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 TM 55-1905-220-14-4
3-47. ACCUMULATOR - MAINTENENCE INSTRUCTIONS.
a. The accumulator is a heavy duty shell assembly and piston designed to hold nitrogen pressure-for an
extended period of time.
b. The accumulator is pre-loaded with nitrogen through a small valve and sealed at the time of
manufacture. A seal ring in the groove of the piston between two back-up rings prevents the nitrogen from
entering the hydraulic system. The nitrogen is stored in the air valve end of the accumulator and the fluid is
discharged at the opposite end.
c. A seal ring and back-up ring at each cap prevents escape of fluid and nitrogen from the shell. Nitrogen
is an inert gas. Nitrogen will not rust or corrode the piston or accumulator.
d. Oil enters the accumulator under pressure from either the engine-driven pump or hand pump and forces
the piston back, compress- ing the nitrogen and storing energy to operate the system.
e. Service replacement accumulators are supplied with a precharge of nitrogen [1250 + 50 psi (8619 + 345
kpa)].
This task covers:
a. Inspection
b. Replacement
INITIAL SETUP :
Test Equipment
Reference
None
None
Equipment
Special Tools
Condition
Condition Description
None
None
Material/Parts
Special Environmental Conditions
None
None
Personnel Required
General Safety Instructions
1
Observe WARNINGS in this procedure.
3-909
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