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.
WEAR LIMITS/TOLERANCES
ITEM
lTEM/POINT OF MEASUREMENT
NO.
INCHES
MILLIMETERS
133.35-133.45
5.250-5.254
Cylinder housing inner diameter
3
Piston
5
133.12-133.20
5.241-5.244
Outer diameter
1.251-1.252
31.78-31.80
Inner diameter
Piston rod
6
1.997-2.000
50.72-50.80
Outer diameter
1.249-1.250
31.72-31.75
Inner diameter
Retainer
7
2.618-2.620
66.50-66.55
Outer diameter
2.005-2.007
50,93-50.98
Inner diameter
Cylinder head
8
133.25-133.30
5.246-5.248
Outer diameter
4.770-4.774
121.16-121.26
Inner diameter
15-42
