Legend for Figure 7
A.
AUXILIARY I CONTROL VALVE SECTION
B.
AUXILIARY II CONTROL VALVE SECTION
1. PLUG
2. O-RING
3. SPRING
4. WASHER
5. SOCKET HEAD CAPSCREW
6. PROPORTIONAL PRESSURE REDUCING
VALVE (PPRV)
7. SPOOL
8. POPPET
9. AUXILIARY I CONTROL VALVE BODY
10. BACKUP RING
11. AUXILIARY II CONTROL VALVE BODY
12. O-RING
NOTE:
For four function control valve, perform
Step 2 and Step 3. For three function control valve,
perform Step 3.
2.
Remove the auxiliary II control valve section
from the four tie rods. Remove and discard O-
rings (13, Figure 7) from side of the auxiliary I
control valve section.
3.
Remove the auxiliary I control valve section
from the four tie rods. Remove and discard O-
rings from the side of tilt control valve section.
See Figure 7.
Disassemble
NOTE:
Disassemble the auxiliary control valve sec-
tion only as needed to accomplish the repairs re-
quired. The disassemble procedures for the auxili-
ary I and II sections are the same. The auxiliary I
section is used in the procedures described below
because it contains the anti-stall valve.
1.
Remove four capscrews and two proportional
pressure reducing valves (PPRV) from the aux-
iliary control valve section. Remove and discard
the backup ring, two O-rings, backup ring, and
O-ring from each PPRV. See Figure 7.
2.
Remove the plug, spring, washer, and spool
from the auxiliary control valve section. Dis-
card the O-ring on the plug. See Figure 7.
3.
Remove the plug, spring, and washer from the
auxiliary control valve section. Discard the O-
ring on the plug. See Figure 7.
4.
Remove two plugs, two springs, and two pop-
pets from the auxiliary control valve section.
Discard one O-ring from each plug. See Fig-
ure 7.
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 auxiliary control valve
section have been removed, clean the auxiliary
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 auxiliary control valve section using a lint-
free cloth.
Inspect
Inspect the auxiliary control valve section mating
surfaces and any open bores for damage. If damage
is found, replace the auxiliary control valve section.
If the spool has been removed, inspect the spool
and the bore for damage. If damage to either the
spool or the bore is found, replace the auxiliary con-
trol valve section.
NOTE:
If the auxiliary control valve section is not
to be reassembled immediately, coat surfaces with
clean hydraulic oil to prevent the possibility of rust.
Cover the auxiliary control valve section with a
clean, dry, lint-free cloth to prevent the possibility
of contaminants entering the auxiliary control
valve section.
2000 SRM 1899
Main Control Valve Repair
9
