TM-9-2320-260-34-1
TRUCK, 5-TON, 6X6, M809 SERIES (DIESEL)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE; VOLUME 1 OF 2
JULY 1994
TM-9-2320-260-34-1 - Page 630 of 657
TM 9-2320-260-34-1
11-5. AIR COMPRESSOR REPAIR (Contd)
10.
11.
12.
13.
14.
15.
16.
17,
18.
Inspect front support (1) for scratches, scoring, and breaks. Measure outside diameter of thrust
Support flange(2) in front support(1) for wear. Refer to table 11-4, Air Compressor Wear Limits, for
measurements. Replace front support (1) if scratched, scored, broken, or if thrust support flange (2)
is worn past limits.
Measure inside diameter of crankshaft bore (3). Refer to table 11-4, Air Compressor Wear Limits,
for measurements. Replace front support (1) if crankshaft bore (3) is worn past limits.
Measure thrust bearing (4) for wear. Refer to table 11-4, Air Compressor Wear Limits, for
measurements. Replace thrust bearing (4) if worn past limits.
Inspect support bearing (5) for scoring, wear, or other damage. Replace support bearing (5) if scored,
damaged, or worn past limits. Refer to table 11-4, Air Compressor Wear Limits, for measurements.
Replace support bearing (5) if damaged.
Inspect drive gear (6) for wear, scoring, or damage. Replace drive gear (6) if worn, scored, or
damaged.
Inspect connecting rod bushing (7) for scoring or damage. Replace connecting rod bushing (7) if
scored or damaged.
Inspect connecting rod (9) for cracks, breaks, bends, and wear. Measure piston pin (8) and crank-
shaft (10) bores for wear. Refer to table 11-4, Air Compressor Wear Limits, for measurements.
Replace connecting rod (9) if damaged or worn.
Inspect piston (11) for scoring, cracks, or damage. Measure piston (11) for wear. Refer to table 11-4,
Air Compressor Wear Limits, for measurements. Replace piston (11) if scorn, cracked, damaged, or
worn past limits.
Measure piston pin (12) for wear. Refer to table 11-4, Air Compressor Wear Limits, for measure-
ments. Replace piston pin (12) if worn past limits.
Table 11-4. Air Compressor Wear Limits.
WEAR LIMITS/TOLERANCES
NO.
ITEM/POINT OF MEASUREMENT
INCHES
MILLIMETERS
1
Front support
2
Thrust support flange - outside diameter –
minimum
1.287
32.69
3
Crankshaft bore - inside diameter - maximum
1.877
47.68
4
Thrust bearing thickness, - minimum
0.290
7.366
9
Connecting rod
8
Piston pin bore – inside diameter - maximum
0.689
17.50
10
Crankshaft bore w/o bushing (7) -
inside diameter – maximum
1.935
49.15
11
Piston
Skirt diameter - minimum
3.617
91.87
Piston pin bore - maximum
0.689
17.50
12
Piston pin – outside diameter – minimum
0.687
17.45
11-18
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