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PN-51210 (Rev. 7/98)
1. Remove two 3/8" retaining bolts holding access cover to main frame
assembly. Tilt access cover over to allow rotor access.
2. Remove large belt guard (three 5/16" bolts).
3. Loosen bolts on hydraulic pump and remove hydraulic pump belt.
Remove the bushing and pulley from the rotor shaft using the push bolts
from the bushing.
4. Lift belt idler pulley off drive belt and remove belt from pulleys. Remove
the bushing and pulley from the rotor shaft using the push bolts from the
bushing.
WARNING: The rotor assembly has a lock mechanism. Use the lock
mechanism at all times when working on the rotor assembly. Remove plastic
bearing cover under the chipper chute. There is a hole in the rotor jack shaft
and a matching hole in the bracket mounted to the rotor bearing front side.
Install a punch through the rotor shaft and bracket to lock the rotor in place.
5. Remove four 1/2" bolts on each rotor bearing and remove punch used to
lock the rotor.
6. Lift the rotor assembly completely out of the frame using an overhead
hoist or lifting device. The complete rotor assembly weighs 275 lbs.
7. Remove 3/8" bolts and collar from front once the rotor assembly is out
of the frame. Remove both bearings with a puller and place new
bearings on rotor shaft. Replace collar.
8. Return the complete rotor assembly to the chipper frame with an
overhead hoist or lifting device.
9. Slide rotor back until front collar is tight against the front bearing. Lock
the front bearing and install four 1/2" bolts on each bearing to secure
them to the frame. Tighten bolts to 75 ft. lbs. Check and adjust chipper
anvil if needed. Lock rear bearing.
10. Slide rear collar on shaft against rear bearing. Slide bushing onto shaft
with flange against collar and lock bushing to shaft. Attach large pulley
to bushing. Replace drive belt on pulleys and lower belt idler. Check
alignment of pulleys and adjust engine if needed.
11. Close cover and replace bolts.
12. Replace hydraulic pump bushing and pulley. Replace hydraulic pump
belt. Readjust hydraulic pump belt tension by sliding the hydraulic pump
in the mounting slots. Tighten bolts.
13. Replace belt guard and resume operation.
14. Start tractor engine and engage PTO drive clutch (see tractor owner's
manual). Increase engine speed to rated PTO RPM Position. Test unit,
readjust pulleys, and belt tension if needed.
S
ERVICE
AND
M
AINTENANCE
Repairing or Replacing Rotor Bearings