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 5
(3) Shake the container of lubricant (supplied with kit) vigorously and poor it into a small shallow dish.
(4) Roll a bushing in the lubricant to coat it thoroughly. Press it into a socket (from the chamfered
end) to the dimension shown in Figure 4.
(5) Repeat step 4 until all new bushings are installed.
(6) Balance the complete coupling assembly to 1/2 inch-ounce (360 mg-m) minimum.
4) Coupling Installation.
WARNING
To prevent personal injury, keep fingers and hands clear of generator assembly until
the armature is block into place to prevent rotation.
CAUTION
Improper installation of the coupling assembly can result in serious damage to the
equipment. Follow these installation instructions exactly.
a) Cleaning.
Refer to Figure 5. It is VERY IMPORTANT that the shaft, the bore, and the outside of the split
bushing, and the tapered inside of the hub be thoroughly CLEANED FREE OF DIRT AND GRIT.
CAUTION
Do not lubricate any of the surfaces listed above. Lubrication of these surfaces can
cause the coupling to fail and damage the generator set. Slight traces of rust are
permissible on the surfaces.
b) Assembly.
(1) If an adapter ring must be replaced, remove the bolts that secure it to the flywheel. Discard the
old adapter ring and bolts. Install the new adapter ring (see Chapter 4) using the new socket head
bolts.
Torque all bolts to 100 ft-lbs (135 N-m).
The new adapter ring and bolts are included in the kit, when required.
(2) Refer to Figure 3. Assemble the bushing into the hub.
CAUTION
Make certain that only the bolts are lubricated, and that no lubricant is permitted to get
inside the bushing where the armature shaft will enter the bushing.
(3) Lubricate the three 3/8-16 bolts SPARINGLY and start them into the three (unthreaded) holes
finger-tight.
(4) Slide the generator armature as far as it will go toward the fan housing. Block the armature to
maintain this forward position throughout the installation procedure. Block the armature with a
wooden block or wedge, being careful not to damage any components of the armature or exciter.