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DANGER
Chipper Flange Bearing
Performing maintenance with the power source ON may
result in unexpected operation of the machine and may
cause serious injury or death. Turn OFF and lock out the
power source before servicing.
The chipper flange bearings support the chipper drum shaft and should be
greased according to the maintenance schedule.
Before performing maintenance on the chipper bearings:
1. Follow steps 1-4 in Chipping Cycle Section to shut-down the machine.
2. Inspect the chipper drum shaft. Ensure that it is smooth, free of any nicks
or cuts, straight and clean.
3. Inspect the bearing for contamination.
4. Protect the bearing from exposure to dirt or moisture.
5. Do not remove slushing compound. This protects and lubricates the
bearing and is also compatible with standard greases.
6. Unbolt the bearing housing and lift off the top to obtain access to the
bearing assembly. Lift the chipper drum and shaft from the chipper
drum housing.
To Maintain the Bearings:
1. Slide the inner grease slinger ring onto the drum shaft.
2. Slide the tapered sleeve onto the drum shaft. The threaded end should
be toward the outside.
3. Slide the bearing onto tapered sleeve. Match the inner taper on the
bearing.
4. Slide the washer onto the drum shaft. The tabs should be pointed away
from the bearing.
5. Install the nut and washer.
6. Tighten nut until it is snug against the bearing. Leave enough space to
install the expansion ring in step 9.
7. Install outer grease slinger. Repeat steps 2 - 8 for the opposite side.
8. Place the drum into the chipper drum housing ensuring that the grease
slingers on both sides mate with the grooves in the bottom bearing
housing. Check that they turn easily when full weight of drum is resting
on the housings.
9. Install the expansion ring into the bearing housing between
the housing and bearing (on the drive side of the bearing).
Rotate and push down until the ring meets the bottom of the bearing
housing and the ends are equal on the side of the shaft.
10. With the chipper drum weight on the bearings, use a feeler gauge to
take an initial reading of the internal clearance between the bearing
rollers and the top of the bearing. Record the reading.
11. With a spanner wrench, turn the nut in a clockwise rotation. This will
drive the bearing onto the tapered sleeve and decrease the internal
clearance between the bearing rollers and the top of the bearing.
Continue turning the nut until the internal clearance is reduced to the
distance specified for the shaft diameter (e.g.: internal clearance for a
2 5/16” diameter shaft is .0018” / .0025, see table 4.6).
12. On the idler side of the drum, pull the bearing to the outside groove
of the housing before tightening nut. That way when tightening the
bearing it will move towards the middle of the housing.
13. Fill bottom of bearing housing with EP2 rated grease so it is level with the
top.
After performing maintenance on the chipper bearings:
1. Replace the top of the bearing housing.
General Maintenance • Chipper Flange Bearing
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