This section aids isolation of most common problems
and pinpoints causes. Notify Honeywell Applications
Engineering (Arlington Heights) of any other problems
W R O N G O I L P R E S S U R E
Oil pressure in the 10 to 20 lb/in2 (70 to 140 kPa)
range is normal. The recommended operating pressure is
15 lb/in2 (100 kPa). There should be no pressure during
the off cycle.
O I L P R E S S U R E A D J U S T M E N T
(See Fig. 6)
Check oil level before adjusting pressure The oil
pressure is regulated by a spring-loaded ball mounted in
the bearing carrier on the same side as the dipstick,
Loosen the adjustment lock nut before making any
adjustment. Turn the pressure adjusting screw slowly
clockwise (pressure increases) until the oil gage registers
approximately 15 lb/in2
tighten adjustment screw lock nut.
OIL INTAKE FILTER (I TO 3 HP ONLY)
M A Y B E R E M O V E D F O R C L E A N I N G
AND INSPECTION OF CRANKCASE
A C C U M U L A T I O N
Fig. 6. Crankcase End View of l-HP (0.75 kW) Model.
(100 kPa). After adjustment,
ROTATION OF FLYWHEEL
If oil pressure is low, check oil pump(s) and pressure
gage(s) by unscrewing the pressure gage(s) slowly until
oil seeps out around the threads during compressor(s)
operation. This indicates that oil pressure is reaching the
system and the pressure gage(s). The pumps require oil
pressure to operate intake valve unloaders and for lubri-
cation. Lack of pumping ability indicates possible loss of
oil pressure. If oil appears at the threads of the gage and
the oil pressure gage indicates no pressure, replace the oil
pressure gage. No oil appearing at the threads of the oil
gage indicates possible oil pump failure (see OIL PUMP
REPLACEMENT paragraph in the REPAIR section),
NOTE: A clogged oil intake filter will cause restricted
oil flow in the loop system and no air pressure
in the system. Clean or replace filter as neces-
In cases of low (not zero) pressure, the cause may be
excessive wear in the pumping unit or a gage not in calibra-
tion. Check the pump-up time against Table 3 and listen
for unusual knocks indicating worn bearings. If pump up
time is normal and no unusual noises are detected, recali-
brate or replace the gage.
Table 3. Pump Up Time in Min:Sec.
Oil leaks usually occur around screws and gaskets.
These are normally corrected by tightening screws or
If unable to locate the source of the leak, clean the
unit as much as possible and sprinkle the suspected area
with talcum powder (avoid getting powder into intake).
After several hours, check powder to locate leak.