8 inc Howitzer manual.pdf - Replica Plans and Blueprints

13
die of ilie fu·ing block. Unscrew the firing-medmn:ism block, slide the
used primer out of the slot in the primer seat plug, insert n.new primer,
and after the breech :is closed screw the block into the firing-mechanism
housing. The fuing-mechn.nism handle :is automatically locked by the
safety latch when the handle is rotated to its home position.
The firing-mechanism block is interchangeable with the firingmechanism
block used on the following gnns:
155 mm. howitzer, model of 1918 (Schneider).
155 mm. howitzer, model of 1917 (Bethlehem).
155 mm. gm1, model of 1918 (Filloux).
240 mm. howitzer, model of 1918 (Schneider).
TO REMOVE BREECH MECHA.NISM.
Before removing the mechanism, the breechblock must be opened
and swnng into the loading position.
OBTURATOR.
Unscrew firing mechanism block from the firing mechanism housing.
RemO\·c securing pin from the ret!:t:ining ring and wiilidraw the safety
plunger housing. Unscrew the firing mechanism housing and remove
obturator spring. Wiilidraw obturator spindle, pad, and rings as a
unit from the front end of the breechblock.
BREECHBLOCK.
Insert a screw driver in slot of securing pin of the retaining plate,
press in the pin and partially reYolve it by means of the screw driver
tmtil the indicating l!>l-Tow on the pin corresponds with the middle of
the word ''dismantle" on the breechblock, then 11ithdraw the breechblock
from the front of the carrier.
ROLLER.
Remove the seeming pin and roller axis pin, and withdraw the
roller.
BREECH JIIECHAN!SM LEVER.
Remove the securing pin and nut from the crartk shaft, and withdraw
the breech mechanism lever.
BREECH OPERATING LEVER BEARING, CRANl{ SHAFT, AND CROSSHEAD.
Remove the securing pin and nut of the lever beruing seeming
screw, and withdraw the securing screw. Withdraw the bearing and
crank shaft from the canier; at the same time, fmm inside the carrier,
remove the crosshead from the inner end of the crank shaft.