7
MN914
Maintenance
WARNING:
Prevent electrical shock hazard and accidental machine operation. Always disconnect
grinder-buffer from the power source before servicing, changing accessories (such as
wheels, tool rest, spark arrestor, etc.) or before performing maintenance.
Replace worn wire brush wheel as necessary. The wheel should be replaced after the
diameter is reduced by 1 or 2 inches from original size. When replacing a worn wheel,
remove all dust and other materials from wheel guard.
Motor and pulley bearings are lubricated for life and do not require additional lubrication.
Replacement wheels may be purchased directly from your local industrial supply dealers,
abrasive dealers, tool dealers, etc.
Remove grinding dust from exhaust ports to prevent accumulation.
Replace damaged parts immediately to maintain safety of machine.
Figure 4 Belt Adjustments
Tracking
Lever
1/4” (6mm)
Top Bolt
Top Plate
Tracking Lever
Top Bolt
Top Plate
Catch
Idler
Platen
Idler Pulley
Drive Pulley
Abrasive Disc
Tracking Adjustment
see Figure 4
Always ensure belt entirely covers rubber Drive Pulley. Adjustment is made when running or
when belt rotated by hand. To adjust left, move tracking lever down. To adjust right, move
lever up. If tracking lever is set fully in up or down position, coarse tracking adjustment must
be made.
Coarse Tracking
1.
Set Tracking Lever in the mid position so it is horizontal.
2.
If belt was changed, release the catch so spring loaded idler pulley is in full contact with
belt. Manually rotate belt a few times and observe the position of the belt.
3.
If belt wanders toward the disc, loosen Top Bolt slightly and tap Top Plate a small
amount toward the grinder. If belt wanders toward the grinder, loosen Top Bolt slightly
and tap Top Plate a small amount toward the disc.
4.
When belt runs evenly on drive pulley and idler pulley, tighten the Top Bolt.
5.
Put on full face shield.
6.
Place the On-Off switch in the On position. Grinder-buffer should come up to speed
smoothly and without vibration. If grinder-buffer does not, shut grinder-buffer off
immediately and determine reason.
7.
Verify the belt runs evenly on drive pulley and idler pulley.
8.
Place the On-Off switch in the Off position when done.
Fine Tracking
The Tracking Lever is used for the final fine adjustment.
1.
Move Tracking Lever slightly Down to move belt left on the platen or Up to move belt
right on the platen.
2.
Move Tracking Lever slightly Up or Down as needed to obtain
1
/
4
″
(6mm) clearance
between Disc and Top Plate.
