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Jcb G90X(JCB GENERATOR)
Maintenance schedule, common problems & OEM parts breakdown
The JCB G90X is a compact diesel generator set in the 80-90 kVA class, designed for prime and standby power applications. It utilizes a JCB G-TC2 or Dieselmax 444 inline-4 diesel engine with a 4.4-liter displacement, paired with a Stamford UCI224G synchronous alternator. The unit weighs approximately 1110 kg in open configuration and measures 2150 x 780 x 1492 mm. It is available in open, canopy, and container configurations. The G90X is part of JCB's compact generator range, which also includes the G90QX variant.
The G90X series represents JCB's entry into the mid-range compact generator market, leveraging their heavy equipment engine heritage. Key changes across the G90X and G90QX lines involve enclosure options and control panel upgrades rather than fundamental powertrain alterations. The machine remains relevant in the used market due to its high torque density, fuel efficiency, and the availability of JCB Dieselmax engine parts, which are shared with JCB backhoe loaders and excavators. The G90X does not have a direct single-model successor in the compact range; it is part of a broader lineup that includes the G115X and G140X.
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 G90X(JCB GENERATOR) specifications
Engine
| Model | G-TC2 (per published references); Dieselmax 444 (per published references) |
| Configuration | 4 cylinders, in-line |
| Displacement | 4.4 L (per published references); 4.399 L (per published references) |
| Cooling | Liquid-cooled |
| Rated Speed | 1500 rpm |
| Engine Power (Max) | 74 kW (101 hp) |
Weights
| Operating Weight (Open Frame) | 1110 kg (2447 lb) |
| Operating Weight (Enclosed/Container) | 1902 kg (4193 lb) (per G90QX configuration) |
Dimensions
| Transport Length | 2150 mm (84.6 in) (open frame); 2750 mm (108.3 in) (enclosed) |
| Transport Width | 780 mm (30.7 in) (open frame); 1100 mm (43.3 in) (enclosed) |
| Transport Height | 1492 mm (58.7 in) (open frame); 1760 mm (69.3 in) (enclosed) |
Performance
| Max Power Output | 88 kVA / 70 kW |
| Rated Power Output | 80 kVA / 64 kW |
| Fuel Consumption (100% Load) | 18.7 L/h |
| Fuel Consumption (75% Load) | 14 L/h (per published references); 14.3 L/h (per published references) |
| Fuel Consumption (50% Load) | 9.3 L/h |
| Voltage | 230/400 V |
| Frequency | 50 Hz |
| Phases | 3 |
Service capacities (summary)
| Fuel Tank Capacity | 150 L (standard); the OEM part reference/2000 L (optional) |
| Engine Oil Capacity | 14 L |
| Cooling System Capacity | 15 L |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
Jcb G90X(JCB GENERATOR) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 5,000 h |
|
Servicing the G90X(JCB GENERATOR) beyond the schedule
Predictive Maintenance & Fluid Analysis
Monitor engine oil and hydraulic fluid samples every 500 hours to detect early wear. Check coolant concentration annually to prevent corrosion in the G-TC2 engine block. Inspect the fuel separator for water accumulation during routine checks. Use JCB-specified long-life coolant to maintain thermal efficiency. Track fuel consumption rates against the baseline of 14 L/h at 75% load to identify injector issues. Verify battery voltage and alternator output regularly to ensure stable power delivery.
Corrective & Common Repairs
Replace the air filter element every 500 hours or when restriction indicators show clogging. Inspect and adjust valve clearances every 250 hours to maintain compression. Check drive belt tension and wear at each service interval. Replace fuel filter elements every 250 hours to protect common-rail injectors. Inspect turbocharger shaft play and charge cooler boots for leaks. Clean the radiator and intercooler fins to prevent overheating in dusty environments.
Overhaul & Rebuild Points
Perform a full coolant flush and pressure test every 1000 hours to remove sediment. Inspect the crankcase breather pipe for blockages every 1000 hours. Check alternator insulation resistance every 1000 hours. Inspect the turbocharger and charge air system every 5000 hours. Tighten generator terminal connections and inspect for corrosion. Replace the fuel filter separator element as needed to prevent water ingress. Monitor engine oil pressure and temperature gauges for anomalies.
Seasonal & Environment Servicing
In cold climates, use appropriate grade oil and check battery heater functionality. Inspect the fuel system for waxing or gelling in low temperatures. Ensure coolant concentration is adequate for local minimum temperature. In hot environments, clean the radiator and intercooler more frequently to prevent overheating. Check canopy ventilation and exhaust system for proper airflow. Inspect the fuel tank vent for blockages. Verify operation of the low coolant and low oil pressure alarms.
G90X(JCB GENERATOR) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 320/04114 | Retainer, Fuel Filter | Fuel system service | Check fitment → |
| 320/07155 | Filter, Fuel - 5 Micron, Self Colour Can | Fuel system service | Check fitment → |
| 32/925705 | Element, Fuel Sediment/Water, 150 Microns | Fuel system service | Check fitment → |
| 32/925694 | Element, Fuel Filter | Fuel system service | Check fitment → |
| 32/925717 | Filter, Fuel Sediment, 30 Micron | Fuel system service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
G90X(JCB GENERATOR) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| P0087 | Fuel rail/system pressure too low | Fuel filter blockage or lift pump failure | Check fuel filters and fuel pump operation |
| P0117 | Engine coolant temperature sensor circuit low voltage | Faulty coolant temperature sensor or wiring issue | Inspect sensor wiring and replace sensor if necessary |
| P0521 | Engine oil pressure sensor range/performance issue | Faulty oil pressure sensor or low oil level | Check oil level and test sensor signal |
| P2047 | DEF/AdBlue injector circuit open (SCR system fault) | Open circuit in reductant injector wiring | Inspect injector wiring harness and connections |
| U0100 | Lost communication with Engine Control Module (ECM) | CAN bus communication failure or loose connector | Check battery voltage and CAN bus connections |
| 101 | Low transmission clutch pressure detected | Hydraulic pressure loss or sensor fault | Check hydraulic fluid levels and pressure sensors |
| P0335 | Crankshaft Position Sensor "A" Circuit No Signal | Faulty crank sensor or damaged wiring | Inspect crank sensor and wiring harness |
| P0102 | MAF (Mass Air Flow) Low Voltage Fault | Dirty or faulty MAF sensor | Clean or replace MAF sensor |
| P0321-87 | CAN bus message error for engine speed from engine ECU | CAN bus communication error | Check CAN bus wiring and connectors |
| P029B | Injector drift fault detection on Injector 2 | Faulty injector 2 or control circuit issue | Test injector 2 and control circuit |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
G90X(JCB GENERATOR) attachments & work tools
Enclosure & Mounting Configurations
The G90X is offered in Open, Canopy, and Container types, as documented in the JCB Power Products range specifications for the 65 to 140 kVA class. The G90QX variant is similarly available in these three enclosure configurations. These configurations are designed for prime power and standby applications, with canopy options engineered for noise-sensitive environments.
Engine & Powertrain
The G90X utilizes a JCB engine, with specific parts catalog references (the OEM part reference) indicating the use of a turbocharged (TC) engine overhaul kit. The compact generator range, which includes the G90X, is powered by JCB 4 Cylinder DIESELMAX or JCB 6 Cylinder DIESELMAX engines. The G90QX is also listed with a JCB engine make in the technical specifications.
Electrical & Control Systems
The G90QX technical specifications reference the JCB ATP1 controller connected via CANBUS to the JCB CP1 for control functions and display. Control options include synchronizing and auto main failure (AMF) panels. The generator range supports 50Hz and 60Hz frequencies, with prime power ratings around 80 kVA and standby power around 88 kVA for the G90QS/G90X class.
Fuel & Fluid Systems
The G90X class features total fuel capacities of 270 liters for the compact range models (G90QS/G90X). Extended fuel tanks or connections for external bulk fuel tanks are available as configurable options. JCB service fluids, including specific hydraulic oil and engine oil, are recommended for maintenance, with silicate-based coolant protection noted for engine longevity.
Telematics & Monitoring
LiveLink Telematics is available on the generator range to monitor fuel consumption, engine health, voltage, current across three phases, and exported power tracking. This system allows for remote management of the genset's operational data and maintenance scheduling.
All G90X(JCB GENERATOR) assemblies by section
Every catalogued assembly group for the Jcb G90X(JCB GENERATOR). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Z Electrical Power Generation, Unit
Z1-1-1 Engine 320/40255, Complete, Tca Turbo 100kw
| 32***55 | Engine, Complete 100kw 12v, Euro 2 11.5"F/W | 1 |
Z1-2-1 Engine 320/40106, Complete, Nat/Aspirated 74kw
| 32***06 | Engine, Assembly 74kw 12v, Tc, Euro 2 11.5" F/W | 1 |
Z2-1-1 Service Tools
| 32***20 | Bracket, Engine Lifting | 1 |
| 89***46 | Tool, Fitting, Core Plug | 1 |
| 89***47 | Tool, Crankshaft Turning | 1 |
Z2-2-1 Sealant Templates
| 89***49 | Template, Oil Pan Sealant | 1 |
| 89***75 | Template, Sealant, Bedplate To Block | 1 |
| 89***77 | Template, Sealant, Flywheel, Housing To Gearcase | 1 |
Z3-1-1 Lubricants Primers, & Sealants
| 32***28 | Sealant, 620 | 0 |
| 32***29 | Lubricant, O Ring, P80 | 0 |
| 32***30 | Sealant, 5900 | 0 |
Z4-1-1 Seal Kit, Rocker Cover
| 32***92 | O Ring, Oil Filler Cap | 1 |
| 32***87 | Cap, Fuel Injector | 4 |
| 32***88 | Cap, Fuel Pipe | 8 |
Z4-2-1 Gasket Set, Top Overhaul
| 32***08 | Gasket, Cylinder Head | 1 |
| 32***33 | Seal, Valve Stem | 16 |
| 32***40 | O Ring | 1 |
Z4-3-1 Gasket Set, Bottom Overhaul
| 32***31 | Sealant, 518 | 1 |
| 32***29 | Seal, Rear Oil | 1 |
| 32***19 | Seal, Front Oil | 1 |
Z4-4-1 Seal Kit, Oil Pan
| 32***30 | Sealant, 5900 | 1 |
| 32***50 | O Ring | 2 |
| 32***62 | Seal, Oil-Pick-Up | 1 |
Z4-5-1 Gasket Set, Top Overhaul, Tc
| 32***08 | Gasket, Cylinder Head | 1 |
| 32***33 | Seal, Valve Stem | 16 |
| 32***40 | O Ring | 2 |
Z5-2-1 Engine, Short, Tc 320/40060
| 32***29 | Seal, Rear Oil | 1 |
| 32***19 | Seal, Front Oil | 1 |
| 32***17 | Kit-Top Gasket, Turbo Engine | 1 |
Z5-6-1 Kit-Engine Overhaul, Standard, Tc
| 32***40 | Bolt, Con-Rod, M8 X 57 | 8 |
| 32***11 | Kit-Piston, Standard, Turbo | 4 |
| 32***80 | Kit-Top Gasket, Turbo Engine | 1 |
Z5-6-3 Kit-Engine Overhaul, Oversize - 1.00mm, Tc
| 32***40 | Bolt, Con-Rod, M8 X 57 | 8 |
| 32***39 | Kit-Piston, Oversize - 1.0mm, Turbocharged | 4 |
| 32***80 | Kit-Top Gasket, Turbo Engine | 1 |
Z5-6-2 Kit-Engine Overhaul, Oversize - 0.50mm, Tc
| 32***40 | Bolt, Con-Rod, M8 X 57 | 8 |
| 32***38 | Kit-Piston, Oversize - 0.50mm, Turbocharged | 4 |
| 32***80 | Kit-Top Gasket, Turbo Engine | 1 |
Z5-4-1 Engine, Long, Tc 320/40081
| 32***32 | Gear, Crankshaft, Assembly | 1 |
| 32***43 | Kit-Gasket, Long Engine, Tc/Tca | 1 |
| 32***03 | Piston, & Con-Rod, Assembly | 1 |
Z6-1-1 Fuel Filter
| 13***5Z | Bolt, Flange Head, M8 X 20 Lg | 1 |
| 21***07 | Pin, Tension | 1 |
| 32***14 | Retainer, Fuel Filter | 1 |
Z6-4-1 Primary Fuel Filter, Element, Cold Climate
| 32***05 | Element, Fuel Sediment/Water, 150 Microns | 1 |
| 32***33 | Seal, O'Ring | 1 |
Z6-2-1 Oil Filter
| 32***33 | Filter, Engine Oil | 1 |
| 32***23 | G.A, Oil Cooler 60kw, Inc Filter/Filler | 1 |
| 32***24 | Cooler, Oil, Inc Filter/Filler | 1 |
Z6-3-1 Primary Fuel Filter
| 13***7Z | Screw, M8 X 25 | 2 |
| 13***7Z | Screw, M12 X 25 | 2 |
| 32***94 | Element, Fuel Filter | 1 |
Z8-2-1 Autotensioner, Drive Belt
| 13***8Z | Screw, Star Drive, M8 X 30 | 3 |
| 32***84 | Adjuster, Auto-Tension | 1 |
| 32***46 | Adjuster, Autotensioner | 1 |
Z8-3-1 Lower Idler Pulley, 79mm Diameter
| 13***9Z | Bolt, M8 X 35, Flange Reduced Hex | 2 |
| 13***1Z | Bolt, M8 X 45, Flange Reduced Hex | 1 |
| 32***86 | Pulley, Lower Idler, Assembly | 1 |
Z8-1-1 Crankshaft Pulley
| 32***69 | Bolt, Torx Head Flange, M12 X 65 X 12.9 | 3 |
| 32***43 | Pulley, Crankshaft | 1 |
| 32***01 | Crankshaft, Assembly | 1 |
Z8-12-4 Front End Drive, Accessories, With Cooling Fan
| 32***03 | Pulley, Cooling Fan 1.25:1, D=133mm | 1 |
| 32***41 | Screw, Pan Head, M8 X 20 | 4 |
| 32***50 | Hub, Fan Drive, Assembly 1.375 Ratio | 1 |
Z8-12-3 Front End Drive, Accessory, With Cooling Fan
| 32***00 | Hub, Fan Drive, Assembly | 1 |
| 32***03 | Pulley, Cooling Fan 1.25:1, D=133mm | 1 |
| 32***30 | Pulley, Idler, Long | 1 |
Z8-3-2 Lower Idler Pulley
| 13***5Z | Bolt, Flange Head, M8 X 65 | 3 |
| 22***62 | Circlip, Internal | 1 |
| 32***22 | Pulley, Idler, D=124mm | 1 |
Z8-8-1 Front End Drive, Accessory, 79mm Diameter Idler Pulley
| 32***00 | Hub, Fan Drive, Assembly | 1 |
| 32***41 | Screw, Pan Head, M8 X 20 | 1 |
| 32***72 | Pulley, Fan, D=166, Ratio 1:1 | 1 |
Z9-1-1 Starter Motor, 12.Volt
| 13***8Z | Screw, Star Drive, M10 X 30 | 3 |
| 32***32 | Motor, Starter 12v, With Earth Stud | 1 |
| 32***52 | Motor, Starter | 1 |
Z10-1-1 Alternator, 12volt - 95amp
| 13***8Z | Screw, Star Drive, M10 X 30 | 1 |
| 13***2Z | Bolt, Star Drive, M10 X 120 | 1 |
| 32***60 | Alternator, 12v-95amp | 1 |
Z11-1-1 Switches & Senders, 12volt
| 17***02 | Seal, Ring | 1 |
| 32***46 | Switch, Oil Pressure | 1 |
| 32***57 | Seal, Bonded | 1 |
Z12-2-10 Fuel Pipes, Low Pressure, Tca
| 32***39 | Bolt, Banjo M12 | 2 |
| 32***33 | Ring, Snap | 1 |
| 32***34 | O Ring | 4 |
Z12-3-1 Fuel Pipework, Primary Filter
| 32***41 | Pipe, Fuel Filter To Pump | 1 |
| 32***42 | Clip, Pipe, 8/9mm Dia | 1 |
| 32***43 | Clip, Pipe, 9.5/10mm Dia | 1 |
Z12-1-1 Fuel Pipework, High Pressure
| 32***11 | Clip, F.I.P 2 Way | 4 |
| 32***59 | Pipe, Fuel, Injector 1 & 2, Assembly | 1 |
| 32***60 | Pipe, Fuel Injector 3 & 4, Assembly | 1 |
Z12-2-1 Fuel Pipework, Low Pressure
| 32***39 | Bolt, Banjo M12 | 2 |
| 32***33 | Ring, Snap | 1 |
| 32***34 | O Ring | 4 |
Z13-1-1 Fuel Injector, Tca
| 32***93 | Bolt, Injector Clamp | 4 |
| 32***39 | Clamp, Fuel Injector | 4 |
| 32***24 | Seal, Injector | 1 |
Z13-2-1 Fuel Injector, Tc
| 32***93 | Bolt, Injector Clamp | 4 |
| 32***39 | Clamp, Fuel Injector | 4 |
| 32***24 | Seal, Injector | 1 |
Z14-1-1 Fuel Lift Pump
| 13***7Z | Screw, Star Drive, M8 X 25 | 3 |
| 32***40 | Pump, Fuel Lift | 1 |
| 32***51 | O Ring | 1 |
Z15-50-1 Injection Pump, Service Parts
| 32***74 | Kit-Regulator | 1 |
| 32***75 | Kit-Timing Window | 1 |
| 32***76 | Kit-Plug | 1 |
Z15-1-1 Fuel Injection Pump, 12v - 110kw
| 32***19 | Seal, Injection Pump To Timing Case | 1 |
| 32***64 | Nut, M8 Flange Head | 3 |
| 32***77 | Nut, M14, Fuel Injection Pump Gear | 1 |
Z15-2-1 Fuel Injection Pump, 12v - 74kw
| 32***19 | Seal, Injection Pump To Timing Case | 1 |
| 32***64 | Nut, M8 Flange Head | 3 |
| 32***77 | Nut, M14, Fuel Injection Pump Gear | 1 |
Z16-1-1 Water Pump
| 32***10 | Gasket, Water Pump | 1 |
| 32***14 | Screw, Pan Head, M8 X 25 | 4 |
| 32***42 | Pump, Water, Assembly | 1 |
Z17-1-1 Water Inlet, Connector
| 13***7Z | Screw, Star Drive, M8 X 25 | 4 |
| 32***01 | Gasket, Water Inlet Pipe | 1 |
| 32***47 | Connector, Water Inlet, Assembly | 1 |
Z18-1-1 Thermostat & Housing
| 13***5Z | Screw, Star Drive, M8 X 20 | 3 |
| 32***40 | Housing, Thermostat | 1 |
| 32***43 | Seal, C | 1 |
Z19-11-1 Cover, Injector Seal
| 32***16 | Cover, Injector Seal | 1 |
| 32***17 | Insert, Injector Seal Cover | 4 |
| 32***21 | G.A, Cover.Injector Seal | 1 |
Z19-1-1 Rocker Cover
| 32***90 | Cap, Oil Filler, Assembly | 1 |
| 32***92 | O Ring, Oil Filler Cap | 1 |
| 32***73 | Spring, Ccv Valve | 1 |
Z20-3-1 Rocker Shaft, Assembly
| 13***2Z | Bolt, M8 X 50 | 7 |
| 13***5Z | Bolt, Flange Head, M8 X 65 | 1 |
| 32***23 | Washer, Spring | 4 |
Z21-2-1 Valve Tappets & Push, -Rods
| 32***24 | Tappet, Valve | 8 |
| 32***77 | Rod, Push | 8 |
| 32***05 | Camshaft, Assembly | 1 |
Z22-2-1 Turbocharger, Tca
| 32***07 | Stud, M8 X 75 | 4 |
| 32***08 | Nut, Lock, M8 Special | 4 |
| 32***53 | Gasket, Single, Tc To Manifold | 1 |
Z22-1-1 Turbocharger, Tc
| 32***07 | Stud, M8 X 75 | 4 |
| 32***08 | Nut, Lock, M8 Special | 4 |
| 32***53 | Gasket, Single, Tc To Manifold | 1 |
Z23-1-10 Turbo Pipework
| 13***3Z | Bolt, M6 X 16, Flange Reduced Hex | 2 |
| 13***5Z | Screw, Star Drive, M8 X 20 | 2 |
| 32***51 | O Ring | 2 |
Z23-1-1 Turbo Pipework
| 13***3Z | Screw, M6x16 | 2 |
| 13***5Z | Screw, Star Drive, M8 X 20 | 2 |
| 32***51 | O Ring | 2 |
Z23-2-1 Turbo Crossover Tube
| 32***14 | G.A, Turbo Crossover Tube, Garrett Htt | 1 |
| 32***33 | Tube, Turbo Crossover | 1 |
| 32***36 | Hose, 49.5mm X 55mm | 2 |
Z25-4-1 Induction Manifold, Tca
| 13***7Z | Screw, Star Drive, M8 X 25 | 10 |
| 32***11 | Plate, Blanking, Intake Heater | 1 |
| 32***12 | Gasket, Intake Heater | 1 |
Z26-2-1 Exhaust Manifold, Tc
| 32***00 | Manifold, Exhaust | 1 |
| 32***35 | Gasket, Heatshield | 1 |
| 32***45 | Bolt, M10 X 57 | 8 |
Z27-3-1 Cylinder Head, Assembly
| 14***15 | Washer, Seal; Replaces Khj0891 | 1 |
| 32***03 | Plug, Core, D=40mm | 2 |
| 32***28 | Sealant, 620 | 0 |
Z28-1-1 Brackets, Engine Lifting
| 13***8Z | Screw, Star Drive, M10 X 30 | 4 |
| 32***20 | Bracket, Engine Lifting | 2 |
| 32***39 | Label, Front Lifting Eye | 1 |
Z29-4-1 Oil Cooler
| 13***5Z | Bolt, Flange Head, M8 X 20 Lg | 5 |
| 13***7Z | Bolt, M8 X 25, Flange Reduced Hex | 11 |
| 21***07 | Pin, Tension | 1 |
Z30-1-1 Oil Level Dipstick, & Tube, Short
| 13***5Z | Bolt, Flange Head, M8 X 20 Lg | 1 |
| 32***27 | O Ring | 2 |
| 32***29 | O Ring | 1 |
Z31-1-1 Oil Sump
| 13***3Z | Screw, Star Drive, M8 X 16 | 2 |
| 32***13 | Plug, Oil Drain | 2 |
| 32***50 | O Ring | 2 |
Z31-2-1 Pump, Oil, Sump Extraction
| 33***58 | Pump, Sump Oil Extraction | 1 |
| 33***59 | Bracket, Oil Pump Support | 1 |
| 33***60 | Hose, Oil Extraction Pump | 1 |
Z32-1-1 Oil Pump
| 13***2Z | Screw, Star Drive, M8 X 50 | 4 |
| 32***31 | Pump, Engine Oil | 1 |
| 32***20 | Pump, Oil | 1 |
Z33-1-1 Flywheel Assembly, 11.5"Sae J620
| 32***42 | Bolt, M14 X 108mm | 8 |
| 32***72 | Flywheel, Assembly | 1 |
| 32***75 | Hub, Flywheel | 1 |
Z34-1-1 Flywheel Housing, Fh1
| 13***3Z | Screw, Star Drive, M8 X 16 | 2 |
| 13***7Z | Screw, Star Drive, M8 X 25 | 4 |
| 13***2Z | Screw, Star Drive, M8 X 50 | 8 |
Z35-2-1 Camshaft, & Idler Gear, Tc
| 32***30 | Camshaft, Assembly, Tc/Tca | 1 |
| 32***36 | Plug, Idler Gear Blanking, M8 X 18 | 3 |
| 32***06 | Camshaft, Assembly | 1 |
Z36-1-1 Timing Case & Covers, Idler Blanking
| 13***7Z | Screw, Star Drive, M10 X 25 | 2 |
| 13***9Z | Screw, Star Drive, M12 X 35 | 2 |
| 32***25 | Sealant, Loctite 5182 | 0 |
Z37-2-1 Piston & Con-Rod, Assemblies, Tca
| 32***17 | Bush, Small End | 1 |
| 32***40 | Bolt, Con-Rod, M8 X 57 | 2 |
| 32***50 | Circlip | 2 |
Z37-2-1 Piston & Con-Rod, Assemblies, Tc
| 32***17 | Bush, Small End | 1 |
| 32***40 | Bolt, Con-Rod, M8 X 57 | 2 |
| 32***50 | Circlip | 2 |
Z38-5-1 Crankshaft Assembly, 11.5" Flywheel
| 13***1Z | Screw, Star Drive, M10 X 45 | 1 |
| 21***05 | Dowel, Pin | 2 |
| 32***75 | Hub, Flywheel | 1 |
Z39-2-1 Cylinder Block, Assembly, Tc
| 13***8Z | Bolt, Star Drive, M8 X 80 | 16 |
| 32***01 | Plug, Core, D=25mm | 1 |
| 32***02 | Plug, Core, D=36mm | 2 |
Z39-3-1 Cylinder Block, Assembly, Tca
| 13***5Z | Screw, Star Drive, M8 X 20 | 2 |
| 13***8Z | Bolt, Star Drive, M8 X 80 | 16 |
| 32***01 | Plug, Core, D=25mm | 1 |
Z42-1-1 Mountings, Engine & Power Unit
| 13***7Z | Bolt, M12 X 25mm, Reduce Flange Hex | 8 |
| 13***8Z | Bolt, Flange Head, M12 X 30 | 8 |
| 13***0Z | Bolt, Flange Head, M16 X 35 | 2 |
Z43-1-1 Air Filter, Installation
| 13***9Z | Setscrew, M8x35 | 2 |
| 13***7Z | Screw, M10 X 25 | 3 |
| 16***77 | Cap, Rain | 1 |
Z43-2-1 Air Filter, Installation
| 13***8Z | Bolt, M8 X 30, Flange Reduced Hex | 2 |
| 13***7Z | Bolt, M10 X 25, Flange Reduced Hex | 3 |
| 13***3Z | Nut, Self Lock, M8 | 2 |
Z44-2-1 Air Induction Hoses, Turbo
| 16***74 | Adapter, Vacuum Sensor | 1 |
| 22***13 | Clip, Jubilee; Replaces Khj0336 | 1 |
| 22***15 | Clip, Jubilee | 1 |
Z44-1-1 Air Induction Hoses, Turbo
| 16***74 | Adapter, Vacuum Sensor | 1 |
| 22***13 | Clip, Jubilee; Replaces Khj0336 | 1 |
| 22***16 | Clip, Jubilee | 1 |
Z46-1-1 Radiator & Fittings, Mountings
| 13***3Z | Bolt, M6 X 16, Flange Reduced Hex | 17 |
| 13***2Z | Bolt, M8 X 50 | 1 |
| 13***8Z | Bolt, M10 X 30, Flange Reduced Hex | 4 |
Z46-11-1 Fan Guards
| 13***3Z | Bolt, M6 X 16, Flange Reduced Hex | 6 |
| 32***17 | G.A., Cooling Pack - Na, Canopy | 0 |
| 32***49 | G.A, Cooling Pack - G-Drive | 0 |
Z46-2-1 Fittings & Mountings, Coolers
| 13***9Z | Bolt | 2 |
| 13***2Z | Bolt, M8 X 50 | 1 |
| 13***7Z | Bolt, M10 X 25, Flange Reduced Hex | 4 |
Z47-2-1 Fan Guards
| 13***7Z | Screw, M6 X 25mm Long | 25 |
| 32***28 | Guard, Fan, Right Hand | 1 |
| 32***29 | Guard, Fan, Idler Pulley | 1 |
Z47-1-10 Cooling Pack, Assembly
| 16***80 | Cap, 1 Bar Pressure | 1 |
| 22***12 | Clip, Jubilee | 12 |
| 32***32 | Guard, Fan, Assembly, Tca | 1 |
Z47-1-1 Radiator Assembly
| 32***17 | G.A., Cooling Pack - Na, Canopy | 1 |
| 33***38 | Radiator | 1 |
Z48-11-1 Radiator, Coolant Drain
| 22***05 | Clip, Jubilee | 2 |
| 32***32 | G.A, Coolant Drain | 1 |
| 33***18 | Adaptor, Bulkhead | 1 |
Z48-1-1 Radiator, Hose & Pipework
| 22***01 | Clip, Jubilee | 3 |
| 22***12 | Clip, Jubilee | 4 |
| 32***14 | Tank, Coolant Recovery | 1 |
Z49-1-10 Cooling Fan, &, Spacer Tca
| 13***5Z | Bolt, Flange Head, M8 X 65 | 4 |
| 14***7D | Washer, M8 Plain | 4 |
| 32***39 | Fan, Cooling, 24" Pusher | 1 |
Z49-1-1 Cooling Fan & Spacer
| 13***5Z | Bolt, Flange Head, M8 X 65 | 4 |
| 32***94 | Fan, 22" Pusher | 1 |
| 32***19 | G.A., Engine Fan, Canopy | 1 |
Z50-15-1 Primary Fuel Filter, Installation
| 13***7Z | Screw, M8 X 25 | 2 |
| 13***7Z | Screw, M12 X 25 | 2 |
| 32***17 | Filter, Fuel Sediment, 30 Micron | 1 |
Z50-11-1 3-Way Ball Valve
| 13***1Z | Screw | 4 |
| 13***3Z | Nut | 4 |
| 14***15 | Washer, Seal; Replaces Khj0891 | 4 |
Z51-1-1 Primary Fuel Filter
| 32***02 | Ring, Retaining | 1 |
| 32***03 | Seal, Dust | 1 |
| 32***94 | Element, Fuel Filter | 1 |
Z58-2-1 Ccv Filter Outlet, Tca
| 32***53 | Clip | 1 |
| 32***19 | G.A, Ccv Breather Tca | 0 |
| 32***43 | G.A, Ccv Breather Tca | 0 |
Z58-1-1 Ccv Filter Outlet
| 13***3Z | Bolt, M6 X 16, Flange Reduced Hex | 1 |
| 32***19 | G.A., Breather | 1 |
| 33***20 | Hose, Ccv | 1 |
Z60-1-1 Chassis, Canopy Builds, D2
| 33***14 | Frame, Canopy Support, Lower | 1 |
| 33***29 | Clamp | 3 |
| 33***30 | Pipe, End Silencer | 1 |
Z61-1-1 Canopy, Assembly, Rental
| 33***51 | Cover | 2 |
| 33***53 | Dowel, Location | 2 |
| 33***56 | Hinge | 2 |
Z61-2-1 Canopy, Assembly, Standard Range
| 33***51 | Cover | 2 |
| 33***53 | Dowel, Location | 2 |
| 33***56 | Hinge | 6 |
Z62-1-1 Generator Alternator, Uci224e
| 32***08 | Regulator, A.V.R Sx460 | 1 |
| 32***69 | Alternator | 1 |
| 32***99 | Kit-Rectifier, Service | 1 |
Z62-2-1 Generator Alternator, Uci224g
| 32***08 | Regulator, A.V.R Sx460 | 1 |
| 32***99 | Kit-Rectifier, Service | 1 |
| 32***79 | Alternator, Assembly, Uci 224 G16 | 1 |
Z62-3-1 Generator Alternator, Uci274d
| 32***08 | Regulator, A.V.R Sx460 | 1 |
| 32***99 | Kit-Rectifier, Service | 1 |
| 33***24 | Regulator, Voltage, Mx341 Avr | 1 |
Z63-10-1 Kit, Conversion, Can/Usb
| 33***91 | Kit, Can/Usb Converter; Kit Consists Of: Cc/Usb Converter; Usb Cable; Db9 Connector;, Telecontrol Software; Configuration Software | 1 |
Z65-11-4 Sensor, Oil Temperature
| 32***15 | G.A, Lube Oil Temp Sensor | 1 |
| 33***10 | Harness, Link, Engine Oil Pressure | 1 |
| 33***41 | Switch, Oil Temperature | 1 |
Z65-2-10 Battery Installation, With Isolator Switch, Tca
| 13***3Z | Bolt, M6 X 16, Flange Reduced Hex | 2 |
| 13***7Z | Bolt, M6 X 25, Flange Head | 2 |
| 13***3Z | Nut | 2 |
Z65-11-1 Engine Electrics
| 13***7Z | Bolt, M12 X 25mm, Reduce Flange Hex | 3 |
| 13***3Z | Nut | 2 |
| 13***3Z | Nut, Self Lock, M8 | 1 |
Z65-21-1 Engine Block Heater, 110/120v
| 32***50 | Heater, Cylinder Block, 1000w - 120v Mains | 1 |
| 32***53 | Washer, Copper Sealing | 1 |
| 32***82 | Kit-Heater, Engine Block, 120v | 1 |
Z65-11-2 Coolant Level Switch
| 32***92 | Switch, Coolant Level | 1 |
| 32***65 | G.A, Coolant Level Switch | 1 |
| 33***09 | Harness, Link, Low Coolant | 1 |
Z65-22-1 Engine Block Heater, 230/240v
| 32***53 | Washer, Copper Sealing | 1 |
| 32***59 | Element, Engine Block Heater, 230v | 1 |
| 32***60 | Kit-Block Heater, Engine, 230v | 1 |
Z65-11-10 Engine Electrics, Tca
| 13***7Z | Bolt, M12 X 25mm, Reduce Flange Hex | 3 |
| 13***3Z | Nut | 2 |
| 13***3Z | Nut, Self Lock, M8 | 1 |
Z65-11-5 Electronic Governor
| 13***3Z | Bolt, M6 X 16, Flange Reduced Hex | 1 |
| 32***22 | Sensor, Vr Crankshaft | 1 |
| 32***65 | Plate, Sensor Clamping | 1 |
Z65-11-3 Oil Pressure Sender
| 14***08 | Seal, Washer | 2 |
| 32***80 | G.A, Oil Pressure Sender | 1 |
| 33***79 | Adapter, Oil Pressure Sender | 1 |
Z66-1-1 Battery
| 33***50 | Battery, Gel Type | 1 |
Frequently asked questions
What engine does the JCB G90X use?
The JCB G90X uses a JCB G-TC2 or Dieselmax 444 inline-4 diesel engine with a 4.4-liter displacement.
What is the operating weight of the JCB G90X?
The operating weight of the JCB G90X is approximately 1110 kg in open configuration.
What replaced the JCB G90X?
The JCB G90X is part of a continuous compact generator range that includes the G90QX, G115X, and G140X. There is no single direct replacement model; the lineup has been expanded.
What G90X(JCB GENERATOR) owners discuss
What engine configuration is standard for the JCB G90X generator set?
The JCB G90X utilizes a JCB 4 Cylinder DIESELMAX engine. This is part of the compact generator lineup which also includes models powered by JCB Diesel by Kohler and 6 Cylinder DIESELMAX engines.
What are the common electrical or sensor issues reported for JCB generator sets?
Common diagnostic trouble codes relate to the rail pressure control system, injectors, and sensors for intake pressure, temperature, fuel, and oil temperature. Specific faults include turbocharger overboost, water in fuel sensor feedback signal ADC faults, and AMF (Automatic Mains Failure) high side driver faults causing torque reduction.
How does the JCB G90X handle telematics and monitoring?
The unit supports LiveLink telematics, providing reports on voltage and current across three phases, fuel level timelines, engine operation across load bands, and exported power tracking. The JCB ATP1 controller connects via CANBUS to the JCB CP1 to display generator information and control functions.
What are the typical power ratings and frequency options for the JCB G90X?
The G90X is available in Prime Power (PRP) ratings at 50Hz and 400V. The broader G90 series (including G90QX) delivers electrical output from approximately 54 kWe to 99 kWe, with configurations for both 50 Hz and 60 Hz operation.
What maintenance considerations apply to the JCB G90X engine coolant?
Engine coolant must be changed at recommended service intervals to prevent silicate separation, which manifests as brown sludge in the expansion bottle. The coolant system relies on silicate-based corrosion protection to coat bare components.
What fluid specifications are recommended for JCB machinery systems?
JCB recommends using genuine JCB service fluids—including hydraulic oil, engine oil, and transmission oil—which are rigorously tested and approved. Equivalent alternatives are permitted if they meet JCB verification standards. The hydraulic system requires low viscosity hydraulic fluid to maintain efficiency.
What should be checked when buying a used JCB G90X generator?
Verify the specific engine variant (JCB 4 Cylinder DIESELMAX vs. other options) and confirm the serial number range matches the technical specifications for that build. Check LiveLink data for load band history and fuel consumption trends. Inspect the expansion bottle for brown sludge indicating coolant neglect. Verify the integrity of the AMF high side driver and water-in-fuel sensor circuits, as these are common fault points.
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 G90X(JCB GENERATOR). Related factory variants of the same model family:
G90X(JCB GENERATOR)
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