4-8.3 Lift Cylinder Removal; 4-8.4 Lift Cylinder Repair - Big Joe PPT 45 Series Operation, Maintenance, Repair Parts

4-8.3 Lift Cylinder Removal.

1. Disconnect batteries.
2. Lift complete truck to height sufficient to permit
access to under side of hydraulic cylinder (1,
Figure 4-31). Provide blocking under power section
frame and at tips of forks.
3. Remove hydraulic supply line (2). Plug open end
of hydraulic line to prevent fluid loss.
NOTE: The cylinder may have some hydraulic oil
in it.
4. Remove screw from the lower cylinder support.
NOTE: This screw is reached from below.
5. Remove upper keeper pin.
6. Remove cylinder.
7. Install new cylinder by reversing Steps 3 - 5.
IMPORTANT
When reinstalling the hydraulic supply line make
sure that it does not touch the electrical stand-off or
any other component that could cause wear and
premature failure.
PPT0104-901336
5
6
7
Figure 4-33. Lift Cylinder Assembly

4-8.4 Lift Cylinder Repair.

To rebuild or replace components in a lift cylinder,
proceed as follows:
1. Secure the lift cylinder in a vise, clamping lightly at
the base of the cylinder.
2. With spanner wrench, remove the cylinder head (2,
Figure 4-33) from the cylinder weldment (7).
3. Withdraw the cylinder rod (3) from the cylinder
NOTE: If the cylinder weldment (7), cylinder rod
(3), or cylinder head (2) is damaged, the
entire lift cylinder must be replaced.
4. Replace all wipers, seals and damaged or worn
pads (1, 4, 5, 6).
5. Coat all parts with the correct hydraulic oil (Table 3-3).
6. Insert cylinder rod (3), with attached pads, wipers
and seals into the cylinder weldment (7).
7. Install cylinder head and tighten to 5-7 lbs/ft.
3
4
1
2
I-7061
4-29