TM 9-2320-260-34-2
I
16-17. HOIST WINCH MAINTENANCE (M816) (Contd)
c. Cleaning and Inspection
1.
For general cleaning instructions, refer to para. 2-8.
For general inspection instructions, refer to para. 2-9.
2.
3. Inspect drum shaft (3), input shaft(s), and wormshafts (4) for bends, cracks, breaks, chips, and wear.
Refer to table 16-12, Hoist Winch Wear Limits, for measurements. Replace drum shaft (3), input
shaft (5), and wormshaft (4) if damaged or worn.
4. Inspect drum (9), cover (7), gearcase (6), bracket (2), and plate (1) for cracks, bends, damaged
threads, and wear. Refer to table 16-12, Hoist Winch Wear Limits, for measurements. Replace
drum (9), cover (7), gearcase (6), bracket (2), and plate (1), if damaged or worn.
5. Inspect gearcase bearings (7) and thrust washers (10) for wear. Refer to table 16-12, Hoist Winch
Wear Limits, for measurements, Replace gearcase bearings (8) and thrust washers (10) if worn.
6. Inspect worm gear (11) and input shaft gear (12) for cracks, nicks, burrs, ridged, chipped, broken
teeth, or particles in teeth of worm gear (11). Refer to table 16-12, Hoist Winch Wear Limits, for
measurements. Replace worm gear (11) and input shaft gear (12), if damaged or worn.
Table 16-12. Hoist Winch Wear Limits.
WEAR LIMITS/TOLERANCES
ITEM
ITEM/POINT OF MEASUREMENT
NO.
INCHES
MILLIMETERS
1,2
Shaft support (2)
2.130
Inner diameter bushing maximum
54.10
Drum shaft
3
2.123
Outer diameter four places minimum
53.92
Wormshaft
4
1.771
Outer diameter bearing journal minimum
44.98
1.765
Outer diameter sealing surface minimum
44.83
1.746
5
Input shaft outer diameter minimum
43.35
6
Gearcase
Inner diameter bushing maximum
2.130
54.10
4.469
Width cover edge to hub
113.51
Inner diameter bearing bores (2) maximum
3.937
100.00
7
Cover
Inner diameter bushing maximum
2.130
54.10
2.000
Width bushing hub minimum
50.8
Bearings (2)
8
Inner diameter inner race maximum
1.771
44.98
Outer diameter outer race minimum
3.936
99.97
4.992
126.80
9
Drum - outer diameter minimum
10
Thrust washers (2) thickness minimum
0.062
1.57
11
Worm gear width hub - minimum
2.492
63.30
Input shaft gear
1.88
12
47.75
16-98
