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
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