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Torque the impeller screw to a minimum of 175 ft-lb (237 Nm), maximum of 235 ft-lb (118 Nm). Do not allow the shaft
to rotate while tightening the lockscrew.
INSPECTION COVER AND WEAR PLATE
Re-grease O-ring when installing and use 2760 Loctite® (red), or equivalent, on the wear plate studs. Installation is
the reverse of removal.
ROTATING ASSEMBLY
Re-grease O-ring and install rotating assembly into volute. Installation is the reverse of removal. Upon installation,
the clearance between the suction cover and impeller needs to be verified. After sliding the rotating assembly back
into the volute, evenly tighten rotating element bearing housing fasteners until impeller lightly contacts wear plate.
The shaft will not rotate. Tighten bearing housing jack screws until .010 to .020 in (.25 to .51 mm) increase in clearance
is achieved.
The clearance can be determined by taking measurements of the gap between the pump casing and the bearing
housing when the impeller is making contact with the wear plate, then re-measure the same gap until the above
increase in clearance is achieved at each corner of the bearing housing.
Rotate shaft, making sure there isn’t any impeller/wear plate contact or rubbing. Tighten the jack screws at each
corner of the bearing housing (not too tight), then tighten the jack screw lock nuts to maintain setting position. Rotate
shaft to verify the shaft is free to rotate without the impeller rubbing on the wear plate. If the impeller continues to
rub on the wear plate, repeat adjustment procedure above until the shaft rotates freely.
INSPECTION COVER AND WEAR PLATE ADJUSTMENT
The wear plate clearance can be opened on the ES- series without removing the rotating assembly by loosening the
four hand knobs and tightening the four jack screws. Then re-tighten the hand knobs. The adjustment distance can
be measured by comparing the before and after gap between the adjustment flange and the volute casing.
PRESSURE RELIEF VALVE
The suction cover is equipped with a pressure relief valve to provide additional safety for the pump and operator.
4 Hand Knobs
4 Jack Screws
