Section E - Hydraulics
Fault Finding
Loader Circuit
E - 45 E - 45
9803-9450-2
Make sure that associated load hold check valve
is operating.
On servo machines, check operation of joystick
and feed hoses.
On manual machines, check that control lever and
associated linkage is operating the spool, rectify
as required.
16 Valve spool not moving fully from
neutral to full selection.
Spool movement should be 5.5 mm (0.22 in)
On servo machines, check servo (charge)
pressure.
17 Valve spool leaking Rectify, check for contamination.
18 Piston rod bent. Replace piston rod. Check pressure setting of
MRV.
Check that associated pivot pins are adequately
greased.
19 Poor engine performance. Check engine performance.
20 Manual control linkage bent. Disconnect linkage. Repair linkage or renew.
21 Oil cooler obstructed. Remove debris from cooler fins.
22 Oil temperature abnormally high. Check for correct fluid. Check oil cooler and grille
for blockage.
23 Hydraulic fluid dirty. Clean tank strainer. If strainer badly clogged, drain
and flush hydraulic system then fill with clean
hydraulic fluid.
24 Service pipe connection over
tightened.
Check tightness.
25 Valve housing twisted during
installation.
Loosen retaining bolts and tighten to correct
torque.
26 Bent spool. Dismantle control valve. Renew spool as
necessary.
27 Spool return spring broken. Renew as necessary.
28 Spool return spring or cap out of
alignment.
Remove cap, check that spring is in correct
position.
Refit cap and torque tighten bolts.
29 Temperature distribution within control
valve not uniform.
Warm up entire system before using service.
Key to Cause Remedy Page Ref.
To Next Page
Loading...
