Harbor Freight Tools 91773 Troubleshooting, Please Read the Following Carefully

Troubleshooting

Problem		Possible Causes		Likely Solutions
Decreased output.	1. Not enough air pressure and/		1.	Check for loose connections and make sure that air
		or air flow.		supply is providing enough air flow (CFM) at required
				pressure (PSI) to the tool’s air inlet. Do not exceed
				maximum air pressure.
	2.	Obstructed trigger.	2.	Clean around trigger to ensure free movement.
	3.	Incorrect lubrication or not	3.	Lubricate using air tool oil and grease according to
		enough lubrication.		directions.
	4.	Blocked air inlet screen (if	4.	Clean air inlet screen of buildup.
		equipped).
	5.	Air leaking from loose housing.	5.	Make sure housing is properly assembled and tight.
	6.	Mechanism contaminated.	6.	Have qualified technician clean and lubricate
				mechanism. Install in-line filter in air supply as stated
				in Initial Set Up: Air Supply.
Housing heats	1.	Incorrect lubrication or not	1.	Lubricate using air tool oil and grease according to
during use.		enough lubrication.		directions.
	2.	Worn parts.	2.	Have qualified technician inspect internal mechanism
				and replace parts as needed.
Severe air	1. Cross-threaded housing		1.	Check for incorrect alignment and uneven gaps. If
leakage.		components.		cross-threaded, disassemble and replace damaged
(Slight air leakage				parts before use.
is normal,	2. Loose housing.		2.	Tighten housing assembly. If housing cannot tighten
especially on older				properly, internal parts may be misaligned.
tools.)	3.	Damaged valve or housing.	3.	Replace damaged components.
	4.	Dirty, worn or damaged valve.	4.	Clean or replace valve assembly.
Decreased sanding	Dull or caked sandpaper.		Replace sandpaper.
performance

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

PLEASE READ THE FOLLOWING CAREFULLY

The manufacturer and/or distributor has provided the parts list and assembly diagram in this manual as a reference tool only. Neither the manufacturer or distributor makes any representation or warranty of any kind to the buyer that he or she is qualified to make any repairs to the product, or that he or she is qualified to replace any parts of the product. In fact, the manufacturer and/or distributor expressly states that all repairs and parts replacements should be undertaken by certified and licensed technicians, and not by the buyer. The buyer assumes all risk and liability arising out of his or her repairs to the original product or replacement parts thereto, or arising out of his or her installation of replacement parts thereto.

REV 10f
SKU 91773	For technical questions, please call 1-800-444-3353.	Page 13