Vilter Manufacturing Compressor VSSG 341

Ensure the unit is shut down and de-pressurized

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

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

Calculate the total indicator movement (bearing float)

Gate Rotor Bearing Float Measurement

Prepare the compressor for servicing

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

Remove the rotating portion of the shaft seal

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

Install the carbon cartridge part of the seal in the seal cover

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 to remove

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 in gate rotor blade from the back side

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

Is there any excessive wear on moving parts?