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