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SERVICING (continued)
AN AUTHORIZED SERVICE CENTER SHOULD PERFORM THE FOLLOWING PROCEDURES
1. Drive belt adjustment and/or replacement: The cogged drive belt system rarely needs tightening, so if it becomes loose
from wear, it is time to replace it. Follow this procedure:
a) Remove the two screws that attach the hanger bracket to the brush shroud. Then remove the thru-bolt from the
brush chassis and lift handle. Remove the lift handle and lift stop.
b) Tilt the machine backward allowing it to balance on the wheels and drain valve. The brush chassis will remain on the
floor exposing the brush drive belt and motor.
c) Loosen the two motor bracket mounting bolts with a 7/16" wrench. DO NOT REMOVE THE BOLTS UNLESS YOU ARE
REPLACING THE MOTOR. Slide the motor away from the brush to tighetn the belt of toward the brush for removal.
Unlike a "V" type belt, the cogged belt is run with basically zero deflection. To test the belt tension, hold the belt
between your thumb and forefinger and twist to the side. It should turn approximately 900 with little effort. If it
twists more than 900, retighten the belt.
2. Pump Replacement:
a) Remove the lift stop handle as described in "drive belt adjustment/replacement" procedure in 1a.
b) Tilt the machine backward as described in "drive belt adjustment/replacement" procedure in 1b.
c) Disconnect the black wire (#2) and the white wire from the bridge rectifier. Also, disconnect the ground wire (this
will need to be respliced and reconnected to the ground wire on the brush motor when reassembling). Reference
the electrical schematic.
d) Remove the two hoses from the pump. It is now fully exposed for replacement.
e) When reassembling after any repairs, make certain that all wire connections are properly plugged in and secure.
f) Reattach hoses and make sure all solution hoses connections are secure.
3. Vacuum Motor Replacement:
a) Remove the dome top and carefully turn the machine upside down.
b) Remove the two hex bolts at the base of the black panel on the back of the machine.
c) Remove the wheels in order to get at the hex bolts in step (d). Shoulder bolts hold the wheels on.
d) Then remove the six hex head bolts on both sides of the vacuum motor chassis.
e) Disconnect the two power leads and the ground wire coming through the back of the machine to the vacuum motor.
f) Tip the vacuum motor and brush chassis away from the machine and carefully feed the vacuum hose down through
the back of the machine.
g) Then remove the three (3) bolts that hold the bracket for the vacuum motor. Remove the bracket.
h) Release the vacuum motor from the bracket by removing the three bolts which hold them together.
i) The vacuum motor can now be removed.
j) When reassembling after any repairs, make certain that all wire connections are properly plugged in and secure.
k) Avoid abrasive contact with sharp edges on the metal parts as injury can result.
l) Make sure all vacuum hose connections and wire connections are secure.
SERVICING
6
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