4.
Remove the socket head plug, spring, and
washer from top of lift/lower control valve sec-
tion. Remove and discard O-ring from plug. See
Figure 9.
5.
Remove load check valve, spring, O-ring, and
poppet. Discard O-ring. Remove and discard O-
ring from load check valve. See Figure 9.
Clean
WARNING
Cleaning solvents can be flammable and toxic and
can cause skin irritation. When using cleaning
solvents, always follow the solvent manufactur-
er's recommended safety procedures.
WARNING
Compressed air can move particles so they cause
injury to the user or to other personnel. Make sure
the path of the compressed air is away from all
personnel. Wear protective goggles or a face
shield to prevent injury to the eyes.
1.
If all components of the lift/lower control valve
section have been removed, clean the lift/lower
control valve section and components, except
the two PPRVs, using cleaning solvent and dry
using compressed air.
2.
If all components have not been removed, clean
the lift/lower control valve section using a lint-
free cloth.
A.
TOP
B.
BOTTOM
1. PROPORTIONAL PRESSURE REDUCING
VALVE
2. SOCKET HEAD PLUG
3. SPRING
4. POPPET
5. O-RING
6. SPOOL
7. LOAD CHECK VALVE
8. PISTON
9. BACKUP RING
Figure 9. Lift/Lower Control Valve Section
2000 SRM 1899
Main Control Valve Repair
13