FAULT FINDING
23
UP6RD–5–175, UP6RM–5–175, UP6RD–5–175
PROBLEM
POSSIBLE CAUSE
POSSIBLE SOLUTION
Excessive starting and
stopping
1. Air leaks in air discharge piping.
2. Pressure switch differential too narrow.
3. Leaking check valve or check valve seat blown out.
4. Excessive condensate in receiver tank.
1. Check tubing and connections.
2. Adjust pressure switch to increase differential, if
differential adjustment is provided. Install pressure switch
with differential adjustment feature if differential adjustment
is desired.
3. Replace check valve.
4. Drain receiver tank with manual drain valve.
High oil consumption
1. Clogged or dirty inlet and/or discharge line filter.
2. Lubricant viscosity too low.
3. Detergent type lubricant being used.
4. Piston rings damaged or worn (broken, rough or
scratched). Excessive end gap or side clearance.
5. Piston rings not seated, are stuck in grooves or end
gaps not staggered.
6. Cylinder(s) or piston(s) scratched, worn or scored.
7. Connecting rod, piston pin or crankpin bearings worn or
scored.
8. Crankshaft seal worn or crankshaft scored.
9. Worn cylinder finish.
1. Clean or replace.
2. Drain existing lubricant and refill with proper lubricant.
3. Drain existing lubricant and refill with proper lubricant.
4. Install ring kit.
5. Adjust piston rings.
6. Repair or replace as required.
7. Inspect all. Repair or replace as required.
8. Replace seal or crankshaft assembly.
9. Deglaze cylinder with 180 grit flex–hone.
Knocking or rattling
1. Loose beltwheel or motor pulley, excessive end play in
motor shaft or loose drive belts.
2. Compressor valves leaky, broken, carbonized or loose.
3. Carbon build–up on top of piston(s).
4. Cylinder(s) or piston(s) scratched, worn or scored.
5. Connecting rod, piston pin or crankpin bearings worn or
scored.
6. Defective ball bearings on crankshaft or motor shaft.
1. Check beltwheel, motor pulley, crankshaft, drive belt
tension and alignment. Repair or replace as required.
2. Inspect valves. Clean or replace as required. Install
valve kit.
3. Clean piston(s). Repair or replace as required.
4. Repair or replace as required.
5. Inspect all. Repair or replace as required.
6. Inspect bearings and replace crankshaft assembly if
required.
Lights flicker or dim when
running
1. Improper line voltage.
2. Wiring or electric service panel too small.
3. Poor contact on motor terminals or starter connections.
4. Improper starter overload heaters.
5. Poor power regulation (unbalanced line).
1. Check line voltage and upgrade lines as required.
Contact electrician.
2. Install properly sized wire or service box. Contact
electrician.
3. Ensure good contact on motor terminals or starter
connections.
4. Install proper starter overload heaters. Contact
electrician.
5. Contact power company.
Moisture in crankcase or
”milky” appearance in
petroleum lubricant or
rusting in cylinders
1. Detergent type lubricant being used.
2. Extremely light duty cycles.
3. Unit located in damp or humid location.
1. Drain existing lubricant and refill with proper lubricant.
2. Run unit for longer duty cycles.
3. Relocate unit.
Summary of Contents for UP6RD-5-175
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