Prochem SP500 POLARIS 500 Operating & Maintenance Instructions page 14

BRUSH DRIVE BELT
SERVICE / REPLACEMENT
1. Remove (2) ¼-20 hex screws attaching lower
frame to upper frame. On models 800 and
1200, remove (4) 8-32 screws on the sides of
the brush chamber cover.
2. Remove (2) spring cover plate assemblies and
carefully remove springs from the slide blocks.
3. Loosen (2) ¼-20 hex screws that hold brush
motor bracket in place. Push bracket toward
front of machine to loosen belt.
4. Remove right open-end and left pulley-end
cover plates.
5. Slide brush assembly and slide blocks out from
their guides. Replace worn and defective belt.
6. Re-install above components. Clean
accumulated lint or debris inside the slide block
guides and check for wear on the Teflon®
surfaces. Replace if necessary.
Polaris & Supernova Manual.doc 1/1/12
The slide block washer (Item 36) must be
installed between the slide block guide and
inside the divider wall. Adjust belt tension by
moving motor bracket toward the rear. Apply
minimum belt tension when the hex bolts are
tightened to allow for a smooth vertical brush
movement. If the belt is too loose it will skip
when brush is applied on the carpet. If the belt
is too tight it won't allow for correct up and
down movement.
BRUSH ASSEMBLY / BEARINGS
SERVICE / REPLACEMENT
1. Repeat steps 1 to 4 above
2. Remove slide blocks from the ends of the
brush shaft.
3. Remove (4) screws from the string guard. Tap
the shaft toward the right open end to remove
the bearing.
4. Remove (4) screws from slinger and pull off
brush core. Scrape off old sealant build-up on
the slinger and string guard. It is advisable to
replace the two bearings every time the brush
is replaced.
5. Re-install the above components.
CAUTION! Install shorter step on the shaft
ends toward the left pulley side. Apply silicone
sealant onto the ends of the brush core before
re-assembling the slinger and string guard.
Page 14 of 45