TM 9-2320-260-34-2
16-14. BOOM ELEVATING CYLINDERS MAINTENANCE (M816) (Contd)
NOTE
Record position of check valve and elbow for installation.
Remove elbow (7) and check valve (8) from cylinder housing (6).
1.
Remove two grease fittings (4) from cylinder housing trunnion (9) and piston rod trunnion (5).
2.
Using spanner wrench, remove cylinder head (2) piston rod (3), and piston (1) from cylinder
3.
housing (6).
Install piston rod (3) in vise.
4.
Remove safety wire (10) from piston rod (3) and nut (11). Discard safety wire (10).
5.
Remove nut (11), washer (12), retainer washer (13), piston (1), and packing (16) from piston rod (3).
6.
Discard packing (16).
Remove two piston rings (15) and cup seal (14) from piston (1). Discard piston rings (15) and cup
7.
seal (14).
Remove cylinder head (2) from piston rod (3).
8.
Using spanner wrench, remove packing nut (21) from cylinder head (2).
9.
Remove seal (22) from packing nut (21). Discard seal (22).
10.
Remove piston rod packing (20) and packing (18) from cylinder head (2). Discard piston rod
11.
packing (20) and packing (18).
Using arbor press, remove bearing sleeve (19) from cylinder head (2). Discard bearing sleeve (19).
12.
13.
Remove piston rod (3) from vise.
c. Cleaning and Inspection
1.
For general cleaning instructions, refer to para. 2-8.
2.
For general inspection instructions, refer to para. 2-9.
Inspect piston rod (3) for bends, burrs, scratches, and damaged threads. Repair damaged threads.
3.
Replace piston rod (3) if bent, burred, or scratched.
Inspect two bushings (17) in piston rod trunnion (5) for nicks, scratches, cracks, and wear. Measure
4.
inside diameter of bushing(s) (17). If nicked, scratched, cracked, or inside diameter exceeds
1.5030 in. (38. 18mm), replace bushing(s) (17).
Inspect piston (1) for nicks, burrs, and scratches. Replace piston (1) if nicked, burred, or scratched.
5.
Inspect cylinder housing (6) for cracks or scoring. Replace cylinder housing (6) if cracked, scored, or
6.
threads are damaged.
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