Looking for the factory repair procedures for your 2000-2010 wheeled loading shovel? This 590-page JCB 406 service manual pdf (OEM #9803/4310-05) breaks down every transmission drop-box, articulated joint, and hydraulic steering unit for the 406 and 409 models. You get detailed wiring diagrams mapping the entire electrical system and full hydraulic schematics covering the steering priority valves and loader controls. Open up the fault-finding sections to chase down basic engine issues, then reference the extensive torque tables before reassembling the axles. When installing the front axle driveshaft to the coupling flange, tighten the bolts to 41 Nm and secure the hydraulic system filter cap to 40 Nm. Don't waste another hour guessing at clearances and pressures. Download this file directly to your tablet, jump to the exact schematic, and get your loader back in the dirt.
What's Inside This JCB JCB 406 & 409 Wheeled Loading Shovel Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 1-40 | Schematic Codes, Machine Identification, Torque Settings, Service Tools, Service Consumables |
| Care and Safety | 41-51 | Safety Check List, General Safety, Operating Safety, Maintenance Safety, Safety Decals |
| Routine Maintenance | 52-127 | Service Requirements, Service Schedules, Fluids/Lubricants/Capacities, Prepare Machine for Maintenance, Greasing, Electrical System |
| Section a - Attachments | 128-132 | Quick Release Couplings, Connecting Couplings, Disconnecting Couplings, Safety Warnings |
| Section B - Body and Framework | 133-163 | Service Tools, Direct Glazing, Cab Removal/Replacement, Engine Cover Removal/Replacement, Articulated Joint, Quickhitch |
| Section C - Electrics | 164-273 | Technical Data, Fuses and Relays, Battery Maintenance/Testing, Wiring Harness Repair, Starter Motor, Alternator |
| Section D - Controls | 274-280 | Control Rods and Linkages, Loader Valve Controls, Dismantle and Assemble, Adjustment |
| Section E - Hydraulics | 281-414 | Technical Data, Service Tools, Functional Descriptions, Schematic Circuits, Connect/Disconnect Hoses, Relief-Valve Testing |
| Section F - Transmission | 415-526 | Technical Data, Service Tools, Towing Procedure, Axles Removal/Installation, Hubs and Driveshaft, Transmission Drop-Box |
| Section G - Brakes | 527-546 | Technical Data, Bleeding Brake System, Adjusting Park Brake Cable, Dismantling/Assembly Park Brake, Shim Calculation |
| Section H - Steering | 547-580 | Technical Data, Basic Operation, Pressure Testing, Priority-Valve Removal/Installation, Hydraulic Steering Unit, Fault Finding |
| Section K - Engine | 581-590 | Technical Data (406), Technical Data (409), Basic Engine Fault Diagnostics |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Front Axle Driveshaft to Coupling Flange Bolt Torque | 41 Nm (4.18 Kgf m, 30.24 lbf ft) | p. 425 |
| Front Axle U-bolt Nut Torque | 600 Nm (61.2 Kgf m, 443 lbf ft) | p. 425 |
| Hydraulic System Filter Cap Torque | 40 Nm (29.5 lbf ft) | p. 117 |
| Engine Air Filter Inner Element Replacement | Every other time outer element is changed | p. 108 |
| Fuel Filter Tightening | Tighten the bowl a further quarter of a turn (after hand-tight) | p. 111 |
| BSP Hose to Adaptor Torque (example for 1/8 in. BSP) | 14.0 - 16.00 Nm (1.4 - 1.6 kgf m, 10.3 - 11.8 lbf ft) | p. 18 |
| Battery Type and Capacity | JCB 729/10663 Type 663 Wet 12 Volts 115 Amp/hour | p. 168 |
| Alternator Nuts to Blower-Housing Torque | 4 Nm (35.4 lbf-in) | p. 268 |
| Rotor to Blower Inlet-Jacket Clearance (Alternator) | Minimum 0.2 mm (0.0078 in.), Maximum 0.8 mm (0.031 in.) | p. 270 |
| Drive Belt Tension (Deflection) | 15 mm (5/8 in.) | p. 105 |
| Drive Belt Tension (Force) | Approximately 210N | p. 105 |
| O-rings, Seals and Gaskets Replacement | Renew whenever disturbed unless otherwise instructed | p. 49 |
JCB JCB 406 & 409 Wheeled Loading Shovel Common Problems This Manual Covers
JCB 406 loader loses forward and reverse drive under load or fails to reach driving speed completely. p. 425
Inspect the front axle driveshaft coupling. Torque the front axle driveshaft to coupling flange bolts to exactly 41 Nm (30.24 lbf ft) as detailed on page 425. If the machine still lacks pulling power, check the hydrostatic motor pressures immediately.
Manual Section: Section F - TransmissionEngine starts poorly, stalls out frequently, or triggers low oil pressure warning lamp at low idle. p. 585
Test the oil pressure at low idle to ensure it maintains at least 1.4 bar as specified on page 585 for F4L 2011 engines. If pressure drops below this threshold, verify the oil level is above the 11 Litres minimum capacity listed on page 68.
Manual Section: Section K - EngineLoader arms and bucket respond slowly, operate jerkily, or completely fail to lift heavy material.
Drain the hydraulic tank and replace the main filter. Torque the hydraulic system filter cap to exactly 40 Nm (29.5 lbf ft) as instructed on page 117. Review for main hydraulic services troubleshooting to isolate main tandem pump cavitation issues.
Manual Section: Main Hydraulic Services Fault FindingCoolant temperature gauge spikes rapidly during normal work cycle or alternator warning light suddenly turns on. p. 105
Measure the drive belt deflection to confirm it sits at 15 mm (5/8 in.) as shown on page 105. Adjust the tension if it feels loose. Check the alternator nuts to blower-housing torque, tightening them to 4 Nm (35.4 lbf-in) using page 268 guidelines.
Manual Section: Section C - ElectricsVisible hydraulic fluid leaks appear around the loader control valve or tandem pump shaft seals. p. 18
Replace the leaking hoses and renew O-rings and seals whenever disturbed per page 49 instructions. Torque the 1/8 in. BSP hose to adaptor connections to 14.0 - 16.00 Nm (10.3 - 11.8 lbf ft) following the specifications on page 18.
Manual Section: Section E - HydraulicsFrequently Asked Questions
What are the torque specs for JCB 406 wheel loader bolts?
The manual provides general torque settings for various bolt types and grades. 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. Metric Grade 10.9 and 12.9 fasteners have higher torque values, for example, an M5 Grade 10.9 bolt requires 8.1 Nm (6.0 lbf ft) for Condition 1. These values are for dry threads; lubricated threads may be reduced by one third.
How do you fix JCB 406 loader loses forward and reverse drive under load or fails to reach driving speed completely?
Inspect the front axle driveshaft coupling. Torque the front axle driveshaft to coupling flange bolts to exactly 41 Nm (30.24 lbf ft) as detailed on page 425. If the machine still lacks pulling power, check the hydrostatic motor pressures immediately.
How do you fix engine starts poorly, stalls out frequently, or triggers low oil pressure warning lamp at low idle?
Test the oil pressure at low idle to ensure it maintains at least 1.4 bar as specified on page 585 for F4L 2011 engines. If pressure drops below this threshold, verify the oil level is above the 11 Litres minimum capacity listed on page 68.
How do you fix loader arms and bucket respond slowly, operate jerkily, or completely fail to lift heavy material?
Drain the hydraulic tank and replace the main filter. Torque the hydraulic system filter cap to exactly 40 Nm (29.5 lbf ft) as instructed on page 117. Review for main hydraulic services troubleshooting to isolate main tandem pump cavitation issues.
What do I get after purchasing this JCB 406 & variants manual?
Immediate download of the complete 590-page searchable Service Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Is this JCB 406 & variants Service Manual printable?
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 406 & variants manual?
Included. Hydraulic system schematics cover all circuits, control valves, and component specifications for the JCB 406 & variants.
Document Quality
This document is a scanned manual with an OCR layer, allowing you to search and copy the full text. The text quality is crisp and clear throughout, making it easy to read. Diagrams and illustrations are raster images, but they are generally sharp and their labels are readable. Pages are clean with no noticeable scan artifacts or skew. Please note that pages 3 and 42 are intentionally left blank as filler pages.
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