Harbor Freight Tools 3670 Troubleshooting, Problem Possible Causes Likely Solutions

loose hardware, misalignment or binding of moving parts, cracked or broken parts, damaged electrical wiring, and any other condition that may affect its safe operation.

2.After Use, wipe external surfaces of the tool with clean cloth. Do not use solvents.

3.Inspect the Chuck and remove any dirt or debris.

4.PERIODICALLY check the Mounting Screws (3) and tighten if necessary.

5.If Carbon Brushes (14) are worn, contact

Harbor Freight Tools for replacements and have a qualified service technician replace them.

6.WARNING! If the supply cord of this power tool is damaged, it must be replaced only by a qualified service technician.

Troubleshooting

Problem		Possible Causes		Likely Solutions
Tool will not start.	1.	Cord not connected.	1.	Check that cord is plugged in.
	2.	No power at outlet.	2.	Check power at outlet. If outlet is unpowered,
				turn off tool and check circuit breaker. If breaker
				is tripped, make sure circuit is right capacity for
				tool and circuit has no other loads.
	3.	Internal damage or wear.	3.	Have technician service tool.
		(Carbon brushes or switch, for
		example.)
Tool operates slowly.	1.	Extension cord too long or wire	1.	Eliminate use of extension cord. If an extension
		size too small.		cord is needed, use shorter/heavier gauge cord.
				See Extension Cords in GROUNDING section.
	2.	Applying too much pressure.	2.	Lessen amount of pressure on tool by turning
				torque setting to it minimum.
Performance	1. Accessory dull or damaged.		1.	Keep cutting accessories sharp. Replace as
decreases over time.				needed.
	2.	Carbon brushes worn or	2.	Have qualified technician replace brushes.
		damaged.
Excessive noise or	Internal damage or wear. (Carbon		Have technician service tool.
rattling.	brushes or bearings, for example.)
Overheating.	1.	Forcing tool to work too fast.	1.	Allow tool to work at its own rate.
	2.	Accessory misaligned.	2.	Check and correct accessory to fence and/or
				table alignment.
	3.	Accessory dull or damaged.	3.	Keep cutting accessories sharp. Replace as
				needed.

4.Blocked motor housing vents. 4. Wear ANSI-approved safety goggles and NIOSH- approved dust mask/respirator while blowing dust out of motor using compressed air.

5. Motor being strained by long or	5. Eliminate use of extension cord. If an extension
small diameter extension cord.	cord is needed, use one with the proper diameter
	for its length and load. See Extension Cords in
	GROUNDING section.

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

SKU 3670 For technical questions, please call 1-800-444-3353. Page 11