Part of the JCB Repair Manuals.
Looking for the factory tear-down steps for your excavator? This 351-page JCB 8056, Isuzu 4JG1PBW service manual PDF (OEM #9803/9296-1) breaks down the complete hydraulic system, track motors, and slew ring assembly. Inside, you get complete hydraulic schematics tracing every circuit, plus detailed wiring diagrams to chase down stubborn electrical gremlins. Open up to the troubleshooting sections for clear fault-finding steps covering the control valves, auxiliary relief valves, and track motor gearboxes. Verify your 2.2kW starter motor is pulling correct voltage before tearing into the harness, and ensure the hydraulic filter main bypass pressure is holding at exactly 1.5 bar. Down time kills your profit margin. Grab this searchable download, pull it up on your shop tablet, and get the iron moving again.
Complete the set for your 8056, ISUZU 4JG1PBW
- Operator Manual: JCB 8056 Operator Manual
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 2-34 | Standard Torque Settings, Service Tools |
| Care and Safety | 35-50 | Safety Check List |
| Maintenance | 51-95 | Health and Safety, Service Schedules, Greasing, Electrical System, Fuel System, Hydraulic System, Tracks and Running Gear |
| Attachments | 96-104 | Bucket |
| Body and Framework | 105-147 | Technical Data, Air Conditioning, Service Procedures, Slew Ring |
| Electrics | 148-180 | Service Procedures, Harness Data |
| Controls | 181-198 | Servo Hand Controllers |
| Hydraulics | 199-323 | Basic System Operation, Fault Finding, Hydraulic Pump, Control Valve, Auxiliary Relief Valves, Pressure Maintenance Valve and Dual Solenoid Valve, Track Motor/Gearbox |
| Gearboxes | 324-328 | Slew Motor/Gearbox, Track Motor/Gearbox, Removal and Replacement, Dismantling and Assembly, Fault Finding |
| Track and Running Gear | 329-346 | Idler and Recoil Unit |
| Engine | 347-351 | Technical Data, General |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Metric Grade 8.8 Fasteners (M10, Condition 1) | 47.0 Nm | p. 11 |
| Hydraulic Filter Main Bypass pressure | 1.5 bar (22 lbf/in2) | p. 205 |
| Air Cleaner Element replacement | Change (procedure described) | p. 82 |
| Starter Motor Power | 2.2kW | p. 152 |
| Battery Voltage | 12 V | p. 152 |
| BSP Hose Torque Setting (1/2 inch) | 44.0 - 50.0 Nm | p. 15 |
| JCB Multi-Gasket quantity | 50 ml | p. 34 |
| Track Rollers Bolt Torque (Item C) | 244 Nm | p. 337 |
| Idler Recoil Spring length X | 263 mm (10.5 in) | p. 346 |
| Bucket Ram Pivot pin Reference value | 44.9 mm dia. | p. 135 |
| Fuel Tank Capacity | 70 Litres | p. 65 |
| Engine Oil Capacity (first 500 hours) | 9.6 Litres | p. 65 |
