TM 9-2320-260-34
16-33. BOOM LIFT CYLINDER MAINTENANCE (M819) (Cont'd)
NOTE
Coat all internal surfaces and parts with lubricating oil before assembly.
Coat bushings and pivot pins with light coat GM grease before assembly.
1. Install grease fitting (8) in piston rod trunnion (7).
2. Install new seals (9), (10), and (12) in cylinder head (11). Slide cylinder head (11) on piston rod (6).
3. Install new seals (14) and (15) on piston (13). Ensure seal (14) is not rolled in groove on piston (13).
4. Install piston (13) on piston rod (6) with nut (16) and new cotter pin (17).
5. Carefully slide piston (13) and piston rod (6) into lift cylinder (2).
6. Aline cylinder head port(4) with lift cylinder port (1) and slide cylinder head (1) down piston
rod (6) and over studs (3).
7. Install cylinder head (11) on lift cylinder (2) with twelve nuts (5). Tighten nuts (5) evenly in star
pattern.
f. Installation
Perform step 1 if boom was not removed.
1.
Raise and support boom (20) (TM 9-2320-260-10).
2.
Attach chains to lift cylinder (2) and lifting device.
WARNING
All personnel must stand clear during lifting operations.
A swinging or shifting load may cause injury to personnel.
Ensure lifting capacity is greater than weight of boom lift
cylinder. Failure to do so may result in injury to personnel or
damage t.o equipment.
NOTE
Assistant will help with steps 3 through 9.
Move lift cylinder (2) into position in boom support (21). Aline lift cylinder port (1) and cylinder head
3.
port (4) to the right.
4.
Aline lower trunnion of lift cylinder (2) with pivot pin bores (32).
Install lift cylinder (2) on boom support (21) with lower pivot pin (31) and new cotter pin (33).
5.
Install grease fitting (30) in lower pivot pin (31).
6.
Manually extend piston rod (6) and aline trunnion (7) with pivot pin bores (19) in boom (20).
7.
Install piston rod trunnion (7) on boom (20) with pivot pin (22). Ensure setscrew notches in
8.
pivot pin (22) aline with setscrew holes in boom trunnions (18).
Install two setscrews (34) and jamnuts (35) in boom trunnions (18) and tighten jamnuts (35).
9.
10.
Remove chain from lift cylinder (2) and lifting device.
11.
Install nipple (29), elbow (28), nipple (27), and elbow (26) in lift cylinder port (1).
12.
Install nipple (23) and elbow (24) in cylinder head port (4).
Install hose (25) on elbow (24) and tube (36).
13.
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