Harbor Freight Tools Model 99792 - Manual (Page 14)

SKU 99792 For technical questions, please call 1-800-444-3353. Page 14
Troubleshooting
Problem Possible Causes Likely Solutions
Decreased output.
1. Not enough air pressure and/
or air flow.
2. Obstructed trigger.
3. Incorrect lubrication or not
enough lubrication.
4. Blocked air inlet screen (if
equipped).
5. Air leaking from loose housing.
6. Mechanism contaminated.
7. Chisel edge is damaged.
1. Check for loose connections and make sure
that air supply is providing enough air flow
(CFM) at required pressure (PSI) to the
tool’s air inlet. Do not exceed maximum air
pressure.
2. Clean around trigger to ensure free
movement.
3. Lubricate using air tool oil and grease
according to directions.
4. Clean air inlet screen of buildup.
5. Make sure housing is properly assembled
and tight.
6. Have qualified technician clean and lubricate
mechanism. Install in-line filter in air supply
as stated in Initial Set Up: Air Supply.
7. Replace with a new chisel do not sharpen.
Housing heats
during use.
1. Incorrect lubrication or not
enough lubrication.
2. Worn parts.
1. Lubricate using air tool oil and grease
according to directions.
2. Have qualified technician inspect internal
mechanism and replace parts as needed.
Severe air
leakage.
(Slight air leakage
is normal,
especially on older
tools.)
1. Cross-threaded housing
components.
2. Loose housing.
3. Damaged valve or housing.
4. Dirty, worn or damaged valve.
1. Check for incorrect alignment and uneven
gaps. If cross-threaded, disassemble and
replace damaged parts before use.
2. Tighten housing assembly. If housing cannot
tighten properly, internal parts may be
misaligned.
3. Replace damaged components.
4. Clean or replace valve assembly.
Follow all safety precautions whenever diagnosing or servicing the
tool. Disconnect air supply before service.