Harbor Freight Tools Gas Powered Two-Stage Air Compressor 67853 - Manual (Page 16)

Page 14 For technical questions, please call 1-800-444 3353. Item 67853
Troubleshooting
Problem Possible Causes Likely Solutions
Engine will
not start
(Note: See engine
manual for engine
specific issues.)
COMPRESSOR SPECIFIC:
1. Pilot Valve closed.
2. Tank already pressurized.
COMPRESSOR SPECIFIC:
1. Open pilot valve before start procedure, close after unit is
running.
2. Turn engine on. Compressor will turn on as needed when
pressure reaches preset level.
Compressor
overheats
1. Incorrect lubrication or not
enough lubrication.
2. Worn parts.
1. Lubricate using recommended oil or grease according to
directions.
2. Have qualified technician inspect internal mechanism and
replace parts as needed.
Severe air
leakage
1. Poor air outlet seal.
2. Loose cylinder/cylinder head.
3. Damaged valve or housing.
4. Dirty, worn or damaged valve.
1. Tighten or re-attach using thread seal tape.
2. Tighten cylinder/cylinder head assembly. If cylinder/cylinder
head cannot tighten properly, internal parts may be misaligned.
3. Replace damaged components.
4. Clean or replace valve assembly.
Unit stalls
1. Low engine idle.
2. Severely clogged air filter.
3. Improper lubrication.
4. Defective pilot/unloader valve.
1. Qualified technician should increase idle to 2,200±100 RPM by
adjusting pressure switch.
2. Replace air filter.
3. Check for proper oil level.
4. Replace pilot valve.
Excessive noise
1. Loose drive pulley or flywheel.
2. Misaligned pulleys.
3. Lack of oil in crankcase.
4. Worn connecting rod.
5. Worn wrist pin bushing.
6. Worn bearings.
7. Loose belts.
1. Loose pulleys are a common cause of “knocking”. Tighten
appropriate bolts.
2. Align pulleys with straightedge and secure in place.
3. Check for proper oil level.
4. Replace connecting rod.
5. Remove piston assembly and replace necessary parts.
6. Replace bearings and oil.
7. Check for proper belt tension.
Oil in the
discharge air
1. Wrong type of oil or low-
quality oil.
2. Overheating.
3. Restricted intake air.
4. Worn piston rings.
5. Excessive moisture in the
tank.
1. Change oil. Check oil recommendations under EQUIPMENT
SET UP, Equipment Oil Fill section of this manual.
2. See above Excessive Noise section.
3. Clean or replace air filter.
4. Replace piston rings.
5. Drain moisture from the tank daily.
Low discharge
pressure
1. Air leaks.
2. Leaking valves.
3. Restricted air intake.
4. Blown gaskets.
5. Slipping belts.
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. Remove head and inspect for valve breakage, weak
valves, scored valve plate, etc. Replace defective parts and
reassemble. Replace head gasket each time the head is
removed.
3. Clean or replace air filter element.
4. Replace and gaskets proven faulty on inspection.
5. Tighten Belts (See monthly maintenance.)
Follow all safety precautions whenever diagnosing or servicing the equipment or engine.