Specifications
Mnl50005 (02-03) 9
OPERATION
WEEKLY MAINTENANCE
(Every 20 Hours of Operation)
1. Inspect vacuum hoses for holes and loose cuffs.
FOR SAFETY: When using machine, follow mixing
and handling instructions on chemical containers.
2. Inspect cord and cord grip for damage. Replace
immediately if damaged.
3. Lubricate metal shaft on recovery tank drain with
water resistant oil.
4. Run a vinegar solution of 50% vinegar and 50%
water through the system. Let sit for 15 minutes
then rinse with fresh water.
MONTHLY MAINTENANCE
(Every 80 Hours of Operation)
1. Check the oil level in the gearbox on a monthly
basis. Change the oil yearly. It is very important to
maintain the proper oil level. To check the oil
level, remove the vent plug and look into the
gearbox. Turn the “star” until the inspection hole
in the gear can be seen.
2. Set the machine so the head is sitting flat. The oil
level should go up to but not past the middle of
the gear.
3. If oil needs to be added, use quality 80-90 weight
gear oil (Figure 19). Helpful hint: When checking
the oil level in the gearbox, use a toothpick as a
dipstick. The oil level should measure 3/8” deep.
4. Remove and rinse the filter screen from the flow
control solenoid valve.
5. Change the felt seal (Figure 20). This is
recommended after every ten hours of use. (For
step by step instructions on removing the
cleaning head and seal, refer to the “Repair
Guide” section of this manual.) Always keep a
spare felt seal soaking in 30 weight oil. By
immersing the felt in oil, it will expand like a
sponge and provide sufficient seal for a good
vacuum. Place the used seal back in the oil bath
to rejuvenate. Helpful hint: An ideal container in
which to soak the spare felt seal is a commercial
tuna can. It is the right size and shape and does
not require a large amount of oil (Figure 21).
6. After placing the refreshed, oil soaked felt seal in
the hub, coat the surface with 30 weight oil.
Lightly oil the inner hub threads before
reattaching the cleaning head to the machine
(Figure 22).
7. Lubricate wheels with water resistant oil.
8. Inspect machine for water leaks and loose
hardware.
FIG. 19
FIG. 20
FIG. 21
FIG. 22