Echo 77412 Owners Manual v.1 - Manual (Page 21)

Page 19 4.5" BearCat Chipper Operator's Manual
SERVICE AND MAINTENANCE
5.8 REPLACING ROTOR BEARINGS.
REMOVING THE OLD BEARINGS
1. Slide the chipper disk into the chipper housing.
2. As the rotor shaft slides through the hole in the chipper
housing, slide the new back bearing onto the rotor shaft.
3. Tighten the two 1/2" x 1-1/2" bolts and 1/2" centerlock
nuts securing the back bearing to the chipper housing.
Torque to 75 Ft-lb.
4. Slide a snap ring, front bearing and another snap ring
onto the rotor shaft.
5. Tighten the two setscrews securing the front bearing to
the rotor shaft.
6. Tighten the two setscrews located on both the front and
back bearings securing the bearings to the rotor shaft.
7. Replace the rotor sheave and tighten the three bolts
into the correct holes to secure the sheave to the rotor
shaft.
8. Ensure the chipper engagement lever is in the chipping
position
9. Replace the belt. Using a straight edge, check the belt
alignment. The rotor sheave and the engine sheave must
be flush.
10. For models 77412 and 77412S, reinstall the belt guide.
11. Move the chipper engagement lever to the start position
and reinstall the idler pulley.
12. Replace the belt guard and resume operation.
INSTALLING THE NEW BEARINGS
1. Move the chipper engagement lever to the start posi-
tion.
2. Shut engine off.
3. Disconnect battery cables.
4. Remove the belt guard. Two 5/16" x 1" bolts are located
on each side of the belt guard.
5. Remove the idler pulley.
6. Move the chipper engagement lever to the chipping po-
sition.
7. For models 77412 and 77412S, the belt guard will have
to be removed. To do this, remove the 1/2" bolt attach-
ing the belt guide to the rotor bearing and the 5/16" bolt
attaching the belt guide to the engine.
8. Remove the belt.
9. To remove the rotor sheave, do the following:
9a. Remove the three bolts securing the rotor sheave to
the rotor shaft.
9b. Reinstall the bolts into the second set of holes. As
the bolts are tightened, the sheave will be pushed
off the rotor shaft.
10. To remove the front bearing, do the following:
10a. Remove the snap ring.
10b. Loosen the setscrews securing the front bearing
to the rotor shaft.
10c. Remove the two 1/2" x 1-1/2" bolts and 1/2"
centerlock nuts holding the front bearing to the
chipper housing.
10d. Slide the front bearing off the rotor shaft.
10e. Remove the second snap ring.
11. To remove the back bearing do the following:
11a. Remove the seven 5/16" nylock nuts and wash-
ers securing the disk cover to the chipper hous-
ing.
It is extremely important to slide the rotor assembly for-
ward to remove any existing play in the rotor assembly.
Failure to do so could result in the chipper blades strik-
ing the chipping anvil which could result in serious injury
or death.
WARNING
WARNING
The chipping blades are sharp! Use care when working
on the machine to avoid injury.
The rotor assembly has a lock mechanism (Section 5.1).
When working on the rotor assembly, use the lock mecha-
nism at all times.
WARNING
11b. Loosen the setscrews securing the back bearing
to the rotor shaft.
11c. Remove the two 1/2" x 1-1/2" bolts and 1/2"
centerlock nuts holding the back bearing to the
chipper housing.
11d. Slide the chipper disk out from the chipper hous-
ing until the bearing slides off the rotor shaft.