R-Pro › Field cases › Refrigeration systems
Oil Pump Failure
Likely causes
Oil pump gear or rotor worn
Check: Clean or replace oil filter and strainer
What to do: Clean or replace oil filter and strainer → Measure pressure differential across oil filter → Disassemble and inspect oil pump (gear wear, clearance check) → Replace oil pump using manufacturer-specified parts → Re-measure oil pressure after replacement to confirm normal
Oil filter clogged causing poor oil supply
Check: Measure pressure differential across oil filter
What to do: Measure pressure differential across oil filter → Disassemble and inspect oil pump (gear wear, clearance check) → Replace oil pump using manufacturer-specified parts → Re-measure oil pressure after replacement to confirm normal
Oil strainer fouled
Check: Disassemble and inspect oil pump (gear wear, clearance check)
What to do: Disassemble and inspect oil pump (gear wear, clearance check) → Replace oil pump using manufacturer-specified parts → Re-measure oil pressure after replacement to confirm normal
Oil level is normal and valve is correctly set, but oil pressure is low. Inspect the oil pump itself. Oil pump replacement requires compressor disassembly — fully recover refrigerant before proceeding.
All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.
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