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Jcb G380Q
Maintenance schedule, common problems & OEM parts breakdown
The JCB G380Q is a 350 kVA prime power, 380 kVA standby three-phase diesel generator set manufactured in the UK by AJ Power Ltd. It utilizes a JCB-engineered diesel engine running at 1500 rpm to deliver 280 kW of power at 400/230 V and 50 Hz. Production for this specific unit configuration is documented for the year 2008. The G380Q is part of the JCB G-Series generator lineup, which includes models such as the G330, G350, G400, G440, and G550. It is designed for industrial, commercial, and backup applications, featuring a silenced enclosure and a Mecc Alte alternator.
The G380Q represents a mid-range capacity unit within the G-Series, bridging the gap between the G350Q and the G400Q. Its significance in the used market lies in its robust JCB engine platform, which avoids DEF and DPF regeneration complexities found in newer emissions tiers, offering simpler maintenance for older fleets. The unit is built on a durable UK-manufactured frame, providing a cost-effective alternative to new systems for data centers, manufacturing plants, and hire fleets requiring reliable standby power.
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 G380Q specifications
Engine
| Model | JCB DieselMAX 672 TCAE Electronic Engine |
| Net Power (ISO 9249) | 284 hp (212 kW) |
| Displacement | 7.2 L |
| Cylinders | Not documented for this exact serial range — verify with your dealer |
| Emissions Tier | Not documented for this exact serial range — verify with your dealer |
Weights
| Operating Weight | 36,770 kg (81,063 lb) |
| 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 | 3,202 mm (10 ft 6 in) |
| Track Gauge / Wheelbase | Not documented for this exact serial range — verify with your dealer |
| Ground Clearance | 530 mm (1 ft 9 in) |
| Tail Swing Radius | 3,571 mm (11 ft 9 in) |
| Counterweight Clearance | 1,215 mm (4 ft 0 in) |
Performance
| Travel Speeds | Not documented for this exact serial range — verify with your dealer |
| Maximum Digging Depth | 6,726 mm (22 ft 1 in) |
| Bucket Capacity | 1.4 - 1.8 m³ (1.8 - 2.4 cu yd) |
| Lifting Capacity | 9,170 kg (20,216 lb) |
| Gradeability | Not documented for this exact serial range — verify with your dealer |
Service capacities (summary)
| Fuel Tank Capacity | 590 L (156 gal) |
| Hydraulic System (including tank) | 430 L (114 gal) |
| Hydraulic Tank | 239 L (63 gal) |
| Engine Oil | 25 L (6.6 gal) |
| 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 G380Q maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the G380Q beyond the schedule
Predictive Maintenance & Fluid Analysis
Collect baseline oil samples from the engine, hydraulic system, and axle housings at the 500-hour mark. Compare subsequent 1000-hour samples against this baseline to detect bearing wear or contamination early. Monitor the hydraulic return filter magnet for metallic debris during every 500-hour service. Use JCB-spec long-life coolant for the 1000-hour flush to prevent corrosion in the engine block and charge cooler. Track fuel filter restriction to protect the common-rail injectors on the JCB engine.
Corrective & Common Repairs
Address turbocharger shaft play and charge cooler boot integrity during the 1000-hour service to maintain Dieselmax engine efficiency. Replace the primary and secondary fuel filters if injector spray patterns show degradation during diagnostic scans. Inspect the Mecc Alte alternator brushes and slip rings for wear during electrical load tests. Check the automatic voltage regulator (AVR) and battery charger connections for corrosion, ensuring stable 400/230 V output. Tighten slew ring bolts on the generator frame if vibration indicates loosening.
Overhaul & Rebuild Points
Perform a full hydraulic oil change and tank cleaning at 2000 hours to prevent valve stiction in the generator control system. Inspect the engine block and frame for structural cracks or unauthorized welding. Measure swing ring play on the underlying chassis if the generator is mounted on a mobile base. Service the immersed brakes on wheeled configurations and check disc wear. Replace injector spray patterns if diagnostic tools indicate poor atomization, which affects fuel economy and emissions.
Seasonal & Environment Servicing
Install coolant jacket heaters for operation in freezing temperatures to ensure reliable starting of the JCB engine. Check the silenced enclosure seals and door latches to maintain noise reduction and prevent water ingress during heavy rain. Inspect the air filter housing for debris accumulation, which reduces engine performance in dusty quarry or construction sites. Verify the battery electrolyte levels in non-sealed units and clean terminals to prevent corrosion in humid environments. Test all safety shutdown functions and load bank the unit to verify performance under full load.
G380Q common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| SC1393641 | Head, Fuel Filter | Fuel system service | Check fitment → |
| SC1393640 | Element, Filter, Fuel Feed | Fuel system service | Check fitment → |
| SC1393639 | Filter, Fuel Feed | Fuel system service | Check fitment → |
| SC1471259 | Filter, Fuel | Fuel system service | Check fitment → |
| SC1763776 | Element, 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.
G380Q fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| P0087 | Fuel Rail Pressure Too Low | Fuel supply restriction, faulty lift pump, or pressure regulator failure. | Check fuel filters and lines for blockage; verify lift pump operation. |
| P0117 | Engine Coolant Temperature Sensor Circuit Low Voltage | Short to ground in sensor wiring or failed coolant temperature sensor. | Inspect sensor connector for corrosion; check wiring harness integrity. |
| P0521 | Engine Oil Pressure Sensor Range/Performance | Faulty oil pressure sensor or low oil level. | Verify oil level; test sensor resistance and signal output. |
| P2047 | Reductant Injector Circuit Open (SCR System) | Open circuit in DEF/AdBlue injector wiring or failed injector. | Inspect injector connector and wiring for damage; check fuse. |
| U0100 | Lost Communication with Engine Control Module | CAN bus network fault, poor ground, or ECM power loss. | Check battery voltage and ground straps; inspect CAN bus connectors. |
| P0335 | Crankshaft Position Sensor 'A' Circuit No Signal | Failed crank sensor, damaged tone ring, or open wiring. | Inspect sensor gap and wiring; verify signal with oscilloscope. |
| P0115 | Engine Coolant Temperature Sensor Circuit Malfunction | Sensor failure or intermittent connection. | Test sensor resistance at various temperatures; check connections. |
| P0190 | Fuel Pressure Sensor 'A' Circuit Malfunction | Faulty fuel rail pressure sensor or wiring issue. | Check sensor voltage and ground; inspect rail for leaks. |
| P0200 | Injector Circuit Malfunction | Open or shorted injector circuit. | Check injector connector and wiring harness for damage. |
| P0321 | CAN Bus Message Error for Engine Speed | Communication fault between ECM and display or other modules. | Inspect CAN bus wiring and connectors; check module power. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
G380Q attachments & work tools
Generators
The JCB G380Q is a 350 kVA prime / 380 kVA standby three-phase diesel generator manufactured in the UK by AJ Power Ltd. It utilizes a proven JCB engine housed in a durable UK-manufactured frame and is designed for industrial, commercial, and backup power applications.
All G380Q assemblies by section
Every catalogued assembly group for the Jcb G380Q. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Z Jcb Generator Set
Z0-12-1 Generator Set, G550q 500kva, 50hz 400v Prime
| 32***50 | Jcb, Generator G550q, 500kva | 1 |
Z0-7-1 Generator Set, G400 360kva, 50hz 400v Prime
| 32***45 | Jcb, Generator G400, 360kva | 1 |
Z0-9-1 Generator Set, G440 400kva, 50hz 400v Prime
| 32***47 | Jcb, Generator G440, 400kva | 1 |
Z0-11-1 Generator Set, G550 500kva, 50hz 400v Prime
| 32***49 | Jcb, Generator G550, 500kva | 1 |
Z0-10-1 Generator Set, G440q 400kva, 50hz 400v Prime
Z0-5-1 Generator Set, G380 350kva, 50hz 400v Prime
| 32***43 | Jcb, Generator G380, 350kva | 1 |
Z0-3-1 Generator Set, G350 310kva, 50hz 400v Prime
| 32***41 | Jcb, Generator G350, 310kva | 1 |
Z0-6-1 Generator Set, G380q 350kva, 50hz 400v Prime
| 32***44 | Jcb, Generator G380q, 350kvaq | 1 |
Z0-1-1 Generator Set, G330 300kva, 50hz 400v Prime
| 32***39 | Jcb, Generator G330, 300kva | 1 |
Z0-4-1 Generator Set, G350q 310kva, 50hz 400v Prime
| 32***42 | Jcb, Generator G350q, 310kva | 1 |
Z0-2-1 Generator Set, G330q 300kva, 50hz 400v Prime
| 32***40 | Jcb, Generator G330q, 300kva | 1 |
Z0-8-1 Generator Set, G400q 360kva, 50hz 400v Prime
| 32***46 | Jcb, Generator G400q, 360kva | 1 |
Z1-11-1 Engine, Complete, Dc16 Ems
| 32***97 | Engine, Assembly, Dc16 Ems | 1 |
Z1-2-1 Engine, Complete, Dc12 Ems
| 32***95 | Engine, Assembly, Dc12 Ems | 1 |
Z1-3-1 Engine, Complete, Dc12 Ems
| 32***96 | Engine, Assembly, Dc12 Ems | 1 |
Z1-1-1 Engine, Complete, Dc12 Ems
| 32***94 | Engine, Assembly, Dc12 Ems | 1 |
| SC***10 | Tool, Rear Crank Seal | 1 |
Z4-11-1 Gasket Set, Cylinder Head, Dc16
| SC***83 | Gasket, Manifold, Fuel | 1 |
| SC***61 | Gasket, Fuel Feed | 1 |
| SC***66 | Gasket, Rocker Cover, Upper | 1 |
Z4-12-1 Gasket Set, General Overhaul, Dc16
| SC***13 | Gasket | 2 |
| SC***83 | O Ring | 1 |
| SC***90 | Seal | 2 |
Z4-1-1 Gasket Set, Cylinder Head, Dc12
| SC***51 | Gasket, Rocker Cover, Upper | 1 |
| SC***42 | Seal, Fuel Feed | 4 |
| SC***61 | Gasket, Fuel Feed | 1 |
Z4-2-1 Gasket Set, General Overhaul
| SC***83 | O Ring | 1 |
| SC***11 | O Ring | 2 |
| SC***85 | O Ring | 1 |
Z5-1-1 Service Kit, Outer, Turbocharger
| SC***37 | Gasket | 1 |
| SC***71 | Gasket | 1 |
| SC***85 | Element, Oil Filter | 1 |
Z5-5-1 Kit, Piston, & Liner Dc12
| 33***21 | Liner, Cylinder | 1 |
| 33***22 | O Ring | 1 |
| 33***23 | O Ring | 1 |
Z5-11-1 Kit,Piston & Liner
| SC***29 | Pin, Gudgeon | 1 |
| SC***87 | Shim, =0.2mm, Liner | 0 |
| SC***43 | Ring, Retaining | 2 |
Z6-12-1 Filter, Water Seperator, Dc16
| SC***02 | Bowl, Fuel Feed | 1 |
| SC***41 | Head, Fuel Filter | 1 |
| SC***40 | Element, Filter, Fuel Feed | 1 |
Z6-11-1 Fuel Filter, Dc16
| SC***57 | Cover, Fuel Feed | 1 |
| SC***59 | Filter, Fuel | 1 |
| SC***58 | Pipe, Fuel Feed | 1 |
Z6-14-1 Filter, Oil, Centrifugal, Dc16
| SC***83 | O Ring | 1 |
| SC***35 | Nozzle | 1 |
| SC***85 | O Ring | 1 |
Z6-13-1 Filter, Oil, Dc16
| SC***08 | Filter, Oil, Assembly | 1 |
| SC***54 | O Ring | 1 |
| SC***28 | Tube | 1 |
Z6-1-2 Filter, Water Seperator, Dc12
| SC***02 | Bowl, Fuel Feed | 1 |
| SC***41 | Head, Fuel Filter | 1 |
| SC***40 | Element, Filter, Fuel Feed | 1 |
Z6-2-1 Filter, Oil, Dc12
| 33***08 | Element, Oil Filter | 1 |
| SC***98 | Adapter | 1 |
| SC***58 | Adapter | 1 |
Z6-3-1 Filter, Oil, Centrifugal, Dc12
| SC***32 | Cover | 2 |
| SC***83 | O Ring | 1 |
| SC***85 | O Ring | 1 |
Z6-1-1 Fuel Filter, Dc12
| SC***89 | Head, Filter | 1 |
| SC***04 | Plug | 1 |
| SC***76 | Element, Fuel Filter | 1 |
Z8-13-1 Front End Drive, Accessories, Water Pump/Alternator
| SC***87 | Roller, Fan Belt | 1 |
| SC***65 | Belt, Poly-V | 1 |
| SC***52 | Screw, M12 X 50 | 6 |
Z8-11-1 Front End Drive, Cooling Fan
| SC***77 | Bearing, Ball | 1 |
| SC***09 | Screw | 1 |
| SC***88 | Fan | 1 |
Z8-1-1 Front End Drive, Accessories, With Cooling Fan
| SC***88 | Screw, M12 X 35 | 6 |
| SC***95 | Bearing, Ball | 1 |
| SC***12 | Bolt, M14 X 74, Journal C/Shaft | 6 |
Z8-12-1 Front End Drive, Accessories, Cooling Fan, Dc16
| SC***88 | Screw, M12 X 35 | 6 |
| SC***11 | Screw | 6 |
| SC***71 | Hub, Fan Pulley, Driver | 1 |
Z9-2-1 Starter Motor, Dc16
| 33***01 | Motor, Starter | 1 |
| SC***23 | Stud | 3 |
| SC***26 | Plate, Starter Motor | 1 |
Z9-1-1 Starter Motor, Dc12
| SC***26 | Plate, Starter Motor | 1 |
| SC***48 | Relay | 1 |
| SC***11 | Motor, Starter | 1 |
Z10-11-2 Alternator, 100amp, Dc16
| 33***00 | Alternator | 1 |
| SC***92 | Sleeve, Guide | 2 |
| SC***64 | Alternator | 1 |
Z10-1-1 Alternator, Dc12
| SC***95 | Bolt, M16 X 90 | 1 |
| SC***66 | Capacitor | 1 |
| SC***53 | Regulator | 1 |
Z10-11-1 Alternator, Dc16
| SC***92 | Sleeve, Guide | 2 |
| SC***19 | Bracket, Alternator Mounting | 1 |
| SC***16 | Alternator | 1 |
Z11-1-1 Unit, Electronic Control, Dc12
| SC***91 | Cover, Engine Control Unit | 2 |
| SC***22 | Bolt | 8 |
| SC***99 | Housing, Contact 2, Engine Control Unit | 0 |
Z11-13-1 Cable Retainer, Cylinder Head
| 33***02 | Holder, Cable Clamp | 2 |
| 33***03 | Holder, Cable Bushing | 2 |
| SC***91 | Holder, Cable, Clamp | 8 |
Z11-2-1 Harnesses & Sensors, Dc12
| SC***21 | Sensor, Pressure, Oil | 1 |
| SC***72 | Cable, Harness | 1 |
| SC***20 | Sensor, Pressure, Charge | 1 |
Z11-4-1 Protection Plates, & Mounting Bracket, Dc12
| SC***74 | Plate, Protective | 1 |
| SC***63 | Bracket | 1 |
| SC***94 | Plate, Protective | 1 |
Z11-12-1 Harnesses & Sensors, Dc16
| SC***21 | Sensor, Pressure, Oil | 1 |
| SC***20 | Sensor, Pressure, Charge | 1 |
| SC***03 | Sensor, Speed 1 | 1 |
Z11-11-1 Unit, Electronic Control, Dc16
| 33***43 | Housing, Contact Engine Control Unit, 10-Pol | 0 |
| SC***91 | Cover, Engine Control Unit | 2 |
| SC***22 | Bolt | 8 |
Z11-3-1 Cable Retainers, Cylinder Head, Dc12
| SC***30 | Duct | 1 |
| SC***02 | Screw | 6 |
| SC***69 | Attaching Plate | 1 |
Z11-14-1 Protection Plate, & Mounting Bracket, Dc16
| SC***89 | Shield, Heat, Cable Routeing | 1 |
| SC***56 | Holder, Cable, Bushing | 4 |
| SC***30 | Shield, Heat, Rear Of Engine | 1 |
Z12-12-1 Fuel Return Pipes, Dc16
| 33***17 | Valve, Overflow | 1 |
| SC***77 | Nut | 1 |
| SC***65 | Bolt | 1 |
Z12-11-1 Fuel Pipework, High Pressure, Dc16
| SC***90 | Seal | 2 |
| SC***41 | Screw, Banjo | 2 |
| SC***77 | Nut | 1 |
Z12-1-1 Fuel Pipework, High Pressure, Dc12
| SC***90 | Seal | 1 |
| SC***77 | Nut | 1 |
| SC***67 | Banjo | 1 |
Z13-11-1 Fuel Injector, Dc16
| SC***64 | O Ring, Injector | 8 |
| SC***73 | Nozzle, Injector, Fuel | 1 |
| SC***39 | Washer, Injector | 8 |
Z13-1-1 Fuel Injector, Dc12
| SC***41 | Clamp, Injector | 6 |
| SC***88 | Nozzle, Fuel Injector | 1 |
| SC***64 | O Ring, Injector | 6 |
Z15-1-1 Fuel Feed Pump, Dc12
| SC***11 | O Ring | 1 |
| SC***19 | Screw, M8 X 30 | 2 |
| SC***09 | Screw | 2 |
Z15-11-1 Fuel Feed Pump, Dc16
| SC***19 | Screw, M8 X 30 | 2 |
| SC***70 | Pump, Hand, Fuel | 1 |
| SC***55 | Pump, Fuel Lift | 1 |
Z16-11-1 Water Pump, Dc16
| SC***64 | Gasket, Water Pump | 1 |
| SC***21 | Screw, M8 X 40 | 4 |
| SC***25 | Screw, M8 X 60 | 8 |
Z16-1-1 Water Pump, Dc12
| SC***33 | Pump | 1 |
| SC***21 | Screw, M8 X 40 | 2 |
| SC***19 | Screw, M8 X 30 | 7 |
Z17-1-1 Water Inlet, Connector
| SC***18 | Screw | 3 |
| SC***86 | Connector, Water Inlet | 1 |
| SC***16 | Gasket | 1 |
Z17-12-1 Water Bleed Pipe, Dc16
| SC***89 | Pipe, Bleed Assembly. | 1 |
| SC***15 | Hose, Bleed Assembly. | 1 |
| SC***86 | Connector, Bleed Pipe | 8 |
Z17-2-1 Water Bleed Pipe, Dc12
| SC***84 | Bolt | 1 |
| SC***46 | Bolt | 5 |
| SC***52 | Pipe | 1 |
Z18-1-1 Thermostat & Housing, Dc12
| SC***85 | Housing, Thermostat | 1 |
| SC***19 | Screw, M8 X 30 | 10 |
| SC***87 | O Ring | 1 |
Z18-11-1 Thermostat & Housing, Dc16
| SC***25 | Screw, M8 X 60 | 4 |
| SC***24 | Thermostat, 83 Degrees | 1 |
| SC***25 | Gasket, Thermostat | 1 |
Z19-11-1 Rocker Cover, Dc16
| SC***90 | Cover | 8 |
| SC***06 | Cap, Oil Filler | 1 |
| SC***66 | Gasket, Rocker Cover, Upper | 8 |
Z19-12-1 Breather Tube, Crankcase, Dc12
| SC***92 | Pipe, Crankcase, Ventilation | 1 |
| SC***89 | Screw, M6 X 16 | 3 |
| SC***21 | Screw, M8 X 40 | 4 |
Z19-2-1 Breather Tube, Crankcase, Dc12
| SC***20 | Screw | 1 |
| SC***82 | Pipe, Crankcase Breather | 1 |
| SC***32 | Nut, Flange M8 | 2 |
Z19-1-1 Rocker Cover, Dc12
| SC***51 | Gasket, Rocker Cover, Upper | 6 |
| SC***06 | Cap, Oil Filler | 1 |
| SC***19 | Screw, M8 X 30 | 24 |
Z20-11-1 Rocker Shaft, Assembly
| SC***10 | Screw, Adjusting | 1 |
| SC***89 | Arm, Rocker, Injector | 8 |
| SC***92 | Plug, Rivet | 8 |
Z20-1-1 Rocker Shaft, Assembly
| SC***10 | Screw, Adjusting | 1 |
| SC***89 | Arm, Rocker, Injector | 6 |
| SC***92 | Plug, Rivet | 6 |
Z21-1-1 Pushrods & Tappets, Dc12
| SC***02 | Circlip | 2 |
| SC***51 | Rod, Push | 4 |
| SC***45 | Rod, Push | 2 |
Z21-11-1 Pushrods & Tappets, Dc16
| SC***79 | Pushrod | 8 |
| SC***07 | Tappet, Roller | 2 |
| SC***46 | Bolt, Screw M10 X 60 | 16 |
Z22-11-1 Turbocharger, Dc16
| SC***94 | Turbocharger | 1 |
Z22-1-1 Turbocharger, Dc12
| SC***17 | Turbocharger | 1 |
| SC***39 | Turbocharger, Service Exchange | 1 |
Z23-12-1 Turbo Exhaust, Pipework
| SC***32 | Nut | 1 |
| SC***74 | Clamp, "V" | 1 |
| SC***01 | Pipe | 1 |
Z23-11-1 Turbo Pipework
| SC***44 | Adapter | 1 |
| SC***71 | Gasket | 1 |
| SC***98 | Adapter | 1 |
Z23-2-1 Turbo Exhaust, Pipework, Dc12
| SC***33 | Pipe, Exhaust Elbow | 1 |
| SC***32 | Nut | 1 |
| SC***37 | Clamp, "V" | 1 |
Z23-1-1 Turbo Pipework
| SC***71 | Gasket | 1 |
| SC***73 | Clamp | 2 |
| SC***98 | Adapter | 1 |
Z25-1-1 Induction Manifold, Dc12
| SC***18 | Screw | 4 |
| SC***82 | Plug | 1 |
| SC***67 | Banjo | 1 |
Z25-11-1 Induction Manifold
| SC***58 | Pipe, Flange | 2 |
| SC***33 | O Ring, Inlet Manifold | 2 |
| SC***19 | Screw, M8 X 30 | 8 |
Z26-1-1 Exhaust Manifold
| SC***40 | Gasket | 1 |
| SC***64 | Spacer | 2 |
| SC***99 | Manifold, Exhaust | 2 |
Z26-11-1 Exhaust Manifold
| SC***02 | Pipe, Expansion | 1 |
| SC***65 | Spacer | 8 |
| SC***67 | Manifold, Exhaust | 1 |
Z27-11-1 Cylinder Head, Assembly
| SC***02 | Spring, Exhaust Valve, Outer | 16 |
| SC***22 | Head | 8 |
| SC***30 | Valve, Exhaust | 16 |
Z27-1-1 Cylinder Head, Assembly
| SC***02 | Spring, Exhaust Valve, Outer | 12 |
| SC***30 | Valve, Exhaust | 12 |
| SC***22 | Valve, Intake | 12 |
Z29-11-1 Oil Cooler, Dc16
| SC***33 | Cooler, Oil | 1 |
| SC***77 | Cover | 1 |
| SC***13 | Gasket, Cooling System | 1 |
Z29-1-1 Oil Cooler, Dc12
| SC***98 | Gasket | 1 |
| SC***18 | Gasket | 1 |
| SC***54 | Adapter | 1 |
Z30-1-1 Oil Level Dipstick, & Tube, Dc12
| SC***24 | Ferrule | 1 |
| SC***48 | Dipstick | 1 |
| SC***37 | Clip | 1 |
Z30-11-1 Oil Level Dipstick, & Tube, Dc16
| SC***91 | Pipe | 1 |
| SC***47 | Adapter, Union, Straight | 1 |
| SC***26 | Flange Pipe | 1 |
Z31-1-1 Oil Sump, Dc12
| 33***93 | Plate, Cover | 1 |
| SC***14 | Washer, Sealing | 1 |
| SC***22 | Screw, M8 X 60 | 27 |
Z31-11-1 Oil Sump, Dc16
| SC***14 | Washer, Sealing | 1 |
| SC***22 | Screw, M8 X 60 | 26 |
| SC***35 | Insert | 1 |
Z32-2-1 Oil Pressure Sensor, Dc12
| SC***89 | Adapter | 1 |
| SC***45 | Pipe, Oil Pressure Sensor | 1 |
| SC***89 | Screw, M6 X 16 | 2 |
Z32-1-1 Oil Pump, Dc12
| SC***43 | Pipe | 1 |
| SC***22 | Screw, M8 X 60 | 4 |
| SC***46 | Pipe | 1 |
Z32-11-1 Oil Pump, Dc16
| SC***25 | Screw, M8 X 60 | 4 |
| SC***19 | Screw, M8 X 30 | 19 |
| SC***19 | O Ring | 2 |
Z33-11-1 Flywheel Assembly, Dc16
| SC***95 | Bolt, M16 X 90 | 10 |
| SC***13 | Gear, Flywheel Ring | 1 |
Z33-1-1 Flywheel Assembly, Dc12
| SC***95 | Bolt, M16 X 90 | 10 |
| SC***88 | Flywheel, Assembly | 1 |
| SC***13 | Gear, Flywheel Ring | 1 |
Z34-11-1 Flywheel Housing, Dc16
| SC***80 | O Ring | 1 |
| SC***07 | Gasket, Flywheel Housing | 1 |
| SC***83 | Seal, Rear Oil | 1 |
Z34-1-1 Flywheel Housing
| SC***80 | O Ring | 1 |
| SC***51 | Housing, Flywheel | 1 |
| SC***18 | Terminal, Cable, Flat Socket | 2 |
Z35-1-1 Camshaft, & Timing Gears, Dc12
| SC***77 | Bearing, Ball | 2 |
| SC***94 | Gear | 1 |
| SC***21 | Shaft | 2 |
Z35-11-1 Camshaft, & Timing Gears, Dc16
| SC***66 | Gear | 1 |
| SC***77 | Bearing, Ball | 1 |
| SC***94 | Gear | 1 |
Z36-12-1 Casing, Vibration Insulator, Dc16
| SC***60 | Gasket | 1 |
| SC***40 | Cover | 1 |
| SC***87 | O Ring | 1 |
Z36-11-1 Timing Case & Covers, Dc16
| SC***64 | Spring | 1 |
| SC***18 | Gasket | 2 |
| SC***10 | Stud, M10 X 50 | 2 |
Z36-1-1 Timing Case & Covers, Dc12
| SC***67 | Plug | 1 |
| SC***37 | Cover | 1 |
| SC***25 | Screw, M8 X 60 | 2 |
Z37-1-1 Piston & Con-Rod, Assemblies, Dc12
| SC***29 | Pin, Gudgeon | 1 |
| SC***59 | Bush, Small End | 1 |
| SC***67 | Bolt, Con-Rod, M12 X 72 | 2 |
Z37-11-1 Piston & Con-Rod, Assemblies, Dc16
| SC***29 | Pin, Gudgeon | 1 |
| SC***59 | Bush, Small End | 1 |
| SC***53 | Rod, Connecting | 8 |
Z38-11-1 Crankshaft Assembly, Dc16
| SC***16 | Crankshaft | 1 |
| SC***89 | Screw | 12 |
| SC***04 | Gear, Crankshaft | 1 |
Z38-1-1 Crankshaft Assembly, Dc12
| SC***84 | Ring, Sealing | 1 |
| SC***84 | Crankshaft, Assembly | 1 |
| SC***04 | Gear, Crankshaft | 1 |
Z39-1-1 Cylinder Block, Assembly, Dc12
| SC***08 | Tap, Drain | 1 |
| SC***18 | Terminal, Cable, Flat Socket | 2 |
| SC***89 | Screw, M6 X 16 | 1 |
Z39-11-1 Cylinder Block, Assembly, Dc16
| SC***93 | O Ring | 1 |
| SC***18 | Cover | 1 |
| SC***17 | Plate | 1 |
Z43-11-1 Air Filter, Installation, Dc16
| 32***64 | Clip, Overcentre | 5 |
| 32***98 | Cover, Filter End | 1 |
| 32***99 | O Ring | 1 |
Z43-1-1 Air Filter, Installation, Dc12
| 32***05 | Valve, Dump | 1 |
| 32***00 | Indicator, Restriction | 1 |
| 32***64 | Clip, Overcentre | 2 |
Z44-11-1 Air Induction Hoses
| SC***32 | Sensor | 1 |
| SC***69 | Hose | 1 |
| SC***86 | Clamp, Hose | 2 |
Z45-1-1 Exhaust Silencer, Open Build
| 32***00 | Silencer, Exhaust | 1 |
| 32***23 | Cap, Rain | 1 |
| 32***96 | Pipe, Exhaust Stub | 1 |
Z45-11-1 Exhaust System, Canopy Build
| 32***23 | Cap, Rain | 1 |
| 32***25 | Silencer | 1 |
| 32***66 | Clamp _u_ | 3 |
Z45-12-1 Exhaust System, Canopy Build
| 32***23 | Cap, Rain | 1 |
| 32***66 | Clamp _u_ | 3 |
| 32***99 | Silencer, Exhaust Reactive | 1 |
Z46-11-1 Fan Guards, Dc16
| 33***08 | Bracket | 1 |
| 33***09 | Washer | 19 |
| SC***63 | Washer | 2 |
Z46-1-1 Drive Belt Guard, Dc12
| 33***06 | Guard, Drive Belt, Upper | 1 |
| 33***07 | Washer | 2 |
| SC***05 | Bracket | 3 |
Z47-1-1 Cooler Assembly, Dc12
| 13***3D | Setscrew | 0 |
| 13***3D | Nut, M6 Lock | 0 |
| 30***68 | Radiator, Assembly | 1 |
Z47-11-1 Cooler Assembly, Dc16
| SC***45 | Tank, Expansion | 1 |
| SC***68 | Cap, Coolant Pressure | 1 |
| SC***67 | Sensor | 1 |
Z48-12-1 Charge Air Cooler, Hose & Pipework, Dc12
| SC***91 | Hose | 3 |
| SC***18 | Screw | 2 |
| SC***24 | Clamp, 'V' | 1 |
Z48-1-1 Radiator/Cooler, Hose & Pipework, Dc12
| 30***79 | Clip | 10 |
| 30***80 | Gasket, Flange | 1 |
| 30***81 | Plate, Clamping | 1 |
Z48-11-1 Radiator, Hose & Pipework, Dc16
| SC***65 | Gasket | 1 |
| SC***82 | Pipe | 1 |
| SC***92 | Gasket | 1 |
Z49-1-1 Cooling Fan & Spacer
Z50-1-1 Fuel Pipes, Fuel Tank To Filter
| 13***0D | Setscrew, M10 X 40mm | 4 |
| 13***3D | Nut, Self Lock M10 | 4 |
| 14***8D | Washer, M10 | 4 |
Z51-11-1 Fuel Filter, Sediment ( Racor )
| 32***11 | Filter, Fuel, Assembly | 1 |
| 32***12 | Element, Fuel Filter | 1 |
| 32***41 | O Ring | 1 |
Z57-1-1 Engine Oil Drain
| 14***21 | Seal, Bonded 3/4" Bsp | 1 |
| 22***03 | Clip, Jubilee | 2 |
| 32***71 | Adapter, 1/2"Bsp M 1/2"Tail | 2 |
Z60-1-1 Base & Fittings
| 13***8D | Setscrew, M10 X 30 | 0 |
| 13***8D | Setscrew, M16 X 30mm | 8 |
| 13***3D | Nut, Self Lock M10 | 0 |
Z60-2-1 Base & Fittings
| 13***8D | Setscrew, M10 X 30 | 0 |
| 13***8D | Setscrew, M16 X 30mm | 8 |
| 13***3D | Nut, Self Lock M10 | 0 |
Z60-11-1 Fuel Tank
| 32***18 | Cap, Fuel Tank | 1 |
| 32***65 | Gauge Fuel | 1 |
| 32***77 | Plug, 1.5"Bsp | 2 |
Z60-5-1 Lifting Bracket, (Optional)
| 13***6D | Bolt, M20 X 70mm | 8 |
| 13***3D | Nut, M20, 2.5 Pitch; San 10***25 | 8 |
| 14***2D | Washer, Plain | 16 |
Z61-2-1 Canopy, Middle Section
| 13***5D | Setscrew, M8x20 | 78 |
| 14***7D | Washer, M8 Plain | 78 |
| 14***7D | Washer, M8 Spring | 78 |
Z61-4-1 Canopy, Rear Section
| 13***5D | Setscrew, M8x20 | 20 |
| 14***7D | Washer, M8 Plain | 20 |
| 14***7D | Washer, M8 Spring | 20 |
Z61-1-1 Canopy Assembly
| 32***84 | Canopy, Assembly | 1 |
| 32***85 | Canopy, Middle Section | 1 |
| 32***86 | Canopy, Front Section | 1 |
Z61-3-1 Canopy, Front Section
| 13***5D | Setscrew, M8x20 | 28 |
| 13***7D | Setscrew, M10 X 25mm Long | 2 |
| 13***3D | Nut, Self Lock M10 | 2 |
Z61-21-1 Canopy Soundproofing
| 32***16 | Kit-Panel, Foam Backed, Centre Section | 1 |
| 32***17 | Kit-Panel, Sound Proofing, Centre Section | 1 |
| 32***18 | Kit-Panel, Foam Backed, Front Section | 1 |
Z62-2-1 Alternator, Hci444e
| 32***19 | Alternator | 1 |
| 32***22 | Kit-Rectifier | 1 |
| 32***23 | Regulator, As440; Sa465 See Bulletin | 1 |
Z62-11-1 Alternator, Accessories
| 13***8D | Bolt, M6 X 30 | 6 |
| 13***5D | Bolt, M10x35 | 8 |
| 13***3D | Nut, Self Lock M10 | 8 |
Z62-4-1 Alternator, Hci544d
| 32***22 | Kit-Rectifier | 1 |
| 32***23 | Regulator, As440; Sa465 See Bulletin | 1 |
| 32***24 | Bearing | 1 |
Z62-1-1 Alternator, Hci444d
| 32***02 | Alternator | 1 |
| 32***22 | Kit-Rectifier | 1 |
| 32***23 | Regulator, As440; Sa465 See Bulletin | 1 |
Z62-3-1 Alternator, Hci444f
| 32***21 | Alternator, Assembly | 1 |
| 32***22 | Kit-Rectifier | 1 |
| 32***23 | Regulator, As440; Sa465 See Bulletin | 1 |
Z63-1-1 Control Box & Panel, Assemblies
| 13***1D | Screw, Set M6x12 | 2 |
| 13***5D | Setscrew, M8x20 | 8 |
| 14***6D | Washer, M6 Plain | 2 |
Z64-1-1 Circuit Breaker Box, Assembly
| 13***8D | Bolt, M6 X 30 | 12 |
| 13***5D | Setscrew, M8x20 | 10 |
| 13***7D | Setscrew, M8x25 | 2 |
Z64-11-1 Circuit Breaker Box, Assembly
| 32***22 | Harness, Power | 1 |
| 32***70 | Harness, Power | 1 |
Z65-11-1 Battery Installation
| 13***5D | Setscrew, M8x20 | 2 |
| 13***5D | Setscrew, M10 X 20 | 4 |
| 13***3D | Nut, Self Lock M8 | 1 |
Z65-1-1 Engine Electrics
| 13***8D | Bolt, M10 X 30mm Lg | 2 |
| 14***8D | Washer, M10 | 2 |
| 14***8D | Washer, Spring, M10 | 2 |
Frequently asked questions
What engine does the JCB G380Q use?
The JCB G380Q uses a JCB-engineered diesel engine. Specific displacement and model details vary by production year and configuration, but it is designed for 1500 rpm operation to drive the Mecc Alte alternator.
What is the operating weight of the JCB G380Q?
The operating weight is not explicitly documented in the provided sources for the G380Q specifically. Weights vary by configuration, including the silenced enclosure, fuel tank capacity, and mounting frame. Consult the specific serial range data sheet for exact weight.
What model replaced the JCB G380Q?
The provided sources do not explicitly identify a direct successor model to the G380Q. The G-Series lineup includes the G330, G350, G400, G440, and G550, but replacement lineage for this specific 350 kVA unit is not documented.
What G380Q owners discuss
What engine generation and common failure modes are associated with early JCB 444 engines used in this series?
Early Dieselmax engines (Tier 2 and early Tier 3) are prone to big end bearing failures on the crankshaft. Fuel injection pump faults are also common on these earlier mechanical and early electronic engines. Worn piston rings are the most common cause of power loss, often requiring a rebuild rather than a repair. Unusual noises, such as a deep rhythmic knocking that gets louder under load, indicate serious internal problems that require immediate attention.
What are the typical hydraulic and steering issues reported for older JCB powertrains?
Hydraulic performance may degrade when the rear of the machine is lower than the front, suggesting the suction strainer is coming out of the oil or the suction hose has collapsed internally. The orbital steering valve is a common fault point on older models and often leaks. Low hydraulic oil levels can cause steering to respond slowly or not at all.
What electrical or sensor issues are commonly reported by JCB owners?
Starting problems are a frequent complaint, often linked to battery issues, fuel system faults, or electrical system failures. Faulty joysticks can cause the machine to refuse to start or crank over, even when neutral safety switches are engaged. Error codes related to ECU pairing faults may appear in the datalogger. Wiring harnesses on some JCB skid steer models have been reported as white, which can complicate diagnostics.
What are the known undercarriage or structural wear patterns for JCB machines?
Forks on JCB telehandlers and skid steers have been reported as flimsy and prone to falling off the boom. Hydraulic hoses on JCB skid steers are prone to blowing, with failures often attributed to poor crimping or regenerative pressure spikes rather than just age. Bucket engagement motors have been reported to break repeatedly in high-hour machines.
What specific checks should be performed when buying a used JCB G380Q generator set?
Verify the running hours and confirm the unit has undergone full load testing. Check the condition of the JCB engine for oil leaks and unusual noises. Inspect the UK-manufactured frame for corrosion. Ensure the three-phase output is stable at 350 kVA prime and 380 kVA standby. Check the control panel for stored trouble codes and verify the integrity of the wiring harness.
What fluid specifications are recommended for the JCB G380Q generator set?
The operation and maintenance manual for the JCB G330, G350, G380, G400, G440, and G550 series generator sets covers the G380Q. Specific fluid types and capacities are detailed in the manual's technical data section. Consult the factory spec sheet for the exact JCB fluid specifications required for the engine and hydraulic system.
How does the JCB G380Q handle load variations and what are its power ratings?
The JCB G380Q delivers 350 kVA of prime power and up to 380 kVA of standby power. It is designed for continuous and emergency use in industrial, commercial, and backup applications. The unit features selectable engine throttle modes, including H+ mode for high output requirements and heavy lifting operations, accessible via the throttle control dial switch or an additional switch.
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 G380Q. Related factory variants of the same model family:
G380Q
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