Part of the JCB Repair Manuals.
Looking for the factory tear-down steps for your JCB Loadall? This 587-page JCB 504b, 526, loadall service manual pdf (OEM #9803/3610U-4) delivers exactly how to rebuild the transmission, service the hydraulics, and fix the electrical system. Inside, you get a massive section of hydraulic schematics, full wiring diagrams with relay identification, and complete fault-finding charts for the powertrain. Open up to step-by-step procedures covering everything from the compensating master cylinder to the SS640 transmission torque figures. Set your hydraulic filter relief valve to exactly 1.05 bar and confirm the 8-stud wheel nuts are tightened down to 325 Nm before sending the machine back out. Guessing at fluid pressures burns up pumps and your profit margin. Download this bookmarked file straight to your tablet, click on the exact system you are working on, and get the job done right.
What's Inside This JCB 504B, 526, LOADALL Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 1-28 | Identification Plate, Torque Settings, Service Tools, Sealing and Retaining Compounds |
| Care & Safety | 29-36 | Safety Notices, General Safety, Operating Safety, Maintenance Safety, Lubricants - Health and Safety |
| Routine Maintenance | 37-79 | Lubricants and Capacities, Machine Safety, Service Schedules, Grease Every 50 Hours, Grease Every 500 Hours, Oiling, Tires and Wheels, Foot Brake |
| Attachments | 80 | |
| Body & Framework | 81-110 | Cab - Removal and Replacement, Direct Glazing, Fuel/Hydraulic Tank, Wear Pads, Inner and Outer, Air Conditioning Option, Rivet Nuts |
| Electrics | 111-203 | Technical Data, Relay Identification, Fuse Identification, Test Methods, Proximity Switch, Schematics, Wire/harness Numbers - Explanation of, Wire Number Indentification |
| Controls | 204-205 | Adjusting |
| Hydraulics | 206-267 | Technical Data, 504B Rs Machines and 504B 4 Wheel Steer Machines Up to Serial No. 278610, 526 Machines From Serial No. 280300 with Dual Lever Control |
| Assembly | 272-326 | Descriptions, Technical Data, Towing Procedure, Testing, Fault Finding, Torque Converter, Dismantling, SS640 Section Views and Torque Figures |
| PS750 Section Views and Torque Figures | 327-360 | PS700 Section Views and Torque Figures, Reverser Unit (Later Type) - Dismantling, Reverser Unit (Earlier Type), Reverser Unit (Later Type) - Assembly, Mechanical 4 Wheel Drive Unit - Assembly, Mechanical 4 Wheel Drive Unit - Dismantling, Powershift (with Reverser Shaft Cover Plate) |
| Powershift (with Reverser Shaft Sealing Plug & PS750) | 361-382 | |
| Layshaft - Dismantling | 383-407 | Input Clutch & Reverser Clutch - Assembly, Input Clutch and Reverser Clutch - Input Clutch, Input Clutch and Reverser Clutch - Dismantling, Mainshaft - Dismantling, Mainshaft - Location of Components, Mainshaft - Assembly, Layshaft - Location of Components |
| Hydraulic 2/4 Wheel Drive Unit | 408-428 | Ps 750 Input & Reverser Clutch - Assembly, Layshaft - Assembly, Ps 750 Input & Reverser Clutch - Dismantling, Powershift PS750, Ps 750 Mainshaft - Assembly, Ps 750 Mainshaft - Dismantling, Ps 750 Layshaft - Assembly, Ps 750 Layshaft - Dismantling |
| Differential | 429-454 | Propshafts, Polytetrafluoroethene (Ptfe) Piston Ring Seals - Fitting Procedure, Permanent 4 Wheel Drive Unit, Solenoid Valve, Output Shaft Removal - Larger Diameter Gears, Collapsible Spacer - Assembly, Rear Hub - Unbraked, Rear Axle |
| Drop Box | 455-502 | Drive Head, Hub and Driveshaft - Dismantling, Pinion, Hub and Driveshaft - Assembly, Hub, Drive Head with Limited Slip Differential, Crown Wheel and Pinion, Brakes |
| Axle Operating Temperature (Oil Immersed Brakes) | 503-507 | Transmission Oil Cooling, 2/4 Wheel Disconnect (If Fitted) |
| Brakes | 508-539 | Technical Data, Compensating Master Cylinder, Power Brake Circuit, Testing the Parking Brake, Parking Brake Adjustment, Brake Discs, Fault Finding, Bleeding |
| Steering | 540-577 | Technical Data, Steer Valve Operation, Priority Valve Operation, Steer System Operation, Fault Finding, Re-Aligning the Road Wheels, Powered Track Rod, Link Arms |
| Engine | 578-587 | Identification, Torque Settings, Service Tools (Numerical List, Section B, Section C, Section E, Section F, Section H, Section K), Sealing and Retaining Compounds |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Wheel nut torque (8 stud wheels) | 325 Nm (240 lbf ft) | p. 57 |
| Wheel nut torque (5 stud wheels) | 680 Nm (500 lbf ft) | p. 57 |
| Fuel filter element tightening | hand tight only | p. 68 |
| Engine oil filter canister tightening | hand tight only | p. 61 |
| Diverter valve adaptors torque | 100-120 Nm (73.75 - 88.5 lbf ft) | p. 256 |
| Ram end cap torque | 678 Nm (500 lbf ft) | p. 267 |
| Relay specifications | Not found (only identification and general instructions to fit correct type) | p. 113 |
| Solenoid valve knurled nut torque | 10 to 15 Nm (1 to 1.5 kgf m, 8 to 10 lbf ft) | p. 431 |
| 504B & 526 Machines | ||
| Hydraulic filter filtration size | 0.001 in (25 microns) | p. 208 |
| Hydraulic filter relief valve setting | 15 lbf/in² (1.05 bar) | p. 208 |
| 504B From Machine Serial Number 277001 to 279014 | ||
| Fuse rating (Starter relay) | 1 | p. 116 |
| Fuse rating (Heater) | 15 | p. 116 |
