JCB 426, 436, 446 Wheeled Loading Shovel Service Manual PDF

Description

JCB 426, 436, 446 Wheeled Loading Shovel Service Manual – Publication 9803/4160-15

This JCB 426, 436, 446 Wheeled Loading Shovel Service Manual is the complete workshop publication issued by JCB Technical Publications for the 426, 436 and 446 wheeled loading shovels. Running to 1095 pages, the JCB 426 436 446 service manual covers the whole machine – Perkins and Cummins engines, ZF powershift transmission, drive axles, brake system, Rexroth hydraulic pumps and loader valve block, electrical system, hydraulic steering and bodywork – with the dismantling, overhaul, pressure testing and adjustment procedures a service engineer needs at the bench.

File Details

• Manual type: Service / Workshop Manual
• Brand: JCB
• Models covered: 426, 436, 446 Wheeled Loading Shovels
• Publication number: 9803/4160-15
• Publisher: JCB Technical Publications, JCB Service
• Language: English
• Page count: 1095 pages
• File format: PDF

Chapters Covered in This JCB Wheeled Loader Service Manual

• Section 1 – General Information: introduction, identifying your machine, identification plates, VIN explanation, unit identification, torque settings for zinc plated, UNF Grade S, metric grade 8.8 and rivet nut fasteners, service tools by section, sealing and retaining compounds
• Section 2 – Care and Safety: safety notices, safety check list, general safety, operating safety, maintenance safety, safety decals
• Section 3 – Routine Maintenance: service requirements, service schedules, lubricants and capacities, cleaning, checking for damage, ROPS/FOPS checks, articulation lock, loader arm safety strut, greasing, automatic greasing system, access panels, heating and ventilation, electrical system, engine, fuel system, hydraulic system, transmission, wheels and tyres, window washers
• Section A – Attachments: quick release couplings, connecting and disconnecting flat face couplings, do’s and don’ts
• Section B – Body and Framework: air conditioning option, basic operation, R134a refrigerant, system control, fault finding, service procedures, rivet nuts, refrigerant charging and discharging, pressure switches, early and later type air conditioning units, cab glazing and direct glazing, ROPS/FOPS structure, rear bodywork removal and replacement, centre pivot removal and replacement, cooling pack removal, dismantling and assembly
• Section C – Electrics: general electrical data, light bulbs, fuses and relays by serial range, using a multimeter, battery maintenance and testing, specific gravity testing, alternator charging tests, starter motor starting circuit tests, HC11 and C164 EMS display panels, warning lights, automatic engine shutdown, 24-12 volt power distribution board, fault finding techniques, harness routing, wire tracing, component testing, schematic circuits, harness and wire number identification, connector locations, harness drawings, EMS software tools, alternator and starter motor overhaul
• Section E – Hydraulics: technical data by serial range, general description, hydraulic schematic symbols, circuit diagrams, pump operation, pump pressure/flow regulator valves, start up valve, loader valve operation for arms raise/lower, shovel float, shovel tip and crowd on 4-ram and Z-bar loaders, compensator spool operation, auxiliary services, servo pressure regulating valve, Automatic Carry Control System (ACCS), electronic emergency steering, hydraulic fault finding, hydraulic contamination, venting the hydraulic pressure, connecting and disconnecting hoses, positional type hydraulic adaptors, flow and pressure tests, idle control setting, hydraulic cooling fan setting, reversing fan software, pump removal and overhaul, emergency steering pump, cooling fan motors, ram dismantling and assembly, JCB ram sealing procedure, Z rams and 436ZX ram procedures
• Section F – Transmission: technical data for 426 and 436, drive axle ratios, tyre sizes and pressures, transmission gear ratios, stall testing, WG150 and WG200 powershift transmission control valve, charge pump, coaxial and lateral power take-off, layshaft, final drive, multi-disc clutches K4/K3, KR/K2 and KV/K1, emergency steering pump, WG160 and WG190 main components, oil circulation, power flow for forward and reverse speeds, test points, electro-hydraulic shift control, dismantling and assembly, hydraulic control unit, functional testing, transmission fault finding, fault codes for 4WG-160/190/210, propshafts, front and rear axle removal, heavy duty rear axle, hub and driveshaft, drive head, pinion depth, crown wheel and pinion adjustment, limited slip differential unit
• Section G – Brakes: technical data for 426/436 and 446, brake circuits by serial range, service brake system testing, brake pressure setting, bleeding the system, system accumulators, parking brake Type 1 and Type 2 adjustment, pad renewal and cable slack, park brake testing for pre-Smoothshift and Smoothshift machines, foot valve removal, dismantling and assembly
• Section H – Hydraulic Steering: general data, steering valve operation, hydraulic steering unit dismantling and assembly, emergency steering pump
• Section K – Engine: technical data for 426, 436, 446, 426B, 436B, 426 from serial 532500, 436 from serial 534200, 426e from serial 1295000 and 436e from serial 1410000

Between them these sections give a technician the complete working reference for the JCB 426, 436 and 446 loader. The routine maintenance section alone covers the full service schedule by hour interval with fluid capacities, while the alphabetically coded sections that follow take each assembly down to component level – the sort of material that turns a repair job from guesswork into a measured, spec-driven procedure.

Machine Coverage and Serial Numbers

The JCB wheeled loading shovel service manual covers three machines in detail, and the information for the 436 also applies to the 446 except where the text states otherwise:

• JCB 426 Wheeled Loading Shovel – from machine serial number 531001
• JCB 436 Wheeled Loading Shovel – from machine serial number 533001
• JCB 446 Wheeled Loading Shovel – from machine serial number 540000 to 540011

Later serial ranges are also addressed throughout the manual where procedures, pressures or components changed – for example the 426 from serial number 532100 and 436 from serial number 533692, the 426 from 532500 and 436 from 534200, the 426 from 532847 and 436 from 534469, the 426 from M1231500 and 436 from M1305000, and the 426 from M1295000 with 436 from M1410000. Where a different cooling pack, brake valve, transmission or engine management system applies to a later machine, the JCB service manual splits the procedure by serial number so you work from the right data.

Engines and Drivelines Referenced

Engine technical data is given for the Perkins 1006-6T7 in the 426 and the Perkins 1006-6T4 in the 436, both six-cylinder in-line units of 6.0 litres with a 100 mm bore and 127 mm stroke, plus the Cummins 6CT 8.3-170 six-cylinder turbocharged unit used in the 446. Later Tier 2 machines are documented with the BTAA 5.9-C engine and Bosch VE injection pump, and the Tier 3 426e and 436e with the QSB6.7 common rail engine. On the transmission side the manual covers the ZF WG150, WG200, WG160 and WG190 powershift units with torque converter diameters, stall multiplication ratios and gear ratios for forward and reverse, together with the electro-hydraulic shift control, clutch pack calibration and the full fault code list for the 4WG-160/190/210 range.

Hydraulics, Brakes and Electrics in Detail

The hydraulics section of this JCB 426 436 446 workshop manual is unusually thorough. It lists relief valve operating pressures for the lift ram head side, shovel ram head and rod sides, servo, brake and steering circuits, then walks through the Rexroth tandem pump, the start up valve, the MP-22 loader valve block and the compensator spool. Flow and pressure test procedures are given with the exact test points for main pump standby pressure, system control pressure and servo pressure on both 426 and 436/446 machines. Ram servicing is covered down to seal fitting technique, including the JCB ram sealing procedure and the 436ZX shovel ram with its torque figures and punch-marking requirements.

The braking chapter documents the oil-immersed multi-plate disc system with dual circuit full hydraulic actuation, pressure regulator cut-in and cut-out pressures, accumulator pre-charge pressures and the remote test point procedure for checking stored accumulator pressure. Parking brake adjustment, pad renewal and both Type 1 and Type 2 brake testing procedures are included for pre-Smoothshift and Smoothshift machines.

Electrics covers the 24 volt negative earth system, battery testing with specific gravity tables, alternator charging circuit tests, starter motor starting circuit voltage drop tests, and the HC11 and C164 Electronic Monitoring System display panels with their warning lights, start inhibit logic and automatic engine shutdown. Full schematic circuits, harness drawings, connector location tables and wire numbering rules are provided so a fault can be traced from source to destination rather than swapped at random.

What You Can Do With This Manual

With the JCB 426, 436, 446 Wheeled Loading Shovel Service Manual on hand you can carry out a full service to the hour-based schedule, diagnose a transmission fault from the ZF fault code list, set main pump and secondary pump pressures on a tandem pump machine, adjust loader valve auxiliary relief valves on a hand pump test block, rebuild a WG150 or WG160 clutch pack to the correct plate clearance, set pinion depth and crown wheel backlash on a PR10 or PR12 axle, charge an ACCS or brake accumulator with nitrogen, bleed the brake system, calibrate the clutch packs, and overhaul the hydraulic steering unit. Torque settings, clearances, adjustment values and test point locations are given throughout, which matters when a wrong figure can mean a repeat strip-down or a damaged component.

The manual is delivered as an instant PDF download – no shipping, no waiting, no physical book to lose in the workshop. Read it on a laptop, tablet or phone, print the pages you need for the job, and keep the full document on file for the next machine.