Hobart 120CU20, Operation And Maintenance Manual With Illustrated Parts List

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OM-2228 / Operation and Maintenance Manual
120CU20 / Series 500120 / 400 Hz. Generator Set
October 15, 2013 Chapter 3-2
Page 2
Figure 2 Access to Coupling Bolts
(for removal or installation).
b) Remove Coupling Assembly.
WARNING
To prevent personal injury, keep fingers and hands clear of generator assembly until
the armature is block into place to prevent rotation.
(1) Refer to Figure 3. Using a socket wrench, remove all three of the 3/8-16 bolts that secure the
bushing to the hub.
(2) Using a 3/16-inch Allen wrench, loosen the setscrew in the bushing to release pressure on the
key.
(3) To separate the bushing from the hub, lubricate two of the 3/8-16 bolts and insert them into the
two threaded holes in the bushing flange. With socket wrench, screw these bolts into the bushing
such that the bushing pops loose from the hub, alternating from bolt to bolt.
(4) When the bushing is loose in the hub, use a mallet to GENTLY tap the bushing out of the hub.
(5) Slide the coupling assembly off the shaft and remove the key.
(6) Inspect the coupling assembly components carefully as follows:
a Check for deformed fan blades and damage to the disk.
b Check the rubber exposed at both ends of the bushings for signs of deterioration.
c Check hub and bushing for cracks, evidence of galling, and rust pits. Light rust is permissible
on the bushing and the tapered bore of the hub.