How To Use This Manual
This manual applies to standard Falk Type NRT backstops.
This manual provides detailed instructions on oil seal
replacement. Use the following Table of Contents to locate
required information.
Table of Contents
Oil Seal Replacement (Cast Iron End Covers). . . . . . . . . . . 1-2
Backstop Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Backstop Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Seal Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Backstop Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Backstop Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Oil Seal Replacement (Fabricated Steel End Covers). . . . . . 2-3
CAREFULLY FOLLOW THE INSTRUCTIONS IN THIS
MANUAL FOR OPTIMUM PERFORMANCE AND TROUBLE
FREE SERVICE.
Introduction
This manual covers oil seal replacement for both cast iron and
fabricated steel end covers. See Page 2 for oil seal
replacement for backstops with fabricated steel end covers.
BACKSTOP SEAL REPLACEMENT —
For Backstops
with Cast Iron End Covers, See Figure 3, Page2.
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.
Required Equipment
In addition to standard mechanic’s tools, the following
equipment is required: hoist, sling, torque wrench, dial
indicator with stand or depth micrometer and puller.
CAUTION:
Do not attempt to service or remove backstop before
removing load. When removing backstop from shaft, do not
apply heat to the backstop. Apply axial force to the hub of the
backstop only.
Backstop Removal
1. Drain and discard lubricant in an environmentally safe
method.
2. Remove oil sight gauge and breather assembly and insert
pipe plugs in cover holes.
3. Remove torque arm. Refer to Figure 1 for proper method
of supporting and lifting.
4. Reassemble torque arm pins in backstop and lock in place
with cotter pins for lifting.
5. If the backstop is furnished with a axial retaining collar(s),
loosen set screws and mounting bolts and remove collar.
Remove burrs on shaft caused by set screws.
6. Remove backstop from shaft. Apply force to the inner cam
of the backstop only. (Figure 1)
7. Thoroughly clean exterior of backstop with clean solvent to
prevent dirt from falling into the backstop when disassembling.
8. Position backstop on clean work surface with bore vertical.
Support lower end cover with wood blocks. (Figure 2)
Backstop Disassembly
9. Remove upper end cover bolts and end cover using
eyebolts as jackscrews for separation and lifting. (Figure 2)
Do not remove cam, bearings, stop lugs, springs or roller
cage assembly; removal will void applicable warranties.
10. Remove and note number of gaskets; discard old gaskets.
11. Clean outer race gasket area.
12. Remove grease from around the seals if the grease purge
feature has been used. Drive out seals and remove sealing
compound from mounting surface. Clean entire end cover
with clean non-flammable solvent and wipe dry.
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 1 of 3)
COTTER PIN
TORQUE ARM PIN
END COVER
CAM OR HUB FACE-
PUSH ON THIS FACE
WHEN INSTALLING
BACKSTOP ON SHAFT
BALANCE
POINT
NYLON
SLING
TORQUE ARM
CLAMPS TO PREVENT
SLING FROM SLIPPING
OFF "I" BEAM
NYLON SLING
Figure 1
LIFT
EYE BOLT IN
JACKSCREW HOLES
END COVER
INNER CAM
BEARING
OUTER RACE
Figure 2
