JCB 506C, 506CHL, 508C Telehandler Service & Repair Manual – 2006 (P/N 9803/3640U-8)

JCB service manual P/N 9803/3640U-8 covers the 506C from S/N 579781 and 506CHL and 508C from S/N 579569. Machine serial numbers determine applicability, with additional distinctions for engine installations, transmissions, and production changes.

Text Search, Navigation, and Diagram Detail

Finding information: PDF text search and embedded bookmarks are not available. Use the printed section contents and page references to locate procedures. Small wiring codes, connector numbers, and hydraulic labels require magnification; sideways drawings are easier to follow after rotating the page.

The download contains one printable, English-language 696-page PDF, including section contents pages, two section dividers, five intentionally blank pages, and 17 repeated hydraulic pages.

Boom, Hydraulic, and Drivetrain Service

The following selected topics show the main service areas rather than reproduce the full contents. Other covered work includes dual-control function lever assembly and adjustment, plus cab glass replacement.

• Boom and framework: Boom removal, wear-pad inspection and shimming, chain servicing, attachment couplings, and removal of the cab and combined fuel/hydraulic tank.

• Hydraulics: Circuit explanations, ram-creep fault finding, pressure tests, control-valve service, pump and fan-motor work, and ram disassembly, resealing, and bleeding.

• Transmission and axles: Step-by-step Syncro Shuttle and Powershift overhaul procedures, clutch-leakage tests, torque-converter checks, epicyclic hubs, driveheads, and pinion-depth setup.

• Electrical diagnosis: Wiring diagrams, harness interconnections, connector repairs, starter and alternator tests, and charging- and starting-circuit voltage-drop checks.

• Brakes and steering: Brake-piston seal leakage tests, master-cylinder service, parking-brake adjustment, steering-unit repair, bleeding, and road-wheel rephasing.

• Maintenance and engine data: Engine-family-specific service schedules, fluid and lubricant tables, fuel-system priming, and specifications for A-Series, R-Series, and JCB 444/Dieselmax engines.

The manual is written for JCB distributor service engineers receiving or having completed JCB technical training, with workshop knowledge and experience maintaining hydraulic earthmoving equipment.

Machine Identification and Scheduled Checks

VIN/PIN explanations and engine, transmission, and axle identification information help match the installed assemblies to the appropriate procedures and specifications.

A/R-Series and Dieselmax machines have separate maintenance schedules. Tasks run from daily checks through two-year service, with the Dieselmax schedule extending to 6,000 hours/six years.

Functional inspections cover transmission operation and main-line pressure, torque-converter stall speed, steering and phasing, MRV and ARV pressures, fan speed, hose-burst protection valves, and chassis leveling. Load Moment Indicator checking/calibration is also listed in the schedules.

Torque References, Fluids, and Service Tools

Eleven standard torque tables, Tables 2–12, address UNF Grade S fasteners, metric grades 8.8/10.9/12.9, rivet nuts, internal-hex capscrews, BSP/SAE hydraulic connections, bonded washers, and Torque Stop hoses. The tables distinguish fastener finishes and lubrication conditions.

Tool references include the 892/00905 Load Moment Indicator test box, 892/00253 hydraulic pressure-test kit, flow-testing equipment, ram service tools, and 992/04000 torque multiplier.

Fluid tables distinguish A/R-Series from Dieselmax installations and separate Powershift and Syncro Shuttle transmission capacities where applicable. Hydraulic quantities describe nominal tank capacity; total system volume varies with equipment. Coolant, fuel, axle, and lubricant specifications are also included.

Hydraulic and Brake Variants

Hydraulic fault tables address weak or slow operation, ram creep, and parallel-lift faults. Pump and fan-motor instructions distinguish resealing an externally leaking unit from replacing a worn or low-output assembly. Revised pump arrangements and fan-motor procedures are identified from S/N 1184000.

Parking-brake service separates machines through S/N 586873 from those starting at S/N 586874. Later caliper instructions distinguish Type 1 and Type 2 components. Master-cylinder resealing is covered, while a faulty servo unit requires replacement.

For raised-boom work or an opened hydraulic circuit, the manual specifies the required boom support and release of stored hydraulic pressure.

Transmission Overhaul and Axle Repair

PS700 instructions distinguish reverser-shaft cover-plate and sealing-plug versions. PS750 clutch-pack procedures are separate, supported by PS700 Section Views and Torque Figures and PS750 Section Views and Torque Figures.

Main-line, individual-clutch, converter, and cooler pressure/flow tests support diagnosis before disassembly. Gear-selection and clutch-engagement information helps identify a leaking clutch instead of treating every loss of drive as the same fault.

Front/rear axle removal and spiral-bevel drivehead repair are supplemented by SD55 splined-hub and driveshaft procedures, shaft-seal wear-sleeve repairs, and bearing-carrier seal information.

PTFE piston-ring seals can be cut during assembly if they project above the shaft. Exceeding the specified rolling torque can over-compress a collapsible spacer and require its replacement.

Wiring and Hydraulic Circuit References

Electrical references include Syncro Shuttle Machines S/N 585397 to 587635 and Harness Data – Drawings and Interconnection, together with Powershift and later JCB 444 wiring. Harness drawings connect wire and connector references across machine assemblies.

The 506CHL and 508C Machines hydraulic schematic and Hydraulic Steer Circuit show component relationships for tracing hydraulic and steering operation.

Engine Data and Separate Overhaul Manuals

Section K contains technical data for A-Series AA/AB/AK/AR, R-Series RE/RG, and JCB 444 SA/SB builds. Routine maintenance covers engine-family-specific fuel-system priming, but full internal engine overhaul is outside this manual’s scope.

Further engine work is referred to separate publications: 9806/0100 for AA, 9806/2140 for AR/AK, 9806/2240 for RE/RG, and 9806/3000 for JCB 444. The JCB 444 alternator and starter disassembly references also lead to the separate engine manual. These publications are not included.

Selected Priority-Valve and Steering Specifications

For earlier 506C machines with the pump-mounted priority valve, maximum excess-port pressure is 235 bar through S/N 587635 and 205 bar from S/N 587636.

The 506C steering-unit load-sense relief specification is 175 bar for earlier machines and 190 bar from S/N 1184000.