SECTION 6: MAINTENANCE
CAS40P 40 CFM / 100 PSIG
PAGE - 48
®
An Oshkosh Corporation Company
Figure 6-14: Drive Sheave (Pulley) Alignment Tolerance Check Measurement Points
1
2
3
4
5
A
B
90°
STEP #3:
Once alignment tolerance has been confirmed for
Step
#1
and
Step #2
, rotate the sheaves 90° in order
to take a second set of measurements.
STEP #7 (if necessary)
:
Loosen and reset the mounting bolts for the bushings of both
sheaves, torquing the bolts to specifications given below (
NOTE
:
Before resetting the bushings, remove
all
belt tension):
A
: For compressor bushing torque 5/16-18 bolts to 180 in-lbs.
B
: For motor bushing torque 1/4-20 bolts to 108 in-lbs.
Once the sheaves have been re-set and torqued, repeat
Steps #1
through
#5
to confirm alignment at all check points.
NOTE
Should the process given in Step #7 not yield correct
measurements after all bushing resets and sheave
alignment steps have been performed, contact the
IMT Service Department.
STEP #1:
Place a straight edge, long enough to span over both the
compressor and motor sheaves, flush against both sheaves’
face surfaces, just
above
the mounting screws.
Measure for sheave alignment gaps as per
Figure 6-15
.
Measurements should falls within the allowable 1/16”
limitation range.
STEP #2:
Place the straight edge over both the compressor and motor sheaves, flush against both sheave
face surfaces, but
below
the mounting screws. Measure for alignment gaps as per
Figure 6-15
.
Adjust the motor sheave lateral position (refer to
Section 6.4.10.2
) until both top and bottom measurements taken
in
Step #1
and
Step #2
are within the acceptable tolerance range given in
Figure 6-15
. Tighten the motor base
frame bolt(s), but do not torque yet.
STEP #4:
Take a new measurement as given in
Step #1
.
STEP #5:
Take a new measurement as given in
Step #2
.
STEP #6:
If measurements are within tolerlances, torque the 1/2-13”
motor base frame bolts (x 4) to 80 ft-lbs.
IF SHEAVES ARE OUT OF TOLERANCE RANGE:
Sheaves in correct alignment should be within the tolerance range given in
Figure 6-15
. Should
the second measurements taken in
Steps #4
and
#5
not yield correct tolerance ranges, there may be an
alignment issue with the mounting hubs and/or bushings for either or both sheaves. Refer to
Step #7
.
Manual #99905382 Rev 02
(JUNE 2018)