Emerson VSG Manual page 31

Top View
Rotor Being Pushed By
Use Of Lever
Direction of rotor movement.
Axial force at coupling
to be 300-500lbs.
Rigidly attach dial indicator.
Position it on the axis of the
compressor.
Force to be determined
by length of level arm.
Top View
Rotor Being Pushed in the
opposite direction by use of a lever.
Direction of rotor movement.
Axial force at coupling
to be 300-500lbs.
Rigidly attach dial
indicator.
Position it on the
axis of the
compressor.
Small wooden block
or fulcrum.
Force to be determined
by length of level arm.
Side View
Showing gate rotor bearing float
being measured.
Direction of rotor movement.
Axial force at gate rotor to be
200 to 300 lbs.
Rigidly attach
dial indicator.
Use bolt for fulcrum.
Service
Small wooden block or fulcrum.
Wooden block to prevent
damge to gate rotor blade.
Force to be determined
by length of level arm.
COMPRESSOR INSPECTION
The Vilter Single Screw Compressor is designed for
long periods of trouble free operation with a mini-
mum of maintenance. However, a yearly inspection
is recommended so any irregular wear is noted and
rectified. At this time, the bearing float is measured
for the main rotor and gate rotors.
The following are the procedures used in measuring
the main rotor and gate rotor bearing float.
BEARING CHECK
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
A) Shut down and de-pressurize the unit.
B) Main rotor bearing float.
1) Remove the coupling guard, then remove the
center member from the coupling.
2) Attach a dial indicator to the compressor
frame as shown and zero indicator. Place a
lever arm and fulcrum behind the compressor
coupling half and push the coupling towards
the motor (note measurement).
TABLE.1 MAXIMUM BEARING FLOAT
Bearing Float
Maximum Force 300 to 500 200 to 300
3) Re-Zero indicator, now position the fulcrum
on the motor and use the lever arm to push
the input shaft towards the compressor (note
measurement).
MAIN GATE
0.003" 0.002"
Lbs. Lbs.
31