MacDon D50, Operator'S Manual

Page: 154 / 298

169441
142
Revision D
12. Wrap a chain around the knifehead and pull out the knife.
4.7.3 Removing Knifehead Bearing
The knifehead bearing, seals, and greasing interval protect the knifehead from the forces of the knife drive output arm. The
seals and bearing require inspection and, when worn
—
replacement to prevent damage.
DANGER
To prevent bodily injury or death from the unexpected start-up or fall of a raised machine, always stop the engine and
remove the key before leaving the operator
’
s seat, and always engage the safety props before going under the
machine for any reason.
WARNING
Stand to the rear of the knife during removal to reduce the risk of injury from the cutting edges. Wear heavy gloves
when handling a knife.
IMPORTANT:
Repeat this procedure for each knife.
1. Shut down the engine, and remove the key from the ignition.
2. Remove the knife. For instructions, refer to 4.7.2 Removing Knife, page 141 .
NOTE:
Because the bearing is being replaced, it is not necessary to wrap the knifehead to protect the bearing.
1003865
A
B
C
D
E
Figure 4.47: Knifehead Bearing Assembly
3. Use a flat-ended tool with the same approximate diameter
as pin (A), and tap seal (B), bearing (C), plug (D), and
O-ring (E) from the underside of the knifehead.
NOTE:
Seal (B) can be replaced without removing the bearing.
When changing the seal, check the pin and needle bearing
for wear and replace if necessary.
MAINTENANCE AND SERVICING