TM-9-2320-361-34
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
MAY 1992
TM-9-2320-361-34 - Page 349 of 764
TM9-2320-361-34
1
15-10. DISCHARGE VALVE REPAIR (M50A2)
(Contd)
I
b. Cleaning and Inspection
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
15-38
Wash all parts with soap and hot water. Rinse all parts with hot water and dry using a
clean,
soft rag.
Table 15-1. Discharge Valve Wear Limits.
ITEM
WEAR LIMITS/TOLERANCES
NO.
lTEM/POINT OF MEASUREMENT
STANDARD
METRIC
2
Upper plunger (bonnet end diameter)
0.48-0.51 in.
12.19-12.95 mm
3
Bonnet (plunger hole diameter)
0.50-0.51 in.
12.70-12.95 mm
4
Spring
Free length
5.18-5.43 in.
131.6 -137.9 mm
Compressed to 2.43 in. (61.7 mm)
22-28 lb-in.
2.5- 3.2 N.m
5
Plug (stem hole diameter)
0.65-0.66 in.
16.51-16.76 mm
8
Cam stem:
Inside stem bore end diameter
0.42-0.43 in.
10.67-10.92 mm
Plug end diameter
0.644-0.648 in.
16.36-16.46 mm
Machined with square
0.49-0.50 in.
12.44-12.70 mm
9
Lower plunger (length)
3.23-3.26 in.
82.64-82.80 mm
10
Discharge valve housing
Inside stem bore/inner diameter
0.43-0.44 in.
10.67-11.18 mm
Outer stem bore/inner diameter
0.65-0.66 in.
16.51-16.76 mm
Inspect discharge valve housing (10) for scoring, cracks, or thread and mating surface damage and
wear. Refer to table 15-1, Discharge Valve Wear Limits, for measurements. Replace if damaged or
worn past limits.
Inspect bonnet (3) for cracks, thread damage, and wear at plunger hole. Refer to table 15-1,
Discharge Valve Wear Limits, for measurements. Replace bonnet (3) if damaged or worn past limits.
Inspect upper plunger (2) for wear, bends, cracks, and thread damage. Refer to table 15-1, Discharge
Valve Wear Limits, for measurements. Replace upper plunger (2) if damaged or worn past limits.
Inspect lower plunger (9) for wear, bends, cracks, and thread damage. Refer to table 15-1, Discharge
Valve Wear Limits, for measurements. Replace lower plunger (9) if damaged or worn past limits.
Inspect nut (1) for thread and mating surface damage. Replace if damaged.
Inspect cam (7) for mating surface damage at lower plunger. Replace if damaged.
Inspect cam stem (8) for bends, cracks, and machined surface wear. Refer to table 15-1, Discharge
Valve Wear Limits, for measurements. Replace cam stem (8) if damaged or worn
past limits.
Inspect plug (5) for wear and thread damage. Refer to table 15-1, Discharge Valve Wear Limits, for
measurements. Replace plug (5) if damaged or worn past limits.
Inspect lever arm (6) for cracks or pinhole damage. Replace if damaged.
Inspect spring (4) for collapsed coils or breakage. Replace if damaged.
Inspect spring (4) length. Refer to table 15-1, Discharge Valve Wear Limits, for measurements.
Replace sping (4) if worn past limits.
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