Specifications

Vehicle System Testing & Adjusting 58
Standard Lift Cylinder Air Removal
After the standard lift cylinder has been disassembled
and then assembled again, it may be necessary to
remove the air (bleed) from the cylinder.
1. With no load, lift and lower the mast and carriage
through one complete cycle.
2. With the forks on the floor, check the oil level in
the hydraulic tank. Add oil (if necessary) to bring
the oil level to the full mark.
3. With no load, lift and lower the mast and carriage
again through four complete cycles.
The oil will have high pressure present. To
prevent personal injury, do not remove the
bleed screws completely. Keep hands and feet
away from any parts of the truck that move,
because the forks will lower when the bleed
screw is loosened.
4. Lift the forks high enough to put a load on all
stages of the lift cylinders.
Setscrew Locations
(Standard Cylinders)
NOTE: The Standard Lift mast has two secondary
cylinders and no primary cylinders. The Full
Free Triple Lift mast has one primary and two
secondary cylinders.
5. Locate the setscrew on each lift cylinder. Slowly
open setscrews no more than one turn. The
weight of the carriage will force air and hydraulic
oil out of the cylinders through the setscrews.
Close the setscrews before all the pressure is out
of the cylinders. This will prevent air from
entering through the setscrews.
6. Repeat Steps 4 and 5 until there are no air
bubbles at the setscrews.
7. After all the air is removed, tighten the setscrews
to a torque of 5 to 7 N·m (45 to 60 lb·in).
8. Fill the hydraulic tank to the full mark.
9. Lift and lower the mast and carriage again
through one complete cycle. If the mast does not
operate smoothly, repeat Steps 3 through 9.
WARNING