TM 5-3805-274-13&P
0036
DISASSEMBLY
NOTE
Repair of the control valve is limited to replacement of component
parts of the spool and relief valve assemblies. The spool U-cup seals
are to be replaced if the spool is removed for any reason. Generally
U-cup seals are the cause when there is evidence of valve leakage.
Any damage such as grooving, wear, breakage, scoring, or
discoloration is cause for replacing the component part.
1.
Remove four screws (Figure 1, Item 19), lockwashers (Figure 1, Item 20), and bonnet cap
(Figure 1, Item 21), and diaphragm (Figure 1, Item 18) from valve body (Figure 1, Item 30). Discard
lockwashers (Figure 1, Item 20) and diaphragm (Figure 1, Item 18).
2.
Remove screw (Figure 1, Item 22) and spring assembly consisting of lockwasher (Figure 1, Item 23),
spool collar (Figure 1, Item 24), stop collar (Figure 1, Item 25), centering spring (Figure 1, Item 26), and
stop collar (Figure 1, Item 27). Discard lockwasher (Figure 1, Item 23).
3.
Remove four screws (Figure 1, Item 38), lockwashers (Figure 1, Item 37), and lift-off bracket
(Figure 1, Item 41) from valve body (Figure 1, Item 30). Discard lockwashers (Figure 21, Item 37).
4.
Pull spool (Figure 1, Item 29) from front of valve body (Figure 1, Item 30) enough to expose back
O-ring seal (Figure 1, Item 28) in valve body (Figure 1, Item 30).
5.
Remove back O-ring seal (Figure 1, Item 28). Discard O-ring seal (Figure 1, Item 28).
6.
Push spool (Figure 1, Item 29) toward back of valve body (Figure 1, Item 30) and remove.
7.
Remove front O-ring seal (Figure 1, Item 42). Discard O-ring seal (Figure 1, Item 42).
8.
Inspect and thoroughly clean both seal grooves in valve body (Figure 1, Item 30).
9.
If leaking, remove plugs (Figure 1, Items 2 and 4) and seals (Figure 1, Items 1 and 3). Discard seals
(Figure 1, Items 1 and 3).
10.
If leaking, remove four bolt assemblies (Figure 1, Item 35), lockwashers (Figure 1, Item 36), cover
(Figure 1, Item 34), and seals (Figure 1, Items 31, 32, and 33) from valve body (Figure 1, Item 30).
Discard lockwashers (Figure 1, Item 36) and seals (Figure 1, Items 31, 32, and 33).
11.
If replacement of relief valve is necessary, remove cap cover (Figure 1, Item 17) and washer
(Figure 1, Item 16).
12.
Remove jam nut (Figure 1, Item 15) and washer (Figure 1, Item 14).
13.
Remove adjustment screw (Figure 1, Item 13) and spring (Figure 1, Item 12).
14.
Remove valve housing (Figure 1, Item 8), seal (Figure 1, Item 7), washer (Figure 1, Item 6), seal
(Figure 1, Item 5), and seal (Figure 1, Item 11) from valve body (Figure 1, Item 30).
15.
Remove guide ball (Figure 1, Item 10), seal (Figure 1, Item 11), and ball (Figure 1, Item 9) from valve
housing (Figure 1, Item 8). Discard seal (Figure 1, Item 11).
16.
If replacement is necessary, remove adapter (Figure 1, Item 40) and washer (Figure 1, Item 39) from end
of spool (Figure 1, Item 29).
0036-2
