Hobart 60CU20 Operation And Maintenance Manual With Illustrated Parts List page 132

OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
(3) Install the Machine Key
a Clean the machine key thoroughly. All mounting surfaces must be free of rust, corrosion, oil,
grease, etc.
b Apply LOCQUIC primer, No. 47-56 grade T to SIDES of machine key. Do not over prime. A
thin film is best. Allow to dry three to four minutes.
c Apply a thin coating of LOCTITE, No. 242 adhesive to SIDES of keyways in shaft and
armature. Be certain to remove any excess from mounting surfaces on shaft and bore of
armature.
NOTE: Application of "Loctite" is to compensate for any looseness in machine key and keyway (up to
0.005 inch). Manufacturers of LOCTITE and other recommended products are listed below.
When exciter armature removal is for the replacement of bearings and no kit is involved, be sure that
LOCTITE is used (No. 242 is recommended), which is a milder adhesive than that recommended in
the manual.
When kits are involved, the correct grade of LOCTITE is included in the Kit.
The application of NEVER-SEEZ to the shaft and armature bore is NOT recommended because there
is a danger that it may mix with and contaminate the LOCTITE. Application of NEVER-SEEZ will be
at the customer's risk. LOCTITE can lose its adhesive and tightening properties if contaminated by
rust preventatives, oil, or other lubricants and antirust products.
Recommended Products Manufacturers:
•
"LOCQUIC" No. 47-56, Primer Grade T
•
"LOCTITE" No. 40-31, Retaining Compound, Manufactured by Loctite Corporation, Newington,
Connecticut 06111
•
"NEVER-SEEZ" No. NSBT-8 (8 oz. can), Manufactured by Never-Seez Compound Corporation,
Broadview, Illinois 60153
•
"NOCO10" Varnish No. T-211 (clear, air dry), Manufactured by Sterling Division of Reichhold
Chemical Incorporated, Marysville, Pennsylvania 17053
d Apply LOCTITE, No. 242 to SIDES of new type threaded machine key. A thin film 0.005 to
0.010 inch thick is adequate and desirable.
e Ensure keyways in the generator armature shaft and exciter armature are aligned.
f Insert UNTHREADED end of key in keyways, and then tap lightly until threaded end is flush
with end of shaft.
(4) Secure the exciter armature and key retainer on generator shaft with the M12-1.75 hex head cap
screw.
CAUTION
Allow at least 6 hours for complete cure and set up of Loctite before operating machine.
May 2, 2013 Chapter 3-1
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