All Hydraulic Rams Slow To Operate; One Hydraulic Service Fails To Operate Or Is Slow To Operate; The Engine Tends To Stall When Hydraulics Are Under Load - jcb 214e Service Manual

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Section E
15 - 2
Fault

All hydraulic rams slow to operate.

2
3 One hydraulic service fails to
operate or is slow to operate.
The engine tends to stall when
4
hydraulics are under load.
9803/3280
Hydraulics
Fault Finding
Probable Cause
Neutral circuit or low pressure
lines leaking, damaged, trapped
or kinked.
Low pump flow.
Priority valve operating.
Main relief valve (MRV)
setting incorrect.
Unloader valve
Tank filter by-pass valve
Hydraulic tank breather
Associated service pipe lines ,
leaking damaged, trapped
or kinked.
Associated ram leaking.
Auxiliary relief valve (ARV)
setting incorrect.
Associated valve block section
leaking or not operating.
Check valve malfunctioning
(if fitted, e.g. stabiliser circuit)
Hose burst protection valve
(if fitted) malfunctioning.
Piston rod is bent
M.R.V setting incorrect.
Poor engine performance.
Unloader valve pressure
setting too high
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Action
Check pipe lines and replace as required.
Check pump flow, if required service or
replace pump.
Check if the priority valve is sticking,
rectify as required.
Check and adjust as required.
Check if unloader valve is sticking, i.e.
dumping flow from pump section P2.
Check condition of hydraulic filter
Clean or replace the breather
Check hoses, replace as required.
Complete ram leakage check, replace
seals as required.
Check and adjust as required.
Check for leaks, rectify as required.
Also, see fault 6 'Leaking Oil Seal
(Control Valves)'.
Make sure that the associated load hold
check valve is operating.
Check that the control lever and
associated linkages is operating
the spool, rectify as required. Also, see
fault 5, 'A spool is Sticking'.
Test check valve, rectify as required.
Test HBPV, service as required.
Replace piston rod, check pressure
settings of MRV and ARV.
Check that associated pivot pins are
adequately greased
Check and adjust as required.
Check engine performance, see
transmission section for stall speed
test procedures.
Check pressure setting of the
unloader valve.
Section E
15 - 2
Issue 1