Vilter Manufacturing Compressor VSG 401

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

Do not exceed 300 to 500 Lbs. of force at point of contact when taking measurements.

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 and note the measurement.

Measure the movement by pushing the input shaft towards the compressor and note the measurement.

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

Check torque of socket head cap screws (Nm)

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

Is there any excessive wear on moving parts?

Inspection of Slide Valve Assemblies

Prepare the compressor for servicing

Remove the gate rotor access covers and inspect

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 removal

Prepare the compressor for servicing.

Follow the appropriate instructions to remove control actuator.

Remove components securing mounting plate to manifold

Remove the command shaft and mounting plate from the compressor.

Command Shaft Assembly Installation

Install the command shaft assembly with a new o-ring on the manifold.

Ensure the command shaft tongue is engaged in the cross shaft slot.

Rotate the bearing housing so the vent holes point down.

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

Ensure the bushing is fully seated