Instruction manual

To replace the jackshaft, reassemble all components in reverse order of their removal. Make certain that the
jackshaft is properly oriented with the clutch end of the shaft to the front of the machine and that all shims are
returned to their original positions. Install all jackshaft mounting bolts hand tight. Lift each end of the jackshaft with
a pry bar (one end at a time) then tighten the bolts on that end, so that the jackshaft will sit as high as possible in the
housing. This will provide for greater clearance between the clutch pulley and the drive base for the belts and easier
alignment of the jackshaft. When tightening the bolts, tighten first the bolts that secure the jackshaft to the mounting
plate, then those that secure the mounting plate to the housing. Remember that all components such as motors,
gear reducers, brakes, etc., must be properly adjusted, using the alignment procedures explained herein.
ÊBrake Assembly
ËConcept of Operation
—On 42" and 48" Hydro-cushion
®
machines, the brake is located on the drive base.
(The clutch drum is also the brake drum.) On 60" and 72" Staph-guard
®
machines, the brake is located on the
idlershaft. On all other 52", 60", 64", and 72" machines, it is located on the cylinder shaft (thus, the main drive
pulley and brake drum are combined). Machines covered by these instructions use spring loaded air cylinders to
hold the brake band against the drum. Open-pocket machines use only one level of braking (“first brake”) and
divided cylinder machines (WE’s and SG’s) use two levels (“first” and “second” brake). The “first” brake is nor-
mally on, and braking pressure is supplied by the action of the springs inside the brake air cylinder. The “first” brake
is released by applying air to the top of the air cylinder to counteract the springs. This occurs whenever the cylinder
rotates under power. On divided cylinder machines, the “second” brake which is on whenever the cylinder is at rest
with the door open, supplements the “first” brake with air pressure applied to the back of the air cylinder.
ËBrake Assembly Maintenance
—For identification of brake components and specific adjustment proce-
dures refer to the Brake Assembly, Drive Assembly and/or Brake Air Cylinder drawings for your machine. Specific
adjustment procedures are also found on the Brake Assembly drawing for your machine.
The brake may be readily adjusted to compensate for wear by adjusting the nuts on the air cylinder stem. If
brake components must be removed or repaired, it is essential to adjust the brake upon replacement in accordance
with the Brake Assembly drawing.
NOTE: For any adjustment procedure requiring air pressure to the brake, do not attempt to perform this
procedure by energizing the washer as it is not possible to release the “first” brake without the cylinder
rotating under power.
To release the “first” brake without energizing the washer:
1. Disconnect the internal air line to the air cylinder. (This is the only air line to the air cylinder on open-pocket
machines and the air line closest to the air cylinder stem on divided cylinder machines.)
2. Temporarily connect a direct air line to the air cylinder where the internal line was removed and apply air to
release the brake.
3. On divided cylinder machines, make sure the doors are closed (to release the “second” brake).
ÊCentrifugal Switch
ËConcept of Operation
—After an extraction, the centrifugal switch will signal the Miltrol as soon as the
washer cylinder has slowed sufficiently to permit the wash speed clutch to re-engage. Also, until this low speed has
been attained, the Miltrol circuits prevent the opening of the shell door, thus providing safety interlocking.
This centrifugal switch assembly consists of three mercury tube switches wired in parallel, and connected to
two copper rings. The shaft of the centrifugal switch is driven by the extract motor shaft and rotates at the same
speed as the extract motor. At a predetermined speed, centrifugal force will cause the mercury switches to open the
circuit. At lower speeds, there is always at least one switch closed, thus maintaining the circuit continuity. Two
spring loaded carbon brushes, riding on the copper contact rings, transmit this electrical signal to the Miltrol.
This electrical signal is used to energize the speed relay at the expiration of extraction, when the predetermined
reclutching speed has been reached. The combined operation of the extract relay and the speed relay in the Miltrol
perform all the functions of operating the brake, clutch, and extract motors incidental to the automatic entrance into
extraction, and subsequent return to wash speed.
ËCentrifugal Switch Maintenance
—See Centrifugal Switch Assembly for your machine for identification
of switch components.
The centrifugal switch is very simple, yet of vital importance. Failure of one of the mercury switches to make
contact, an irregular contact between the brushes and the contact rings, a loose connection in the wiring, or any other
condition that would cause an open circuit will prevent the clutch from engaging, in which case the machine will
not operate after having braked down from extract speed.
The carbon brushes should be inspected occasionally, and replaced when worn. The copper contact rings may
be cleaned with fine emery when needed. (Do not scratch the surface of the contact rings.)
A short circuit or ground in the centrifugal switch or its associated wiring will cause the
wash speed clutch to engage in high speed rotation. This condition would be identified by
an extremely loud screeching sound as soon as the machine stops extracting. The sound
would be similar to skidding auto tires. Such a malfunction is very dangerous and must be
corrected at once before further operation.
Turn off power at main wall switch before entering centrifugal switch. This assembly carries
high voltage, and remains energized when Miltrol master switch is off.
Over-lubrication of extract motor bearings will force grease into centrifugal switch housing
and will cause the centrifugal switch to malfunction.
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