Need the exact tear-down steps for your JCB Wheeled Loading Shovel? This 747-page JCB 435S service manual PDF (OEM #9803/9420-3) also covers the 434S variant, detailing every factory procedure from the engine to the axles. Inside, you get complete wiring diagrams for Tier 4 systems, detailed hydraulic schematics covering both Rexroth and Parker valve setups, and a comprehensive troubleshooting guide for the powershift transmission. Open to the brakes section for full flow charts and step-by-step rebuild procedures for the park brake and system accumulators. Verify the brake system low-pressure warning activates at exactly 105 bar, then confirm your tandem pump mounting bolts are fastened to 130 Nm. Stop throwing expensive parts at an unknown fault code. Grab this bookmarked digital reference, search for your spec, and get your loader back to work.
What's Inside This JCB 434S, 435S, Wheeled Loading Shovel 434S/435S, 435S Machines Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 1-45 | Introduction, Identifying Your Machine (434S, 435S), Torque Settings (Zinc Plated Fasteners and Dacromet Fasteners, Hydraulic Connections) |
| Care and Safety | 46-63 | Safety Notices (Safety Check List, Safety - Yours and Others, Operating Safety, Maintenance Safety) |
| Attachments | 64-71 | Optional Attachments, Connecting/Disconnecting Hydraulic Hoses |
| Body and Framework | 72-139 | Technical Data (Air Conditioning Option), Fault Finding (Air Conditioning), Service Procedures (Rivet Nuts, Air Conditioning), Air Conditioning (Components) |
| Electrics | 140-275 | Technical Data, Service Procedures (Using a Multimeter, Battery, Alternator, Starter Motor, Wire and Harness Number Identification, Wiring Harness Repair) |
| Hydraulics | 276-419 | Technical Data (Rexroth Valve Machines, Parker Valve Machines), Basic Operation (Introduction to Hydraulic Schematic Symbols) |
| Transmission | 420-675 | Technical Data (Transmission, Axles, Tyres), Axles (Front Axle, Rear Axle, Hub and Driveshaft, Drive Head, Crown Wheel and Pinion, Limited Slip Differential Unit, Zf Axles) |
| Brakes | 676-701 | Technical Data (Brakes), Brake Circuits (434S Machines, 435S Machines), Service Procedures (Service Brakes, System Accumulators, Park Brake, Park Brake Testing) |
| Hydraulic Steering | 702-723 | Technical Data, Circuit Descriptions (Steering Operations), Emergency Steering (System Description), Hydraulic Steering Unit (Dismantling and Assembly) |
| Engine | 724-747 | Technical Data (434S From Serial No. 124400, 435S), Troubleshooting (Possible Faults), Engine and Transmission (Removal and Installation), Sump Drain Plug (435S Machines) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Brake system low pressure warning activation | 105 bar | p. 680 |
| Tandem Pump mounting bolts torque | 130 Nm | p. 380 |
| Torque Converter Dia. | 300mm (11 in) | p. 424 |
| Hydraulic Control Unit pressure regulator socket head screws torque | 5.5 Nm | p. 605 |
| Hydraulic Steering Unit set screw torque | 11 Nm (8.1 lbf ft) | p. 713 |
| Hydraulic Steering Unit cap screws torque | 31 Nm (22.9 lbf ft) | p. 716 |
| 434S | ||
| Accumulator Capacity per circuit | 0.75 litre | p. 680 |
| Torque Multiplication at Stall | 3.01:1 | p. 424 |
| Hydraulic RV stall (arms fully lowered) | +0/-10 of flight | p. 417 |
| 435S | ||
| Accumulator Capacity per circuit | 1.75 litre | p. 680 |
| Hydraulic RV stall (arms fully lowered) | +0/-10 of flight | p. 419 |
| 434S Rexroth Valve Machines | ||
| Hydraulic tank capacity (Rexroth Valve Machines) | 181 Litres | p. 281 |
JCB 434S, 435S, Wheeled Loading Shovel 434S/435S, 435S Machines Common Problems This Manual Covers
JCB 434S low pressure warning light on dash and complete loss of service brakes p. 680
Test the accumulator pressure as outlined on page 680. Verify the low pressure warning activates at 105 bar. Check the accumulator gas pre-charge and confirm it measures exactly 57 bar. Replace the accumulator if pressure bleeds down quickly after engine shutdown.
Manual Section: BrakesSlipping gears under load or transmission oil overheating during heavy stockpile pushing
Check the transmission oil temperature and verify it remains within the operating range specified in the manual. Inspect the powershift transmission oil tube mounting bolts and torque them to the specification in the Transmission section. Read the error codes to diagnose internal clutch slippage.
Manual Section: Transmission Fault FindingBucket lift arms move slowly when fully loaded or pump makes whining noise p. 380
Inspect the tandem pump mounting hardware and torque the bolts to 130 Nm as shown on page 380. Check the hydraulic tank level and top off to the capacity specified in your valve configuration's technical data section. Clean the main suction strainer if flow remains restricted.
Manual Section: Hydraulic Fault FindingJoystick steering feels loose or erratic side-to-side drifting during high speed road travel p. 716
Remove the steering unit cover and inspect the internal fasteners. Torque the hydraulic steering unit cap screws to 31 Nm (22.9 lbf ft) as specified on page 716. Verify the set screw is tightened to 11 Nm (8.1 lbf ft) to prevent steering column play.
Manual Section: Hydraulic SteeringFrequently Asked Questions
How do I reset the transmission fault code on a JCB 435S?
The manual indicates that transmission fault codes on a JCB 435S are reset automatically once the underlying issue is resolved and the Transmission Control Unit (TCU) is powered up. For example, for a 'Logical Error for the Selected Gear Range' (FC 11, SPN 5000, FMI 12, IC 48), the fault is reset if the TCU senses a valid signal for that shift lever position after power-up.
What do the JCB 434S/435S error codes mean?
The JCB 434S/435S error codes are detailed in tables within the manual, providing their meaning, the reaction of the Transmission Control Unit (TCU), and repair procedures. For example, Table 22 on page 624 lists 'ZF Error Codes' for 4WG-160/190/210 transmissions, including Fault Code (FC), Serial Parameter Number (SPN), Failure Mode Indicator (FMI), and Internal Code (IC) with a description of the fault.
How do I clear a hydraulic warning on a JCB 435S?
The manual does not describe a specific procedure to 'clear' a hydraulic warning on a JCB 435S. Instead, it provides fault-finding tables that list possible causes and required actions to rectify the underlying hydraulic issues. Warnings are expected to clear once the identified fault, such as 'Insufficient hydraulic fluid' or 'Hydraulic leaks in system', is addressed and corrected as per the recommended actions on page 355.
What are the replacement specifications for brake accumulator?
Replacement specifications for brake accumulators vary by valve type. For Rexroth Valve Machines, the gas volume is 0.75 litres (45.8 cubic inches) with a pre-charge pressure of 57 +/- 1 bar (825 + 30 - 15 PSI). For Parker Valve Machines, the gas volume is 1.75 litres (106.7 cubic inches) with the same pre-charge pressure of 57 +/- 1 bar (825 + 30 - 15 PSI).
How will I receive my JCB 434S/435S Wheeled Loading Shovel service manual?
Immediate download of the complete 747-page searchable Service Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Are there any print restrictions on this manual?
There are no print restrictions. 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 434S/435S service manual include wiring diagrams?
Yes, full electrical schematics are included with wire colors, connector locations, and circuit descriptions.
Document Quality
This document is a scanned PDF with an OCR layer, allowing you to search and copy most of the text. The text quality is generally clear and readable, though some characters show minor pixelation from the OCR process. Diagrams and illustrations are rasterized line drawings, which remain readable but are not crisp when highly zoomed; labels within these images are clear. Many tables containing critical data, such as torque settings, fastener types, and technical specifications, are embedded as images and are not searchable or selectable. The pages are clean with no notable scan artifacts, stains, or skewed content. You will find several intentionally blank pages throughout the document.
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