泽尼特集团 | 04 5月 2021

UNIQA - CHOPPER knife shim adjustment

Lift the pump by the top handle using a hoist of suitable capacity
(the weight of the pump is indicated on the rating plate)
Temporarily fix the knife with 3 screws at 120°
Loosen the knife lock screws WITHOUT completely undoing them
Make sure that the knife separates from the pump body by a few millimetres
Prepare the blades for the adjusting the shim
Insert the shims at each screw, starting with the thinner ones (0.5 mm)
Tighten the screws
Check with a thickness gauge that the shim between knife and blade is between 0.2 and 0.4 mm
Check the shim also between knife and impeller hub
Check that it is between 0.3 and 1.4 mm
If the shim adjustment is not correct, repeat the operation by inserting other shims to obtain different thicknesses
Once you have found the optimal shim, loosen the knife lock screws
Use a small slotted screwdriver to loosen the knife from the pump body
Tack the missing screws WITHOUT tightening them
Insert the same number and type of shims used for each screw
Fold the shims inwards so that they do not protrude
Tighten the knife lock screws by hand in a criss-cross order
Undo each screw in sequence and re-tighten them by applying Loctite 243 threadlocker or equivalent

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