Falk Quadrive Shaft Mounted Drives Model A • Appendix B
Sizes 5107-5315 (Page 33 of 52)
Rexnord (PN-2128394) 378-200
3001 W. Canal St., Milwaukee, WI 53208-4200 USA January 2019
Telephone: 414-342-3131 Fax: 414-937-4359 www.rexnord.com Supersedes 04-17
Backstop Installation
Rotate high-speed shaft in the required direction
of rotation and then reverse the rotation to lock up
the backstop. Observe the position of the sprags.
All sprags must be engaged and lay in the same
relative position around the shaft. If the sprags are not
uniformly positioned, lightly tap the backstop cage to
centralize all the sprags around the shaft and cage. If
sprags cannot be uniformly positioned in this manner,
remove the backstop and run a finger around the
sprags in the overrunning direction. Reinstall backstop
as instructed in preceding steps.
Check the position of the sprags several times by
overrunning and locking the sprags. If all sprags move
uniformly, hold the backstop in the locked position and
proceed to the next assembly step.
4. FINAL ASSEMBLY — EXTERNAL PARTS: On drive
sizes 5107J and 5115J, install one gasket Ref. #23,
cover spacer Ref. #17, spider Ref. #5A5, second
gasket Ref. #23, and backstop end cover Ref. #16
(size 5115J uses stamped end cover removed in Step
1). Oil feed slots in gaskets and cover spacer must
be aligned with the housing backstop oil feed hole to
provide proper lubrication for the backstop. Refer to
figures 3A and 3B. Install fasteners with lock washers
and cross tighten to 3.5 lb-ft (4,7 Nm) torque.
On drive sizes 5203 thru 5315, install one gasket Ref.
#23 and backstop end cover Ref. #27 to drive housing
(one gasket Ref. #23, cover spacer Ref. #17, second
gasket Ref. #23, and end cover Ref. #16 on drive size
5207J). Size 5207J uses end cover and fasteners
removed in Step 1. Oil feed holes or slots in gaskets,
cover spacer (5207J), and cast shaft covers must
be aligned with the housing backstop oil feed hole
to provide proper lubrication to the backstop. Install
fasteners with lock washers and cross tighten to
8 lb-ft (11 Nm) torque.
Clean housing surface for rotation and WARNING
labels. Affix the rotation indicator label next to
the high-speed shaft extension to indicate the
free direction of rotation (Figure 4). Fill to oil level
specified in Section I with oil specified in Appendix
A. Check motor for correct rotation before completing
connection to drive.
DRIVE EQUIPPED
WITH INTERNAL BACKSTOP
H.S. SHAFT ROTATION
DO NOT USE EXTREME
PRESSURE LUBRICANTS
Rexnord Industries, LLC
BACKSTOP OIL
FEED HOLE
INSTALLED BACKSTOP
(WITH RETAINING
RING)
GASKET
END COVER REF.#16
SPIDER 5A5
EXTERNAL HOUSING
SPACER WITH GASKET
ON BOTH SIDES REF.#17
BACKSTOP OIL
FEED HOLE
INSTALLED BACKSTOP
(WITH SPACER AND
RETAINING RING
ON 5115J25)
OIL FEED
SLOT
EXTERNAL HOUSING SPACER
WITH GASKET ON BOTH SIDES
REF.#17
SPIDER 5A5
STAMPED ( REF.#16) END COVER
5107J WITH BACKSTOP
5115J WITH BACKSTOP
Figure 3A
Figure 3B
Figure 4
BACKSTOP REPLACEMENT — IN EXISTING
DRIVES WITH DAMAGED BACKSTOPS
5. DISASSEMBLY— EXTERNAL PARTS: Drain oil from
drive and remove backstop cover fasteners, backstop
end cover, gasket(s), cover spacer (where used),
and spider (where used). Save all metallic parts for
possible reuse.
6. BACKSTOP REMOVAL: Remove backstop from drive
and discard, keep backstop key, backstop spacer
(5115J25 only), and backstop retaining rings (where
used) for possible reuse. Remove housing spacer
from drive housing backstop bore and keep for reuse.
NOTE: Complete drive disassembly is required to
replace the high-speed shaft, refer to Sections II and
III of this manual for disassembly, parts replacement,
and reassembly of the basic drive.
7. BACKSTOP PREPARATION, BACKSTOP
INSTALLATION AND EXTERNAL PARTS
ASSEMBLY: Refer to Sections 2, 3, and 4 of this
appendix for preparation of the backstop, installation
of the backstop in the rebuilt drive, assembly of the
external parts associated with the backstop to the
drive and preparation of the drive for service.
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