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SKU 66902 

for technical questions, please call 1-800-444-3353. 

Page 13

troubleshooting

problem

possible causes

likely solutions

Insufficient 

fastener depth.

Incorrect tool depth setting.

1. 

Not enough air pressure. 

2. 

 

 

Incorrect lubrication or not 

3. 

enough lubrication.
Blocked air inlet screen (if 

4. 

equipped).
Mechanism contaminated. 

5. 

 

Adjust depth setting, if available.

1. 

Check for loose connections and make 

2. 

sure that air supply is providing enough air 

pressure (PSI) to the tool’s air inlet.  

do not 

exceed maximum air pressure.

Lubricate using air tool oil and grease 

3. 

according to directions.
Clean air inlet screen of buildup. 

4. 

Have qualified technician clean and lubricate 

5. 

mechanism.  Install in-line filter in air supply 

as stated in Initial Set Up: Air Supply.

Fasteners drive 

too deeply.

Incorrect tool depth setting.

1. 

Too much air pressure.

2. 

Adjust depth setting, if available.

1. 

Reduce air supply pressure (PSI).

2. 

Tool cycles 

without firing 

fastener.

Tool empty.

1. 

Incorrect fastener used.

2. 

Magazine dirty or not 

3. 

lubricated properly.

Insufficient air flow.

4. 

Fill with correct fastener.

1. 

Empty, then fill with correct fastener.

2. 

Clean and lubricate magazine and pusher. 

3. 

Check for loose connections and make 

4. 

sure that air supply is providing enough air 

flow (CFM) and pressure (PSI) to the tool’s 

air inlet.  

do not exceed maximum air 

pressure.

Frequent 

jamming.

Incorrect fastener type.

Confirm fastener diameter, type, length, angle, 

and collation type.  Correct as needed.

Severe air 

leakage.

(Slight air leakage 

is normal, 

especially on 

older tools.)

Cross-threaded housing 

1. 

components. 

Loose housing. 

2. 

 

Damaged valve or housing.

3. 

Dirty, worn or damaged valve. 

4. 

Check for incorrect alignment and uneven 

1. 

gaps.  If cross-threaded, disassemble and 

replace damaged parts before use.
Tighten housing assembly.  If housing cannot 

2. 

tighten properly, internal parts may be 

misaligned.
Replace damaged components.

3. 

Clean or replace valve assembly.

4. 

follow all safety precautions whenever diagnosing or servicing the tool.  

disconnect air supply before service.

back to the engaged position. Use a 

screwdriver to release the jammed 

fastener by probing the openings in 

the magazine. 

Pull out the jammed fastener and the 

3. 

remainder of the fastener strip that is 

still in the magazine. Dispose of the 

remaining fastener strip; it may be 

bent or damaged in some other way. 

If unable to clear jam using the meth

-

4. 

od prescribed above, the tool should 

be repaired by a qualified service 

technician.

Summary of Contents for 66902

Page 1: ...s reserved No portion of this manual or any artwork contained herein may be reproduced in any shape or form without the express written consent of Harbor Freight Tools Diagrams within this manual may...

Page 2: ...ided could result in death or serious injury CAUTION used with the safety alert symbol indicates a hazardous situation which if not avoided could result in minor or moderate injury NOTICE is used to a...

Page 3: ...conditions Wear heavy duty work gloves during use f Always wear eye protec tion Wear ANSI ap proved safety goggles g Always wear hearing protection when using the tool Prolonged expo sure to high inte...

Page 4: ...not intended for use with the specific tool model increases the risk of injury to persons Use only those fasteners listed i in the Accessories section of this manual Fasteners not identified for use w...

Page 5: ...on by the operator and others in the work area Keep fingers away from Trigger 2 when not driving fasteners to avoid accidental firing Always assume the tool contains 3 fasteners Do not point the tool...

Page 6: ...g grinding drill ing and other construction activities contains chemicals known to the State of California to cause cancer birth defects or other reproductive harm Some examples of these chemicals are...

Page 7: ...a choice between dif ferent processes Include vibration free periods each 5 day of work Grip tool as lightly as possible while 6 still keeping safe control of it Let the tool do the work To reduce vib...

Page 8: ...red Note If an automatic oiler system is not used add a few drops of Pneumatic Tool Oil to the airline connection be fore operation Add a few more drops after each hour of continual use Attach an air...

Page 9: ...at the beginning of this manual including all text under subheadings therein before set up or use of this product Inspect tool before use looking for damaged loose and missing parts If any problems a...

Page 10: ...ress the Safety Nosepiece against 7 the workpiece and squeeze the Trigger The tool must cycle fire only once Release the Trigger and squeeze it again The tool must not cycle fire With the Trigger held...

Page 11: ...fas ten Be sure to keep hands fingers and other body parts away from the Nozzle Press the Trigger 42 to activate the 6 Nailer To avoid indenting or marring when 7 working on the face of fine surfaces...

Page 12: ...rocedures are in addition to the regular checks and maintenance explained as part of the regular op eration of the air operated tool Daily Air Supply Maintenance 1 Every day perform maintenance on the...

Page 13: ...an and lubricate magazine and pusher 3 Check for loose connections and make 4 sure that air supply is providing enough air flow CFM and pressure PSI to the tool s air inlet Do not exceed maximum air p...

Page 14: ...scription Q ty 46 Spring Washer 2 47 Head Screw 2 48 Head Cover 1 49 Hex Bolt 3 50 Safety 1 51 Depth Adjusting Knob 1 52 Adjusting Guide 1 53 E Ring 1 54 Spring 1 55 Spacer A 1 56 Hex Bolt 2 57 Driver...

Page 15: ...y 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 expres...

Page 16: ...limitation of incidental or consequential damages so the above limitation of exclusion may not ap ply to you This warranty is expressly in lieu of all other warranties express or implied including th...

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