Pressure Relief Valve; Lubrication - Pioneer ES Series Operation & Maintenance Manual

housing fasteners until impeller lightly contacts wear plate. Note: the shaft will not rotate.
Tighten bearing housing jack screws until .010" to .020" increase in clearance is achieved.
.010" to .020" is the desired clearance between the impeller and wear plate.
This 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 jackscrew
lock nuts to maintain setting position. Rotate shaft to verify the shaft is free to rotate without
the impeller rubbing on the wear plate after adjustment. 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 (ES3 THROUGH ES6 )
The wear plate clearance can be opened on the ES- series
without removing the rotating assembly by loosening the
four (4) hand knobs and tightening the four (4) 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. Make sure the relief valve is set to 80 psi
DANGER!!!
It is recommended that the pressure relief valve assembly be replaced at each overhaul, or any
time the pump overheats and activates the valve. Periodically, the valve should be removed for
inspection and cleaning.

LUBRICATION

Proper lubrication is essential to maintain performance and to help ensure trouble free
operation.
Seal Assembly
Prior to starting the pump, remove the seal vent plug and fill the seal cavity with approximately
1 quart of ISO VG 32 viscosity grade 32 Turbine oil, so that the oil level is halfway in the level
sight gauge.
Bearings
The bearing housing was lubricated at the factory and should be maintained at the middle of the
sight gauge. Use an ISO viscosity grade 32 Turbine oil and fill through the air vent hole at the
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