JCB ServiceMaster Archives - Auto Machine Diagnosis EPC Download Installation Service

Posted on September 4, 2025August 15, 2025 by autoepccatalog

JCB 3CX 4CX Boom Lock Cable Remove and Replacement Guide

This instruction show you guide on how to remove and replace boom lock cable for JCB 3CX 4CX backhoe loader.

The boom lock control A and associated cable is housed in the R.H. side console as shown.

Note the routing of the existing cable and route the new cable in the same way.

Preparations:
2025 JCB ServiceMaster 4 v25.1.0

2017 JCB Parts Plus+ and Repair Service Manual

JCB Electronic Service Tool

Removal

1 Park the machine on firm level ground, apply the parking brake. Lower the loader arms and excavator to the ground, switch OFF the engine and remove the starter key.

2 Working at the boom, remove the cable ball stud B from the boom lock casting.

3 Loosen the lock nut and disconnect the bulkhead fitting C from the bracket. Feed the end of the cable back underneath the cab to the rear wheel arch on the R.H. side of the machine and release the cable from the clamp assembly at position X as shown. Remove the spring clip D from the outer sleeve.

4 Working in the cab, unscrew the knob and lock nut from the boom lock control A. Remove the fixings from the side console panel and carefully lift up the rear corner of the side console panel over the boom lock control outer sleeve.

5 With the rear corner of the side console panel lifted up,carefully pull the boom lock cable up into the cab through the aperture in the cab floor.

Replacement

Replacement is the reverse of the removal sequence.

1 After fitting the cable, with the control knob pressed down adjust the bulkhead fitting C to take up any slack in the cable. The cable should be tight but must not lift the boom lock from its fully down position.

2 Operate the boom and check that the boom lock will engage and disengage correctly using the control knob in the cab. Check the boom stop setting, see Boom Stop Setting.

Posted on June 12, 2025June 23, 2025 by autoepccatalog

JCB 140 205 Excavator C0393-13 Swing Lock Solenoid Open Circuit Solution

This instruction show you guide on how to solve JCB 140 205 excavator C0393-13 swing lock solenoid open circuit error.

Preparations:
2025 JCB ServiceMaster 4 v25.1.0

2017 JCB Parts Plus+ and Repair Service Manual

JCB Diagnostic Kit

Possible Cause:

1 Swing solenoid not connected to machine wire harness.

2 Faulty Solenoid.

3 Terminal back out on the MECU wire harness connector.

Diagnosis:

1 Check the wire harness connection on swing solenoid. Refer below photograph.

2 Check the solenoid coil circuit resistance. The resistance of solenoid coil shall be 37Ω.

3 Check the circuit no 8049 on cavity no 56 & circuit no 4049 on cavity no 25 in the MECU wire harness connector in CAB base harness for terminal back out. Refer the below photograph.

Posted on March 15, 2025March 5, 2025 by autoepccatalog

JCB excavator 140 205 C1024-13 Hydraulic Temperature Sensor Open Circuit

This instruction show you guide on how to solve JCB excavator 140 205 DTC C1024-13 hydraulic temperature sensor open circuit.

Preparations:
2025 JCB ServiceMaster 4 v25.1.0

2017 JCB Parts Plus+ and Repair Service Manual

JCB Diagnostic Kit

Possible Cause:

1 Hydraulic oil temperature sensor not connected with the hydraulic oil temperature sensor.

2 Faulty Wire harness.

3 Faulty Hydraulic oil sensor.

Diagnosis:

1 Check wire harness connection with hydraulic oil temperature sensor. Refer below photograph.

2 Check the wire harness connector for terminal back out connecting to hydraulic oil temperature sensor.

3 Check the MECU wire harness connector cavity 3 for 4303D circuit & cavity no 18 for circuit no 4003 for terminal back out.

4 Check the open circuit resistance of hydraulic oil temperature sensor by help of multimeter. The open circuit resistance shall meet the below resistance vs temperature table.

Corrective Action:

1 Replace the faulty wire harness.

2 Correct the terminal back out if any at temperature sensor or MECU END.

3 Replace the faulty temperature sensor.

Posted on July 19, 2023 by autoepccatalog

How to Use JCB ServiceMaster 4 Flashloader Tool

The Flashloader software tool is part of the JCB Servicemaster software suite.If the ECU is replaced and the data file in its flash memory is not applicable it will be necessary to `flash’ the ECU memory with the correct data file. The Flashloader software tool can be used to access the data file name
currently loaded in the ECU memory and is necessary up load a new data file ito the ECU.

Related Contents:
Newest JCB ServiceMaster 4 Diagnostic Software

JCB Machine EPC+Service Manual 2017
JCB KG V2 to Unlock Function

Connecting Flash Loader
To use Flash Loader your laptop computer must be connected to the machine CANbus.

Starting Flashloader
1 Turn ON the machine ignition but DO NOT start the engine.
2 Start JCB Servicemaster on the laptop computer.

3 Make sure that the correct DLA is selected in the chooser. Click on `Utilities’, DLA Setup. The DLA
Chooser window opens. Check the button to match to the Current Device. Click `Apply’

4 Select the required machine range

5 The Flashloader tool will then open.

Using Flash Loader
Important: Do not turn off the ignition or isolate the system by accidentally engaging the operators seat isolation switch when using the flash loader. This will interrupt the flash signal to the ECU and will irreparably damage the ECU.
1 Make sure that the machine ignition switch is set to`ON’ but do not start the engine.
2 Click on the ECU icon.
3 Click on the `Browse’ button and select the correct data file. Click `Open’.

4 Click on the `Start’ button. A confirmation window will appear. Click on the `Yes’ to start the reprogramming of the ECU. The progress bar is displayed.

5 When the programming is complete switch the machine ignition to the `OFF’ position.
Important: Re-flashing the engine ECU changes the base programme. Re-flashing the ECU does not configure the machine settings such as fuel injector calibration codes,and other machine specific options.
6 Before starting the engine make sure that the machine setup data is correct. You must check that all other relevant machine settings are correctly configured. Use the setup software tool.

Posted on June 27, 2023June 27, 2023 by autoepccatalog

JCB Network Systems Knowledge Instruction

What is the Network System?
Modern machines use electronic control units (ECUs) to control machine systems such as hydraulics, transmission and engine.
In much the same way as office computers can be networked’ to communicate with each other so the machine ECUs can be `networked’.

JCB ServiceMaster 4

Some advantages of networking are:
– Improved more intelligent control systems
– More comprehensive and reliable in-cab instrumentation
– Service software tools can be used for fault finding and machine control set up.
The engine ECU can communicate with other machine ECUs using a CANbus network system.

CANbus Communications System
An electronic communications system that connects all the machine ECUs to one pair of data wires called the CANbus. Coded data is sent to and from the ECUs on the
CANbus.
By connecting Servicemaster diagnostic software to the CANbus, data is seen and decoded for use by a service engineer.

Posted on May 31, 2023 by autoepccatalog

How to Install DLA Deriver for JCB ServiceMaster 4

To use Servicemaster for the first time you must load the DLA driver software. You will not have to do the procedure again.

Related Contents:

JCB ServiceMaster 4 v23.4.2 Download & Installation Service

Important: DO NOT connect the DLA or cables at the laptop or machine now

1 Start the Servicemaster software on your laptop computer.
2 Click the ‘Other’ tab.
3 Click on the ‘General’ icon.
4 Click on the ‘DLA’ icon.

5 Double click on the USB driver icon.

Note: Drivers are also available for computers with serial ports (no USB) and other versions of Microsoft Windows. If your laptop does not have a USB port, double click on the correct driver icon.
6 The driver installer window will open. Follow the onscreen installation instructions to complete the installation.