LIFT CYLINDER TEST AND AIR BLEEDING (CONT)
(Sheet 2 of 2)
Put rated capacity load on forks.
Operate vehicle through normal lift and tilt
Hydraulic oil must be at normal operating temperature,
2. Hydraulic controls
(110 -1200 F).
With load on forks, lift carriage so lift cylinder
Mast at 0 tilt.
3 . Forks
has hydraulic load.
Measure height of carriage from ground.
Carriage must not drift more than one inch in 20
Loosen but do not remove.
1. Bleed screw
System is under high pressure. Removing bleed
screw completely will cause mast and
carriage to drop suddenly.
Lift approximately 2 ft. (608 mm).
Allow to bleed through bleed screw until oil
3. Air in lift cylinder
comes out with no air.
4. Bleed screw-
Check level and fill if necessary. (See
6. Hydraulic tank
LO 10-3930-641 -12.)