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ARMY TM 9-4120-381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
15.
Remove four counterweight and eccentric strap capscrews (35) and locknuts (31).
NOTE
· Motor end counterweight) will remain on eccentric shaft until shaft is removed.
· Label counter weights and eccentric shaft shields so they can be reinstalled in same position on
eccentric shaft.
16.
Remove oil pump end counterweight (1) and two eccentric strap shields (32) and (33).
NOTE
Label eccentric straps so they may be reinstalled in the same position on eccentric shaft.
17.
Pull eccentric shaft out thru pump end (22). Guide eccentric straps (34) from eccentric shaft during removal
process. Rotate shaft and tap it lightly to prevent straps from jamming.
18.
Remove motor end counter weight (30).
19.
Remove eccentric straps (34) thru bottom cover plate opening (21).
NOTE
Keep each piston assembly together for reassembly.
20.
Remove lockrings (2) and piston pins (3).
21.
Remove pistons (6) from eccentric straps (34).
22.
Remove oil ring (4) and compression rings (5).
INSPECTION
1.
Check all removed components for damage, replace as necessary.
2.
Check tolerance of parts removed (Table 5-4).
3.
Replace crankshaft, pistons and rods if out of tolerance.
4.
Check cylinder bore (20) and motor end (19) main bearing tolerances, replace compressor if either one is out of
tolerance.
REPAIR
Repair consists of replacing pistons, eccentric straps, oil and compression rings, and eccentric shaft.
REASSEMBLY
1.
Position pistons (6) on eccentric straps (34).
NOTE
When lockrings are installed on pistons, they should be tight enough so they can not be turned by hand.
2.
Install piston pins (3) and lockrings (2).
3.
Check ring gap by inserting each ring separately in cylinder (6), approximately 3/8 inch (0.95 cm) from top. Ring
gap should be between 0.013 and 0.005 inch (0.03 and 0.013 cm) .
4.
Install oil ring (4) in bottom groove of piston (6) with notch end on bottom.
5.
Install compression rings (5) in top groove of piston (6) with side marked top towards piston head.
6.
Stagger ring gaps around pistons (6).
5-115
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