MacDon PW7 Pick-Up Header - Manual (Page 66)

SECTION 7 – SERVICE
Form 169149 Revision E 60
C) Large Sprocket Removal
a) Remove the cotter pin, thrust washer and 1-
1/8 inch castle nut from the large sprocket
shaft.
b) Remove the two M12 bolts from the
sprocket.
c) Remove the sprocket. A puller may be
required to aid in the removal.
d) Clean and inspect components. Replace any
worn or damaged parts.
D) Large Sprocket Installation
a) Apply a coating of anti-seize compound to
the drive shaft and sprocket splines.
b) Place the sprocket onto the drive shaft.
c) Install the thrust washer and castle nut.
Tighten until sprocket has slid on as far as it
can go and the bearing is properly
sandwiched between the sprocket hub and
shaft shoulder. A torque of 55-65 Nm (41ft-
lb – 48ft-lb) should achieve this. Back off
castle nut a little.
d) Install the M12 bolts through the sprocket
and secure with the M12 Unitorque nuts.
Torque to 125-150 Nm (93ft-lb – 112ft-lb).
e) Torque the castle nut 360-400 Nm (265-295
ft-lb).
f) Install the cotter pin and bend end around
nut. If the castle nut hole does not align up
with the shaft hole tighten until alignment is
achieved. DO NOT loosen the nut to achieve
alignment.
E) Small Sprocket Removal
a) Remove the cotter pin, shim(s), washer
and M12 castle nut from the small
sprocket shaft.
b) Remove the sprocket. A puller may be
required to aid in the removal.
c) Clean and inspect components. Replace
any worn or damaged parts.
NOTE: Take note of the location of the
spacer and number of shims if or when
removing them from the shaft.
F) Small Sprocket Installation
a) Apply a coating of anti-seize compound
to the drive shaft and sprocket splines.
b) Install the spacer and shim(s) back onto
the shaft. Be sure to refer to the note in
the removal procedure.
c) Install the new sprocket onto the shaft.
NOTE: Set screws are not required for
this connection.
d) Align the small sprocket with the large
sprocket. The maximum tolerance is
±1.5mm (1/16 inch). If adjustment is
required use the shims located in front of
the sprocket. Place any unused shims
back between the sprocket and washer
for future use.
NOTE: Removal or installation of
additional shims may be required to
achieve alignment.
e) Place the additional shims, washer and
M12 castle nut onto the shaft and torque
to 55-65 Nm (41ft-lb – 48ft-lb).
g) Install the cotter pin and bend end
around nut. If the castle nut hole does
not align up with the shaft hole tighten
until alignment is achieved. DO NOT
loosen the nut to achieve alignment.