Milnor 42031, Руководство по обслуживанию, Страница: 14 / 42

SECTION 8
CLUTCH, BRAKE AND DRIVE
The clutch is essentially a tubeless tire which may be automatically inflated by air. The tire is mounted
on the reducer shaft and nests into a hollow portion of the main drive pulley which is much like an
automobile brake drum. When the tire is inflated, it expands outwardly and grips the inside of the
drum, thus transmitting power from the gear reducer to the washer shaft. When the air is released, the
tire automatically reverts to its normal size, thus becoming disengaged from the main pulley so that the
machine may be run at Extract Speed without over speeding the helical gear unit. During washing and
inching, the cylinder is driven by the Wash Speed motor through the gear reducer and the clutch, while
the Drain Speed motor and the Extract motor merely coast. As soon as the drain Valve opens, the
Wash Speed motor is shut off and coasts with the Extract motor, while the Drain Speed motor drives
the cylinder through the reducer and clutch. During extraction, both the Wash Speed and Drain Speed
motors are shut off, the clutch disengaged, and the Extract motor drives the cylinder through the
Extract motor “V” belt drive. At the expiration of extraction, the Extract motor is shut off, the brake
applied, and either the Drain Speed or Wash Speed motor (depending upon whether the Drain Valve is
open or closed) starts and runs idle while the brake decelerates the machine. When the machine has
slowed down sufficiently to actuate the centrifugal switch, the brake is automatically released, and the
clutch engaged thus returning the machine to the Wash cycle or Drain Speed.
Air controlled by a solenoid valve and the MILTROL is admitted to the clutch through a drilled hole in
the center of the reducer shaft. The air is prevented from entering the reducer housing itself by a
mechanical end face seal which is in the air inlet on the reducer. The reducer is additionally fitted with
a vented fill plug to prevent build up of air pressure in the housing should the mechanical seal fail.
Absolutely no clutch adjustment is necessary in the field. Except for the fact that the air supplied to
the unit must be reasonable free of oil and moisture, there is otherwise no field clutch maintenance
necessary.
NOTE: IF THE MACHINE SHOULD MAKE A LOUD SCREECHING SOUND LIKE SKIDDING
AUTOMOBILE TIRES DURING DECELERATION FROM EXTRACT SPEED TO WASH SPEED,
TURN MASTER SWITCH TO “OFF” IMMEDIATELY AND SEE TROUBLE SHOOTING
SECTION.
A quick release valve permits instant clutch release by providing a large area “short circuit” exhaust
connection near the clutch. The quick release valve is necessary for the clutch used on washer-
extractors, and is furnished as original equipment.
The brake band is applied to a portion of the outside of the Combination-Brake drum pulley. The
brake is normally on, and braking pressure is supplied by the action of springs inside the brake air
cylinder. The brake is released when air is admitted to the top of the air cylinder. Brake may be
readily adjusted to compensate for wear by adjusting nuts on the air cylinder stem.
Litho in U.S.A. 1M 246/70023