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H7949/H7950/H7951 Nailer
-24-
TROUBLESHOOTING
Symptom Possible Cause Solution
Air leaking at trig-
ger valve area.
1. O-rings in trigger valve hous-
ing are damaged.
1. O-rings must be replaced.
Air leaking between
housing and hose.
1. Loose screws in housing.
2. Damaged O-ring.
3. Loose air fitting.
1. Tighten screws.
2. Replace O-ring.
3. Tighten air fitting & use
Teflon tape.
Air leaking between
housing and cap
assembly.
1. Damaged cap gasket. 1. Replace gasket.
Tool skips nails
while discharging.
1. Air leaks.
2. Dirt in nose.
3. Dirt or damage prevents nails
from moving freely in maga
-
zine.
4. Inadequate air flow to tool.
5. Worn O-ring on piston or lack
of lubrication.
6. Damaged O-rings on trigger
valve.
7. Worn bumper.
1. Tighten screws and fittings.
2. Clean nose.
3. Clean magazine, inspect/
repair damage; insert a
clean strip of nails.
4. Check fitting, hose, com
-
pressor & air pressure.
5. Replace piston O-ring.
Lubricate.
6. Replace trigger valve O-
rings.
7. Replace bumper.
Tool runs slowly
or has a loss of
power.
1. Nailer is not sufficiently lubri
-
cated.
2. Compressor is not supplying
at least 70 PSI of air pressure
to the tool.
3. Exhaust port in cap is blocked.
1. Lubricate nailer.
2. Repair or replace your
compressor.
3. Clean or replace damaged
internal parts.
Nails frequently jam
in the nailer nose.
1. Nails are the wrong size.
2. Nails are bent or dirty.
3. Magazine or nose screws are
loose.
4. Driver or driver guide are worn
or damaged.
5. Nails are wrong angle.
1. Use correct nails.
2. Use undamaged, clean
nails.
3. Tighten magazine.
4. Replace worn or damaged
parts.
5. Use correct angle nails.
Nailer does not fire. 1. Nail is jammed in magazine or
discharge area.
2. Piston shaft is damaged.
3. Air pressure too low.
1. Clear nailer magazine or
discharge area.
2. Replace piston shaft.
3. Check/increase air pres
-
sure.