Part of the JCB Repair Manuals.
All 1,255 pages of this JCB 446, 456 Wheeled Loading Shovel service manual PDF (OEM #9803/4180-11) are built for one machine family: the 446 and 456 Wheeled Loading Shovel, covering every production year from 1997 through 2004. Inside: complete hydraulic schematics for every circuit variant, from the early dual-pump 446 and 456 through the later tandem-pump configuration, plus wiring diagrams tracing every harness route from fuse block to diagnostic connector. You also get service schedules with calendar equivalents, fluid capacity tables, a full error codes section, and step-by-step procedures covering axles, WG 200 powershift transmission, brakes, and steering. Fill the hydraulic system to 215 litres, then torque your 7/8-14 SAE connections to 130-140 Nm. That's factory data, not a forum estimate. Your machine is down and parts quotes are rolling in. Download once, search by keyword, and pull up any spec or schematic right on your tablet at the machine.
What's Inside This JCB 446 & 456 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 3-39 | Introduction (Machine Model and Serial Number, Using the Service Manual, Section Numbering, Left Side, Right Side, Cross References, Identifying Your Machine, Machine Identification Plate, Typical Vehicle Identification Number, Typical Product Identification Number, Component Identification Plates) |
| Care and Safety | 40-59 | Safety Notices (Important Information, Operator Manual, Safety Warnings), Safety Check List (Safety - Yours and Others, Operating Safety, Maintenance Safety) |
| Routine Maintenance | 60-176 | Service Requirements (Introduction, Owner/Operator Support, Service/Maintenance Agreements, Initial Service and Inspection, Fit for Purpose Tests for Lifting Equipment, Obtaining Replacement Parts) |
| Attachments | 177-190 | Optional Attachments (Connecting/Disconnecting Hydraulic Hoses, Introduction, Connecting the Hydraulic Hoses, Disconnecting the Hydraulic Hoses, Quick Release Couplings) |
| Body and Framework | 191-344 | Technical Data (Air Conditioning Option), Basic Operation (Air Conditioning, R134a Refrigerant, System Operation, System Control, Safety Procedures) |
| Electrics | 345-716 | Technical Data (Electrical Data, General, Bulbs, Fuses and Relays to 539228, Fuses, Relays, Fuses and Relays From 540013, 539229, Primary Fuses, Diagnostic Connectors, Fuses and Relays From 540107, 539486, Fuses and Relays From 1169000, 1181000, Fuses and Relays, Fuses and Relays 456e From 1304000) |
| Hydraulics | 717-918 | Technical Data (Dual Pump, Primary Pump, Secondary Pump, Loader Valve, Pump, Tandem Pump, Auxiliary Relief Valves, From 1169000 Tandem Pump, Pumps, From 1169129, 446 From 1181004) |
| Transmission | 919-1156 | Technical Data (Axles 456, Unit Identification, Axles, Axles 446) |
| Brakes | 1157-1196 | Technical Data (and 456), Schematic Diagrams (Brake Circuit 456 to 539249, Brake Circuit) |
| Steering | 1197-1235 | Technical Data (Pump), Descriptions (General, Steering Valve - Operation, Emergency Steering - Operation) |
| Engine | 1236-1255 | Technical Data (456, 456E), Troubleshooting (Possible Faults), Cummins Engine and Transmission (Removal and Installation, Removal, Installation), Sump Drain Plug (Components) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| UNF Grade 'S' Fasteners (1/4 in bolt, Condition 1) | 11.2 Nm | p. 13 |
| Metric Grade 8.8 Fasteners (M5 bolt, Condition 1) | 5.8 Nm | p. 13 |
| Hydraulic System Capacity | 215 litres | p. 82 |
| Wheel Nut Torque | 600 Nm | p. 173 |
| Compressor Belt Slack | 5 mm | p. 116 |
| 456 from 1239000 | ||
| Engine Oil Capacity | 18.9 litres | p. 84 |
| 446 from 540000, 456 to 1169000 | ||
| Gearbox Oil Capacity | 28 litres | p. 82 |
| Fuel System Capacity | 325 litres | p. 82 |
| 456 from 1169000, 446 from 1181000 | ||
| Cooling System Capacity | 40 litres | p. 83 |
| 446 and 456 Models to 1169000 | ||
| ROPS/FOPS Mounting Bolts Torque | 330 Nm | p. 99 |
| 456 Models from 1169000 | ||
| ROPS/FOPS Mounting Bolts Torque | 270 Nm | p. 99 |
| 446 (Before 1181000) and 456 (Before 1169000), 446 (From 1181000) | ||
| Engine Valve Clearance (cold) - Inlet | 0.30mm | p. 1240 |
JCB 446 & 456 Common Problems This Manual Covers
JCB 456 Wheeled Loading Shovel engine cranks but won't start in cold weather, blowing thick white smoke. p. 1242
Inspect the fuel injectors and verify injection timing. Measure the cold inlet engine valve clearance on page 1240. Adjust the clearance to exactly 0.30mm for models before 1169000. Test engine compression if the issue persists after adjustment and verify fuel line pressure.
Manual Section: Engine TroubleshootingAutomatic transmission shifts erratically or gets stuck in gear with active ZF error codes on the dash display.
Check the active ZF fault codes using the reference. Drain the transmission fluid and inspect the magnetic plug for metal shavings. Fill the gearbox with exactly 28 litres of fluid for models prior to 1169000. Clear the codes and test drive the machine.
Manual Section: Transmission Functional Testing and Fault FindingMachine rolls on inclines when parked or displays a warning light for low parking brake holding force. p. 1161
Test the park brake operating pressure at the remote test point. Verify the gauge reads exactly 80 bar as specified on page 1161. Adjust the control valve if pressure drops below this threshold. Inspect the brake pads for uneven wear and replace any damaged seals.
Manual Section: Brake System TestingLack of power in all hydraulic functions with slow loader arms and whining noise from the main pump. p. 724
Inspect the main pump suction lines for air leaks. Replace the hydraulic tank return filter with a new 10 Micron element as detailed on page 724. Drain the system and refill with clean hydraulic fluid. Measure standby pressure at the loader valve block and adjust accordingly.
Manual Section: Hydraulic System Fault Finding - GeneralFrequently Asked Questions
How to reset JCB 446/456 error codes after service?
After completing service, you can clear the EMS memory by clicking on the 'Reset Logs' icon as described on page 397. Alternatively, to erase previously active fault codes, navigate to the 'Engine Diagnosis' screen (page 412) and click the button identified as item 39.
Torque specs for JCB 446/456 wheel loader fasteners (UNF Grade S and metric Grade 8.8)?
For UNF Grade 'S' fasteners, a 1/4 inch bolt requires 11.2 Nm (8.3 lbf ft) for Condition 1. For Metric Grade 8.8 fasteners, an M5 bolt requires 5.8 Nm (4.3 lbf ft) for Condition 1. These values are provided in tables for various bolt sizes and conditions.
What are the fault/error codes for JCB 456 wheel loader and how to clear them?
The manual provides a table of ZF Error Codes, including FC, SPN, FMI, and IC, along with descriptions and repair procedures. For example, FC 11, SPN 5000, FMI 12, IC 48 indicates 'A Logical Error for the Selected Gear Range'. To clear these codes, the operator can erase all previously active fault codes by clicking the button identified as item 39 on the 'Engine Diagnosis' screen (page 412).
Production years of JCB 446 and 456 wheeled loaders?
The JCB 456 Wheeled Loading Shovel is from serial number 539000, and the 446 Wheeled Loading Shovel is from serial number 540013. The Year of Manufacture can be identified from the VIN, with codes like 'P = 1993' or '4 = 2004'. For later models, the year digit was removed, and the serial number increased to 8 digits.
What do I get after purchasing this JCB 446 & variants manual?
This is a 1255-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Can I print specific sections of this Service Manual?
The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
Does this JCB 446 & variants manual include wiring diagrams?
Yes. You'll find full electrical schematics with wire routing diagrams, connector identification, and circuit descriptions.
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