Part of the JCB Repair Manuals.
This is JCB Service Manual publication 9803-4160-17 for the 426, 435, 436 and 446 wheeled loading shovels. It covers the loader valve, WG powershift transmissions, axles, brakes, steering and the Perkins and Cummins engines.
Many figures change by model and serial range, so check your plate against the identification section first. The 435 is only covered by the 435S Tier 4 electrical schematics.
What's Inside This JCB 426, 435, 436, 446 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 1-43 | Model and Serial Numbers, VIN and PIN Identification, Engine Plate, Standard Torque Settings, Service Tools, Service Consumables, Hydraulic Schematic Colour Coding |
| Care and Safety | 44-63 | Important Information, Safety Check List, Safety Labels |
| Routine Maintenance | 64-183 | Service Requirements, Service Schedules, Fluids, Lubricants and Capacities, Greasing, Brakes, Engine, Fuel and Hydraulic System Checks, Transmission, Tyres and Wheel Nut Torques |
| Attachments | 184-197 | Connecting and Disconnecting Hydraulic Hoses, Quickhitch, Quickhitch Ram and Locking Valve |
| Air Conditioning | 198-267 | Air Conditioning Technical Data, Basic Operation, Air Conditioning Fault Finding, Rivet Nuts, Service Procedures for Early and Later Type Systems |
| Body and Framework | 268-343 | Cooling Pack, Hydraulic Cooling Fan, Centre Pivot, Cab, Belly Plates, Rear Bodywork, Seat, Battery, Heater and Air Conditioning Controls |
| Electrics | 344-451 | General Electrical Data, Fuses and Relays, Electrical Fault Finding, EMS Tier 3 and Tier 4, Multimeter Use, Battery, Alternator, Starter Motor, Wire Numbers, Harness Repair |
| Electrical Schematic Circuits | 452-587 | Electrical Schematics by Serial Range: 426 and 436 From March 98, 446 From March 98, 426 From 532100 and 1295000, 435S Tier 4, Cummins QSB and QSL T4i |
| Harness and Connector Identification | 588-728 | Connector Location and Identification, Harness Drawings and Wire Number Identification by Machine Series |
| Alternator, Starter and Controllers | 729-751 | Alternator Overhaul, Starter Motor for 426, 436 and 446, Transmission Control Unit, Ems, Livelink |
| Hydraulic Data and Schematics | 752-828 | Hydraulic Technical Data by Serial Range, General Description, Hydraulic Schematic Symbols, Hydraulic Schematic Circuits |
| Hydraulic Circuit Descriptions | 829-866 | Pump Operation, Loader Valve, Auxiliary Services, Servo Pressure Regulating Valve, Smooth Ride System, Electronic Emergency Steering, Test Port Diagrams, Parker Valve |
| Hydraulic Fault Finding and Tests | 867-918 | Hydraulic Fault Finding, Contamination, Releasing Pressure, Flow and Pressure Tests, Idle Control, Cooling Fan Setting, Emergency Steering, Smooth Ride System, Cooling Fan Motor |
| Pumps, Rams and Valves | 919-988 | Hydraulic Pumps, Hydraulic Rams, Smooth Ride System Components, Servo Control Lever and Valve, Loader Valve, Hot Test Settings |
| Powershift Transmission WG 150 and WG 200 | 989-1028 | Transmission Technical Data for 426 and 436, WG 150 and WG 200 Powershift Transmission |
| Powershift Transmission WG 160 and WG 190 | 1029-1088 | Main Components, Oil Circulation Schematic, Clutches Actuated per Gear, Test Points and Measuring Devices, Calibration Procedure, Hydraulic Pump, Dismantling and Assembly |
| Axles | 1089-1206 | Front and Rear Axle, Hubs, Drive Head, Crown Wheel and Pinion, Limited Slip Differential, Driveshafts, ZF Mt-L Axles |
| Transmission Testing and Error Codes | 1207-1274 | Transmission Functional Testing, Transmission Fault Finding, ZF 4WG Error Codes, Controller Pin Data, Transmission Removal, EMS Display, Wheel Exchange |
| Brakes | 1275-1314 | Brake Technical Data, Brake System Circuits, Service Brakes, Park Brake Testing, Cable and Caliper, Accumulators, Foot Brake Valve |
| Hydraulic Steering | 1315-1342 | Steering Technical Data, Steering Operation, Steering Unit, Emergency Steering, Steering Column, Steering Ram and Valve |
| Engine | 1343-1366 | Engine Technical Data by Series (Perkins 1006, Cummins 6CT, Btaa 5.9, Qsb 6.7), Cummins Engine and Transmission Removal and Installation, Engine Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Engine, 426 / 436 (early) | Perkins 1006-6T7 / Perkins 1006-6T4 | p. 1347 |
| Engine power, 426 / 436 (early) | 93kW +/-5% @ 2200 rev/min / 122kW +/-5% @ 2200 rev/min | p. 1347 |
| Idling speed, 426 / 436 (early) | 780 - 820 rev/min | p. 1347 |
| Engine, 446 | Cummins C Series 6CT 8.3 - 170, 170 hp @ 2200 rpm governed speed | p. 1348 |
| Gross power, 426 from 532500 (Tier 2 engine) | 150 hp (112 Kw) at 2200 rev/min | p. 1350 |
| Max. net torque, 426 from 532500 (Tier 2) | 630 Nm (465 lbf ft) at 1500 rev/min | p. 1350 |
| Gross power, 436 from 534200 (Tier 2) | 173 hp (129 Kw) at 2200 rev/min | p. 1351 |
| Engine oil, 426 from 532500 | 14 litres (3.1 UK gal) JCB Extreme Performance Engine Oil 15W/40 | p. 86 |
| Hydraulic system, 426 from 532500 | 210 litres (46.2 UK gal) JCB HP Hydraulic Fluid ISO VG46 | p. 86 |
| Cooling system, 426 from 532500 | 35 litres (7.7 UK gal) Water/Anti-freeze | p. 86 |
| Fuel system, 426 from 532500 | 230 litres (50.6 UK gal) Diesel | p. 86 |
| Engine oil, 436 from 533692 | 16 litres (3.5 UK gal) | p. 87 |
| Gearbox, 436 from 533692 | 34 litres (7.5 UK gal) JCB HP Universal ATF | p. 87 |
| System control pressure (main pump relief valve), 436 and 446, bar / kgf/cm2 / lbf/in2 | 245 - 255 / 250 - 260 / 3552 - 3697 | p. 761 |
| Primary pump full flow at 2200 rev/min, 436 and 446 | 156 litres/min 34.3 UK gal/min 41.2 US gal/min | p. 761 |
| Steer relief pressure (at ram), 436 and 446, bar / kgf/cm2 / lbf/in2 | 175 / 178.5 / 2537.5 | p. 762 |
| Hydraulic tank, 446, litres / UK gal / US gal | 173 / 38.0 / 45.8 | p. 764 |
| Brake accumulator pre-charge, 426 from 1231500 and 436 from 1305000, bar / PSI | 57 +/- 1 / 825 + 30 - 15 | p. 773 |
| Brake cut-out pressure | 200 bar 2900 lbf/in2 | p. 1280 |
| Service brake operating pressure | 80 bar 1160 lbf/in2 | p. 1280 |
| Transmission, 426 / 436 / 446 | WG-150 / WG-200 / WG-200 | p. 995 |
| Overall axle ratio, 426 / 436 | 20.197:1 / 21.098:1 | p. 993 |
| Wheel nut torque, front / rear, Nm / lbf ft | 600 / 443, 600 / 443 | p. 181 |
