in the seal case 180° apart. Control the angle of the drill
as illustrated in Figure 5 to prevent damage to the cam.
5. Insert two #10-.750” sheet metal screws into the seal
leaving .500” (13mm) of the screw protruding from the
seal face. DO NOT drive the screw more than .250”
(6mm) beyond seal face or bearing damage may occur
(inner seal only). Use a claw type pry bar under the screw
head as shown in Figure 6, and lift the seal out. Remove
all chips. Use a magnet to remove the chips that fall into
the bore. Flush the drive to remove chips from the bearing.
Remove Permatex from housing bore.
6. Install one seal at a time. Coat both seal outside diameters
with Permatex #3 or equivalent sealant.
7.
INNER SEAL
— Position the inner seal squarely in the
bearing cage with the garter spring positioned per Figure 7.
8. Place a square ended cylindrical tool against the seal and
press or lightly tap the tool (not the seal) until the seal is
seated against the shoulder. (Figure 7)
9. Check seal runout with a depth micrometer, dial indicator
or bar micrometer. Runout must not exceed .010”
(0.25mm) TIR. Hand pack the grease cavity formed by the
gap between the inner seal and outer seal with NLG
I
#2
grease before installing outer seal in Step 10.
10.
OUTER SEAL
— Install the outer seal per Steps 7 thru 9
and to depth shown in Figure 7.
CAUTION:
An important part of the Falk NRT backstop
manufacturing process is the full load and overrunning testing
with specially instrumented equipment. Consequently, return
NRT backstops to Rexnord for repair and full load testing.
Except for replacement of oil seals, NRT backstops should not
be dismantled or repaired in the field. If seals are to be
replaced,it is important that the cam and roller assemblies not
be removed from the outer race. Removal will void applicable
warranties.
When writing to Rexnord Service Department concerning
required service, state nature of problem and give complete
date from backstop nameplate; M.O. number, size, date, etc.
Rexnord Industries, LLC, Geared Products, P.O. Box 492, Zip 53201-0492
568-130
3001 W. Canal St., Zip 53208-4200, Milwaukee, WI USA Telephone : 414-342-3131
February 2009
Fax: 414-937-4359 e-mail: [email protected] web: www.rexnord.com
Supersedes 11-01
Falk™ Horizontal Shaft Backstops
•
Oil Seal Replacement
Type NRT
•
Sizes 70-180, 1070-1185
(Page 3 of 3)
Figure 5
Figure 6
GARTER
SPRINGS
INNER SEAL
SHOULDER
SIZES 1070 THRU 1185
.31”(8mm)
APPROX. CLEARANCE
LABYRINTH
COVER
Figure 7
