TM 9-2320-260-34-2
16-35. BOOM EXTENSION CYLINDER MAINTENANCE [M819) (Contd)
Repair cylinder (9), cylinder head (7), and piston rod (18) (para. 2-10). Replace unrepairable parts.
a. Remove minor rust and corrosion, scratches, and scoring with soft. stone or crocus cloth.
Replace part if pitting is uncovered when rust or corrosion is removed. Replace parts if more
severely damaged.
b. Repair broken or cracked welds and replace broken or damaged studs (8).
Install new outer O-ring (6) and new inner O-ring (5) on cylinder head (7).
1.
Position snapring (1), washer (2), new wiper ring (3), and new felt washer (4) on piston rod (18) and
2.
slide part way up piston rod (18).
Carefully work cylinder head (7) onto piston rod (18) and install new felt washer (4), and new wiper
3.
ring (3) on bore of cylinder head (7).
4.
Slide washer (2) down piston rod (18) against wiper ring (3) and install snapring (1) on cylinder
head (7).
Install expander (13), new compression cup (14), spacer (15), new compression cup (16) and
5.
expander (17) on piston rod (18) with two nuts (12).
NOTE
Z Assistant will help with steps 6 and 7.
q Coat all internal surfaces and parts with hydraulic oil before
assembly.
6.
Carefully work cylinder (9) over compression cups (16) and slide cylinder (9) onto piston rod (18).
Aline studs (8) of cylinder (9) with holes in cylinder head (7) and install cylinder head (7) on
7.
cylinder (9) with four nuts (11) and new cotter pins (10).
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