Seal Replacement
13. Check seal surface for any damage prior to installing new
seals. Install one seal at a time. Coat both seal outside
diameters with Permatex #3 or equivalent sealant.
14.
OUTER SEAL
— Position the outer seal squarely in the end
cover with the garter spring positioned per Figure 3.
NOTE: Use seal with smaller outer diameter as outer seal
for Sizes 130 thru 170 and Sizes 1130 thru 1175.
15. 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 3)
16. Check seal runout with a depth micrometer, dial indicator
or bar micrometer as shown in Figure 4. Runout must not
exceed .010” (0.25mm) TIR.
17.
INNER SEAL
— Install the inner seal per Steps 15 and 16
and as follows:
Sizes 70 thru 120 & Sizes 1070 thru 1125
— Install to
depth shown in Figure 3.
Sizes 130 thru 170 & Sizes 1130 thru 1175
— Seat as
shown in Figure 3.
Size 180 & Sizes 1180 thru 1185
— Seals have built-in
spacer lugs. Lugs of inner seal are to be in contact with
case of outer seal.
Backstop Assembly
18.Coat seal lips and chamber between seals with NLG
I
#2
grease. Hand pack grease cavity between inner and outer
seal with NLG
I
#2 grease. Reinstall end cover and the
same number of new gaskets as noted in Step 10. Do not
use gaskets made from substitute material; use only the
new gaskets furnished by the Factory.
19.Reinstall end cover fasteners but do not tighten; this will
facilitate torque arm pin assembly.
20.Turn backstop over and replace seals in opposite end
cover per Steps 9 thru 19.
21.Align end covers by inserting torque arm pins. Tighten all
end cover fasteners to the torque shown in Table 1.
Backstop Installation
22.Refer to Manual 568-110 for backstop installation, oil sight
gauge assembly and lubrication recommendations.
BACKSTOP SEAL REPLACEMENT —
For Backstops
with Fabricated Steel End Covers, See Figures 4,5, and 6 on
Page 3.
CAUTION:
Remove all external loads from drive before
servicing drive or accessories. Do not damage cam or hub
face: new seals will leak if seal contacting surface is marred.
Do not use abrasive material on seal contacting surface.
1. To prevent dirt from falling into the backstop, thoroughly
clean exterior of backstop with clean non-flammable
solvent.
2. If removing backstop, refer to BACKSTOP REMOVAL on
Page 1.
3. Remove labyrinth shroud (See Figure 7, Page 3) from
backstop. Clean cam or hub face with solvent and remove
all sharp edges. Use a sharp center punch to lightly punch
the seal case as a guide for the drill. Check seal surface
for any damage prior to installing new seals.
4. Wrap several turns of tape around the drill approximately
.250” (6mm) from the drill point to prevent the drill from
entering too deeply into the housing and damaging the
bearing (inner seal only). Grease or magnetize the drill to
help retain the chips. Drill two .125” (3mm) diameter holes
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
Oil Seal Replacement
•
Falk™ Horizontal Shaft Backstops
(Page 2 of 3)
Sizes 70-180, 1070-1185
•
Types NRT
GARTER
SPRINGS
OUTER
SEAL
SEAT
.12” (3mm) APPROX.
CLEARANCE
SIZES 70 THRU 120
SIZES 1070 THRU 1125
SIZES 130 THRU 170
SIZES 1130 THRU 1175
GARTER
SPRINGS
OUTER
S EAL
S EAT
INNER SEAL SEAT
INNER SEAL (SEAT
AGAINST LUG)
GARTER
SPRINGS
SIZE 180
SIZES 1180/1185
OUTER
S EAL
S EAT
INNER
CAM
INNER
CAM
INNER
CAM
Figure 3
PARALLEL
SEAL
END COVER
DEPTH
MICROMETER
Figure 4
TABLE 1 — End Cover Fastener
Tightening Torque
Backstop
Size
Grade 8
Cap screw Size
Tightening Torque
H
lb-in (Nm)
70 & 1070/1075
.500”-13UNC
1,325(150)
80 & 1080/1085
.500”-13UNC
1,325(150)
90 & 1090/1095
.500”-13UNC
1,325(150)
100 & 1100/1105
.500”-13UNC
1,325(150)
110 & 1110/1115
.625”-11UNC
2,550(290)
120 & 1120/1125
.625”-11UNC
2,550(290)
130 & 1130/1135
.750”-10UNC
4,425(500)
140 & 1140/1145
.750”-10UNC
4,425(500)
150 & 1150/1155
.875”-9UNC
7,100(800)
160 & 1160/1165
.875”-9UNC
7,100(800)
170 & 1170/1175
.875”-9UNC
7,100(800)
180 & 1180/1185
1.000”-8UNC
10,400(1180)
H
Do not oil fasteners and locknuts or use Loctite compound.
