Minuteman 747 Wide Area Carpet Vacuum - Manual (Page 7)

Parts and Instruction Manual
Page 4
Maintenance
a) Keep filter bag clean.
b) A drop of number 30 oil should be applied to the caster bearings and main wheel axles, two or so
times a year.
c) To replace brush, remove brush drive belt from motor pulley by rotating motor shaft by hand and
pulling outwardly on belt. Then, tip machine over on its top or side (hold motor mount assembly
in position when tipping or turning over); remove the sheet metal guard covering the brush
pulley. Use two small wrenches to simultaneously remove brush axle screws on each side of
frame, and slip brush out of brush cavity. Remove screws, axle, pulley and bearing end caps
from brush.
NOTE: Inspect and replace the brush bearing, if necessary, at the time of reassembly. When remounting
end caps be sure to press them squarely into the machined brush ends. Note: Be sure to line up
holes in caps and brush before pushing caps all the way into the brush core. After caps are lined up
and pressed in squarely, tighten cap screws securely. All parts can now be reassembled. Turn both
axle screws in brush axle at the same time for ease of installation. Also, be sure brush belt is on brush
before putting brush in brush cavity. After brush axle screws are securely tightened, line up belt on
brush pulley and then work the other end of the belt for tightness - it should be snugly tight, not taught.
Adjust tightness, when necessary, by adjusting screw heights on front of motor mount platform. Check
for tightness on fan belt also. If this belt is too loose, move motor toward front of machine by loosening
motor mount screws and sliding motor on forward. Be sure motor is at right angles (square) with
belts, then tighten mount screws. Recheck tightness of brush belt - adjust again, if necessary.
Reassemble other parts and unit is ready for use.
d) When the filter bag is removed for cleaning (or replacement) be sure unit is disconnected from
power source. It is good policy to inspect the fan to see if it has become fouled with debris such
as string, wire and so forth.
e) Periodically inspect the brush to determine whether it has become fouled with string, wire or
similar debris.