Emerson VSM, VSR, VSS service manual Service, Compressor Inspection, Bearing Check

Service

Top View

Rotor Being Pushed By

Use Of Lever

Direction of rotor movement. Axial force at coupling

to be 250-300lbs.

Rigidly attach dial indicator.
Position it on the axis of the
compressor.
Force to be determined	Small wooden block or fulcrum.
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.

Side View

Showing gate rotor bearing float

being measured.

Wooden block to prevent

Direction of rotor movement. damge to gate rotor blade. Axial force at gate rotor to be

250 to 300 lbs.

Rigidly attach	Force to be determined
dial indicator.	by length of level arm.
Use bolt for fulcrum.

Side View

Showing gate rotor bearing float

being measured.

Wooden block to prevent

Direction of rotor movement. damge to gate rotor blade. Axial force at gate rotor to be

250 to 300 lbs.

Rigidly attach	Force to be determined
dial indicator.	by length of level arm.
Use bolt for fulcrum.

BEARING CHECK

CAUTION

When taking the measurements, do not exceed 250 to 300 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 compres- sor coupling half and push the coupling towards the motor (note measurement).

TABLE.1 MAXIMUM BEARING FLOAT

	MAIN	GATE
Bearing Float	0.003”	0.002”
Maximum Force	250 to 300	50 to 100
	Lbs.	Lbs.

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).

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