JOHNSON CONTROLS
38
FORM 160.69-O2
ISSUE DATE: 9/30/2020
SECTION 5 – TROUBLESHOOTING
TABLE 1 – OPERATION ANALYSIS CHART (CONT'D)
RESULTS POSSIBLE CAUSE REMEDY
SYMPTOM: OIL PUMP VIBRATES OR IS NOISY
Oil pump vibrates or is extremely noisy
with some oil pressure when pressing
OIL PRESSURE display key.
When oil pump is run
without an oil supply
it will vibrate and be-
come extremely noisy.
Oil not reaching pump suction inlet in
sucient quantity.
Check oil level.
Worn or failed oil pump. Repair/Replace oil pump.
SYMPTOM: REDUCE OIL PUMP
Oil pump pumping capacity.
Excessive end clearance pump. Other
worn pump parts
Inspect and replace worn parts.
Partially blocked oil supply inlet. Check oil inlet for blockage.
SYMPTOM: OIL PRESSURE GRADUALLY DECREASES (NOTED BY OBSERVATION OF DAILY LOG SHEETS)
When oil pump VSD frequency in-
creases to 55 + hz to maintain target oil
pressure.
Oil lter is dirty. Change oil lter.
SYMPTOM: OIL PRESSURE SYSTEM CEASES TO RETURN AN OIL/REFRIGERANT SAMPLE
Oil refrigerant return not functioning.
Filter-drier in oil return system dirty. Replace old lter-drier with new.
Jet or orice of oil return jet clogged.
Remove jet, inspect of dirt. Remove dirt
using solvent and replace.
SYMPTOM: OIL PUMP FAILS TO DELIVER OIL PRESSURE
No oil pressure registers when pressing
OIL PRESSURE display key when oil
pump runs.
Faulty oil pressure transducer. Faulty
wiring/connectors.
Replace oil pressure transducer.
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