***41Tube, Dipstick1
02***42Gasket, .1
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Z6-1-50 Fuel Injection Pump
02***50Bolt, M10 X 201
02***59Bolt, M8 X 162
02***87O Ring, .1
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Z6-6-20 Fuel Pipes, &, Filters
02***76Clamp4
02***34Element, Fuel Filter, Cartridge Type1
02***40Pump, Assembly1
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Z6-3-10 Fuel System
02***16Clamp, Hose6
02***22Bolt, M4x144
02***23Pipe, Clamp2
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Z6-3-30 Fuel System
02***16Clamp, Hose2
02***50Seal, Washer1
02***21Pipe, Clamp2
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Z6-6-40 Fuel Pipes, &, Filters
02***16Clamp, Hose2
02***41Tie, .1
02***76Clamp3
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Z6-6-30 Fuel Pipes, &, Filters
02***76Clamp4
02***34Element, Fuel Filter, Cartridge Type1
02***40Pump, Assembly1
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Z6-2-40 Governor Assembly
02***25Seal, Washer1
02***78Bolt, M6 X 258
02***32Bolt, M6 X 402
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Z6-2-1 Governor Assembly
02***52Bolt, M6 X 142
02***19Bolt, M6 X 104
02***26Washer, Seal2
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Z6-3-1 Fuel System
02***76Clamp2
02***26Washer, Seal5
02***46Clamp, .2
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Z6-4-40 Kit, Fuel Tank To Filter, (Racor) 4tnv98
33***31Kit, Fuel Filter Racor, 4tnv98/98t Gge Ins + Dec1
33***32Filter, Racor1
33***33Tube0
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Z6-3-50 Fuel System
02***06Bolt, M6 X 162
02***21Pipe, Clamp1
02***22Bolt, M4x143
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Z6-1-1 Fuel Injection Pump
02***32Pump, Fuel Lift1
02***10Seal1
02***11Plate, Cover1
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Z6-1-40 Fuel Injection Pump
02***50Bolt, M10 X 201
02***59Bolt, M8 X 162
02***87O Ring, .1
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Z6-2-10 Governor Assembly
02***52Bolt, M6 X 2010
02***52Bolt, M6 X 146
02***21Cap, .1
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Z6-1-30 Fuel Injection Pump
02***59Bolt, M8 X 161
02***87O Ring, .1
02***26Washer, Seal5
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Z6-6-50 Fuel Pipes, &, Filters
02***16Clamp, Hose2
02***41Tie, .1
02***76Clamp3
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Z6-1-10 Fuel Injection Pump
02***59Bolt, M8 X 161
02***87O Ring, .1
02***26Washer, Seal5
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Z6-6-1 Fuel Pipes, &, Filters
02***76Clamp4
02***59Bolt, M8 X 162
02***26Washer, Seal2
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Z6-3-40 Fuel System
02***06Bolt, M6 X 162
02***21Pipe, Clamp1
02***22Bolt, M4x143
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Z6-6-10 Fuel Pipes, &, Filters
02***76Clamp4
02***34Element, Fuel Filter, Cartridge Type1
02***40Pump, Assembly1
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Z6-3-20 Fuel System
02***16Clamp, Hose8
02***22Bolt, M4x144
02***23Pipe, Clamp1
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Z7-2-1 Turbo Pipework
02***16Nut, M61
02***31Bolt, M8 X 121
02***06Bolt, M6 X 162
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Z7-2-10 Turbo Pipework
02***31Bolt, M8 X 124
02***06Bolt, M6 X 162
02***22Spring, Pin4
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Z7-1-10 Turbocharger
02***86Nut4
02***02Bolt, M8x224
02***00Turbocharger, Rhf51
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Z7-1-1 Turbocharger
02***86Nut5
02***70Turbocharger, Rhf41
02***71Gasket1
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Z8-1-50 Gasket Sets
02***03Gasket, .1
02***46Gasket, .2
02***38O Ring, .2
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Z8-1-20 Gasket Sets
02***03Gasket, .1
02***46Gasket, .2
02***32O Ring, .4
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Z8-1-30 Gasket Sets
02***03Gasket, .1
02***46Gasket, .2
02***32O Ring, .4
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Z8-1-10 Gasket Sets
02***03Gasket, .1
02***46Gasket, .2
02***32O Ring, .4
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Z8-1-1 Gasket Sets
02***25Seal, Washer1
02***03Gasket, .1
02***38Nozzle, Protection3
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Z8-1-40 Gasket Sets
02***03Gasket, .1
02***46Gasket, .2
02***38O Ring, .2
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Z10-1-20 Starter Motor
Z10-1-1 Starter Motor
02***15Motor, Starter1
33***74Screw, M10 X 252
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Z10-2-1 Alternator
02***87Timer, Fuel Cut-Off1
02***61Bolt, .1
02***62Spacer, .1
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Z10-1-10 Starter Motor
Z10-2-20 Alternator
Z60-5-10 Chassis, Frame & Components, Without Canopy
33***12Bracket, Mounting1
33***70Tank, Diesel Fuel1
33***71Frame, Cross1
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Z60-4-10 Chassis, Frame & Components, Without Canopy
33***12Bracket, Mounting1
33***70Tank, Diesel Fuel1
33***71Frame, Cross1
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Z60-3-1 Chassis
33***01Clamp3
33***06Meter, Flow1
33***12Bracket, Mounting1
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Z60-1-10 Chassis, Frame & Components, Without Canopy
33***12Bracket, Mounting1
33***70Tank, Diesel Fuel1
33***71Frame, Cross1
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Z60-5-1 Chassis
33***09Clamp3
33***10Silencer, Exhaust1
33***11Forklift, Pocket2
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Z60-1-1 Chassis
33***01Clamp3
33***02Pipe, End Silencer1
33***03Silencer, Exhaust1
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Z60-4-1 Chassis
33***01Clamp3
33***06Meter, Flow1
33***12Bracket, Mounting1
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Z60-3-10 Chassis, Frame & Components, Without Canopy
33***12Bracket, Mounting1
33***70Tank, Diesel Fuel1
33***71Frame, Cross1
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Z60-2-1 Chassis
33***01Clamp3
33***02Pipe, End Silencer1
33***03Silencer, Exhaust1
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Z60-6-1 Chassis
33***09Clamp3
33***14Frame, Canopy Support, Lower1
33***17Silencer, Exhaust1
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Z61-4-1 Canopy
33***51Cover1
33***53Dowel, Location2
33***60Grommet2
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Z61-1-1 Canopy
33***50Panel, Top1
33***51Cover1
33***52Panel, Side1
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Z61-3-1 Canopy
33***51Cover2
33***53Dowel, Location2
33***60Grommet2
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Z61-2-1 Canopy
33***51Cover1
33***53Dowel, Location2
33***56Hinge2
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Z62-6-1 Generator Alternator, Bci184g
32***07Kit, Rectifier1
32***08Regulator, A.V.R Sx4601
32***44Alternator1
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Z62-1-1 Generator Alternator, Bci164b
32***07Kit, Rectifier1
32***08Regulator, A.V.R Sx4601
33***24Bearing, Nde1
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Z62-4-1 Generator Alternator, Bci184e
32***07Kit, Rectifier1
32***08Regulator, A.V.R Sx4601
32***38Alternator1
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Z62-5-1 Generator Alternator, Bci184f
32***07Kit, Rectifier1
32***08Regulator, A.V.R Sx4601
32***80Alternator, Assembly1
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Z62-2-1 Generator Alternator, Bci164c
32***07Kit, Rectifier1
32***08Regulator, A.V.R Sx4601
33***24Bearing, Nde1
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Z62-3-1 Generator Alternator, Bci164d
32***06Alternator1
32***07Kit, Rectifier1
32***08Regulator, A.V.R Sx4601
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Z63-10-1 Kit, Conversion, Can/Usb
33***91Kit, Can/Usb Converter; Kit Consists Of: Cc/Usb Converter; Usb Cable; Db9 Connector;, Telecontrol Software; Configuration Software1
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Z63-1-1 Control Panel
33***32Key, Ignition1
33***25Unit, Control Panel Assembly1
33***28Panel, Front1
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Jcb : G45qx(Jcb Generator) : Z Jcb Generator Set : Z64 Generator Ac Power
Z66-4-1 Cables
33***38Battery, Cables, Yanmar 4tnv88/84t1
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Z66-1-1 Cables, & Isolator
33***29Kit, Battery Isolator, 11031
33***34Battery, Cables, Yanmar 3tnv1
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Z66-8-1 Cables, & Isolator
33***30Kit, Battery Isolator, 11091
33***38Battery, Cables, Yanmar 4tnv88/84t1
33***45Battery, Cables1
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Z66-11-1 Cables, Isolation Kit, & Bridge
33***30Kit, Battery Isolator, 11091
33***35Battery, Cables, Yanmar 4tnv98t1
33***42Bridge, Battery, With Isolator Kit1
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Z66-9-1 Cables, Isolation Kit, & Bridge
33***30Kit, Battery Isolator, 11091
33***37Battery, Cables, Yanmar 4tnv981
33***42Bridge, Battery, With Isolator Kit1
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Z66-2-1 Cables
33***40Battery, Cables, Yanmar 3tnv76/881
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Z66-3-1 Cables, & Isolator
33***29Kit, Battery Isolator, 11031
33***36Battery, Cables, Yanmar 4tnv88/84t/981
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Z66-6-1 Cables, Isolation Kit, & Bridge
33***29Kit, Battery Isolator, 11031
33***36Battery, Cables, Yanmar 4tnv88/84t/981
33***42Bridge, Battery, With Isolator Kit1
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Z66-7-1 Cables, & Isolator
33***29Kit, Battery Isolator, 11031
33***38Battery, Cables, Yanmar 4tnv88/84t1
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Z66-5-1 Cables, & Isolator
33***29Kit, Battery Isolator, 11031
33***38Battery, Cables, Yanmar 4tnv88/84t1
33***45Battery, Cables1
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Z66-10-1 Cables, Isolation Kit, & Bridge
33***30Kit, Battery Isolator, 11091
33***39Battery, Cables, Yanmar 4tnv981
33***42Bridge, Battery, With Isolator Kit1
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G45QX(JCB GENERATOR) serial number reference

Check the machine identification plate for the serial number. Confirm applicability with a JCB dealer.

PrefixIdentifies
1650000 onwardsApplicability: JCB G45QX generator set. Operator manual coverage for models G8X through G45QX.
1650000 onwardsApplicability: JCB G45QX generator set. Factory service and shop manual coverage for schematics, engines, alternators, control panels, and operator manuals.

Frequently asked questions

What engine does the JCB G45QX use?

The JCB G45QX uses a JCB Dieselmax or Sisu diesel engine, depending on the serial range and production year. Specific engine models are detailed in the service manual for serial numbers the OEM part reference–the OEM part reference and the OEM part reference onwards.

What is the operating weight of the G45QX?

Operating weight varies by configuration, typically ranging from 4,500 kg to 5,500 kg (9,921 to 12,125 lb) for the G45 class. Exact weights depend on the enclosure type, battery size, and fuel tank capacity.

What model replaced the G45QX?

The G45QX is part of the G8X to G45QX family. It is often succeeded by the G60RX series in the power spectrum, which covers higher power outputs. The G60RX to G115QX series uses operator manual the OEM part reference.

What G45QX(JCB GENERATOR) owners discuss

What engine configurations are associated with the JCB G45QX generator series?
The G45QX generator (serial range the OEM part reference onwards) utilizes Scania, Yanmar, or Dieselmax engines. Earlier serial ranges (the OEM part reference–the OEM part reference) utilized Deutz, Sisu, Scania, or Dieselmax engines. The specific engine installed varies by configuration and market region.
What are the common electrical issues reported for the G45QX control systems?
Operators report intermittent failures in the forward/reverse shuttle microswitches on related JCB powertrain controls, which can cause loss of drive or starting inhibition. For the G45QX generator, control panel faults are common in the Easygen and LeoPC systems (serial the OEM part reference–the OEM part reference) and CP1/CP2 or KS1 panels (serial the OEM part reference onwards). Wiring harness integrity and solenoid connections should be checked.
What maintenance is critical for the G45QX cooling system?
The thermostat is a non-serviceable item that must be renewed if faulty. Removal requires draining the coolant and disconnecting the radiator hose at the thermostat housing. The housing bolts must be undone to lift off the housing and extract the thermostat.
What alternator ranges are used in the G45QX generator?
The G45QX generator uses BC range alternators for serial numbers the OEM part reference–the OEM part reference and UC range alternators for serial numbers the OEM part reference onwards. HC range alternators are also referenced in service documentation.
What are the typical wear patterns or hydraulic behaviors for JCB power systems?
JCB powertrain systems, including those in the G45QX generator set, utilize hydraulic solenoids for directional control. Wear in shuttle linkages or microswitches can cause intermittent engagement. Hydraulic fluid contamination, indicated by metal filings in filters, suggests internal wear in pumps or motors.
What should be checked when buying a used G45QX generator?
Verify the serial number falls within the OEM part reference onwards range for current operator manuals (the OEM part reference series) or the OEM part reference–the OEM part reference for older schematics. Check the engine type (Scania, Yanmar, or Dieselmax) and ensure the control panel (CP1/CP2 or KS1) functions correctly.

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

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