TM 9-2320-260-34-2
15-59. LIFTGATE CYLINDER MAINTENANCE (M820A2)
THIS TASK COVERS:
d. Assembly
a. Removal
e. Installation
b. Disassembly
c. Cleaning and Inspection
INITIAL SETUP
MATERIALS/PARTS (Contd)
APPLICABLE MODELS
Bushing (Appendix D, Item 7)
M820A2
Lubricating oil (Appendix C, Item 21)
TOOLS
REFERENCES (TM)
General mechanic's tool kit
LO 9-2320-260-12
(Appendix B, Item 1)
TM 9-2320-260-10
Arbor press (Appendix B, Item 7)
TM 9-2320-260-34P-2
Vise (Appendix B, Item 38)
EQUIPMENT CONDITION
MATERIALS/PARTS
Parking brake set (TM 9-2320-260-10).
Two pins (Appendix D, Item 318)
Liftgate lowered to ground level
Two cotter pins (Appendix D, Item 33)
O-ring (Appendix D, Item 275)
(TM 9-2320-260-10).
Drain hydraulic system (LO 9-2320-260-12).
O-ring (Appendix D, Item 277)
O-ring (Appendix D, Item 279)
SPECIAL ENVIRONMENTAL CONDITIONS
O-ring (Appendix D, Item 281)
Perform this task in clean, dust-free area.
Seal (Appendix D, Item 414)
Seal (Appendix D, Item 417)
1. Remove hydraulic tubing (12) and (13) from adapter (11) and fluid restrictor (14).
2. Remove adapter (11), elbow (10), and nipple (9) from liftgate cylinder (3).
3. Remove fluid restrictor (14) from liftgate cylinder (3).
4. Remove two pins (1) and straight pin (8) from liftgate cylinder (3) and main frame (2). Discard pins (1).
5. Remove two cotter pins (5) and straight pin (7) from piston rod (4) and lift frame (6). Discard cotter
pins (5).
6. Remove liftgate cylinder (3) from main frame (2).
b. Disassembly
CAUTION
Perform this task in a clean, dust-free area. Failure to do so may
result in damage to equipment.
1.
With liftgate cylinder (3) positioned vertically in vise, loosen setscrew (15) and remove retaining
nut (17) and piston rod (4) from liftgate cylinder (3).
2.
With piston rod (4) positioned vertically in vise, remove nut (27), piston (25), and front head (20)
from piston rod (4).
Remove setscrew (15) and grommet (16) from retaining nut (17).
3.
Remove O-ring (24) and seal (23) from piston (25). Discard O-ring (24) and seal (23).
4.
Remove O-ring (18), seal (19), and O-rings (21) and (22) from front head (20). Discard
5.
O-rings (18), (21), (22), and seal (19).
Remove two grease fittings (26) from liftgate cylinder (3).
6.
7,
Using arbor press, remove bushing (28) from piston rod (4). Discard bushing (28).
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