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TROUBLE SHOOTING
P
ROBLEM
C
AUSE
C
ORRECTION
T
rigger valve housing leaks air O-ring cut or cracked . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Replace O-ring
T
rigger valve stem leaks air O-ring/seals cut or cracked . . . . . . . . . . . . . . . . . . . . . . . . . .Replace trigger valve assembly
Frame/nose leaks air Loose nose screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tighten and recheck
O-ring or Gasket is cut or cracked . . . . . . . . . . . . . . . . . . . .Replace O-ring or gasket
B
umper cracked/worn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Replace bumper
Frame/cap leaks air Damaged gasket or seal . . . . . . . . . . . . . . . . . . . . . . . . . . . .Replace gasket or seal
Cracked/worn head valve bumper . . . . . . . . . . . . . . . . . . . . .Replace bumper
Loose cap screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tighten and recheck
F
ailure to cycle Air supply restriction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Check air supply equipment
T
ool dry, lack of lubrication . . . . . . . . . . . . . . . . . . . . . . . . . .Use Bostitch Air Tool Lubricant
Worn head valve O-rings . . . . . . . . . . . . . . . . . . . . . . . . . . . .Replace O-rings
Broken cylinder cap spring . . . . . . . . . . . . . . . . . . . . . . . . . .Replace cylinder cap spring
H
ead valve stuck in cap . . . . . . . . . . . . . . . . . . . . . . . . . . . .Disassemble/Check/Lubricate
Lack of power; slow to cycle Tool dry, lacks lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . .Use Bostitch Air Tool Lubricant
Broken cylinder cap spring . . . . . . . . . . . . . . . . . . . . . . . . . .Replace cap spring
O
-rings/seals cut or cracked . . . . . . . . . . . . . . . . . . . . . . . . .Replace O-rings/seals
E
xhaust blocked . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Check bumper, head valve spring, muffler
Trigger assembly worn/leaks . . . . . . . . . . . . . . . . . . . . . . . . .Replace trigger assembly
Dirt/tar build up on driver . . . . . . . . . . . . . . . . . . . . . . . . . . . .Disassemble nose/driver to clean
Cylinder sleeve not seated correctly on bottom bumper . . . .Disassemble to correct
H
ead valve dry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Disassemble/lubricate
A
ir pressure too low . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Check air supply equipment
Skipping fasteners; intermittent feed Worn bumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Replace bumper
Tar/dirt in driver channel . . . . . . . . . . . . . . . . . . . . . . . . . . . .Disassemble and clean nose and driver
Air restriction/inadequate air flow through
quick disconnect socket and plug . . . . . . . . . . . . . . . . . . . . .Replace quick disconnect fittings
Worn piston O-ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Replace O-ring, check driver
Tool dry, lacks lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . .Use Bostitch Air Tool Lubricant
Damaged pusher spring . . . . . . . . . . . . . . . . . . . . . . . . . . . .Replace spring
Low air pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Check air supply system to tool
Loose magazine nose screws . . . . . . . . . . . . . . . . . . . . . . . .Tighten all screws
Fasteners too short for tool . . . . . . . . . . . . . . . . . . . . . . . . . .Use only recommended fasteners
Bent fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Discontinue using these fasteners
Wrong size fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Use only recommended fasteners
Leaking head cap gasket . . . . . . . . . . . . . . . . . . . . . . . . . . .Tighten screws/replace gasket
Trigger valve O-ring cut/worn . . . . . . . . . . . . . . . . . . . . . . . .Replace O-ring
Broken/chipped driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Replace driver (check piston O-ring)
Dry/dirty magazine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Clean/lubricate use Bostitch Air Tool Lubricant
Worn magazine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Replace magazine
Fasteners jam in tool Driver channel worn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Replace nose
Wrong size fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Use only recommended fasteners
Bent fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Discontinue using these fasteners
Loose magazine/nose screws . . . . . . . . . . . . . . . . . . . . . . . .Tighten all screws
Broken/chipped driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Replace driver
LPF21PL-LPF33PT-LPF28WW_9R189680RC_BOS_MAN_JM_166762RevC_FSeries_Man.qxd 11/26/12 10:30 AM