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378-206
Rexnord
January 2019
3001 W. Canal St., Milwaukee, WI 53208-4200 USA
Supersedes 07-15
Telephone:
414-342-3131
Fax:
414-937-4359
www.rexnord.com
(PN-212395)
Appendix B
•
Falk Quadrive Shaft-Mounted Drives Model A
(Page 30 of 53)
Sizes 5407-5608
Backstop Installation — Sizes 5407 & 5415
INTRODUCTION
The following instructions apply to INSTALLATION ONLY
of internal backstops in horizontal drives, sizes 5407 thru
5415 double reduction .
WARNING
: Axial float measurement of the high-speed
shaft must be within the following range: .001 inch preload
to .001 inch float. Refer to Section III (Drive Reassembly)
Item 6 (Bearing Adjustment) for proper instructions on
bearing settings and measuring axial float. If backstop
is to be replaced, the high-speed shaft must also be
replaced. Refer to instructions regarding high-speed shaft
replacement in Section III.
Remove all external loads from system before servicing
drive or accessories, and lock out starting switch of prime
mover .
LUBRICANT
PETROLEUM-BASED LUBRICANTS
— Use R & O type
lubricants which do not contain extreme pressure (EP)
additives if the drive is equipped with an internal backstop .
CAUTION
: Do not use EP lubricants or lubricant
formulations including sulfur, phosphorus, chlorine, lead
derivatives, graphite or molybdenum disulfides in drives
equipped with internal backstops. Refer to Appendix A
for proper selection of lubricants. Use of an improper
lubricant will contribute to premature wear or malfunction
of the backstop.
SYNTHETIC LUBRICANTS
— Synthetic lubricants of the
polyalphaolefin type may be used in drives with internal
backstops .
Before installing backstop, check direction of free rotation
(overrunning) indicated by the arrow etched on each side
of the backstop .
BACKSTOP APPLICATION
Backstops are designed to prevent reverse rotation
or backrun without backlash in applications such as
conveyors, bucket elevators, fans, rotary pumps and
kilns . Backstops are not approved for use on systems that
are designed for handling of people such as elevators,
manlifts, ski tows and ski lifts . DO NOT use a backstop as a
substitute for a brake .
INDEXING
DO NOT use the backstop for indexing applications .
The backstop is designed to prevent reverse rotation
five times or less in eight hours, with one minute or
more in overrunning direction between backstopping
load applications . If backstopping operations are more
frequent, or the time between operations is less than one
minute, the backstop is classified as an indexing device
and must be referred to the Factory .
INSTALLATION
1 . Drain oil from the drive . If a backstop is being added
to an existing drive, for size 5415, remove and discard
the original end cover, Ref . #18; fasteners, Ref . #37; and
gasket, Figure 1 . For size 5407, remove and discard the
original end cover, Ref . #18; gasket and four short studs .
Install longer studs, Ref . #38, provided with the kit . The
hex nuts removed from original shaft cover assembly
will be required for reassembly .
REF. #27 OR 28 GASKET
REF. # 18
END COVER
REF. #37
FASTENERS
REF. # 1A3
PINION & SHAFT
Figure 1
2 . If existing backstop is being replaced for sizes 5407 &
5415J14, remove cover, Ref . #19; backstop, Ref . #5A1;
spacer, Ref . #5A2; and gasket from backstop cage .
For size 5415J25, remove cover, Ref . #19; gasket and
backstop cage, Ref . #20, from housing . Remove two
retaining rings from bore of backstop cage . Remove
backstop, Ref #5A1, from cage . For all drive sizes, note
direction of rotation of high-speed shaft for proper
reassembly . Refer to Section II for shaft and backstop
inspection .
3 . Remove backstop, Ref . #5A1, from the kit and wipe off
excess lubricant .
4 .
SIZE 5407 (FIGURE 2)
— Assemble backstop cage,
Ref . #20, onto studs using one new .015” (0 .381 mm)
shim-gasket, Ref . #30, against the housing . Slide the
spacer, Ref . #5A2, into the backstop cage up against
the bearing cup . Apply oil to the O .D . of the high-speed
shaft backstop journal and the sprags inside of the
backstop . Insert key Ref #5A4 into backstop keyway .
Align the key with the keyway in the backstop cage and
carefully slide the backstop into the bore while slowly
rotating the high-speed shaft . The shaft will only rotate
in one direction . DO NOT FORCE OR HAMMER; this
may damage the shaft or misalign the sprags .
Check operation of backstop by turning high-speed
shaft in required direction of rotation by hand . If
the shaft does not rotate in the required direction,
remove backstop, reverse it and reinsert it into bore as
instructed above . Proceed to Step 9 .