Maintenance Of Machine 6 - Minuteman 380 Operation Service Parts Care

MAINTENANCE OF MACHINE
VACUUM MOTOR
Motor brushes can be replaced with Brush Set, Part No. 741008. Brushes should be replaced only
once. More than once brush replacement will cause very high current consumption. This undue cur-
rent consumption lowers overall machine performance and is not in the best interest of economical
machine use.
CARBON BRUSHES IN DRIVE MOTOR
Inspect these brushes once every 18 months or 720 hours.
The brushes can now be inspected by removing the brush caps near the end of the drive motor.
Examine all four brush lengths; if the back end of a brush is even with the edge of the brush holder or
shorter, the brush must be replaced. Replace with Brush Set, Part No. 744155. When installing new
brushes, also inspect cummutator for pits and/or excessive wear. If it is in poor condition, replace
drive motor with Part No. 744154.
CARBON BRUSHES IN BRUSH DRIVE MOTORS
Inspect these brushes once every six months or 360 hours.
Remove scrub head assembly. Examine brush lengths; if the back end of brush is even with the edge
of the brush holder or shorter, the brush must be replaced. Replace with Part No. 833474. When
installing new brushes, also inspect commutator for pits and/or excessive wear. Replace motor with
Part No. 742714 if commutator is in poor condition.
LUBRICATION
1. Grease casters once every week (two fittings per caster) or 15 hours.
2. Oil all moving parts such as hinges and pressure points once every month or every 60 hours.
SQUEEGEE RUBBERS
When the thick rear squeegee rubber is damaged or worn excessively, it will cause streaking and
poor solution pickup. Extended rubber life and be obtained by reversing it, provided it is not torn or
otherwise damaged. Do not tighten screws so tightly that squeegee rubbers are made to bulge and
show an uneven edge.
TANKS
At the end of a day's work (or work cycle, both the vacuum and solution tanks should be drained and
flushed with warm water.
Once a week for 15 hours the vacuum tank should be cleaned of settled debris. This can be done by
lowering the drain hose and washing out the debris.
BATTERIES (956720, 956740)
Periodically remove batteries from machine. Clean batteries, battery tray, and battery compartment
with a solution of baking soda and water. Check all battery cables and wiring for signs of damage or
wear. Replace as needed. Check battery fluid level each charge. Check electrolyte with hydrometer
every 15 hours.
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