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2 MAINTENANCE
PRINCIPLES OF OPERATION
STANDARD SYSTEM OPERATING CHARACTERISTICS, 5 hp & 10 hp
The system uses special cylinders to move the ram and two timers to control the operation of
the ram. When the hydraulic cylinders used in the self-contained compactors are fully
extended or retracted, they bypass internally. This makes it impossible for the hydraulic
system to reach relief pressure. The sequence of operation for this system is as follows:
Upon startup, a contact is made that energizes the motor starter, starting the electric motor
and at the same time energizing T1 timer coil. When T1 is energized, the valve solenoid shifts
the valve so that the hydraulic oil is directed to extend the cylinder which extends the ram.
When T1 timer times out, the contacts reverse causing T2 timer to energize and the solenoid
to shift the valve into the reverse position. In this position, the valve directs the hydraulic oil
into the front end of the cylinder causing the cylinder to retract, therefore causing the ram to
retract. When T2 timer times out, the motor starter contact is opened causing the motor
starter to shut down, therefore causing the motor/power unit to shut down.
2 MAINTENANCE
1. Disconnect and lock-out power per the procedure on page 16.
2. Remove access covers from compactor.
2. Remove hoses (4 for 88SC & 250SC, 2 for 100SC & 250 Ultra).
3. Remove cylinder pins.
4. Remove cylinders (2 for 88SC, 250SC, & 250 Ultra, 1 for 100SC).
5. To install the cylinders, reverse the above steps.
CYLINDER REMOVAL INSTRUCTIONS
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