Compressor Inspection; Compressor Shaft Bearing Clearance Inspections; Determine Maximum Applied Force; Main Rotor Bearing Axial Clearance Inspection - Emerson VILTER VSS Installation, Operation And Service Manual

Section 5 • Maintenance/Service

Compressor Inspection

Compressor Shaft Bearing Clearance
Inspections
If clearance measurements are out of tolerance, contact
Vilter Technical Support for further assistance.
CAUTION
When taking the measurements, do not exceed
300 to 500 lbs of force at point of contact or
damage may result to the bearings.

Determine Maximum Applied Force

To determine maximum applied force, take maximum
applied force at hub/shaft multiplied by length of A
and divide by length B. This is the maximum force that
should be applied on the lever.
(Applied Force x A)/B = Applied Force (Maximum)
So, using a 36" (or 1 m) lever with pivot space of 6" (or
15 cm) would make the maximum applied force to be 60
lbf (or 235 N). Calculation is as follows:
(300 lbf x 6")/30" = 60 lbf (Max. Applied Force)
(1335 N x 15 cm)/85 cm = 235 N (Max. Applied Force)
Applied
Force
Pivot Point
As a quick reference, Table 5-3 shows maximum applied
forces for 36" lever with 6" pivot for all compressor
models.
VSS/VSR/VSM/VSH/VSSH Compressor • Installation, Operation and Service Manual • Emerson • 35391S
Force at
Hub/Shaft
Lever
Wooden Block
or Fulcrum

Main Rotor Bearing Axial Clearance Inspection

To inspect bearing axial clearance, proceed with the fol-
lowing steps:
1. Remove center member, see appropriate Drive
Coupling Replacement procedure.
2. Install dial indicator to the compressor frame and
zero indicator, see Figure 5-8.
3. Place lever arm and fulcrum behind compressor
coupling half and push the coupling towards the
motor. Record measurement.
4. Re-zero indicator, now position the fulcrum on the
motor and use the lever arm to push the input shaft
towards the compressor. Record measurement
5. Add both measurements. If measurement is out
of allowable tolerance shown in Table 5-3, the
bearing may need to be replaced. Contact Vilter
Technical Support.
Top View
Shaft being pushed by use of lever.
Direction of
shaft movement.
Rigidly attach dial indicator.
Position on axis of compressor.
Applied Force
Top View
Shaft being pushed by use of lever.
Rigidly attach dial indicator.
Position on axis of compressor.
Direction of
shaft movement.
Wooden block
or fulcrum
Figure 5-8. Bearing Axial Clearance
Inspection
Small wooden block or fulcrum.
Applied Force
5 – 13
TM