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 TM 55-1905-217-34
(3) Secure housing (1) in a pipe vise and remove screw (10), lockwasher (9), retaining plate (8). Screw 1/2 inch-20
fitting into air valve port and push end cap (7) away from ring segments (12 and 13). Remove ring segments and pull out
end cap (7).
(4) Repeat same procedure for removing the oil end cap (2) as for removing the air end cap (7) being sure to use the
proper fitting for the oil port size.
(5)With a wooden dowel, push piston (6) out of cylinder (1).
(6) Remove the gaskets (3) and teflon rings (5) from piston (6) and end caps (2 and 7). d. Cleaning, Inspection, and
Repair.
(1) Clean all parts with an approved solvent.
(2) Housing(1 ). Use a drop light to examine the bore of the cylinder. The bore must be smooth and free of
scratches. Check segment ring grooves.
(3) Caps (2 and 7). Examine for damage. Check fitting threads, valve threads and fuse holder thread if holder has
been removed.
(4) Piston. Examine for scratches or scoring on o.d. The piston must be checked in cylinder to be sure it moves
freely throughout the entire length of cylinder.
(5) Air valve (11). Examine threads and replace if damaged. Check for damaged valve seat.
(6) Teflon rings (5). Replace if damaged.
(7) Gaskets (3). Replace all gaskets with new ones.
e. Reassembly.
(1) Install teflon rings (5, fig. 4-22) on piston (6). Use oil or grease to lubricate the gaskets (3) and install gaskets on
piston (6).
(2) Coat i. d. of cylinder with light oil. Use loading sleeve, covering the split ring groove, carefully insert the piston (6)
including its gaskets and teflon rings into the housing bore with the closed end first. Observe that teflon rings are
correctly installed and gaskets are coated with BM 1546 grease. Gaskets must not be twisted or otherwise damaged.
Once piston has entered cylinder, push it half way down in cylinder.
(3) Install teflon rings (5) and gaskets (3) to cap ends (2 and 7) with gasket toward the fluid end. Install teflon rings
before installing gaskets. Apply light grease to gaskets (3) to insure that they remain in place. Using loading sleeve,
slide end cap (2) with the oil port, into the housing beyond the normal position. Be sure oil end cap is on the side with the
head of the piston (6).
(4) Install retainer ring segments (12 and 13) and hold in place. Push piston (6) against oil end cap to position end
cap (2) against the retainer plate (8), lock washer and screw (9 and 10).
(5) Using loading sleeve, slide end cap (7) into the housing beyond the normal position. Install retaining rings (12 and
13) and hold in place. Apply pneumatic or mechanical force of 50 lbs. psi max., to position end cap (7) against the
retaining plate (8), lock washer and screw (9 and 10). Release pressure and remove assembly fittings.
(6) Install valve (11) with gasket (11A), torque valve (11) to 45-50 ft- lbs DO NOT tighten the locknut. Where safety
fuse holder (4) with gasket (4A) was removed, install with new gasket (4A) and torque to 20-25 ft-lbs.
(7) The accumulator is now ready to be charged with nitrogen gas. Continue to charge accumulator until desired
pressure is attained. Close valve on nitrogen tank and tighten locknut on air valve to 140-160 in-lbs. Remove charging
hose and install protection cap (11B).
f. Installation. Install the accumulator in reverse order of removal (b above).
4-9. Hydraulic Hand pump
a. Removal. Remove the hand pump (TM 55- 1905-217-12, para 4-62).
b. Disassembly.
(1) Disconnect operating lever (30, figure 4- 23) pump housing (1) and plunger (22). Remove retaining ring (23) and
clevis pin (24) before removing link assembly (27).
4-35
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