SUB-SECTION 4D
CONTROL VALVES
Figure 4D-15. Control Valve (36Z840)
E. Insert a suitable drift pin through one of the holes in
3. Slide the spool section off the through-bolts. Be sure
the spool as shown in Figure 4D-16. Use a screwdriver
check balls (31) are not lost when the spool section is slid
between the clevis ears to unscrew plug (30). Plug
off the through-bolts. Note the number and location of the
(20) can be removed using a suitable screwdriver.
O-rings on the spool section. If the spool section must be
Springs (22) and poppets (23) can now be removed
disassembled, proceed as follows:
from the spool.
4. Slide spacer (34) off the through-bolts. The other spool
A. Remove screws (29) and seal retainer (26).
and inlet section can now be removed and disassembled as
B. Remove screws (18) and cap (19). Note that a suit-
described above.
able twelve point socket wrench must be used to
remove the screws.
INSPECTION AND REPAIR. After the valve has been
disassembled, wash the parts with cleaning solvent, and dry
C. Carefully push the spool out of valve body (15).
the parts with clean compressed air. Be sure to blow out the
orifices and internal passages of the valve. After the parts
D. Remove O-ring (28) and wipers (27) from the valve
are cleaned, inspect and repair the following:
body counterbores.
4D-22
