Remington 490 - Manual (Page 21)

21 101274
PROBLEM
Piston hangs
out of muzzle.
Overdriven fas-
tener.
Piston jammed.
Expended load
will not extract.
Reduction or
loss of power
Tool does not
completely de-
press.
POSSIBLE
CAUSE
Tool overdriven.
Piston not properly
assembled in rela-
tion to barrel screw.
Broken piston.
Excessive power.
Overdriving of fas-
tener (see above).
Dirty or damaged
chamber.
Broken ejector.
Pins being used are
over 2
1 /
2
" long.
Piston not returning
to full rear position.
Worn piston ring or
broken piston.
Misassembled or
damaged breech
and firing pin parts.
REMEDY
Tap piston on a hard sur-
face until piston is
pushed back into the
muzzle (see
Overdriven
Fastener, below).
Remove barrel assem-
bly. Follow instructions
for barrel replacement
(see pages 18 and 19).
Replace all damaged or
missing parts.
Replace barrel assem-
bly or take tool to your
distributor.
Change either to next
lower powder load or next
longer length fastener.
Remove barrel assem-
bly. Follow instructions
for barrel replacement
(see pages 18 and 19).
Replace other parts if
damaged.
Clean chamber. If loads
will not chamber with
slip-fit or extraction diffi-
culties continue, take
tool to your distributor.
Replace barrel assem-
bly or take tool to your
distributor.
Use proper pin size.
Barrel must be snapped
to the full extended posi-
tion to properly position
piston against breech.
Replace barrel assem-
bly or take tool to your
distributor.
Remove breech and
check all parts for correct
fit assembly.
Troubleshooting Guide