Lesson 4/Learning Event 2
Step 5. Remove the nut (10) that fastens the shaft (5), washer (9), and gun
handle (8) to the valve body (12). Remove the washer and the gun handle.
Step 6. Press the shaft through the adapter (11), and remove the shaft from
the open end of the valve body. Remove the teflon bushing (7) and O-ring
(6) from the shaft (5).
Step 7.
Remove the ball seat (15) and adapter (11) from the valve body.
Assembly is the reverse of disassembly. When required, shims are installed
between the retainer springs (3). The collar on the body cap (1) must fit
outside of the shoulder of the retainer (4) so the headless pins (13) can be
installed.
Step 8.
Remove the ball seat adjustment gland (9B).
Rotate the retainer
(10).
Step 9. Rotate the gun handle (2) 90 degrees from the valve body (6) and
tilt the body. The ball (11) will slide out of the valve body (6).
Step 10. Remove the nut (1), gun handle (2), spring washer (3), flat washer
(4), and nylon washer (5). Press the shaft (8) through the valve body (6).
Remove the shaft (8) and O-ring (7) from the valve body.
Step 11.
Remove the ball seat (12).
NOTE
The ball seat (12) and O-ring (7) are provided in the gun repair
kit (TM 3-4230-209-20&P). If other parts are required to repair
the ball valve, obtain them through cannibalization.
Step 12.
Replace the ball valve if it cannot be repaired by using parts
from the gun repair kit or cannibalized parts.
Step 13. Assembly is the reverse of disassembly. After the All-Bann valve
is assembled, adjust it to prevent leakage (a and b below).
a. Adjustment.
If fluid leaks between the body and handle of the
valve, tighten the nut above the handle.
Tighten the nut only
enough to stop a leak or until resistance to handle movement is
felt. DO NOT OVERTIGHTEN.
b. Gland adjustment.
If fluid leaks through the body of the valve,
tighten the ball valve seat. First remove the adapter to expose the
ball seat adjustment valve. Tighten the gland only enough to stop
leakage.
As the gland is tightened, increased resistance to gun
handle movement will be felt.
Do not overtighten the adjustment
gland. Then reassemble the ball valve.
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