Vilter Manufacturing Compressor VSSG 291

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

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 part numbers on the inner race to the outer race and press the bearing race onto the gate rotor support

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

Install the snap ring retainer in the housing with the bevel facing away from the roller bearing

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 0.003 inches?

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.

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?