WHEEL DRIVE SYSTEM 69Service Manual – Advenger, 2800ST, 3800ST, BR 755, BR 855
Replacing the Drive Tire
Replacing the drive tire (metal wheel with urethane tire) requires the tire pulling kit (56422174). The drive
tire may be replaced without removing the drive assembly from the machine, but you may nd it easier to
remove the drive wheel assembly.
1. To reduce the weight of the machine, drain both the recovery and solution tanks. To lower the center of
gravity of the machine, you may even choose to remove the recovery tank from the machine.
2. Block both sides of the machine at the rear lifting points (15) to keep the machine stable and prevent
it from rolling. To prevent tipping, it is also a good idea to
chain the machine down at the rear lifting points.
3. Raise the front of the machine by jacking at the center front
at surface of the solution tank.
4. Using a 5mm hex key, remove the four screws (38) that
secure the drive hub (40) to the internal gearbox.
5. Using a 5mm hex key, remove the six screws (39) that
secure the drive hub to the tire (wheel).
6. Insert the four wheel puller bolts (41) through the drive
housing, and hand tighten them until they equally touch the
metal wheel portion of the tire assembly.
7. Using a 5mm hex key, gradually tighten each bolt at about
1/2 to 1 turn at a time. Work in a crisscross pattern so each
bolt pushes the wheel off the main bearing (42) equally. (The
wheel hub (40) will come free after just a few turns.)
For reference, the wheel/tire presses over the main bearing (42). The drive hub (40) is lightly pressed onto
the tapered disk (43) of the gearbox.
38
39
40
41
Motor removed
for clarity.
42
43
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