55 - 2
Symptoms
Possible Causes
Counter measures
1 Control flow is high or low.
Contamination in the sliding section
Dismantle and clean the valve.
of the plunger
1.
Repair the outer section or replace
the plunger sub-assembly.
Settling of the spring
3
.
Replace the spring.
Damage to the orifice
4
.
Replace the plunger sub-
assembly.
2 Outside oil leakage
Damage to the o-ring parts.
Replace o-ring.
Cushion Valve Operation
When the pressurised oil flows from port A to port B, the
plunger
1
is moved towards the right.
When the pressurised oil flows from port B to port A, the
plunger
1
is moved to the left. The oil passes through the
narrow part of the plunger
1
and flows freely.
Maintenance
Replace the o-ring and other seal parts each time the
assembly is Dismantled.
If there is irreparable damage to the plunger
1
or injury to
the orifice
4
, replace the whole plunger sub-assembly.
Section E
Hydraulics
9803/6020
Section E
55 - 2
Issue 1
Cushion Valve
1
Plunger
2
Restrictor
3
Spring
4
Orifice
5
Connector
6
Body
7
Sleeve
8
-
9
-
10
Snap Ring
11
O-ring
12
O-ring
13
O-ring
14
-
15
Plunger Sub-Assembly
Summary of Contents for JS70
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