jcb 1CX, Service Manual

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14 - 0A
Section E Hydraulics
9803/8550
Section E
14 - 0A
Issue 1
Valves
KEY TO CAUSE REMEDY PAGE REF.
10 Neutral circuit or low pressure lines leaking, Check pipe lines and replace as required.
damaged, trapped or kinked.
11 Restriction in neutral circuit lines. Check hoses and pipes, replace as necessary.
12 Air in hydraulic system Bleed system.
13 Service pipe lines leaking, damaged, Check hoses and pipes, replace as required.
trapped or kinked.
14 Ram or pipe lines from ram leaking. Check and rectify as required.
15 Valve spool not operating. Check for leaks, rectify as required. Loader E14-2
Make sure that associated load hold check valve Excavator E17-1
is operating.
Check operation of joystick and feed hoses.
16 Valve spool not moving fully from Spool movement should be 5 mm (0.2 in) Loader E14-2
neutral to full selection. Excavator E17-1
Check servo (charge) pressure. E12-3, E12-11
17 Valve spool leaking Rectify, check for contamination. Loader E14-2
Excavator E17-1
18 Piston rod bent. Replace piston rod. E22-1
Check pressure setting of MRV. E15-1
Check that associated pivot pins are adequately greased.
19 Poor engine performance. Check engine performance. K1-1
20 Oil cooler obstructed. Remove debris from cooler fins.
21 Oil temperature abnormally high. Check for correct fluid, see Lubricants and
Capacities. Check oil cooler and grille for blockage.
22 Hydraulic fluid dirty. Clean tank strainer. If strainer badly clogged, drain and E27-1
flush hydraulic system then fill with clean hydraulic fluid.
23 Service pipe connection over tightened. Check tightness.
24 Valve housing twisted during installation. Loosen retaining bolts and tighten to correct torque. Loader E14-1
25 Bent spool. Dismantle control valve. Renew spool as necessary. Loader E14-2
Excavator E17-1
26 Spool return spring broken. Renew as necessary. Loader E14-2
Excavator E17-1
27 Spool return spring or cap out of alignment. Remove cap, check that spring is in correct position. Loader E14-2
Refit cap and torque tighten bolts. Excavator E17-1
28 Temperature distribution within Warm up entire system before using service.
control valves not uniform.
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