Looking for the factory tear-down steps for your excavator? This 558-page JCB JZ140 service manual PDF (OEM #9803/9910-3) covers the excavator with exact repair procedures. Open it up to find complete electrical schematics for the A.M.S. system, full hydraulic flow charts covering everything from the main control valve to the slew motor, and detailed diagnostic error code tables. You also get a massive maintenance section detailing routine fluid changes, track tension adjustments, and heavy component rebuilds. Secure the track guard mounting bolts to exactly 290 Nm, and lock down the plexus filter bolts at 20 Nm to prevent pressure leaks. Stop waiting on dealers for simple answers. Download this bookmarked file straight to your tablet, find your spec, and get your machine digging again.
What's Inside This JCB JZ140, JZ140HD, JZ235, JZ255 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 1-47 | Introduction, Identifying Your Machine, Torque Settings, Hydraulic Connections, Service Tools, Tool Detail Reference, Service Consumables, Terms and Definitions |
| Care & Safety | 48-67 | Safety Notices (Important Information, Operator Manual, Safety Warnings), Safety Check List (Safety - Yours and Others, Operating Safety, Maintenance Safety) |
| Routine Maintenance | 68-167 | Service Requirements, Health and Safety, Service Schedules, Fluids, Lubricants and Capacities, Tools, Prepare the Machine for Maintenance, Cleaning the Machine |
| Body & Framework | 168-211 | Technical Data (Static Dimensions, Dig Depth Chart, Shipping Weight, Air Conditioning), Basic Operation (Automatic Temperature Control System), Fault Finding (Air Conditioning) |
| Electrics | 212-311 | Basic System Operation (Circuit Symbols, Component Identification, Schematic Diagram, A.M.S, Circuit Concepts, Pulse Width Modulation, ECU1/EMS/FACIA Power Supply and Network, ECU 1 Supply to Output Drivers, Engine Throttle Control, Pump Control for Each Mode, Hardware Sensing, Auto Boost Pressure, Engine Oil Level Warning, Engine Pre Heat, Engine Automatic Warm Up, Engine Automatic Idle, Engine One Touch Idle, Engine Start/Stop, Limp Mode System, Lever Lock, Servo Isolator, Wiper, Lower Wiper, Washer, Horn, Travel Alarm, Soft/Hard, Slew Brake, Slew Lock, Slew Brake Solenoid Valve Failure, 3-Speed Travel, Work Lamps, Hydraulic Fan, Fuel Level Sensor/Warning, Engine Temperature Sensor/Warning, Coolant Level Warning, Air Filter Blocked Warning, Hydraulic Temperature Sensor/Warning, Alternator/No Charge Warning, Quick Hitch, Overload Caution, Beacon, Hammer Only, Scrap Magnet Option, Cab Interior Lamp, Refuelling Pump, Air Conditioning, Heated Seat, Radio and Cigar Lighter, Service Required Warning, Ems Set Menu, Ems Set + Mode Menu, Ems Set+Mode Menu) |
| Hydraulics | 312-411 | Technical Data, Basic System Operation (Hydraulic Component Location, Introduction to Hydraulic Schematic Symbols) |
| Transmission | 412-470 | Technical Data (Travel Equipment), Fault Finding (Transmission), Traction Motor / Reduction Gear (Description, Operation, Removal and Replacement, Start Up and Running in) |
| Track & Running Gear | 471-505 | Idler Wheel and Recoil Unit (Removal, Replacement), Idler Wheel (Dismantling, Assembly), Recoil Unit (Dismantling and Assembly) |
| Engine | 506-558 | Technical Data |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| JZ140, JZ235, JZ255 | ||
| Track Guard Mounting Bolts Tightening Torque | 290 Nm (213 lbf ft) | p. 114 |
| All Models | ||
| Pilot Oil Filter Bowl Tightening Torque | 24.4 to 34.3 Nm (18.07 to 25.5 lbf ft) | p. 149 |
| Plexus Filter Bolts Tightening Torque | 20 Nm (14.75 lbf ft) | p. 147 |
| Fuel Pump Filter Element Replacement Interval | Change (see service schedules) | p. 79 |
| Primary Fuel Filter/Sedimenter Replacement Interval | Change (see service schedules) | p. 79 |
| BSP Adaptors 1/4 inch Torque Setting | 18.0 Nm (1.8 kgf m, 13.0 lbf ft) | p. 16 |
| BSP Adaptors 3/8 inch Torque Setting | 31.0 Nm (3.2 kgf m, 23.0 lbf ft) | p. 16 |
| JZ140 | ||
| Boom Ram Piston Nut Torque | 2430 Nm (1798 lbf ft) | p. 321 |
| TAB (Lift) Ram Piston Nut Torque | 2430 Nm (1792 lbf ft) | p. 321 |
| Engine Oil Capacity | 11.6 litres | p. 87 |
| Hydraulic System Capacity | 124 litres | p. 87 |
| JZ235, JZ255 | ||
| Engine Oil Capacity | 21.5 litres | p. 88 |
JCB JZ140, JZ140HD, JZ235, JZ255 Common Problems This Manual Covers
JCB JZ140 hydraulic functions become slow, weak, or erratic after the machine warms up p. 87
Inspect the hydraulic fluid condition and verify the system holds the correct 124 litres of oil as noted on page 87. Drain the fluid and replace the Plexus filter element every 200 hrs if using a breaker. Torque the Plexus filter bolts to 20 Nm (14.75 lbf ft) during installation.
Manual Section: Routine MaintenanceMachine will not start, cranks poorly, or starts intermittently in cold weather p. 510
Measure the engine valve clearance on cold engines as shown on page 510 to ensure proper starting. Set the inlet valves to exactly 0.40 mm. Replace the primary fuel filter element and tighten the sedimenter bowl using a filter wrench to eliminate air leaks in the fuel system.
Manual Section: EngineTravel drive is weak, one side does not track properly, or the machine pulls p. 114
Inspect the undercarriage components for excessive wear or binding. Check the track guard mounting bolts on page 114 and torque them to 290 Nm (213 lbf ft) to prevent track misalignment. Test the travel motor pressures and verify the drive sprocket is entirely free of built-up debris.
Manual Section: Transmission Fault FindingBoom, arm, or bucket drift, poor holding power, or unexpected drop under load p. 321
Remove and inspect the boom cylinder seals for bypass leakage. When rebuilding the boom ram, check page 321 and torque the piston nut to exactly 2430 Nm (1798 lbf ft) during reassembly. Replace all hydraulic hoses every 2 years or 4000 hours to maintain total system integrity.
Manual Section: HydraulicsFrequently Asked Questions
How do I reset the JCB JZ140 fault code?
For Automatic Temperature Control (ATC) system error codes, a battery reset may be required to remove the error after repair. This is a general recommendation for ATC system faults.
How do I reset the JCB JZ140 hydraulic pressure alarm?
The audible warning for the hydraulic temperature sensor/warning can be cancelled by pressing the "ACK" button on the EMS. This action specifically addresses the alarm, not a general fault code reset for the hydraulic system.
What does the JCB JZ140 error code mean?
The manual provides tables listing various error codes for both the engine and air conditioning systems. For example, engine error code P0087 means "Fuel rail pressure is too low (Fuel leak)" and indicates "Actual rail pressure < Minimum target rail pressure at actual rail pressure is 15MPa or more", resulting in a "LOW POWER" message.
How do I reset the JCB JZ140 monitor?
For Automatic Temperature Control (ATC) system error codes, a battery reset may be required to remove the error after repair. Additionally, for a "LIMP HOME" message, the buzzer can be cancelled by pressing the ACK button on the EMS.
Is this Service Manual a digital download?
This is a 558-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Are there any print restrictions on this manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Are hydraulic system diagrams in this JCB JZ140 Service Manual?
Yes, this JCB JZ140 Service Manual includes hydraulic system diagrams, circuit schematics, and component specifications.
Document Quality
This is a high-quality digital PDF document, allowing you to search and copy the full text content. All text is crisp and clear, ensuring easy readability throughout the manual. Diagrams and illustrations are sharp, with clearly legible labels, whether they are detailed line drawings or raster images of the machine. The pages are consistently clean, free from scan artifacts, stains, or skewed elements. Please note that several pages are intentionally left blank, as indicated within the document.
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