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TM 5-2420-222-34
10-4.
HYDRAULIC BRAKE CYLINDER MAINTENANCE (Con’t).
b.
DISASSEMBLY
1.
Remove bushing (11) and preformed packing (10) from hydraulic cylinder (3). Turn hydraulic cylinder over and
drain hydraulic fluid into drain pan.
2.
Remove preformed packing (10) from bushing (11). Discard preformed packing.
3.
Remove elbow (6) and preformed packing (31) from check valve seat (30). Discard preformed packing.
4.
Remove elbow (8) and preformed packing (32) from check valve seat (33). Discard preformed packing.
5.
Remove check valve seat (30) and preformed packing (29) from hydraulic cylinder (3). Discard preformed
packing.
6.
Turn hydraulic cylinder (3) on end and remove spring (28), ball bearing (27), and retainer (26).
7.
Remove check valve seat (33) and preformed packing (34) from hydraulic cylinder (3). Discard preformed
packing.
8.
Turn hydraulic cylinder (3) on end and remove spring (35), ball bearing (36), and retainer (37).
9.
Push two pistons (24) and springs (25) out from pedal side of hydraulic cylinder (3).
10.
Remove two oil seals (19) and preformed packings (18) from hydraulic cylinder (3). Discard oil seals and
performed packing.
11.
Remove bushing (12) and preformed packing (13) from hydraulic cylinder (3). Discard preformed packing.
12.
Remove two check valves and springs (14), preformed packings (15), check valve disks (1 6), and springs (17)
from hydraulic cylinder (3). Discard preformed packings.
13.
Remove two drain plugs (23), preformed packings (22), springs (21), and ball bearings (20) from hydraulic cylinder
(3). Discard preformed packings.
14.
Remove pipe plug (38) from hydraulic cylinder (3).
c.
CLEANING AND INSPECTION
WARNING
Dry cleaning solvent, P-D-680, is toxic and flammable. Always wear protective
goggles and gloves, and use only in a well-ventilated area. Avoid contact with skin,
eyes, and clothes, and DO NOT breathe vapors. DO NOT use near open flame or
excessive heat. The solvent’s flash point is 1000F-1380F (380C-590C). If you
become dizzy while using cleaning solvent, Immediately get fresh air and medical
help. If solvent contacts eyes, Immediately wash your eyes and get medical aid.
1.
Clean all metal parts with rags and dry cleaning solvent. Dry thoroughly with clean, dry rags.
2.
Inspect all metal parts for cracks, breaks, and abnormal bends.
3.
Inspect hydraulic cylinder for scoring, wear, cracks in hydraulic cylinder bores, and damage to ball seats.
4.
Inspect all threaded parts for damaged threads.
10-22
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