Use and Care Manual

TROUBLESHOOTING GUIDE
MAINTENANCE /
REPAIR
TROUBLESHOOTING OPERATION
ASSEMBLY /
INSTALLATION
SAFETY /
SPECIFICATIONS
GETTING STARTED
10
OPERATION
SYMPTOM POSSIBLE CAUSE(S) CORRECTIVE ACTION
Low discharge pressure
1. Air leaks 1. Listen for escaping air. Apply soap solution to
all fittings and connections. Bubbles will appear
at points of leakage. Tighten or replace leaking
fittings or connections.
2. Leaking valves 2. Remove head and inspect for valve breakage,
weak valves, scored valve seats, etc. Replace
defective parts and reassemble.
Be sure that the old head gasket
is replaced with a new one each
time the head is removed.
3. Restricted air intake 3. Clean the air filter element.
4. Slipping belts 4. Loosen engine clamping bolts and move the
engine in a direction away from the compressor,
being sure that the engine pulley is perfectly
aligned with the flywheel. Tighten engine
clamping bolts. The belt should deflect about 1/2
inch under 5-lbs of force. Do not “roll” belts over
pulleys.
5. Blown gaskets 5. Replace any gaskets proven faulty on inspection.
6. Low compression 6. Low pressure can be due to worn rings and
cylinder walls. Correction is made by replacing
the rings, cylinders, and pistons as required.
Overheating 1. Poor ventilation 1. Relocate the compressor to an area where an ample
supply of cool, clean, dry and well-circulated air is
available.
2. Dirty cooling surfaces 2. Clean the cooling surfaces of pump and motor-engine.
Excessive belt wear
1. Pulley out of alignment 1. Realign engine pulley with compressor pulley
2. Belt too loose or too tight 2. Adjust tension (See Drive Belt Section).
3. Belt slipping 3. Adjust tension or replace belt (See Drive Belt
Section).
4. Pulley wobbles 4. Check for worn crankshaft, keyway or pulley bore
resulting from running the compressor or motor
with loose pulleys. Check for bent pulleys or bent
crankshaft.
Unit stalls 1. Low engine idle 1. Increase idle, refer to engine manual for details
2. Improper lubrication 2. See Lubrication section of manual.
3. Low oil level 3. Check oil level. Fill if necessary
4. Defective unloader valve 4. Replace
Excessive noise (knocking) 1. Loose engine or compressor pulley 1. Tighten pulley clamp bolts and set-screws.
2. Lack of oil in crankcase 2. Check for proper oil level; if low, check for
possible damage to bearings. Dirty oil can cause
excessive wear.
3. Worn connecting rod 3. Replace connecting rod.
4. Worn piston pin bushing 4. Remove piston assemblies from the compressor
and inspect for excess wear. Replace excessively
worn piston pin or pistons, as required.
5. Worn bearings 5. Replace worn bearings and change oil.
6. Piston hitting the valve plate 6. Remove the compressor head and valve plate
and inspect for carbon deposits or other foreign
matter on top of piston. Replace head and valve
plate using new gasket.
7. Noisy check valve 7. Replace.