Pump Manual

6
Maintenance-Trouble Shooting-Repairs
Problem
Check Points
Abnormal Piston, ring or cylinder wear
1,20,21,32,33,36
Compressor does not come up to speed
2,13,22,25,34
Air delivery drops off
3,19,25,27,28,32,38
Compressor is slow to come up to speed
4,18,12,31
Safety/relief valve “pops”
5
High inter stage pressure
5
Low inter stage pressure
6
Compressor runs excessively hot
7,17,23,30,35,37,39,40,41
Compressor will not unload cycle
8,16,4
Oil leaking from shaft seal
9
Moisture in crankcase or "Milky" appearance in
oil or rusty in cylinders
10,15,26,
Excessive starting and stopping
11,14,27,29,43
Oil in discharge air (oil pumping)
1,13,21,28,32,9,36
Compressor will not unload when stopped
4,24
Check Points
Possible Solution
1
Lubricant viscosity to low
Drain existing lubricant and refill with proper lubricant
2
Loose belt wheel or motor pulley, excessive
end play in motor shaft or loose drive belts
Check belt wheel, motor pulley, crankshaft, drive belt
tension and alignment. Repair or replace as required.
3
Clogged or dirty inlet and/or discharge line
filter
Clean or replace
4
Leaking or maladjusted centrifugal pilot
valve.
Replace pilot valve O-ring. Adjust pilot valve
5
High pressure inlet valve leaking
Inspect, clean or repair as required