MAINTENANCE
8400D MM312 (2–94)
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7. Insert the side brush retaining pin through
the side brush hub and shaft.
8. Secure the pin by clipping the pin keeper
over the end of the pin.
9. Disengage the hopper support bar and lower
the hopper.
10. Adjust the side brush pattern with the side
brush down pressure knob.
SIDE BRUSH GUARD
Rotate the side brush guard 90
every 200 hours
of operation. Replace the brush guard after all
four sides have been used.
SCRUB BRUSHES
Three disc-type scrub brushes scrub the floor. A
spring lock clip holds the scrub brush onto the
drive hub.
The scrub brushes should be checked daily for
tangled wire or string, wear, and damage. The
brushes should be replaced if large portions of the
brush bristles are missing or if the remaining
brush bristle measure 0.25 in (6 mm) or less in
length.
NOTE: Be sure to replace the scrub brushes in
sets. Otherwise one scrub brush will be more
aggressive than the other.
REPLACING THE SCRUB BRUSHES
1. Set the machine parking brake.
2. Raise the scrub brushes.
3. Stop the engine.
FOR SAFETY: Before leaving or
servicing machine; stop on level
surface, set parking brake, turn off
machine and remove key.
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