Use and Care Manual

Operating Instructions
6
Excessive noise in
operation
Knock – same cycle as
RPM of pump
Knock occurs while
compressor is loading
Milky oil in oil
reservoir
Excessive oil
consumption
Oil in discharge air
Compressor vibrates
Air blowing out of
inlet
Insufficient pressure at
point of use
1. Loose pulley, flywheel, belt,
belt guard, cooler, clamps or
accessories
2. Lack of oil in crankcase
3. Piston hitting the valve plate
4. Compressor floor mounting
loose
5. Defective crankcase
6. Excessive crankcase end play
1. Main bearings
2. Connecting rod bearings
3. Loose flywheel
1. Connecting rod bearings
2. Wrist pins, wrist pin bearings
3. Loose connecting rod nut
Water entering oil reservoir due
to compressor operating in high
humidity environment
1. Restricted air intake
2. Oil leaks
3. Worn piston rings
4. Wrong oil viscosity
5. Compressor tilted too much
6. Scored cylinder
1. Compressor air intake restricted
2. Worn piston rings
3. Excessive oil in compressor
4. Wrong oil viscosity
1. Mounting bolts loose
2. Compressor not properly
mounted
3. Pulley and flywheel mis-aligned
4. Belts loose or mismatched
5. Bent crankshaft
Broken inlet valve
1. Leaks or restriction
2. Restricted air intake
3. Slipping belts
4. Service hose or pipe too small
5. Excessive air requirement
6. Broken valve
1. Tighten
2. Check for possible damage to bearings, replenish oil
3. Remove the compressor cylinder head and inspect for foreign
matter on top of the piston. Replace with a new gasket and
reassemble the head
4. Tighten
5. Repair or replace
6. Adjust and shim properly
1. Replace bearings
2. Replace rod
3. Tighten
1. Replace rod
2. Replace complete piston assembly
3. Tighten
a. Pipe air intake to less humid air source
b. Service unit (change oil, clean or replace air cleaner
element, drain tank) more often
1. Clean or replace air filter
2. Tighten bolts or replace gasket
3. Replace rings
4. Drain oil, refill with oil of proper viscosity. See “Pump
Lubrication”
5. Level compressor
6. Replace cylinder and rings
1. Clean air filter element and check for other restrictions in the
intake system
2. Replace rings
3. Drain down to proper level
4. Check viscosity. See “ Pump Lubrication”
1. Tighten
2. Level compressor so that all feet touch the floor before
tightening down. Use shims if necessary
3. Realign
4. Tighten belts. See “Maintenance” section
5. Replace crankshaft
Replace valve plate assembly
1. Check for leaks or restriction in hose or piping. Repair or
replace
2. Clean or replace air filter element
3. Tighten belts, See “Maintenance” section
4. Replace with larger hose or pipe
5. Limit air usage to compressor capacity by using fewer or
smaller tools
6. Replace reed valve assembly
Symptom Possible Cause(s) Corrective Action
TROUBLESHOOTING CHART