York Millennium YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4 Operating & Maintenance Manual page 48

TABLE 2 – OPERATING ANALYSIS CHART (Continued)
RESULTS
6. SYMPTOM: USUALLY HIGH OIL PRESSURE DEVELOPS WHEN OIL PUMP RUNS
Unusually high oil pressure is displayed
when the oil pressure display key is
pressed when the oil pump is running.
7. SYMPTOM: OIL PUMP VIBRATES OR IS NOISY
Oil pump vibrates or is extremely noisy
with some oil pressure when pressing
OIL PRESSURE display key.
NOTE: When oil pump is run without
an oil supply it will vibrate and
become extremely noisy.
8. SYMPTOM: OIL PRESSURE GRADUALLY DECREASES (Noted by Observation of Daily Log Sheets)
Oil pressure (noted when pressing OIL
PRESSURE display key) drops to 70%
of oil pressure when compressor was
originally started.
9. SYMPTOM: OIL PRESSURE SYSTEM CEASES TO RETURN AN OIL/REFRIGERANT SAMPLE
Oil refrigerant return not functioning.
10. SYMPTOM: OIL PUMP FAILS TO DELIVER OIL PRESSURE
No oil pressure registers when pressing
OIL PRESSURE display key when oil
pump runs.
11. SYMPTOM: REDUCED OIL PUMP CAPACITY
Oil pump pumping capacity.
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POSSIBLE CAUSE
High oil pressure. Trans-
ducer defective. Relief
valve is misadjusted.
Misalignment of pump or
Mounting bolts loose.
Bent shaft.
Worn pump parts.
Oil not reaching pump
suction inlet in sufficient
quantity.
Oil filter is dirty.
Extreme bearing wear.
Filter-drier in oil return
system dirty.
Jet or orifice of oil return
jet clogged.
Faulty oil pressure
transducer
Faulty wiring/connectors.
Excessive end clearance
pump.
Other worn pump parts.
Partially blocked oil supply
inlet.
REMEDY
Replace low or high oil pressure
transducer. Adjust external relief
valve.
Correct condition or replace faulty
part.
Check oil supply and oil piping.
Change oil filter.
Inspect compressor.
Replace old filter-drier with new.
Remove jet, inspect for dirt. Remove
dirt using solvent and replace.
Replace oil pressure transducer.
Inspect and replace worn parts.
Check oil inlet for blockage.
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