Winchester Repeating Arms 70 (Historic Manual) - Manual (Page 13)

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The safety mechanism — when it is engaged — is
designed to block the firing pin and disengage the sear to
prevent firing. However, this mechanism will not neces-
sarily prevent the accidental discharge of this firearm as a
result of jarring or abuse such as occurs when a firearm is
dropped.
I NSTALLING /R EMOVING THE B OLT
The bolt of your rifle may have been packed separately in
the carton in which your rifle is shipped. You will need to
insert the bolt into the action. In addition, it is always a
good idea to remove the bolt before cleaning.
Consequently, becoming familiar with removing and
inserting the bolt assembly quickly and easily is absolutely
essential.
M AKE SURE THE FIRING PIN IS COCKED
( FIRST INSTALLATION ) —
Before inserting the bolt for the first time, make sure the
firing pin is cocked. Under most conditions it should be
(and remain) cocked. When the firing pin is cocked, an
indicator is visible at the rear of the bolt (Refer back to
Figure 3). If the indicator is protruding from the bolt
sleeve a minimum of 1/8", the firing pin is cocked. If the
firing pin is not in the cocked position this means that the
bolt has been partially disassembled. To remedy this sim-
ply turn the rear section of the bolt — clockwise when
viewed from the indicator end — until the breech bolt
sleeve lock engages the notch in the breech bolt
(See Figure 7). On a new gun where surfaces are not yet
burnished from use, it may be difficult to rotate the bolt
sleeve by hand. If so, carefully grasp the lower section of
the firing pin in a padded vise, pull and turn.
IMPORTANT: FULLY UNLOAD YOUR RIFLE AS
EXPLAINED PREVIOUSLY. BE CERTAIN
FIGURE 7
Partially disassembled bolt.
Make sure the
sleeve lock is
engaged in the
notch.