Falk
®
Horizontal Shaft Backstops
•
Oil Seal Replacement
Type NRT • Sizes 70-180, 1070-1185, Model E
(Page 1 of 3)
Rexnord, 3001 W. Canal St., Milwaukee, WI 53208-4200, USA
568-131
Telephone: 414-342-3131 Fax: 414-937-4359
October 2014
www.rexnord.com NEW
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 ...................................................... 1-2
Backstop Removal ...............................................................1
Seal Replacement ...............................................................2
Backstop Installation ....................................................... 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 new model
cast iron and fabricated steel end covers. See Page 2.
CAUTION:
Remove all external loads from drive before
servicing drive or accessories. Do not damage inner cam 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
inner cam hub face 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 an 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 hub face 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.
COTTER PIN
TORQUE ARM PIN
END COVER
INNER CAM 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
