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4 5.01 MOTORS Single phase motors shall be oil filled,capacitor start/capacitor run,class B insulated NEMA B design,rated for continuous duty. At maximum load the winding temperature shall not exceed 135 degrees C unsubmerged.Since air filled motors are not capable of dissipating heat they shall not be considered equal.The pump motor shall have an integral thermal overload switch in the windings for protecting the motor.The capacitor circuit shall be mounted internally in the pump.Single phase motors shall have an integral solid state starting circuit switch for switching the start winding off. 6.01 BEARINGS AND SHAFT An upper radial and lower thrust bearing shall be required.The upper bearing shall be a single ball/race type bearing.The lower bearing shall be an angular contact heavy duty ball/race type bearing,designed to handle axial grinder pump thrust loads.Both bearings shall be permanently lubricated by the oil,which fills the motor housing.The bearing system shall be designed to enable proper cutter alignment from shut off head to maximum load at 10'of TDH.The motor shaft shall be made of 300 or 400 series stainless steel and have a minimum diameter of.670". 7.01 SEALS The pump shall have a dual seal arrangement consisting of a lower and upper seal to protect the motor from the pumping liquid.The lower seal shall be a FKM fluoroelastomer OR Buna N molded double lip seal,designed to exclude foreign material away from the main upper seal.The upper seal shall be a unitized silicon carbide hard face seal with stainless steel housings and spring equal to Crane Type T-6a.The motor plate/housing interface shall be sealed with a Buna-N o-ring. 8.01 IMPELLER The impeller shall be a investment cast stainless steel impeller,with pump out vanes on the back shroud to keep debris away from the seal area.It shall be keyed and bolted to the motor shaft. 9.01 CUTTER MECHANISM The cutter and plate shall consist of 440 stainless steel with a Rockwell C hardness of 55-60.The stationary cutter plate shall have specially designed orifices through it,which enable the slurry to flow through the pump housing at an equalized pressure and velocity.The stationary cutter shall consist of V shapes to maximize cutting action and arc shape exclusion slots to outwardly eject debris from under the rotary cutter.The rotary cutter shall have(4)blades and be designed with a recessed area behind the cutting edge to prevent the accumulation and binding of any material between rotary cutter and the stationary cutter.The cutting system must incorporate close tolerances for optimum performance. Ring or radial cutters,or those that grind on the outside circumference of shall not be considered equal. 10.01 CONTROLS All single phase units can be supplied with CSA and UL approved automatic wide angle tilt float switches.The switches shall be equipped with piggy back style plug that allows the pump to be operated manually without the removal of the pump in the event that a switch becomes inoperable. Manual Pumps are operable by means of a pump control panel. 11.01 PAINT The exterior of the casting shall be protected with Powder Coat paint. 12.01 SUPPORT The pump shall have cast iron support legs,enabling it to be a free standing unit.The legs will be high enough to allow solids and long stringy debris to enter the cutter assembly. 2448LSG_P7 R4/2/2012 ®Copyright 2012 Liberty Pumps Inc. All rights reserved. Specifications subject to change without notice.