jcb JS300 Service Manual page 768

Fault Finding
Symptom
Low secondary pressure.
Unstable secondary pressure.
High secondary pressure.
E-107
Possible cause
Primary pressure is low.
Spring 4 is damaged.
Clearance between the spool and
seating is too large.
The handle unit is loose.
Sliding parts are sticking.
Fluctuations in the tank line pressure.
Air is trapped in the piping.
The tank line pressure is too high.
9813/5100-1
Section E - Hydraulics
Hydraulic Control Levers
Dismantling and Assembly
Remedy
Apply the correct primary pressure.
Renew the spring.
Renew the remote control valve
assembly.
Dismantle, reassemble or renew the
handle unit.
Release the sticking part.
Check return line and filter for
blockage.
Operate the valve several times to
remove the air.
Check return line and filter for
blockage.
Release the sticking part.
E-107