Falk
®
Ultramite
®
• Installation & Maintenance Instructions
(Page 4 of 15)
Type UJ • Sizes 302 thru 312
GR3-016
08/20 (Supersedes 01/18)
866-REXNORD/866-739-6673 (Within the U.S.)
© Rexnord Corporation. All Rights Reserved.
414-643-2366 (Outside the U.S.)
INSTALLATION AND REMOVAL OF TYPE TA TAPER
®
BUSHING
Installation
1. The tapered bore hollow output shaft is designed for use
with a tapered bushing for mounting on a driven shaft with
a straight outside diameter. Refer to Table 3 for driven shaft
tolerances.
Table 3 — Driven Shaft Tolerances
★
Shaft Diameter — Inches
Maximum Undersize — Inches
Up to 1.500
.004
1.500 - 2.500 incl.
.005
2.500 - 4.000 incl.
.006
★
Millimeters = h 10 tolerance.
2. Rotate driven shaft so that keyway is in the 12 o’clock position.
THIN WALL BUSHING
(with keyway slot through bushing
wall) — With driven shaft keyway at the 12 o’clock position,
slide bushing assembly onto driven shaft, nut end first, and
position keyway slot over shaft keyway (bushing may have
to be pried open slightly). Insert drive key furnished with
bushing into shaft keyway. Proceed to Step 3.
THICK WALL BUSHING
(with separate internal and external
keyways) — Insert driven shaft key into driven shaft keyway.
If driven shaft has an open-ended keyway, stake keyway as
illustrated in Figure 5 to prevent axial dislocation of shaft key
under operating conditions. Slide bushing assembly onto
driven shaft (bushing may have to be pried open slightly).
Rotate shaft so that external keyway in bushing is at the 12
o’clock position. Insert drive key furnished with bushing into
bushing keyway. Proceed to Step 3.
Figure 5
3. Using a sling, safely lift gear drive so that hollow output shaft
is in the horizontal position. Rotate hollow shaft so that keyway
is aligned with driven shaft/bushing key. Position and slide
drive onto driven shaft taking care that driven shaft key seats
into hollow shaft keyway. DO NOT hammer or use excessive
force.
4. Thread bushing nut onto hollow shaft one to two turns. Note:
The bushing nut threads have been coated with an anti-seize
compound at the Factory. This compound should not be
removed. Before re-installing a previously used nut, recoat
the nut threads (only) with an anti-seize compound. KEEP
TAPERED SURFACE OF BUSHING AND HOLLOW SHAFT
BORE FREE FROM ALL ANTI-SEIZE OR LUBRICATING
COMPOUNDS.
5. Tighten nut as instructed in one of the following methods.
PREFERRED METHOD
— Using a spanner (Table 4) chain
or pipe wrench, tighten bushing nut to the torque value
specified in Table 4. Note: For applications where external
vibratory or transient loads may act on drive and cause
setscrews to become loose, apply Loctite 243 or equivalent to
threads of setscrew. Tighten setscrew on bushing nut.
ALTERNATE METHOD
— (Use this method when torque
cannot be measured.) Using a spanner (Table 4), chain or
pipe wrench, tighten bushing nut just until drive can no longer
be moved by hand axially on the driven shaft. Loosen nut
ONLY until it can be turned by hand but do not unseat the
taper. Retighten nut hand tight. Mark a spot on top of driven
shaft. Mark a spot on bushing nut 180° from the driven shaft
mark (90° CCW for Sizes 04UJ & 06UJ). Using a spanner
wrench, tighten nut CW one half turn until the two marks are
aligned (one quarter turn for Sizes 04UJ & 06UJ). Note: For
applications where external vibratory or transient loads may
act on drive and cause setscrew to become loose, apply
Loctite 243 or equivalent to threads of setscrew. Tighten
setscrew on bushing nut.
Table 4 — Spanner Wrench Type & Spanner Nut
Tightening Torque
DRIVE SIZE
Adjustable Hook Spanner Wrench
Spanner Nut
Tightening Torque
lb-ft (Nm)
Armstrong Tools
Williams
302, 304
34-307 (2.00" - 4.75")
474
83 (113)
306
34-307 (2.00" - 4.75")
474
83 (113)
307
34-307 (2.00" - 4.75")
474
167 (226)
308
34-310 (4.50" - 6.25")
474A
167 (226)
309
34-310 (4.50" - 6.25")
474A
250 (339)
310
34-310 (4.50" - 6.25")
474A
250 (339)
312
34-313 (6.12" - 8.75")
474B
250 (339)
Removal
WARNING:
Drive must be supported during removal process.
Use a sling around the gear drive and take up slack before
proceeding.
1. Loosen setscrew on bushing nut located at output end of
hollow shaft.
2. Use a spanner (Table 4) pipe or chain wrench to loosen
bushing nut. Initially, bushing nut will freely rotate counter
clockwise approximately 180° as the nut moves from
the locked position to the removal position. At this point
anticipate resistance which indicates unseating of the
bushing. Continue to turn bushing nut until it is free from the
hollow shaft.
3. Prepare drive for lifting by disconnecting torque arm at drive
end. Slide drive from bushing. Note: Bushing can be left in
place or removed, as required. If bushing will not slide off of
shaft, insert a small pry bar into split of bushing and pry split
open slightly to loosen bushing and remove from shaft.