TM-9-2320-280-34
TRUCK, UTILITY: M998 SERIES
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
JANUARY 1996
TM-9-2320-280-34 - Page 720 of 1258
1 4 - 2 4 . AIR-CONDITIONING COMPRESSOR REPLACEMENT
This task covers:
a.
Removal
b.
Installation
a. Removal
1.
Turn both service valves (3) fully clockwise until front-seated.
2.
Loosen two nuts (2) on service valves (3) slowly to allow refrigerant to escape from compressor (20).
3.
Remove two service valves (3) and O-rings (1) from compressor (20) slowly. Discard
O-rings (1).
4.
Remove screw (10) and clamp (11) from adjusting bracket (6).
NOT E
Prior to removal, tag leads for installation.
5.
Disconnect two compressor leads (23) from two harness leads (24).
6.
Remove nut (9), lockwasher (8), and washer (7) from adjusting bracket (6) and timing chain cover
bolt. Discard lockwasher (8).
7.
Remove two nuts (14), lockwashers (13), washers (12), capscrews (4), washers (5), adjusting
bracket (6), and clamp (21) and washers (7), from compressor (20). Discard lockwashers (13).
8.
Remove drive belt (16) from pulley (15).
9.
Remove adjusting bracket (6) and washer (7) from compressor (20) and timing chain cover bolt.
NOT E
• Perform steps 1 and 2 if compressor is being removed to service other than the A/C
system components.
• Tag service valves “front-seated” for installation.
• Compressors with FR-12 systems are removed the same.
CAUTION
______
Ensure valve holes in compressor and service valves are immediately capped after
service valve removal. Failure to do so may cause damage to compressor.
________
WARNING
________
Air conditioning system must be discharged, prior to replacing components in vapor
system. Failure to do this may result in injury to personnel or damage to equipment.
INITIAL SETUP:
Applicable Models
_______________
M997, M997A1, M997A2
To o l s
____
General mechanic's tool kit:
automotive (Appendix G, Item 1)
M a t e r i a l s / P a rt s
_____________
Five lockwashers (Appendix E, Item 79)
Two O-rings (Appendix E, Item 105)
Lubricating oil (Appendix B, Item 35) (R-12 only)
Lubricating oil (Appendix B, Item 35.1)
(FR-12 only)
Manual Refere n c e s
________________
TM 9-2320-280-20
TM 9-2320-280-24P
Equipment Condition
_________________
• Air-conditioning system discharged (para. 14-17)
(compressor replacement only).
• Right splash shield removed (TM 9-2320-280-20).
• Air filter to air horn hose removed
(TM 9-2320-280-20).
• Disconnect battery ground cable
(TM 9-2320-280-20).
General Safety Instructions
______________________
Air-conditioning system must be discharged, prior
to replacing components.
Maintenance Level
_______________
Direct support
TM 9-2320-280-34
1 4 - 1 2 0
Change 1
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