104
112
113
109
110
111
114
115
102
116
117
118
114
TM 9-4940-568-34
8-11
NOTE
Low pressure air piston assembly
and high pressure air piston
assembly are disassembled
identically.
(32)
Remove two lock rings (109), piston pin
(110) and high pressure connecting rod
(104) from high pressure air piston (111).
NOTE
High pressure air piston has four
ring design, with a compression
ring in the first groove, scraper
ring in second groove and two oil
control ring assemblies (expander
and reel) in the third groove.
Rings should be removed using
an expander tool.
Remove rings beginning with the
first groove.
(33)
Remove compression ring (112) from first
groove on high pressure air piston (111).
Discard compression ring.
(34)
Remove scraper ring (113) from second
groove on high pressure air piston (111).
Discard scraper ring.
(35)
Remove two oil control rings (114) from
third groove on high pressure air piston
(111). Discard oil control rings.
(36)
Repeat Steps (32) through (35) for low
pressure air piston assembly.
NOTE
Bearings will need to be pressed
off for removal.
(37)
Remove snapring (115), bearing (116),
spacer (117) and bearing (118) from
crankshaft (102).
