Harbor Freight Tools 67708 Troubleshooting, Problem Possible Causes Likely Solutions

Troubleshooting

Problem		Possible Causes		Likely Solutions
Compressor does	1.	Incorrect power supply.	1.	Check that circuit matches compressor requirements.
not start or restart	2.	No power at outlet.	2.	Reset circuit breaker, or have outlet serviced by a qualified
				technician.
	3.	Power cord not plugged in	3.	Check that cord is plugged in securely.
		properly.
	4.	Thermal overload switch	4.	Turn off Tool. Turn off Compressor and wait for it to cool down.
		tripped.		Press reset button. Resume operation.
	5.	Building power supply circuit	5.	Reset circuit or replace fuse. Check for low voltage conditions.
		tripped or blown fuse.		It may be necessary to disconnect other electrical appliances
				from the circuit or move the compressor to its own circuit.
	6.	Tank(s) already pressurized.	6.	No problem. Compressor will start when needed.
	7.	Cord wire size is too small or	7.	Use larger diameter or shorter extension cord or eliminate
		cord is too long to properly		extension cord. See Recommended Wire Gauge for Extension
		power compressor.		Cords in Safety section.
	8.	Compressor needs service.	8.	Have unit inspected by a qualified technician.
Compressor builds	1.	Incorrect power supply.	1.	Check that circuit matches compressor requirements.
pressure too slowly	2.	Crankcase overfilled with oil or	2.	Drain oil and refill to proper level with recommended oil.
		oil too thick.

3.Working environment too cold. 3. Move unit to a warmer location. Check that recommended oil is in crankcase.

	4.	Safety valve needs service.	4.	Listen for air leaking from valve. If leaking replace with
				identical valve with same rating.
	5.	Loose fittings.	5.	Reduce air pressure, then check all fittings with a soap solution
				for air leaks and tighten as needed. Do not overtighten.
Compressor not	1.	Filters need cleaning/replacing.	1.	Check inlet and outlet filters. Clean and/or replace as needed.
building enough air	2.	Crankcase oil too thick.	2.	Drain oil and refill to proper level with recommended oil.
pressure	3.	Check Valve needs service.	3.	Have technician clean or replace, as needed.
	4.	Compressor not large enough	4.	Check if accessory SCFM is met by Compressor. If
		for job.		Compressor cannot supply enough air flow (SCFM), you need
				a larger Compressor.
	5.	Loose fittings.	5.	Reduce air pressure, then check all fittings with a soap solution
				for air leaks and tighten as needed. Do not overtighten.
	6.	Hose or hose connections not	6.	Replace with larger hose and/or hose connections.
		adequate.
	7.	High altitude reducing air	7.	You may need a larger compressor if you are situated in a high
		output.		altitude location.
High Oil	1.	Crankcase oil too thin.	1.	Drain oil and refill to proper level with recommended oil.
Consumption	2.	Unit not on level surface.	2.	Reposition unit on a level surface.
	3.	Crankcase vent clogged.	3.	Clean Crankcase vent.

Follow all safety precautions whenever diagnosing or servicing the compressor. Disconnect power supply before service.

SKU 67708 For technical questions, please call 1-800-444-3353. Page 15