Trouble Shooting - jcb JS200 Service Manual

Section E
78 - 2
Trouble Shooting (continued)
Item Symptoms Related Parts
Rod packing
Piston rod
1 sliding part
oil leakage Back up ring
Cylinder head
9803/6400
Packaging rubber elasticity is
gone and breaks into pieces.
(Buffer ring,
U-ring)
Lip is deficient all around.
The protrusion of the heel of the
packing is excessive.
Foreign matter is biting into the
Wiper ring lip. The lip is damaged.
There are also other abnormal
damage.
Wear is large and the clearance
with piston rod exceeds the
*maximum permissible value.
Bushing (*Refer to maintenance standards
for maximum permissible value.)
Large scratch on the sliding part.
Scratches, rust on the seal
attachment parts.
Hydraulics
Hydraulic Rams
Trouble Treatment
The packing life or hydraulic oil
deterioration and high temperature are
possible reasons.
1. Renew hydraulic oil.
2. Check the hydraulic oil temperature.
(Below 80 C is advisable).
3. Check if high temperature locally.
Replace.
It is possible that abnormal high pressure
is working on the packing.
1. Check the operation pressure, cushion
pressure.
2. Part which is attached to the buffer ring
may be abnormal. Inspect the buffer
ring.
As a rule, replace the rod packing at the
same time. (It is desirable to replace parts
which are attached to the buffer ring at the
same time).
It is possible that abnormal high pressure
is the cause. Check the same as above
(heel of packing protruding).
Remove the foreign matter.
Replace.
Replace.
Replace.
Also inspect the piston rod.
Remove scratch, rust with oil stone. If it
cannot be repaired, replace the cylinder
head.
Section E
78 - 2
Issue 1