TM 5-2420-224-20-2
FORKLIFT LIFT CYLINDER BLEEDING (CONT)
1.
2.
3.
4.
5.
6.
7.
8.
9.
With no load on forks, extend and retract mast through one complete cycle.
With mast fully lowered, check front hydraulic tank and top off as necessary (LO 5-2420-224-12).
Raise and retract mast completely at least four more times. This will force air in system to lift cylinder
center cavity under bleeder valve (1).
Raise carriage assembly approximately 10 in. (25.4 cm) off ground.
Slide tubing through hex tube wrench and onto bleeder valve (1) located on top of lift cylinder
crosshead (2). Place other end of tubing in suitable container to catch oil.
Open bleeder valve (1) no more than l/4-turn with hex tube wrench. Weight of carriage assembly will
force air and hydraulic oil out of lift cylinder through bleeder valve (1).
If carriage assembly reaches bottom of its travel before all air is bled, close bleeder valve (1) and
repeat steps 4 thru 6.
When oil stream no longer contains air bubbles, close bleeder valve (1) and tighten to 25-27 Ib-ft
(44.9-46.6 N.m).
Fill front hydraulic tank (LO 5-2420-224-12).
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