Part of the JCB Operator Manuals.
This is the JCB 3C MK III and 3D MK III Operator's Manual (publication 9801/3600S, issue 4) for these backhoe loaders from machine number 125000 onward. Across 166 pages it explains how to run and look after the machine safely and correctly.It walks through the cab layout and controls, shovel and excavator operation, personal safety, and the routine maintenance an operator handles: greasing, engine, fuel, hydraulic and electrical checks. Optional equipment such as buckets, the JCB jaw, extending dipper and road breaker is covered too.A full specifications and service section lists capacities, service schedules and machine data, with the warranty procedure at the back. For owners keeping a classic 3C or 3D backhoe working, it is the reference for day to day operation and scheduled servicing.
What's Inside This JCB 3C MK III, 3D MK III Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 3-9 | Introduction (Warranty, Registration Card, Free Service Vouchers, Routine Service Vouchers), Service Contract, Personal Safety (Protection) |
| Operation | 10-51 | Cab Layout (Throttle Lever, Seat Adjustment, Rearscreen Wiper, Generator Warning Light, Oil Pressure Warning Light, Rear Window Stowage Pins and Tubes, Shovel Controls, Excavator Controls) |
| Maintenance | 52-97 | Machine Care (Greasing, Engine, Oil, Fuel System, Hydraulics, Electrics) |
| Optional Equipment | 98-116 | Buckets, Attachments, Jcb Jaw, Jcb Extending Dipper, Road Breaker, Power Breaker, Refuelling Pump |
| Specifications and Service | 117-159 | Specification (Service: Contract, Vouchers, Schedule), All Machines (Engine, Transmission, Steering, Brakes) |
| Warranty and Procedure | 160-166 | Warranty and Procedure - Uk and Eire |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Battery Voltage and Capacity | 12 volt - 128 amp/hr at 20 hr rate | p. 122 |
| Alternator Output | 43 amp | p. 122 |
| Engine Fan Belt Slack (for alternator adjustment) | 13 mm (0.5 in.) | p. 72 |
| Engine Oil Filter Renewal Interval | 200 Hours | p. 63 |
| 3C MK III | ||
| Hydraulic System Capacity | 195 Litre / 43 Gal | p. 119 |
| 3D MK III | ||
| Hydraulic System Capacity | 204 Litre / 45 Gal | p. 119 |
| 3C | ||
| Engine Oil Capacity (Balanced, Steel Sump) | 9.6 Litre | p. 119 |
| Fuel Tank Capacity | 68 Litre | p. 119 |
| Cooling System Capacity | 13.6 Litre | p. 119 |
| Gearbox Oil Capacity (10 Speed) | 50 Litre | p. 119 |
| Torque Converter Oil Capacity (Build/3) | 20.4 Litre | p. 119 |
| Hydraulic System Capacity (including tank) | 195 Litre | p. 119 |
JCB 3C MK III, 3D MK III Common Problems This Manual Covers
Dead battery or no-start condition
A backhoe that will not start or seems electrically dead often has a weak battery or a charging fault rather than a starter problem. The Maintenance section covers the electrics and battery checks that an operator carries out.
Manual Section: Maintenance p. 52Alternator not charging
Losing electrical power after the engine is running usually means the alternator is not charging. The Maintenance section covers the electrical system checks and fan belt adjustment that affect charging.
Manual Section: Maintenance p. 52Slack fan belt affecting charging
A loose fan belt slips and undercharges the battery. The Maintenance section explains the fan belt adjustment, which the schedule calls for at regular intervals.
Manual Section: Maintenance p. 52Hydraulic functions weak or noisy
Weak or inconsistent loader and backhoe response commonly comes from low fluid or leaks. The Maintenance section covers the hydraulic checks, and the fluid level must be read with the loader and backhoe in the travel position for a correct result.
Manual Section: Maintenance p. 52Unfamiliar cab controls
New operators mishandle the shovel and excavator controls when the layout is unclear, which is a safety risk. The Operation section explains the cab layout, throttle, seat adjustment, warning lights and the shovel and excavator controls.
Manual Section: Operation p. 10Wrong fluids or service intervals
Using the wrong capacity or skipping an interval shortens component life. The Specifications and Service section lists engine, transmission, steering and brake data along with the service schedule.
Manual Section: Specifications and Service p. 117Frequently Asked Questions
Which machines does this manual cover?
It is the operator's manual for the JCB 3C MK III and 3D MK III backhoe loaders from machine number 125000 onward.
Is this an operator manual or a full service manual?
This is the operator's manual. It covers safe operation, the cab controls, optional equipment and the routine maintenance an operator handles, plus a specifications and service reference, rather than full workshop overhaul procedures.
Does it list capacities and service intervals?
Yes. The Specifications and Service section lists engine, transmission, steering and brake data along with the service schedule and vouchers. p. 117
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