A. External Leakage
Symptoms: Oil on rod or around gland
Causes: Worn seals (90%), rod damage
Solution: Replace seal kit (1W-0530), polish/rechrome rod
B. Slow Operation
Symptoms: Delayed blade response
Causes: Contaminated fluid, pump wear
Solution: Flush system, test pump pressure (should be >200 bar at lift)
C. Jerky Movement
Symptoms: Uneven blade movement
Causes: Air in system, misalignment
Solution: Bleed system, check mounting alignment
This 1U-3990 lift cylinder is used for D6H dozer.
TRACK-TYPE TRACTOR
D6H
9T-4762
1F-6762
1U-4738
5J-8019
8C-3839
9T-3884
2H-4145
1S-0669
5J-8011
1U-4081
3J-6572
4J-0121
0S-1756
1B-4331
1U-4079
8C-3840
5J-0964
1U-4087
5H-9394
4J-6374
8T-5668
8T-3015
