MacDon PW7 Pick-Up Header - Manual (Page 71)

SECTION 7 – SERVICE
Form 169149 Revision E 65
Removal Procedure:
a) Raise the Hold down and engage hold
down safety locks.
b) Lower header/pickup completely to
ground, shut of combine and remove key.
c) Remove the four 5/16 inch x 3/4-inch
bolts securing drive belt shield and place
shield aside.
d) Remove the drive belt.
e) Detach the scroll plate guard by
removing the 1/4-inch x 1/2-inch bolts,
and washers.
f) Remove the 5/16-inch x 1-inch bolts and
washers securing the finger bar to the idler
and drive arms. Place the finger bar aside.
g) Remove the plug in the scroll plate.
h) Rotate the main gearbox pulley until the
shoulder bolt is centered in the small hole
in the scroll plate.
i) Remove the shoulder bolt, two bearings,
flat washer, spring lock washer and nut
from the follower arm.
j) Remove the 3/8-inch x 1 1/2 inch bolt
and nut clamping the follower arm to the
small gearbox shaft.
WARNING : Always use heat
protective gloves to prevent
burning your hands when
handling hot materials. Remove all
combustible materials from the vicinity of
an open flame. Have a fire extinguisher
nearby.
k) Rotate the drive rotor so that the shaft of the
gearbox being removed is centered in the
large scroll plate hole.
l) Heat the small gearbox jam nut with a
propane torch until a yellow flame appears.
This will indicate that the permanent thread-
locking compound is burned out.
m) Remove the 7/8-inch jam nut securing the
small gearbox to the drive end rotor.
n) Drive the small gearbox and finger bar drive
arm out of the drive end rotor. The follower
arm and key will also release. Be careful not
to damage the drive rotor bearings.
o) Inspect the bearings in the drive end rotor for
damage or wear. Replace if necessary.
p) Heat the 7/8-inch jam nut securing the finger
bar arm to the gearbox until a yellow flame
appears. This will indicate that the permanent
thread-locking compound is burned out.
Remove the nut.
q) Remove the 3/8-inch x 1 1/2 inch bolt and
detach the finger bar arm from the small
gearbox. Be sure not to lose the key.
Installation Procedure:
a) Place the finger bar idler arm on to the new
gearbox.
b) Reinstall the key, 3/8 UNC x 1 1/2 inch bolt
and nut into the finger bar idler arm.
c) Apply permanent thread locking compound
and tighten the 7/8-inch jam nut securing the
finger bar idler arm to the gearbox.
d) Rotate the drive end rotor until the gearbox
being replaced can be seen through the half
circle hole in the scroll plate.