Vilter Manufacturing Compressor VSG 101

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

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.

Add both readings to determine the total bearing float.

Is the total bearing float within the 0.003” limit?

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

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

Remove bolts (281) holding the shaft seal cover (218) and use threaded jacking holes to assist in removing the cover.

Check for oil drainage as the cover is removed.

Remove the rotating portion of the shaft seal (219C).

Remove oil seal (230) from cover.

Remove the stationary portion of the shaft seal (219B) from the seal cover using a brass drift and hammer.

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?

Gate Rotor Roller Bearing Removal

Refer to section REMOVAL (All VSG)

Remove the snap ring (131) retaining the roller bearing in the bearing housing

Remove the roller bearing (125) from the bearing housing (112)

Use a bearing puller to remove the roller bearing race (125) from the gate rotor support (110)

Gate Rotor Roller Bearing Installation

Match up the part numbers on the inner race to the part numbers on the outer race

Press the bearing race (numbers visible) onto the gate rotor support

Install the outer bearing into the bearing housing ensuring numbers match the inner race