General; Description Of Operation; Load Wheel; Remove - Yale 524150797 Maintenance Manual

4000 YRM 1509
This section contains the description, repair, and
adjustment procedures for the lifting mechanisms
installed on the MP20MP035-D, MP045VG lift truck.
For troubleshooting and repairs on the electrical
components see Electrical System 2200YRM1508.
See AC Motor Controller 2200YRM1507 for
controller functions.
The lifting mechanism consists of:
• Lift cylinder, 1 each
• Rocker arm, 1 each
• Pull rods, 2 each
• Load wheel assemblies, 2 each
• Rear links (wheel support), 2 each
The lifting mechanism connects the main frame to the
fork frame. The lift cylinder and rocker arms are parts
that connect the main frame to the fork frame. The
pull rods are installed between the rocker arm and the
load wheel assemblies.

REMOVE

1. Move the lift truck to a safe and level area.
2. Use the lift button to raise the lift truck to its maxi-
mum height.
3. Put blocks under both forks and on both side
(front and back) of the drive tire to prevent move-
ment of the lift truck. See the section
• Periodic Maintenance 8000YRM1510
for lift truck model A249
• Periodic Maintenance 8000YRM1666
for lift truck model A245
4. Press the lower button to relieve pressure from
the hydraulic system.
5. Turn the key switch to the OFF position and dis-
connect the battery.

General

Description of Operation

Load Wheel

For troubleshooting and repairs on the hydraulic
components, see Hydraulic System 1900YRM1506.
The lifting mechanism is operated by the lift pump and
motor assembly. When the lift button on the control
handle is depressed, the lift pump sends hydraulic
fluid to the lift cylinder. The lift cylinder extends, lifting
the fork frame. This action operates the rocker arm,
which move the pull rods forward in the direction of
the drive motor. The movement of the pull rods cause
the rear links and load wheels to pivot down, lifting the
rear of the fork frame. This helps lift the fork frame
and keep the forks parallel with the ground.
NOTE: The lift linkage is not adjustable.
6. Unscrew the axle capscrew. Remove the load
wheel with bushings, bearings, and the spacer.
See Figure 1 or Figure 2.
7. Remove the bushings from each end of the load
wheel.
8. Remove the bearings from each end of the load
wheel. It may be necessary to use a brass drift
punch to drive the bearings out of the load wheel.
9. Remove the spacer from the inside the load
wheel.
10. Remove all old lubricant from the load wheel.
Clean and inspect all parts. Replace all defective
parts as necessary.
General
1