Specifications

7500 SERVICING BEARINGS

Replacing Cutter Wheel Bearings

• Loosen the setscrews in the locking collars of

the bearings. You may need to heat bearing

collar to loosen the LocTite that was used

during assembly.

• To remove the bearings from the cutter wheel

shaft, use a steel hammer to strike the bearing

housing until it cracks and breaks apart. Then

use a torch to cut the bearing race off the shaft.

Be very careful not to cut into the cutter wheel

shaft with the torch. Allow the shaft to cool

completely before starting to reassemble the

new bearings.

• Replace new bearings making sure the lock

collars on the bearings are facing inward toward

the cutter wheel.

• There are two setscrews in each bearing lock

collar. Tighten one setscrew in each collar and

remove the other setscrew. Punch a start point

in the shaft and drill 3/8” diameter hole in cutter

wheel shaft just deep enough for setscrew to

enter shaft. Take care not to damage the

screw threads. Replace setscrew with LocTite

242 and tighten. Do this for all four setscrews.

This will help prevent shaft from spinning and

walking inside of bearing.

• Note: if you are only replacing the bearings and

not the cutter wheel shaft, you do not have to

drill the points into the shaft. Just make sure to

line the holes in the collar up with the holes in

the cutter wheel shaft.

• Bolt bearings and cutter wheel back to boom

box. Tighten the bolts. There are two nuts on

each bolt.

BEARING COLLARS FACING IN