Tag: JCB Trouble Repair

The following Procedure describes JCB 3CX, 4CX, 214e, 214, 215,217 & VARIANTS Backhoe Loader removal and replacement of a double section pump, follow the same procedure for single section pumps.

 

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Removal

! WARNING

Make the machine safe before getting beneath it. Ensure that any fitments on the machine are secure; engage the parking brake, remove the starter key, disconnect the battery.

1 Remove the propshaft, refer to Section F Propshafts -Removal and Replacement.

2 Drain the hydraulic fluid from the hydraulic tank.

3 Remove flange bolts B (4 off) and disconnect the pump inlet hose flange from the pump body. Blank off all exposed connections to prevent ingress of dirt.

4 Disconnect the pump outlet hoses C and D from the elbow fittings. Blank off all exposed connections to prevent ingress of dirt.

 

! CAUTION

The hydraulic pump is heavy. Do not attempt to remove the pump unless its weight is held by a sling. Make sure that the sling is attached to a suitable lifting appliance.

 

5 Secure the pump using a sling around the pump body,remove the pump mounting bolts E and carefully withdraw the pump clear of the gearbox.

 

Replacement

Replacement is the reverse of the removal procedure.

1 Clean off all traces of gasket compound from the pump and gearbox mounting faces. Apply a thin bead of JCB Multigasket to the gearbox mounting face.

 

2 Locate the splined shaft of the pump into the gearbox.

Apply JCB Threadlocker and Sealer to bolts E and secure the pump flange to the gearbox mounting face.

 

3 Reconnect the pump outlet hoses C and D to the elbow fittings.

Note: All hydraulic adapters that are installed together with a bonded sealing washer must also have sealant JCB Threadseal applied to the threads of the adapter.

4 Reconnect the pump inlet hose flange to the pump body with bolts B (4 off).

 

5 Fit the propshaft, refer to Section F Propshafts -Removal and Replacement.

 

6 Fill the system to the correct level with recommended hydraulic fluid, refer to Section 3 Fluids, Lubricants, Capacities and Specifications.

Note: Replace the suction strainer and return line filter after fitting a new or serviced pump.

 

7 After fitting a new or serviced pump and before starting the engine screw the main relief valve out. Run the engine and check for leaks, also check the main relief valve (M.R.V.) operating pressure. Refer to Section E Service Procedures, Pressure Testing – MRV.

Here is the instruction show you guide on how to solve JCB JS140 machine trouble codes C101F-12 fuel level sensor short circuit to battery (For JS140 Side Mounted FLS).

 

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Possible Cause:

1 Faulty fuel sensor.

2 Faulty Wire harness.

3 Faulty Display ECU.

 

Diagnosis:

1 Check the resistance output of fuel sensor between machine grounds & Pin no “B” of fuel sensor. Fuel sensor output shall be between 12Ω – 100Ω Refer below photograph for fuel sensor connection.

2 Check the voltage on wire no. 8028 after disconnecting DECU & Fuel sensor. 24 V shall not be measured on wire no. 8028.If 24V measured on wire no. 8028 then wire got short circuited to machine supply voltage.

Follow the electrical circuit 336/F3635 for fuel sensor connection.

 

Corrective Action:

1 Replace the fuel sensor.

2 Replace the Faulty wire harness.

3 Replace the faulty display ECU.

This instruction show you guide on how to perform load sensing flow and pressure test for JCB JCB 3CX 4CX Backhoe loader.

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With no services operating, there should be no pressure in the load sense line, this is because hydraulic oil flows through the load sense circuit back to the hydraulic tank. If a shuttle valve is ‘stuck’, or a hose kinked, then a pressure could be induced in the load sense lines, this will have an effect on the hydraulic system. To check load sense pressure:

1 Warm the hydraulic oil to working temperature, i.e. 50°C (122°F):

a Set the engine speed to 2200 rev/min.

b Operate the loader shovel dump service to blow off the auxiliary relief valve.

 

2 Lower the backhoe bucket and loader shovel to rest on the ground; stop the engine; operate the control levers to vent residual hydraulic pressure.

3 Connect a 0 – 400 bar (0 – 6000 lbf/in2) pressure gauge to pressure test connector A located on the load sense line from the loader valve.

4 Start the engine and run at 2200 rev/min.

5 Do not move the steering wheel and make sure that all control levers remain in ‘neutral’ position.

6 Check the pressure gauge reading, which should be as specified in Technical Data.

7 If the pressure is higher than specified, first move the steering wheel and then any of the service levers. If this does not reduce the pressure, physically check the load sense lines for trapping or kinking. As a last resort, the service valves may have to be removed and checked for sticking shuttle valves. However, this should not be done until all other checks have been completed.

8 Machines with the load sense pressure relief valve adjust the load sense pressure relief valve E. Machines without a load sense pressure relief valve adjust the regulator valve.