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 TM 55-1925-204-12
(f) Remove diaphragm (3) from unloader.
(6) Installation.
(a) Position a new gasket on cylinder.
(4) Cleaning, inspection, and repair.
(b) Replace head (fig. 5-97). Align gasket and
(a) Clean each valve assembly thoroughly in solvent
replace capscrews which hold head in position. Tighten to 35
conforming to FED SPEC P-D-680.
foot-pound torque.
(b) See that each spring has enough life to snap
valve disc back on its seat quickly. Replace weak springs.
b. Pistons and Connecting Rods.
(c) Inspect valve surfaces for wear. Do not attempt
to grind valves. Worn parts of valve assemblies will be
larger of the two is the low-pressure piston, and the smaller is
replaced.
the high-pressure piston.
The connecting rods and
(d) Examine the diaphragm (3; fig. 5-100) for cracks
or signs of deteriorated material. Replace defective
connecting rod bearings are the insert type and require no
diaphragm.
scraping or shimming when installing new bearings.
(e) Examine all gaskets removed from low-pressure
(2) Removal.
and high-pressure control valves. Replace with new gaskets if
(a) To remove the piston and connecting rod,
worn or show signs of leaking.
remove the cylinder head (a.(2) above).
(5) Assembly.
(b) Remove the six capscrews from the
(a) Position diaphragm (3) on unloader body and
inspection plate (fig. 5-97) on the side of the compressor
replace cover (2) and screws (1). Tighten screws.
block and remove the plate.
(b) Replace high-pressure and low-pressure control
(c) Working through the inspection plate opening
valves in their respective positions in the cylinder head and
remove nuts from connecting rod bearing caps (7, fig. 5-101)
assemble (fig. 5-98 and 5-99).
and remove lower half of bearing cap and bearing shell.
(c) Replace threaded sleeves and covers on low-
pressure control valves and unloader and replace cover on
high-pressure control valves in same position from which
removed.
5-137
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