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TM 55-1905-219-14-10
2. Accumu-
Normally, no maintenance of the accumulator is required other than painting to
resist external corrosion. However, if there is a loss of the nitrogen precharge
pressure due to a leaky air valve, indicated by bubbles in a soap solution applied
around the valve, or due to leakage past the piston, indicated by bubbles and
foaming in the reservoir, replace either the air valve or the piston seal rings as
required. Seal rings between the end cap and the shell will rarely require
replacement, unless the accumulator is disassembled.
a. If a defective air valve was the cause of leakage,
remove the air valve cover (2) from the accumulator
cap (11), and the air valve cap (12) from the air
valve. Loosen the 5/8 inch hex swivel nut on the
air valve stem (13) approximately 1-1/2 turns and
then depress the valve core to release any remain-
ing nitrogen pressure before removing the air
valve. Remove the valve (13) and replace it with
a new part.
However, if damaged piston and cap seal rings are
surmised, continue with the disassembly.
b. Remove the accumulator caps (11) and (14) from the
shell with a strap wrench, then push the piston
(15) out of the shell (16) by hand.
Remove and discard the seal ring (17) and the back-
up rings (18) from the piston (15).
d. Remove and discard the seal rings (19) and the back-
up rings (20) from the shell.


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