Vilter Manufacturing Compressor VSG 181

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

Remove the rotating portion of the shaft seal

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

Clean the seal cover and prepare the carbon cartridge for installation

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

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 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 Thrust Bearing Removal

Remove gate rotor bearing housing

Removal of Thrust Bearings on VSG Units

Remove bolts from the clamping ring

Remove thrust bearing clamping ring

Remove thrust bearings from housing

Removal of Thrust Bearings on VSSG Units

Remove retaining ring from gate rotor support

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?