070.250-IOM1 (NOV 2013)
Page 23
TDS_ Rotary Screw Compressor
Maintenance
Troubleshooting the oil pump and system
Symptom Probable causes and corrections
Pump will not produce enough oil
pressure at start-up
Check that service valves are open.
Filtercartridgesmaybeblocked.CheckPSIDacrosslters.
Strainer may be blocked. Clean.
Oil pressure regulator set too low or stuck open. Readjust or repair.
Pump worn out. Repair or replace.
Oil pressure rapidly drops off
when compressor starts
Main oil injection throttling valve too wide open or oil pressure regulating valve
improperly adjusted. Readjust both valves.
Noise and vibration Pump strainer blocked. Clean.
Pump worn out. Repair or replace.
Oil pressure drops as head
pressure increases
Normal behavior. Set main oil injection and oil pressure for maximum head pressure
condition.
Mainunitlterpsidistoohigh Filters clogged with dirt. Replace.
Oil is too cold. Allow oil to warm up and check again.
Servicevalveonlteroutletispartiallyclosed.Openvalvesfully.
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