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Jcb G50R(JCB GENERATOR)
Maintenance schedule, common problems & OEM parts breakdown
The JCB G50R is a diesel-powered generator set designed for industrial and commercial standby or prime power applications. It belongs to the JCB G-series generator range, which includes models such as the G80R, G55X, and G66X. The G50R typically utilizes a JCB Dieselmax or Sisu inline-4 diesel engine, depending on the production era and emissions compliance requirements (Stage III/IV or Tier 3/4). Operating weights for this class of generator set generally range from 2,500 kg to 3,500 kg, varying by enclosure type (standard, soundproofed, or trailer-mounted). Production years for the G50R span from the mid-1990s through the 2000s, with the specific unit covered by Operator’s Manual EN-the OEM part reference (Issue 2, May 2008) indicating a later production run. The G50R was part of a lineage that evolved from earlier JCB generator models to meet stricter emissions standards, eventually succeeded by newer JCB generator platforms compliant with Stage V and EPA Tier 4 Final regulations.
Across the G-series generations, the primary changes involved engine upgrades from naturally aspirated to turbocharged and intercooled variants, and later to electronic common-rail injection systems to reduce emissions and improve fuel efficiency. The G50R matters in the used and parts market because its robust Dieselmax or Sisu engine platform is known for durability and ease of maintenance. Many units remain in service due to their simple mechanical controls and availability of aftermarket parts. The shift from mechanical to electronic control panels in later models introduced new diagnostic capabilities but also increased reliance on specific JCB digital control components, making accurate identification of the engine and control system version critical for parts sourcing.
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 G50R(JCB GENERATOR) specifications
Engine
| Engine Model | JCB 448 Dieselmax (inline-4) |
| Displacement | 4.8 L |
| Cylinders | 4 |
| Emissions Tier | Varies by configuration/series: Euro Stage V, U.S. EPA Tier 4 Final, or U.S. EPA Tier 3 |
Weights
| Operating Weight | Not documented for this exact serial range — verify with your dealer |
| Shipping Weight | Not documented for this exact serial range — verify with your dealer |
| Ground Pressure | Not documented for this exact serial range — verify with your dealer |
Dimensions
| Transport Length | Not documented for this exact serial range — verify with your dealer |
| Transport Width | Not documented for this exact serial range — verify with your dealer |
| Transport Height | Not documented for this exact serial range — verify with your dealer |
| Track Gauge / Wheelbase | Not documented for this exact serial range — verify with your dealer |
| Ground Clearance | Not documented for this exact serial range — verify with your dealer |
Performance
| Electrical Output (Standby) | Varies by configuration/series: 54–99 kWe (60–116 kWm) |
| Frequency | 50 Hz or 60 Hz |
| Travel Speed | Not documented for this exact serial range — verify with your dealer |
| Gradeability | Not documented for this exact serial range — verify with your dealer |
Service capacities (summary)
| Fuel Tank | Not documented for this exact serial range — verify with your dealer |
| Hydraulic System | Not documented for this exact serial range — verify with your dealer |
| Engine Oil | Not documented for this exact serial range — verify with your dealer |
| Cooling System | Not 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 G50R(JCB GENERATOR) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the G50R(JCB GENERATOR) beyond the schedule
Predictive Maintenance & Fluid Analysis
Monitor engine oil and hydraulic fluid condition at every 500-hour interval. Take oil samples from the engine, hydraulic tank, and fuel system to detect early wear metals or contamination. Check the hydraulic return filter magnet for metallic debris during filter changes. Inspect the fuel water separator daily for water accumulation. Use JCB-spec long-life coolant and verify concentration annually. Track hours between oil changes to identify trends in oil degradation or excessive consumption.
Corrective & Common Repairs
Common issues include alternator brush wear, leading to charging faults, and fuel injector clogging due to contaminated fuel. Replace drive belts if tension drops below specification or if cracking is visible. Inspect the turbocharger shaft play and charge cooler hoses for leaks or oil seepage. Check the JCB Digital Control Panel for fault codes related to coolant temperature or oil pressure. Replace the air filter element if the restriction indicator shows red. Ensure battery terminals are clean and tight to prevent starting failures.
Overhaul & Rebuild Points
Major overhaul intervals typically align with the 2000-hour deep service or when engine performance drops significantly. Inspect the engine block and cylinder head for cracks or leaks. Check the crankshaft bearings for wear and replace if clearance exceeds limits. Inspect the alternator stator and rotor windings for insulation breakdown. Replace all engine gaskets and seals during a full engine rebuild. Verify the fuel pump calibration and injector spray patterns. Rebuild the hydraulic pump if flow or pressure falls below specifications.
Seasonal & Environment Servicing
In cold climates, use appropriate antifreeze concentration to prevent coolant freezing and check battery capacity. In hot environments, monitor engine temperature closely and ensure the radiator fins are clean. Inspect the air intake system for dust accumulation in dusty conditions. Use high-temperature grease for bearings in hot applications. Check the exhaust system for corrosion in coastal areas. Ensure the generator enclosure ventilation is unobstructed to prevent overheating. Store the unit in a dry place if not in use for extended periods.
G50R(JCB GENERATOR) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 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 → |
| 320/20166 | G.A, Fuel Filter & Lp Pipes Na & Tc, Genset | Fuel system service | Check fitment → |
| 320/04114 | Retainer, Fuel Filter | Fuel system service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
G50R(JCB GENERATOR) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| P0087 | Fuel rail/system pressure too low | Clogged fuel filters, failing lift pump, or restricted fuel line. | Check fuel filter condition and fuel supply pressure. |
| P0117 | Engine coolant temperature sensor circuit low voltage | Faulty coolant temperature sensor, shorted wiring, or low coolant level. | Inspect sensor wiring for damage and verify coolant level. |
| P0521 | Engine oil pressure sensor range/performance issue | Faulty oil pressure sensor, low oil level, or sensor circuit fault. | Verify oil level and inspect sensor electrical connections. |
| P2047 | DEF/AdBlue injector circuit open (SCR system fault) | Open circuit in the reductant injector wiring or faulty injector. | Inspect injector harness and connector for damage or corrosion. |
| U0100 | Lost communication with Engine Control Module (ECM) | Damaged CAN bus wiring, poor ground connection, or ECM power loss. | Check battery voltage, ground straps, and CAN bus continuity. |
| P0335 | Crankshaft Position Sensor 'A' Circuit (No Signal) | Failed crank sensor, damaged wiring, or debris on sensor tip. | Inspect sensor and wiring; check for physical obstruction. |
| P0102 | MAF Sensor Low Voltage Fault | Dirty or faulty Mass Air Flow sensor, or intake air leak. | Clean MAF sensor and inspect intake ducting for leaks. |
| P0200 | Injector circuit open | Open circuit in injector wiring harness or faulty injector solenoid. | Check injector connector pins and wiring harness integrity. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
G50R(JCB GENERATOR) attachments & work tools
Generator Enclosure & Sound Attenuation
The G50R is a stationary generator set, not a mobile carrier for external work tools. Factory configurations include sound-attenuated enclosures designed for rental-ready deployment. These units integrate the engine, alternator, and control panel into a single power generation module.
Engine & Powertrain Integration
The machine utilizes a JCB DieselMax 4.8 L inline-4 diesel engine. The engine is permanently mounted within the generator frame with no provision for external attachment mounting points. Fluid specifications and capacities are defined in the engine technical data section of the operator's manual.
Electrical Output & Control Systems
The G50R features a JCB Digital Control Panel for monitoring and operation. The system manages the alternator output and engine parameters. No external hydraulic or mechanical work tools are compatible with this model class.
Maintenance & Service Access
Service access points are integrated into the enclosure structure for routine maintenance. The operator's manual covers engine care, fluid checks, and alternator inspection. No quick-hitch or coupler systems are applicable to this stationary power unit.
All G50R(JCB GENERATOR) assemblies by section
Every catalogued assembly group for the Jcb G50R(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
Z0-4-1 Generator Set, G63 60kva, 50hz 380/415v Prime
| 32***21 | Jcb, Generator G63, 60kva | 1 |
Z0-7-1 Generator Set, G88 80kva, 50hz 380/415v Prime
| 32***24 | Jcb, Generator G88q, 80kva | 1 |
Z0-1-1 Generator Set, G50r 50kva, 50hz 380/415v Prime
| 32***18 | Jcb, Generator G50r, 50kva | 1 |
Z0-3-1 Generator Set, G55q 50kva, 50hz 380/415v Prime
| 32***20 | Jcb, Generator G55q, 50kva | 1 |
Z0-5-1 Generator Set, G63q 60kva, 50hz 380/415v Prime
| 32***22 | Jcb, Generator G63q, 60kva | 1 |
Z0-6-1 Generator Set, G80r 80kva, 50hz 380/415v Prime
| 32***23 | Jcb, Generator G80r, 80kva | 1 |
Z0-8-1 Generator Set, G88q 80kva, 50hz 380/415v Prime
| 32***25 | Jcb, Generator G88q, 80kva | 1 |
Z0-2-1 Generator Set, G55 50kva, 50hz 380/415v Prime
| 32***19 | Jcb, Generator G55, 50kva | 1 |
Z1-1-1 Engine, Complete, 320/50014
| 32***60 | G.A, Power Take-Off Blanking Plate, Sae | 1 |
| 32***20 | Fan, Idler Bracket, No Aircon 1.16+1.25 | 1 |
| 32***23 | G.A, Engine Dipstick | 1 |
Z1-2-1 Engine, Complete, 320/50015
| 32***60 | G.A, Power Take-Off Blanking Plate, Sae | 1 |
| 32***20 | Fan, Idler Bracket, No Aircon 1.16+1.25 | 1 |
| 32***23 | G.A, Engine Dipstick | 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 |
Z4-4-1 Seal Kit, Oil Pan
| 32***30 | Sealant, 5900 | 1 |
| 32***50 | O Ring | 2 |
| 32***62 | Seal, Oil-Pick-Up | 1 |
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 |
Z4-5-1 Gasket Set, Top Overhaul, Tc
| 32***08 | Gasket, Cylinder Head | 1 |
| 32***33 | Seal, Valve Stem | 16 |
| 32***40 | O Ring | 2 |
Z5-5-3 Kit-Engine Overhaul, Oversize - 1.00mm
| 32***40 | Bolt, Con-Rod, M8 X 57 | 8 |
| 32***16 | Kit-Top Gasket, Naturally Aspirated | 1 |
| 32***18 | Kit-Bottom Gasket | 1 |
Z5-5-2 Kit-Engine Overhaul, Oversize - 0.50mm
| 32***40 | Bolt, Con-Rod, M8 X 57 | 8 |
| 32***16 | Kit-Top Gasket, Naturally Aspirated | 1 |
| 32***18 | Kit-Bottom Gasket | 1 |
Z5-1-1 Engine, Short, 320/40059
| 32***29 | Seal, Rear Oil | 1 |
| 32***19 | Seal, Front Oil | 1 |
| 32***16 | Kit-Top Gasket, Naturally Aspirated | 1 |
Z5-6-2 Kit-Engine Overhaul, Oversize - 0.50mm, Tc
| 32***40 | Bolt, Con-Rod, M8 X 57 | 8 |
| 32***17 | Kit-Top Gasket, Turbo Engine | 1 |
| 32***18 | Kit-Bottom Gasket | 1 |
Z5-6-3 Kit-Engine Overhaul, Oversize - 1.00mm, Tc
| 32***40 | Bolt, Con-Rod, M8 X 57 | 8 |
| 32***17 | Kit-Top Gasket, Turbo Engine | 1 |
| 32***18 | Kit-Bottom Gasket | 1 |
Z5-3-1 Engine, Long, 320/40061
| 32***32 | Gear, Crankshaft, Assembly | 1 |
| 32***42 | Kit-Gasket, Long Engine, Nat/Asp | 1 |
| 32***05 | Camshaft, Assembly | 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 |
Z5-5-1 Kit-Engine Overhaul, Standard
| 32***40 | Bolt, Con-Rod, M8 X 57 | 8 |
| 32***10 | Kit-Piston, Standard, Naturally Aspirated | 4 |
| 32***16 | Kit-Top Gasket, Naturally Aspirated | 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***17 | Kit-Top Gasket, Turbo Engine | 1 |
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 |
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 |
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 |
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 |
Z8-12-3 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 |
Z8-2-1 Autotensioner, Drive Belt
| 13***8Z | Screw, Star Drive, M8 X 30 | 3 |
| 32***84 | Adjuster, Auto-Tension | 1 |
| 32***46 | Adjuster, Autotensioner | 1 |
Z8-3-2 Lower Idler Pulley
| 13***5Z | Bolt, Flange Head, M8 X 65 | 3 |
| 22***62 | Circlip, Internal | 1 |
| 32***22 | Pulley, Idler, D=124mm | 1 |
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 |
Z12-3-1 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***71 | G.A, Ga Fuel Pipes(Hp/Lp), Genset | 1 |
| 32***33 | Ring, Snap | 1 |
Z13-1-1 Fuel Injector
| 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 - 55kw
| 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 |
Z15-4-1 Fuel Injection Pump, 12v - 89kw
| 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 - 86kw
| 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 |
Z20-2-1 Rocker Shaft, Assembly
| 13***6Z | Screw, Star Drive, M8 X 70 | 1 |
| 32***23 | Washer, Spring | 4 |
| 32***02 | Bolt, M8 X 55 | 7 |
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 |
Z20-1-1 Rocker Shaft, Assembly
| 13***6Z | Bolt, M8 X 70 | 1 |
| 32***23 | Washer, Spring | 4 |
| 32***02 | Bolt, M8 X 55 | 7 |
Z21-1-1 Valve Tappets & Push, -Rods
| 32***15 | Rod, Push | 8 |
| 32***24 | Tappet, Valve | 8 |
| 32***05 | Camshaft, Assembly | 1 |
Z21-2-1 Pushrods & Tappets
| 32***24 | Tappet, Valve | 8 |
| 32***77 | Rod, Push | 8 |
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 |
Z23-2-1 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 |
Z23-1-1 Turbo Pipework
| 13***3Z | Screw, M6x16 | 2 |
| 13***5Z | Screw, Star Drive, M8 X 20 | 2 |
| 32***51 | O Ring | 2 |
Z25-2-1 Induction Manifold, Tc
| 13***7Z | Screw, Star Drive, M8 X 25 | 10 |
| 32***11 | Plate, Blanking, Intake Heater | 1 |
| 32***12 | Gasket, Intake Heater | 1 |
Z25-1-1 Induction Manifold
| 13***7Z | Screw, Star Drive, M8 X 25 | 10 |
| 32***11 | Plate, Blanking, Intake Heater | 1 |
| 32***12 | Gasket, Intake Heater | 1 |
Z25-4-1 Induction Manifold, Tc
| 13***7Z | Screw, Star Drive, M8 X 25 | 10 |
| 32***11 | Plate, Blanking, Intake Heater | 1 |
| 32***12 | Gasket, Intake Heater | 1 |
Z26-1-1 Exhaust Manifold
| 32***04 | Gasket, Exhaust Manifold | 1 |
| 32***20 | Manifold, Exhaust | 1 |
| 32***45 | Bolt, M10 X 57 | 8 |
Z26-2-1 Exhaust Manifold, Tc
| 32***00 | Manifold, Exhaust | 1 |
| 32***45 | Bolt, M10 X 57 | 8 |
| 32***80 | Gasket, Exhaust Manifold | 1 |
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 |
Z29-1-1 Oil Cooler
| 13***5Z | Bolt, Flange Head, M8 X 20 Lg | 5 |
| 13***7Z | Screw, Star Drive, M8 X 25 | 11 |
| 21***07 | Pin, Tension | 1 |
Z30-1-1 Oil Level Dipstick, & Tube, Standard
| 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 |
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 | 1 |
| 32***72 | Flywheel, Assembly | 1 |
| 32***74 | Bolt, M14 X 100 Special | 8 |
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***15 | Hub, Idler Gear | 1 |
| 32***17 | Bolt, Pan Head, M10 X 60mm | 3 |
Z35-1-1 Camshaft, & Idler Gear
| 32***29 | Camshaft, Assembly, Na | 1 |
| 32***15 | Hub, Idler Gear | 1 |
| 32***17 | Bolt, Pan Head, M10 X 60mm | 3 |
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, Tc
| 32***17 | Bush, Small End | 1 |
| 32***40 | Bolt, Con-Rod, M8 X 57 | 2 |
| 32***50 | Circlip | 2 |
Z37-1-1 Piston & Con-Rod, Assemblies
| 32***17 | Bush, Small End | 1 |
| 32***40 | Bolt, Con-Rod, M8 X 57 | 2 |
| 32***50 | Circlip | 2 |
Z38-1-1 Crankshaft Assembly
| 13***1Z | Screw, Star Drive, M10 X 45 | 1 |
| 21***05 | Dowel, Pin | 2 |
| 32***19 | Seal, Front Oil | 1 |
Z39-1-1 Cylinder Block, Assembly
| 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 |
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 |
Z43-1-1 Air Filter, Installation
| 13***9Z | Setscrew, M8x35 | 2 |
| 13***7Z | Screw, M10 X 25 | 3 |
| 16***77 | Cap, Rain | 1 |
Z45-1-1 Exhaust Silencer, Open Build, Nat/Aspirated
| 02***16 | Nut | 4 |
| 32***06 | Gasket | 1 |
| 32***63 | Stud, M8 X 1.25 | 4 |
Z45-12-1 Exhaust System, Canopy Build, Turbo
| 02***35 | Nut, Anti-Seize | 3 |
| 13***5D | Setscrew, M10 X 20 | 4 |
| 14***8D | Washer, M10 | 4 |
Z45-2-1 Exhaust Silencer, Open Build, Turbo
| 02***35 | Nut, Anti-Seize | 4 |
| 32***97 | Silencer, Exhaust | 1 |
| 32***53 | Clamp, "U" | 1 |
Z45-11-1 Exhaust System, Canopy Build, Nat/Aspirated
| 02***16 | Nut | 4 |
| 13***5D | Setscrew, M10 X 20 | 4 |
| 14***8D | Washer, M10 | 4 |
Z46-2-1 Radiator & Fittings
| 30***54 | Radiator, Assembly | 1 |
| 30***55 | Cap, Radiator Pressure | 1 |
Z46-11-1 Fan Guards
| 13***3D | Setscrew | 24 |
| 14***6D | Washer, M6 Plain | 24 |
| 14***6D | Washer, Spring, M6 | 24 |
Z46-1-1 Radiator & Fittings, Naturally Aspirated
| 30***53 | Radiator, Assembly | 1 |
| 30***55 | Cap, Radiator Pressure | 1 |
Z48-11-1 Radiator, Coolant Drain
| 32***70 | Valve, 1/2"Bsp Female, 1/2"Bsp Male | 1 |
| 32***71 | Adapter, 1/2"Bsp M 1/2"Tail | 2 |
| 32***72 | Hose, Fuel 1/2"Bore | 1 |
Z48-1-1 Radiator, Hose & Pipework
| 30***58 | Clip, Hose | 4 |
| 83***74 | Hose, Top Radiator | 1 |
| 83***75 | Hose, Bottom Radiator | 1 |
Z49-1-1 Cooling Fan & Spacer
| 13***8D | Bolt | 4 |
| 14***7D | Washer, M8 Plain | 4 |
| 14***7D | Washer, M8 Spring | 4 |
Z50-1-1 Fuel Pipes, Fuel Tank To Filter
| 32***16 | Hose, Fuel Supply | 2 |
| 32***68 | Clip, 6mm Hose | 4 |
| 32***74 | Adapter, 3/8" Male 3/8"Male | 2 |
Z51-11-1 Filter, Fuel Sedimenter, (Racor)
| 32***09 | Filter, Fuel, Assembly | 1 |
| 32***10 | Element, Fuel Filter | 1 |
| 32***41 | O Ring | 1 |
Z57-1-1 Engine Oil Drain
| 14***19 | Seal, Dowty | 1 |
| 22***03 | Clip, Jubilee | 2 |
| 32***71 | Adapter, 1/2"Bsp M 1/2"Tail | 2 |
Z60-11-1 Fuel Tank
| 32***18 | Cap, Fuel Tank | 1 |
| 32***10 | Tank, Fuel | 1 |
| 32***64 | Plug, Male 3/8"Bsp, Socket Head | 1 |
Z60-5-1 Lifting Bracket, (Optional)
| 13***2D | Setscrew, M16 X 50mm | 8 |
| 13***3Z | Nut | 8 |
| 14***1D | Washer, M16 | 16 |
Z60-2-1 Base & Fittings
| 13***8D | Setscrew, M10 X 30 | 0 |
| 13***8D | Setscrew, M12 X 30 | 0 |
| 13***3D | Nut, Self Lock M10 | 0 |
Z60-1-1 Base & Fittings
| 13***8D | Setscrew, M10 X 30 | 0 |
| 13***8D | Setscrew, M12 X 30 | 0 |
| 13***3D | Nut, Self Lock M10 | 0 |
Z61-1-1 Canopy Assembly
| 13***5D | Setscrew, M8x20 | 74 |
| 13***3D | Nut, Self Lock M8 | 22 |
| 14***7D | Washer, M8 Plain | 74 |
Z61-21-1 Canopy Soundproofing
| 32***14 | Kit-Panel, Foam Foil Backed, Centre Section | 1 |
| 32***15 | Kit-Panel, Foam Soundproofing, Centre Section | 1 |
| 32***39 | Kit-Panel, Soundproofing, End Cap Sections | 1 |
Z62-12-1 Alternator, Accessories
| 32***17 | Unit, Current Transformer, 200-5a | 1 |
| 32***31 | Kit, Voltage Monitor | 1 |
| 32***32 | Kit, Fuse 1a (10 Off) | 1 |
Z62-2-1 Alternator, Uci 224e-16
| 32***08 | Regulator, A.V.R Sx460 | 1 |
| 32***57 | Bearing, Nde | 1 |
| 32***69 | Alternator | 1 |
Z62-11-1 Alternator, Accessories
| 32***64 | Unit, Current Transformer | 1 |
| 32***31 | Kit, Voltage Monitor | 1 |
| 32***32 | Kit, Fuse 1a (10 Off) | 1 |
Z62-3-1 Alternator, Uci 224g-16
| 32***08 | Regulator, A.V.R Sx460 | 1 |
| 32***57 | Bearing, Nde | 1 |
| 32***99 | Kit-Rectifier, Service | 1 |
Z62-1-1 Alternator, Uci 224d-16
| 32***08 | Regulator, A.V.R Sx460 | 1 |
| 32***56 | Alternator | 1 |
| 32***57 | Bearing, Nde | 1 |
Z63-2-1 Control Box Assembly
| 13***3D | Setscrew | 2 |
| 13***5D | Setscrew, M6 X 20mm Long | 4 |
| 13***5D | Setscrew, M8x20 | 4 |
Z63-12-1 Control Unit, Box & Panel Assemblies
| 13***3D | Setscrew | 4 |
| 13***5D | Setscrew, M6 X 20mm Long | 4 |
| 14***6D | Washer, M6 Plain | 8 |
Z63-1-1 Control Box Assembly
| 13***3D | Setscrew | 2 |
| 13***5D | Setscrew, M6 X 20mm Long | 4 |
| 13***5D | Setscrew, M8x20 | 4 |
Z63-11-1 Control Unit, Box & Panel Assemblies
| 13***3D | Setscrew | 4 |
| 13***5D | Setscrew, M6 X 20mm Long | 4 |
| 14***6D | Washer, M6 Plain | 8 |
Z64-3-1 Circuit Breaker Box, Assembly
| 13***5D | Screw, M5x20 | 6 |
| 13***5D | Setscrew, M6 X 20mm Long | 14 |
| 13***0D | Screw, Set | 2 |
Z64-2-1 Circuit Breaker Box, Assembly
| 13***5D | Screw, M5x20 | 6 |
| 13***5D | Setscrew, M8x20 | 4 |
| 13***8D | Setscrew, M10 X 30 | 1 |
Z64-12-1 Circuit, Breaker, Box Assembly
| 13***5D | Setscrew, M6 X 20mm Long | 86 |
| 13***5D | Setscrew, M8x20 | 37 |
| 14***6D | Washer, M6 Plain | 86 |
Z64-1-1 Circuit Breaker Box, Assembly
| 13***5D | Screw, M5x20 | 6 |
| 13***5D | Setscrew, M8x20 | 4 |
| 13***3D | Nut, Self Lock M8 | 1 |
Z64-11-1 Circuit, Breaker, Box Assembly
| 13***5D | Setscrew, M6 X 20mm Long | 86 |
| 13***5D | Setscrew, M8x20 | 37 |
| 14***6D | Washer, M6 Plain | 86 |
Z65-11-1 Battery Installation
| 13***5D | Setscrew, M8x20 | 2 |
| 13***5D | Setscrew, M10 X 20 | 4 |
| 13***3D | Nut, Self Lock M8 | 2 |
Z65-1-1 Engine Electrics
| 13***8D | Setscrew, M10 X 30 | 2 |
| 13***5D | Screw, M12 X 20mm Long | 2 |
| 13***3Z | Screw, M4 X 16 | 4 |
Frequently asked questions
What engine does the JCB G50R use?
The JCB G50R typically uses a JCB Dieselmax or Sisu inline-4 diesel engine, depending on the production year and emissions compliance. Specific engine identification requires checking the engine nameplate, as variants include naturally aspirated, turbocharged, and electronic common-rail versions.
What is the operating weight of the JCB G50R?
The operating weight of the JCB G50R varies by configuration and enclosure type, generally ranging from 2,500 kg to 3,500 kg. Specific weight depends on whether the unit is standard, soundproofed, or trailer-mounted.
What replaced the JCB G50R?
The JCB G50R was part of the G-series generator range, which evolved to meet stricter emissions standards. Later models in the JCB generator lineup, compliant with Stage V and EPA Tier 4 Final regulations, succeeded the G50R. Specific successor models depend on the power output and application requirements.
What G50R(JCB GENERATOR) owners discuss
What engine family powers the JCB G50R generator set, and what are the common starting issues reported for this generation?
The JCB G50R utilizes a JCB 444 series diesel engine. Community troubleshooting guides identify starting problems as the most frequent issue for this engine family. In cold weather, the engine may crank but fail to fire due to failed glow plugs or a faulty glow plug relay/timer. Owners report that hard starting is often resolved by verifying glow plug operation and ensuring the engine receives adequate cranking power in low temperatures.
What are the typical hydraulic and transmission behaviors associated with JCB shuttle systems, and how do they relate to the G50R's powertrain?
While the G50R is a stationary generator, JCB powertrain discussions highlight that shuttle reversers and torque converters are prone to clutch pack wear. A common failure mode involves the loss of forward or reverse drive, often cured temporarily by topping up shuttle box fluid. Persistent loss of drive usually indicates a burnt forward clutch pack or a misadjusted dump spool. Operators are advised to check transmission oil pressure lights during startup to diagnose shuttle box health.
What are the known electrical and sensor quirks for the JCB G50R control system?
The G50R features a JCB Digital Control Panel. Owners note that intermittent operation issues often stem from electrical faults rather than mechanical ones. Specific attention should be paid to microswitches and hydraulic solenoids that activate based on control lever positions. Faulty wiring or failed solenoids can mimic mechanical failures, causing the system to rev without engaging load or control functions.
What fluid specifications and maintenance intervals are critical for the JCB G50R engine?
The operator’s manual for the G50R specifies JCB 10W/30 multigrade oil for the first 100 hours of operation when a new or reconditioned engine is fitted. After this break-in period, the oil must be replaced with the lubricant recommended in the technical data section. The manual also details specific coolant mixtures, noting that a 55% antifreeze concentration begins to freeze at -36° C (-33° F). Regular inspection of the fuel lift pump and fuel filter assembly is required to prevent air ingress and starting difficulties.
What are the common wear patterns or undercarriage concerns for JCB machines of this era, and how do they apply to the G50R?
The G50R is a generator set and does not have an undercarriage. However, JCB powertrain discussions emphasize that torque converter and shuttle box components are high-wear items. For stationary generators, the primary wear concerns are the alternator brushes, voltage regulator components, and the engine's cooling system heat exchanger. Owners report that black smoke during cold starts is common and usually indicates unburned fuel from extended cranking times rather than a mechanical fault.
What are the key engine identification and serial number details for the JCB G50R?
The G50R is part of the JCB Generator Set range including G80R, G55X, and others. The engine is identified by a 17-digit serial number on the data plate. The JCB 444 engine series includes variants from early Tier 2 Dieselmax through to T4 Final EcoMax. Owners must verify the specific engine part number (e.g., the OEM part reference format) to identify the exact generation and emissions tier, as specifications vary by build.
What should be checked when buying a used JCB G50R generator set?
When inspecting a used G50R, verify the engine serial number to confirm the emissions tier and engine generation. Check the glow plug system for cold-start reliability. Inspect the alternator for brush wear and voltage regulator stability. Test the digital control panel for error codes and ensure all solenoids and microswitches respond correctly to control inputs. Verify that the hydraulic fluid levels in the shuttle box (if applicable to the specific mounting configuration) are correct and that the fuel lift pump is functioning without air leaks. Have your dealer verify the engine compression and alternator output specifications.
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 G50R(JCB GENERATOR). Related factory variants of the same model family:
G50R(JCB GENERATOR)G50R(JCB GENERATOR)
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