10
17. Replace the dust cover using the four (4) 5/16 bolts, lock washers and flat washers. Tighten using a ½
wrench or socket.
18. Set machine upright and reinstall the vacuum hose onto the vacuum tube.
Bearing Inspection
To inspect the condition of the bearings in the large pulley it is necessary to first loosen the tension on
the belt. To do this, follow the steps 1-12 in
the “Belt Change” section.
Then tilt machine back until
resting on floor. After loosening the belt tension, move the pulley left to right to detect any movement
or play in the bearings. There should be almost no movement during this inspection. The more play, the
worse the condition of the bearings.
Bearing Replacement
This job requires a set of retaining ring plyers, safety glasses and the proper replacement bearings as
well as some general hand tools. The bearings used here are 6204 bearings with double seals. These are
available from Onfloor, part number 297623. It is very important to wear the safety glasses especially
when removing and installing the retaining rings. If you do not have retaining ring plyers they can be
purchased at Lowes, Home Depot, Harbor Freight, and other tool stores for about $30.
Once the bearings are determined to be in need of replacement, follow the steps below to remove the
pulley.
First, follow the steps in the section “Belt Changing Instructions” to remove the belt. Then follow the
steps below.
1.
With the handle in the straight up position, tilt the machine to its right side so the machine is
resting on the side of the frame and one of the wheels. This makes the machine stable and less
likely to tip over.
2.
Using a 15/16 socket with an extension, remove the nut and flat washer located in the center of
the pulley. The flat washer located behind the nut is a 16mm flat washer and not a standard SAE
type so be careful not to lose them as they may be challenging to purchase locally. Pull the
pulley straight out and away from the machine.
With the pulley removed we can proceed with bearing replacement. Look at the pulley from the back
and you will see the retaining ring that secures the bearings in place. Wearing your safety glasses and
using the retaining ring plyers remove the retaining ring.
Installation Using a Press
The best method to remove and install new bearings is to take the pulley to a hydraulic press and press
the bearings in and out. When using this method, it is important to properly support the pulley to allow
space for the old bearings to exit. This is accomplished by supporting the pulley as close to the center as
practical using 2 pieces of 2 x 4 lumber or 2 pieces of equal thickness steel. When pressing the old
bearings out it is acceptable to use almost any device as a pushing tool as long as it will fit through the
center opening without touching the pulley. This means a piece of metal tubing or rod or even a piece of
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