This is the JCB service manual (publication 9803/3250) for the 3C, 3CX, 3D and 4C excavator loader range, including the 3CX Turbo Sitemaster, 4C Turbo, 4CN and the 1400B, 1550B and 1700B variants built from machine serial number 290000. It covers machines fitted with the Leyland 4/98 and Perkins 4.236 and T4.236 engines.Across 458 pages it works through every major system: hydraulics, attachments, engine, transmission and shuttle reverser, axles, brakes, hydraulic steering and electrics, plus service schedules, lubricant capacities and torque settings. You get technical data, wear tolerances, pressure figures and step by step repair procedures written for JCB service engineers.Use it to diagnose a weak or drifting hydraulic system, rebuild the Hamworthy pump, service the shuttle reverser, set relief valve pressures or trace a charging fault. The PDF has a text layer and bookmarks, so you can search it and jump straight to the section you need.
What's Inside This JCB Excavator-Loader Range Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 1-17 | Introduction, Lubricants and Capacities, Torque Settings, Service Schedule, Excavator Greasing |
| Hydraulics | 18-162 | Technical Data (Pump, Main Relief Valve Pressures to Machine No. 306000, Main Relief Valve Pressures From Machine No. 306001 to 310999, Main Relief Valve Pressures From Machine No. 311000) |
| Attachments | 163-189 | Machine Neutral Circuit with Roadbreaker to M/C No. 295695, Machine Neutral Circuit with Roadbreaker From M/C No. 295696, Machine Neutral Circuit with Seventh Spool |
| Body & Framework | 190-210 | Glass Doors & Frameless Windows, Cab Heater Air Filter, In Cab Boom/Slew Lock, Boom/Slew Lock Master Cylinder, Boom/Slew Lock Slave Cylinder, Slew Actuator Operation |
| Engine | 211-232 | Technical Data, Engine Oil & Filter, Fuel System, Cooling System, Fan Belt, Air Filter |
| Transmission | 233-320 | Technical Data, Towing Procedure, Shuttle Reverser Maintenance, Shuttle Reverser Operation, Shuttle Reverser Components, Shuttle Reverser Testing and Fault Finding |
| Axles | 321-374 | Technical Data (Drive Axle - Rear, Drive Axle - Front, Steer Axle, Tyre Pressures), Drive Axle Oil, Crownwheel Assembly, Drive Axle - Rear, Rigid Drive Axle |
| Brakes | 375-384 | Technical Data, Parking Brake, Brake System Bleeding Procedure, Service Brake, Master Cylinder |
| Hydraulic Steering | 385-404 | Technical Data, Steering Circuit, Flow Regulating Valve Operation, Steer Pump, Power Steering Operation, Hydraulic Steering Unit, Steering Column, Steering Ram Operation |
| Electrics | 405-436 | Technical Data, Batteries, Alternators, Charging Circuit Check, Starting Circuit Test, Starter Motor - Lucas M50 and M127, Circuit Diagram |
| Service Tools | 437-450 | Service Tool Numerical List, Hydraulics Tools, Attachments Tools, Transmission Tools, Axles Tools, Steering Tools, Sealing and Retaining Compounds |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| 2WD models | ||
| Wheel bolts torque | 405 Nm (300 Ibf ft) | p. 340 |
| All Models | ||
| Typical ram piston head torque | 405 Nm (41 kgf m, 300 Ibf ft) | p. 139 |
| Typical ram end cap torque | 678 Nm (69 kgf m, 500 Ibf ft) | p. 139 |
| Hydraulic filter element replacement interval | 500 Hours | p. 20 |
| Air filter outer element replacement interval | 1000 Hours | p. 228 |
| Air filter inner element replacement interval | 2000 Hours | p. 228 |
| Shuttle Reverser Forward Clutch pack clearance | 0.3 to 1.2mm (0.011 to 0.046in.) | p. 251 |
| JCB Transmission end plate end-float | 3.6 to 4.4 mm (0.140 to 0.170 in) | p. 295 |
| Hamworthy Pump bolt 3 torque | 203 Nm (21 kgf m, 150 Ibf ft) | p. 25 |
| all up to m/c no. 296220 | ||
| Hydraulic filter nut C torque (Original filter to m/c no. 296220) | 88 Nm (65 Ibf ft) | p. 20 |
| 4/98NT, 4/98TT | ||
| Fuel filter element replacement interval (4/98 Engine) | 500 Hours | p. 216 |
| 4.236 (LD), T4.236 (LH), T4.236 (LJ) | ||
| Fuel filter element replacement interval (4.236 Engine) | 500 hours | p. 217 |
JCB Excavator-Loader Range Common Problems This Manual Covers
Loss of drive or shuttle slipping
High-hour 3CX and 4CX machines commonly hesitate, slip, or lose forward and reverse drive as the shuttle reverser clutch packs wear. The Transmission section gives clutch pack clearances, shuttle reverser operation and fault finding to trace it.
Manual Section: Transmission p. 233Weak or drifting hydraulics
Sluggish boom, dipper or bucket response and slow lift on older backhoe loaders usually points to pump wear, low fluid or clogged filters rather than a fault code. The Hydraulics section covers pump specs, relief valve pressures and filter service.
Manual Section: Hydraulics p. 18Loader or backhoe drops after shutdown
If the loader or excavator creeps down while held or after the engine stops, the cause is internal leakage in the cylinders or load-hold check valves. The Hydraulics section documents the load hold check valve operation and valve testing.
Manual Section: Hydraulics p. 18Hard starting, low power or overheating
Fuel restriction, injector wear, air ingress or a blocked cooling system leave the 4/98 and 4.236 engines hard to start, down on power or running hot. The Engine section covers the fuel system, cooling system and engine technical data.
Manual Section: Engine p. 211Steering play or wander
Age and wear in the steer pump, hydraulic steering unit and steering rams show up as play, drift or heavy steering. The Hydraulic Steering section gives the steering circuit, pump wear tolerances and relief valve operating pressure.
Manual Section: Hydraulic Steering p. 385Poor traction or 4WD engagement
Wheel slip and unstable pushing or loading can come from differential and 4WD engagement problems or drivetrain wear on the front and rear axles. The Axles section covers axle technical data, the crownwheel assembly and drive axle service.
Manual Section: Axles p. 321Frequently Asked Questions
Which JCB machines does this manual cover?
It is the excavator loader service manual for the 3C, 3CX, 3D and 4C range, including the 3CX Turbo Sitemaster, 4C Turbo, 4CN and the 3C 1400B, 3C 1550B and 3D 1700B variants, all from machine serial number 290000.
Which engines are included?
The manual covers machines built with the Leyland 4/98 (NT and TT) and the Perkins 4.236 (LD) and T4.236 (LH and LJ) engines. The Engine section gives technical data, fuel system and cooling system procedures for these units. p. 211
What is the torque for the wheel bolts?
The manual lists wheel bolt torque and full axle specifications in the Axles section, along with drive axle, steer axle and tyre pressure data. Copy the exact figure from the section when you carry out the work. p. 321
Does it cover hydraulic pump and relief valve work?
Yes. The Hydraulics section runs from pump operation and the Hamworthy and double pump wear tolerances and bolt torques through to the main relief valve pressures for the different machine number ranges. p. 18
What do I get after purchasing this JCB EXCAVATOR LOADER & variants manual?
Download the full 458-page searchable Service Manual immediately. Open it on any device: the laptop at your desk or a phone out in the field.
Are there any print restrictions on this manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Are there hydraulic schematics in this JCB EXCAVATOR LOADER & variants manual?
Yes, this JCB EXCAVATOR LOADER & variants Service Manual includes hydraulic system diagrams, circuit schematics, and component specifications.
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