TM-9-2320-260-34-2
TRUCK, 5-TON, 6X6, M809 SERIES (DIESEL)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE; VOLUME 2 OF 2
JULY 1994
TM-9-2320-260-34-2 - Page 103 of 863
15-15. HOIST CYLINDER MAINTENANCE (Contd)
c. Cleaning and Inspection
1. For general cleaning instructions, refer to para. 2-8.
2. Inspect three check balls (2) for scratches, chips, and seat wear marks. Replace check balls (2) if
scratched, chipped, or marked.
3.
Inspect three springs (1) for wear. Replace springs (1) if spring free length is not 1.25 in. (31.75 mm).
4.
Inspect orifice plug (4) for scratches and chips. Replace orifice plug (4) if scratched or chipped.
5. Inspect cylinder housing (3), piston (5), piston rod (6), retainer (7), and cylinder head (8) for cracks,
breaks, scratches, chips, scoring, and excessive wear. Refer to table 15-1, Hoist Cylinder Wear
Limits, for measurements. Replace part(s) if damaged or worn.
Table 15-1. Hoist Cylinder Wear Limits.
ITEM
WEAR LIMITS/TOLERANCES
NO.
lTEM/POINT OF MEASUREMENT
INCHES
MILLIMETERS
3
Cylinder housing – inner diameter
5.250-5.254
133.35-133.45
5
Piston
Outer diameter
5.241-5.244
133.12-133.20
Inner diameter
1.251-1.252
31.78-31.80
6
Piston rod
Outer diameter
1.997-2.000
50.72-50.80
Inner diameter
1.249-1.250
31.72-31.75
7
Retainer
Outer diameter
2.618-2.620
66.50-66.55
Inner diameter
2.005-2.007
50,93-50.98
8
Cylinder head
Outer diameter
5.246-5.248
133.25-133.30
Inner diameter
4.770-4.774
121.16-121.26
15-42
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