Drive Tire; Remove; Install; Master Drive Unit - Yale 524150797 Maintenance Manual

0630 YRM 1503

REMOVE

WARNING
Block each side of the truck under the drive unit
frame. Position blocks on both sides of the load
wheels to prevent the truck from falling.
1. Block the lift truck so the drive tire is off the floor.
Refer to the section;
• Periodic Maintenance 8000YRM1510
for lift truck model A249
• Periodic Maintenance 8000YRM1666
for lift truck model A245
2. Turn the key switch to the OFF position and dis-
connect battery.
REMOVE
The master drive unit (MDU) has five main compo-
nents: the traction motor, brake, steering control han-
dle, drive unit, and drive tire and wheel assembly.
Separate parts of the MDU can be removed without
removing the complete MDU. It is not necessary to
perform each step of the entire procedure to remove
some parts of the MDU. The procedure has steps to
remove and disassemble the complete MDU. Read
the entire procedure first and perform only the steps
necessary to make the required repairs.
WARNING
Cleaning solvents can be flammable, toxic, and
can cause skin irritation. Wear protective gear
when handling solvents and always follow the
recommendations of the manufacturer.
WARNING
Put blocks under each side of the truck under the
MDU frame. Position blocks on both sides of the
load wheels. The blocks must prevent the lift
truck from falling and causing personal injury or
property damage.
NOTE: Insure the truck is blocked high enough to re-
move the drive unit from below the truck frame.

Drive Tire

3. Loosen and remove the five lug nuts securing the
drive tire and wheel assembly to the axle shaft.
4. Remove the drive tire and wheel assembly.

INSTALL

1. Mount the drive tire and wheel assembly on the
axle shaft.
2. Install lug nuts. Tighten lug nuts to 120 N•m (88
lbf ft).
3. Remove blocks and lower the lift truck to the floor.
Reconnect the battery.

Master Drive Unit

1. Raise the drive tire off the floor. Block the lift
truck. Refer to the section:
Always disconnect the battery connector so that
the connector is completely free before repairing
the brake system. If the connector is not com-
pletely free, it can reconnect the battery. Tag the
connector - DO NOT CONNECT.
2. Turn the key switch to the OFF position and dis-
connect the battery connector.
3. Remove the drive unit compartment cover to ac-
cess the MDU. Refer to AC Motor Repair
0620YRM1513.
4. Discharge the capacitors. Refer to Safety Precau-
tions in this section.
5. Remove the lug nuts and remove the drive tire
and wheel. See Figure 2.
• Periodic Maintenance 8000YRM1510
for lift truck model A249
• Periodic Maintenance 8000YRM1666
for lift truck model A245
WARNING
Drive Tire
3