Maintenance
4-2
HP6A Manual
Air Filter / Regulator
To maintain maximum filtering and efficiency, and to avoid excessive pressure drop, the filter regulator
must be kept clean. Erratic regulator operation or loss of regulation is most always due to dirt in the disc
area. If the air supply is kept clean the regulator should provide long periods of uninterrupted service.
As needed, Depressurize and disassemble the filter / regulator (remove the *bowl, filter and disc
assembly). Clean parts with denatured alcohol and blow out body with compressed air. When
reassembling, make sure disc stem fits into its center hole of diaphragm assembly. If diaphragm
assembly is replaced, make sure disc stem fits into its center. Tighten bonnet slightly more than finger
tight (50 inch pounds).
Wash porous filter elements with denatured alcohol.
*Clean plastic bowl only with household soap.
Coolant Pump Honing Oil
The coolant pump is located in the back of the splash tank. The coolant drains under the block fixture
into a sump under the machine.
Every 8 hours, change the filter paper. Change the honing oil when it gets dirty. When changing oil,
completely clean tank and filter screen. Use 50 gallons max. of Mobilmet Upsilon or any equivalent
light honing oil (ISO ).
Hydraulic System
This system is used to regulate the stroking speed.
Every 175 hours, check the hydraulic liquid level in the back of the carriage under the Rocker Arm. If
hydraulic oil is needed add specified oil to the top of the reservoir. Remove breather to fill. Fill to
mark on reservoir.
Use Mobil DTE EXCEL 46, or equivalent ISO VG 46 hydraulic oil.
Muffler Exhaust
(See page 6.23)
The exhaust muffler on the main stroking system must be replaced periodically. If hone loses power in
the stroking operation, a plugged exhaust muffler could cause it.
The exhaust muffler is located at the rear of the machine. Remove the mount screws from enclosure.
Remove cover. Unscrew the muffler and replace with a new filter.
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