Zenit Group | 29 Mar 2018
UNIQA - ZUG V WET
Assembly - Complete mechanical seal dismantling and oil change procedure for Zenit UNIQA submersible pumps.
Models with vortex impeller (ZUG V) in WET version. High pressure mechanical seals.
- Fit the O-ring into place on the flange and grease
- Fit the flange onto the shaft, with a suitable driver
- Secure the flange with the snap ring, making sure it is perfectly snug
- Wet the counterface with alcohol and fit it, using a suitable driver
- Blow with compressed air to remove all traces of dirt and lubricate the counterface
- Clean the surfaces of the seal with a paper towel
- Wet the seal in alcohol and fit it onto the shaft, using a suitable driver
- Fix the seal with the snap ring
- Fit the shim ring on the rotating side
- Fit the casing onto the shaft and tighten the fixing stud bolts, securing them with Loctite 243 threadlocker
- Grease the O-ring and fit it into place on the rotating side
- Fit the seal onto the shaft, paying attention to the positions of the locator slots
- Wet the counterface with alcohol and fit it into place in the pump plate, using a suitable driver
- Fit the counterface locking ring and fit the screws without fully tightening them. Use Loctite 243 threadlocker
- Fit the O-ring into its seat
- Fit the oil cage and tighten the counterface locking ring screws
- Fold the wings of the oil cage inward, taking care that they do not interfere with rotation of the seal
- Fit the O-ring into the seat in the pump plate
- Blow with compressed air to remove all traces of dirt and lubricate the counterface
- Fit the O-rings into the oil chamber screw seats
- Fit the pump plate onto the oil chamber and fix it with the screws
- Tighten at least two opposite screws by hand to fit it gradually into position.
- Fit a cap into one oil chamber hole and a compressed air fitting into the other
- Pour in a little alcohol to check for leaks
- Test for tightness at a maximum pressure of 1 bar
- Remove the cap and fitting
- Grease the V-ring and fit it onto the shaft
- Screw a male eye-bolt onto the shaft and lift the motor with a hoist
- Refit the handle so that the cable will not be crushed when handling the motor
- Lay the motor part horizontal on the workbench with the oil chamber caps upward
- Tighten the handle screws
- Fill the chamber with oil. Refer to the documentation for the correct amount
- Seal the oil chamber with the caps
- Place the impeller on a firm support and connect it to the drive shaft
- Secure the impeller with the fixing screw. Use Loctite 270 threadlocker
- Spray the pump plate O-ring with spray lubricant
- With a hoist, lift the motor by the handle and connect it to the pump body
- Fix the pump body with the screws