MacDon R85 Rotary Disc 13 Foot - Manual (Page 92)

MAINTENANCE AND SERVICING
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90
Revision C
7.5.7 Spindles
To prevent damaging the cutterbar and drive
systems, each disc is attached to a spindle which
incorporates a key that shears if the disc contacts
a large stone, a stump, or other large object. In
the event of a sheared key, the disc stops
rotating, but remains attached to the spindle.
Replace the key as follows:
DANGER
Stop engine, and remove key from ignition
before leaving Operator's seat for any reason.
A child or even a pet could engage an idling
machine.
a. Lower header to ground, shut off engine, and
remove key.
b. Open cutterbar doors.
CAUTION
Cutter blades have two cutting edges.
Exercise caution when working around the
blades. Blades are sharp, and can cause
serious injury. Wear gloves when handling
blades.
c. Remove disc (A) from failed spindle. Refer to
Section 7.5.3.1 Disc Removal/Installation.
d. Using a 34 mm socket wrench, remove nut (B)
and washer (C) from spindle.
e. Install four M12 x 60 mm long bolts (D) into holes
in plate (E).
f. Use bolts (D) as jacking screws to remove plate
(E) from gear. Remove bolts from plate.
g. Pry out failed key (F) from gear (G) and plate (E).
h. Thoroughly clean metal debris from disassembled
components and cutterbar.
(continued next page)
D
E
F
G
A
B
C