MacDon PW7 Pick-Up Header - Manual (Page 75)

SECTION 7 – SERVICE
Form 169149 Revision E 69
u) Clean the gearbox housing lid area,
between gearbox and scroll plate, of
silicon or any other gasket material.
Pinion Gear Bearing Removal:
a) Remove the external snap ring from the
pinion gear shaft.
b) Remove the bearings and bushing from
the pinion gear shaft.
Crown Gear Bearing Removal:
a) Remove the internal snap ring in the
crown gear gearbox shaft.
b) Press out the bushing, two bearings and
output spacer from the main gearbox
housing.
B) Installation Procedure
Refer to the drawing at the beginning of this
section for part orientation.
NOTE:
If crown gear bearings are
being replaced perform the Crown Gear
Bearing Replacement procedure at the
end of this section before continuing.
a) Place #16 mechanical bushing on the
crown gear shaft.
b) Press the crown gear through the crown
gear bearings until the gear bottoms out.
NOTE: If you are replacing the pinion
gear or pinion gear bearings refer to the
Pinion Gear Bearing Replacement
procedure at the end of this section.
c) Press the pinion gear with the 2 bearings,
long input spacer, and snap ring into the
shaft of the pinion gear until the bearings
meet the shoulder on the main gearbox.
d) Install the (large) 244 Internal Snap Ring into
the gearbox housing.
e) Turn the shafts with your hand to ensure
proper alignment and prevent gear binding.
f) Apply approximately a 1/8 inch bead of
silicone around the four boltholes on the
scroll plate, than place the main gearbox in
position for bolting onto the scroll plate. See
the orientation drawing at the beginning of
this section for reference.
g) Apply approximately 1/8 inch of silicone to
the main gearbox housing lid and place onto
gearbox housing.
h) Install and tighten the four 3/8 inch x 4 1/2
inch bolts, flat washers and M10 spring lock
washers, securing the main gearbox housing
to the scroll plate.
i) Flip the gearbox upside down and place the
drive end rotor, spacers and key onto the end
of the crown gear shaft. When installing the
drive end rotor make sure the follower arms
are positioned so that they will follow the
direction of rotation. Refer to the arrow
marked earlier for direction of rotation.
j) Take the drive rotor attachment bolt, flat
washer, and spring lock washer and fasten
the drive end rotor to the crown gear shaft.
k) Secure the drive rotor attachment bolt to the
drive end rotor with permanent locking
compound and 18Ga wire.
l) Remove the grease plug on the main gearbox
cover. Fill with 14.4 Fluid Oz. (425ml or
0.112 U.S. gal) of NLGI Grade 000 extreme
pressure, semi-fluid lithium grease, such as
Mobilux EP 023, Petro-Can Precision XL
EP000, or Chevron Dura-Lith EP000. See
lubrication section for procedure.
m) Install and tighten the grease plug on the
gearbox cover.