MacDon PW7 Pick-Up Header - Manual (Page 74)

SECTION 7 – SERVICE
Form 169149 Revision E 68
A) Removal Procedure
Refer to the drawing at the beginning of this
section for part reference.
a) Raise the hold down up and engage the hold
down 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 aside.
d) Remove the drive belt.
e) Loosen pulley set screws, and remove the
pulley. Do not lose the key.
f) Remove the 5/16-inch x 1-inch bolts securing
the finger bars to the idler and drive rotors,
and remove finger bars.
g) Mark the scroll plate with an arrow showing
the direction of rotation.
CAUTION : The gearbox assembly
is heavy. Provide proper support
prior to removing the four bolts
attaching the gearbox to the frame. Keep all
body parts away from any potentially
hazardous areas.
h) Remove the four 3/8 inch x 1 1/4 inch bolts
attaching the main gearbox to the main
frame. Remove the two on the pinion side
first so that the belt guard bracket could be
removed and placed out of the way.
i) Remove and place the detached drive
gearbox unit in a spacious work area.
j) Detach the scroll plate guard by removing the
1/4-inch x 1/2-inch bolts, and washers.
k) Flip the gearbox unit upside down and
remove the wire that secures the drive
rotor attachment bolt to the drive end
rotor.
l) Remove the 1/2-inch x 1 1/2 inch drive
rotor attachment bolt, flat washer, and
M12 spring lock washer from the drive
rotor.
m) Press the crown gear shaft out of the
drive end rotor. This will separate the
drive end rotor from the scroll plate and
main gearbox housing. Do not lose the
key & spacers.
n) Flip the gearbox over and remove the
3/8-inch x 4 1/2 inch bolts, flat washers,
and M10 spring lock washers attaching
the square gearbox cover and scroll plate
to the gearbox housing. Remove the
cover, scroll plate, and place aside.
o) Flush out all existing grease from the
gearbox housing.
p) Remove the internal snap ring from the
gearbox pinion housing.
q) Drive out the pinion gear, complete with
bearing and spacer from the pinion-
bearing cup.
r) Inspect pinion bearings for free and
smooth rotation, and bearing seals for
dents and damages. Replace bearings if
necessary. See Pinion Bearing Removal
below.
s) Press out the crown gear.
t) Inspect crown bearings for free and
smooth rotation, and bearing seals for
dents and damages. Replace bearings if
necessary. See Crown Bearing Removal
below.