TM 10-3930-641-34
LIFT CYLINDER TEST AND AIR BLEEDING (CONT)
(Sheet 2 of 2)
LOCATION/ITEM
ACTION
REMARKS
Put rated capacity load on forks.
1. Vehicle
Operate vehicle through normal lift and tilt
Hydraulic oil must be at normal operating temperature,
2. Hydraulic controls
(110 -1200 F).
cycle.
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
4. Carriage
minutes.
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).
2. Carriage
Allow to bleed through bleed screw until oil
3. Air in lift cylinder
comes out with no air.
4. Bleed screw-
Tighten.
Lower completely.
5. Mast
Check level and fill if necessary. (See
6. Hydraulic tank
TA 172226
LO 10-3930-641 -12.)
End