40
NOTE:
Tighten the right side bearing lock nut first since it provides axial location of rotor.
20.
RIGHT LOWER BEARING ASSEMBLY - ONLY
Torque bearing lock nut to 400 ft. lbs. A bearing lock washer tab must align with a slot in bearing
lock nut.
NOTE:
It is recommended to check internal radial clearance of bearings with a feeler gauge.
a.
Rotate rotor several times to seat bearing rollers. Right side bearing should be mounted
with minimum 0.0015” of internal radial clearance.
b.
Using a feeler gauge, insert a 0.0015” blade between two unloaded rollers at top of
bearing. Rotate rotor until blade is over a roller. The feeler gauge blade should pull out
with minimal force. Continue to rotate rotor and check in four different places.
c.
If feeler gauge blade cannot be pulled from bearing at all four locations the bearing lock
nut is too tight. Remove bearing lock nut and pull withdrawal sleeve out slightly. Repeat
process at less torque.
NOTE:
If a minimum of 300 ft. lbs. of torque cannot be achieved, contact your local Digga dealer.
d.
Remember a bearing lock washer tab must align with a slot in bearing lock nut.
CHECK FOR RECOMMENDED INTERNAL
RADIAL CLEARANCE AT TOP OFBEARING
INSERT FEELER GAUGE BLADE HERE
AND ROTATE BEARING
TO CHECK FOR
RECOMMENDED CLEARANCE.
20.
LEFT LOWER BEARING ASSEMBLY - ONLY
Torque bearing lock nut to 500 ft. lbs.
A bearing lock washer tab must align with a slot in
bearing lock nut.
Check gap between bearing and shoulder on left
lower bearing housing. A gap of 3.3mm min. to
13.46mm max. should remain to allow for thermal
expansion and contraction of rotor shaft.
NOTE:
It is recommended to check internal radial clearance
of bearings with a feeler gauge
.
3.3mm (MIN)
13.46mm (MAX)
BEARING
SHOULDER
LEFT
BEARING
HOUSING
BEARING
MAINTENANCE & SERVICE
QUALIFIED TECHNICIAN MAINTENANCE
PM-000102-A OCTOBER 2017
39
Summary of Contents for Magnum II Series
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