Group 34, Uprights
34-4-2 •
Carriage and Upright Roller Clearance Checks and Shim Adjustments
SM 765, Nov ’06
are canted (tilted) to allow the side face to bear properly
on the web.
Rail flange wear can cause excess play between the lift
rollers and the rail flange. The only way to correct this is
to install oversize rollers-only one size of which is avail-
able. If oversize rollers were fitted previously, the only
remedy for excessive front-to-back play is to replace the
rail set. (carriage middle rollers are always standard-size
rollers; see “Oversize Rollers” later in this Section for
details on roller replacement.)
The gap between the roller “side” and the web of adjacent
rail set affects the side-to-side motion of the upright-
which should be as small as possible without causing the
sliding segments to bind. The same is true of the internal
thrust rollers.
You check the performance effect of the lift roller side
clearance and internal thrust roller clearance by means of
the load test described in Section 3. To evaluate with cer-
tainty that the clearance is excessive, you perform the
checks given below.
To correct excessive lift roller side clearance, you add
shims as described later in this Section. To correct internal
thrust roller clearance, you adjust thrust roller position as
described later in this Section.
a. Target is the desired gap after reshimming the roller set.
b. Allowed is the acceptable gap when checking roller set.
c. Internal side thrust rollers should extend 0.25-0.50mm(0.01-0.02 in)
beyond #1 rollers.
d. Ideal is same as final measured gap at minimum width point of rail set.
e. Measured at top of inner rail.
Rail Flange
Rail Web
Gap
Side Face
Of Clearance
Lift Roller
Shoulder
Roller Side Clearance Chart
Roller Side Clearance Chart
Web Area Gap at Mimimumm Span of Rail Set Gap at Maximum Span of Rail Set
Roller Set# Forming Gap
Target
a
Allowed
b
Target
a
Allowed
b
(mm) (in) (mm) (in) (mm) (in) (mm) (in)
#1
Front, Inner rail
c
0.5-1.5 0.02-0.06 0.05-1.25 0.02-0.05 d d 2.25 0-0.09
#2 Front, Inner rail 0-0.75 0-0.03
0-1.5
e
0-0.06 d d 2.25 0-0.09
#3 Back, Inner rail 0-0.75 0-0.03 0-1.0 0-0.04 d d 2.25 0-0.09
#4 Back, Inner rail 0-0.75 0-0.03 0-1.0 0-0.04 d d 2.25 0-0.09
#5 Back, Intermd rail 0-0.75 0-0.03 0-1.0 0-0.04 d d 2.25 0-0.09
#6 Back, Intermd rail 0-0.75 0-0.03 0-1.0 0-0.04 d d 2.25 0-0.09
#7 Back, Outer rail 0-0.75 0-0.03 0-1.0 0-0.04 d d 2.25 0-0.09
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