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Quinton Q55 - Replacement of a Seized Bearing on the Input Shaft

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Figure
5-1
Loosening
the
Variable Speed Belt
2. Remove
the
machined pulley and key.
3. Align
the
speed change spindle assembly
with
the
pin on
the
base
of
the
headframe.
4.
Replace
the
machined pulley
on
the
shaft
with
the
key
in
place.
5.
Replace
the
bearing
caps, narrow side
down, and place
the
bolts in
the
holes without
tightening
them.
6.
Install
an
undamaged input
shaft
assembly.
7.
Pry
open the
output
pulley slightly. Pull
on
the
variable
speed
belt
at
the
output
end
to
snap
the
belt
into
place.
8.
Tighten
the
bolts, installing
the
fan
on
the
center
bearing
cap.
9.
Snap
the
V4)elts on and align the
machined pulley with
the
pulley on
the
drive
motor
shaft.
Use
the
setscrew
on
the
machined pulley
to
make
the
adjustment.
10. Check
the
alignment
of
the
input
shaft.
The variable speed bel t should be
parallel
to
the
side
of
the
headframe.
WARNING
I
'".Js
Do
not
wear
loose
clothing around
rotating
machinery.
Hi
gh
vol
tage
. ,is
present
when
the
treadmill
cable
is
plugged in.
11.
Restore
power
to
the
treadmill
and
test
the
operation
of
the
new input
shaft.
Verify
that
the
treadmill
operates
through
the
full
range
of
speeds.
12. Unplug
the
treadmill
and
replace
the
hood
and handrail.
13.
If
using
the
Q2000
or
the
645 PTC,
perform
treadmill
calibration
(Steps 1, 2 and 7
of
Section
4.4
of
the
Q2000
Service
Manual
or
Section
6.2
of
the
645
PTe
Technical Manua!).
5.2.2.2 Replacement
of
a Seized Bearing
on
the
Input
Shaft
NOTE
Replacement
of
a loose
or
seized
throw-out
bearing
requires
special
equipment and should be
performed
at
the
factory.
1.
Perform
the
procedure in
Section
5.2.2.
2.
Inspect
the
shaft
for
damage.
If
the
shaft
is damaged,
obtain
a
replacement
input
shaft
assembly and
replace
the
shaft
using
the
procedure in
Section
5.2.2.1.
3.
If
you
are
replacing a
bearing
on
the
left
end
of
the
shaft,
remove
the
machined pulley
and key. Remove
the
left
bearing
cap
using a
gear
puller
or
press.
4.
If you
are
replacing a
bearing
on
the
right
end
of
the
shaft,
remove
the
bearing
cap
using
a
gear
puller
or
press.
5. Remove
the
bearing using a
gear
puller
or
press.
Refer
to
Step
2
if
the
input
shaft
is
damaged.
6.
Press a new bearing
onto
the
shaft
using
an arbor press.
7.
Apply
Loctite
Primer
T and
Loctite
RC
609
to
the
inside
of
the
bearing
cap
and
replace
the
bearing cap.
8.
Replace
the
machined pulley and key
if
5-5

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