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The unloader pilot is located on the crankcase and is
connected to the unloader by a copper line. The 3/4 HP
unit uses a pilot that is mechanically activated. All
others are operated by oil pressure (Fig. 9). The units
should be disassembled and cleaned if they are suspect.
See Parts List for repair kits, if required.
PRV STATION
Some 1/4 to 2 HP units use a Honeywell PP902
PRV. For detailed maintenance and repair information,
see Honeywell Sheet No. 75-2558.
The PRV station used on 3

PARTS LIST

INTAKE
FILTERS
1/4 TO 2 HP
INTAKE
QUINCY
# 8 8 3 9 W I T H 8 9 1 4 A D A P T E R
Fig.
75-7131
HP
units is a combination
FILTER
5319
10.
of Pall-Trinity-Micro Corp. filter and Norgren regulator
and relief valve.
To perform any maintenance and repair work on the
PRV station, first shut off air supply from tank. Then,
bleed down system by manually operating the
(push red button on drain valve). Note that all valves
and dampers will return to their normal position.
The regulator and relief valve can now be removed
and replaced or repaired in place with the appropriate
List).
repair kit (see Parts
After repairing or replacing, slowly turn air back on
checking for leaks.
QUINCY AIR MAZE INTAKE FILTER
STANDARD
Quincy Part Numbers
"5
HP No. 4363HX
10
drain
OUTDOOR
5318
Fig. 11.

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