Part of the JCB Repair Manuals.
This JCB Service Manual covers the 506C, 506CHL, and 508C Loadall telehandlers, publication number 9803/3640U-8, for machines. Its 717 pages give the full factory workshop coverage for these models, which were fitted with A Series, R Series, JCB 444 Series, or JCB Dieselmax engines.
The manual is arranged by system: general information and torque settings, care and safety, attachments, body and framework, electrics, controls, hydraulics, transmissions, brakes, steering, and engine. Technical data tables provide the capacities, relief valve pressures, and torque figures for each variant.
Use it to shim and service the boom, overhaul the hydraulics, set the main relief valve to 238 bar, service the Syncro Shuttle or Powershift transmission, and trace circuits through the electrical section.
What's Inside This JCB 506C, 506CHL, 508C Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 2-39 | Introduction, Identifying Your Machine, Standard Torque Settings, Service Tools, Service Consumables, Terms and Definitions |
| Care and Safety | 40-57 | Safety Notices (Important Information, Operator Manual, Safety Warnings), Safety Check List (Safety - Yours and Others, Operating Safety, Maintenance Safety) |
| Attachments | 150-157 | Quick Release Couplings, Venting Hydraulic Pressure (Connecting and Disconnecting, Quick Release Couplings - Do's and Don'ts), Connecting Quick Release Couplings |
| Body and Framework | 158-191 | Service Procedures (Rivet Nuts, Slide Hammer Kit), Boom (Removal and Replacement, Shimming), Boom Chains (Servicing, Removal, Inspection and Replacement) |
| Electrics | 192-351 | Technical Data (Fuses and Relays), Basic System Operation (Circuit Schematics) |
| Controls | 352-359 | Dual Control Function Levers, Adjustment (Assembly), Fig 1, Fig 2, Fig 3, Fig 4 |
| Hydraulics | 360-459 | Technical Data (506C Machines, 506CHL and 508C Machines), Basic System Operation (Introduction to Hydraulic Schematic Symbols) |
| Transmissions | 460-641 | Technical Data (Syncro Shuttle, Powershift, Axles, Tyres, Recovery Procedure, Drive Paths), Fault Finding (Syncro Shuttle, Powershift) |
| Brakes | 642-671 | Technical Data (All Models), Basic Operation, Service Procedures (Brake Piston Seal Leakage, Introduction, Testing, Bleeding Procedure, Front Axle, Rear Axle) |
| Steering | 672-709 | Technical Data (506C, 506Chl & 508C), Basic System Operation (Hydraulic Steer Circuit) |
| Engine | 710-717 | Technical Data |
Documents This Manual Refers To
The manufacturer cites these publications by number. We carry them:
- Isuzu AA-6SD1T Service Manual — Wiring Diagrams (9806\/2240)
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Metric Grade 12.9 Fasteners (M10, Condition 1) | 80.0 Nm | p. 15 |
| Drive shaft oil seal protrusion (if dimension V is 16 to 16.30 mm) | 2 mm | p. 635 |
| JCB Multi-Gasket quantity | 50 ml | p. 37 |
| BSP Hose (1/4 inch) torque setting | 24.0 - 27.0 Nm | p. 18 |
| Ram end cap (51-8) torque | 678 Nm | p. 454 |
| UNF Grade 'S' Fasteners (Condition 1) - 1/4 inch bolt torque | 11.2 Nm | p. 14 |
| UNF Grade 'S' Fasteners (Condition 1) - 1 inch bolt torque | 814.0 Nm | p. 14 |
| Metric Grade 8.8 Fasteners (Condition 1) - M5 bolt torque | 5.8 Nm | p. 14 |
| Metric Grade 8.8 Fasteners (Condition 1) - M36 bolt torque | 2399.0 Nm | p. 14 |
| Hydraulic BSP Adaptors Torque - 1/4 inch | 18.0 Nm | p. 17 |
| Hydraulic BSP Adaptors Torque - 1 1/4 inch | 206.0 Nm | p. 17 |
| Engine Oil Capacity | 10 liters | p. 80 |
