jcb Mini CX - Page 241

Section E - Hydraulics
Problem Solving
Loader/Excavator Circuit
E-71 E-71
9803-9340-8
13 Valve spool not operating Check for leaks, rectify as required. Make sure
that associated load hold check valve is
operating.
K Loader
Valve ( T E-131) or
K Excavator
Valve ( T E-133)
14 Valve spool not moving fully from neutral
to full selection
Spool movement should be 5 mm (0.2 in).
15 Valve spool leaking Rectify, check for contamination. K Loader
Valve ( T E-131) or
K Excavator
Valve ( T E-133)
16 Piston rod bent Replace piston rod. Check pressure setting of
MRV. Check that associated pivot pins are
adequately greased.
K Rams ( T E-145)
17 Poor engine performance Check engine performance.
18 Oil cooler obstructed Remove debris from cooler fins.
19 Oil temperature abnormally high Check for correct oil K Fluids, Lubricants and
Capacities ( T 3-11). Check oil cooler and grille
for blockage.
20 Hydraulic fluid dirty Clean tank strainer. If strainer is badly clogged,
drain and flush hydraulic system then fill with
clean hydraulic oil.
21 Service pipe connection over tightened Check tightness.
22 Valve housing twisted during installation Loosen retaining bolts and tighten to correct
torque.
K Loader
Valve ( T E-131) or
K Excavator
Valve ( T E-133)
23 Bent spool Dismantle control valve. Renew spool as
necessary.
24 Spool return spring broken Renew as necessary.
25 Spool return spring or cap out of alignment Remove cap, check that spring is in correct
position.
26 Temperature distribution within control
valves not uniform
Warm up entire system before using service.
27 Incorrect attachments fitted, eg Jack
Hammer
Ensure attachments are JCB approved for the
Mini CX.
KEY TO CAUSE REMEDY PAGE REF.