Remington Power Tools 494 - Manual (Page 21)

21
101437
Buffer and Piston Replacement
!
WARNING ICON G 001
WARNING: Always unload a powder actuated tool before disassembling, replacing barrel,
cleaning, or assembling.
Breech
Receiver
Barrel Assembly
Slot in
Barrel
Tang Cap
Tang Spring
Tang
3. Reinsert barrel assembly slotted side down
into receiver. Turn tool over. With barrel
touching breech, insert tang and tang spring
into hole on bottom of receiver. Make sure
tang drops into the slot in the barrel. Screw on
tang cap completely. Tang cap must always be
kept tight to ensure proper operation of tang.
2. Place buffer, small end first, in muzzle cap.
Push new piston all the way into the barrel.
Screw muzzle cap into barrel.
TO REASSEMBLE:
IMPORTANT: Inspect piston ring and replace
if worn.
1. Install new piston ring onto piston (if required).
a) Remove old piston ring.
b) Install new ring. The piston ring consists of
three turns. Place one end into groove
and twist around piston until it is com-
pletely in groove.
IMPORTANT: This tool is equipped with a
piston buffer. The buffer stops the piston before
it makes contact with the muzzle cap. This
protects the barrel and muzzle cap. Inspect and
replace the buffer on a regular basis.
Worn Piston
Buffer
New Piston
Buffer
TO REPLACE BUFFER AND PISTON:
1. a) Remove tang cap, tang spring, and tang.
Slide barrel assembly from receiver.
b) Remove muzzle cap from barrel by un-
screwing counterclockwise.
Barrel Assembly
Muzzle Cap Barrel
Tang
Tang Spring
Tang Cap
Receiver
Piston
Barrel
Chamber
Piston Buffer
Barrel
c) Insert a rod or screwdriver into barrel
chamber and push piston and buffer out of
barrel.
Piston
Piston Ring
Barrel
Piston
Muzzle Cap
Piston Buffer
(Small End in Muzzle Cap)