Precision Control (Servo) - Service Procedures; Testing The Pilot Pressure; Renewing The Pilot Supply Valve Oil Filter - jcb 214e Service Manual

Backhoe loader

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Service Procedures

Position the backhoe to enable access to the pilot

supply valve.

Before proceeding further the pilot circuit accumulator

pressure must be vented.

Stop the engine. With the operator seat set in the rear

facing position (for backhoe operation), switch the

starter to ON without starting the engine. Operate the

joystick controls several times to vent the servo

pressure from the accumulator. Switch the starter

switch to the OFF position.

Connect a 0 - 50 bar pressure gauge to the test point

With the engine running at 1500 revs/min, operate a

backhoe service fully. At the same time check the

reading on the gauge. It should be 35 bar (36 kgf/cm

If necessary adjust the pressure as follows:

Stop the engine. Loosen lock nut B and adjust screw C.

Turn screw C clockwise to increase pressure and anti-

clockwise to decrease the pressure. When the pressure

is correct, tighten the locknut and check the pressure

again. Adjust as required.

Position the backhoe to enable access to the pilot

supply valve.

Stop the engine. Clean off all dirt on and around the

filter cap D. Undo the cap. Remove and discard the

filter element. The servo system is easily damaged by

contaminated hydraulic oil. When installing a new filter

element make sure that no dirt is allowed to enter the

pilot supply valve.

Precision Control (Servo)

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