Vilter Manufacturing Compressor VSG 201

Remove the snap ring and washer from the gate rotor assembly

Lift gate rotor blade assembly off the gate rotor support

Check damper pin and bushing for excessive wear

Replace damper pin and bushing if necessary

Install damper pin bushing (120) in gate rotor blade (111) from the back side of the blade

Place the blade assembly on the gate rotor support, locating damper over pin

Check rack to rack clamp and rack clamp spacer clearance on all four slide valves

Check torque of socket head cap screws

Is there excessive movement between the slide valve rack shafts and the rack?

Ensure jam nuts on the end of the slide valve rack shaft are tight

Check for loose or broken roll pins in gears

Look for any excessive wear on all moving parts and replace the worn parts

Prepare the compressor for servicing as outlined in section REMOVAL (All VSG)

Remove bolts holding the shaft seal cover and use jacking holes to assist in removing the cover

Was there oil drainage during cover removal?

Remove the rotating portion of the shaft seal

Remove the stationary portion of the shaft seal using a brass drift and hammer

Inspection of Slide Valve Assemblies

Prepare the compressor for servicing

Remove the gate rotor access covers and inspect the slide valve carriage

Remove the gate rotor support to check the clearance of the slide valve clamps

Inspect the clearance between capacity and volume slide valve clamps and slide valve carriage

Contact the factory if slide valves are worn beyond tolerances

Removal of Slide Valve Carriage Assemblies

Prepare the compressor for servicing

Determine which gate rotor support needs to be removed

Ensure the unit is shut down and de-pressurized before starting the procedure.

Main Rotor Bearing Float Measurement

Remove the coupling guard and center member from the coupling.

Attach a dial indicator to the compressor frame and zero the indicator.

Measure the movement by pushing the coupling towards the motor using a lever arm and fulcrum.

Re-zero the indicator and measure the movement by pushing the input shaft towards the compressor.

Add both readings to determine the total bearing float, which should not exceed 0.003 inches.

Gate Rotor Bearing Float Measurement