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6.01
BEARINGS AND SHAFT
An upper radial and a lower angular contact ball 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 that fills the motor housing. The bearing system shall be designed to enable proper
cutter alignment from shut off head to maximum load at 10 feet of TDH. The motor shaft shall be made of 300 series stainless steel and
have a minimum diameter of 0.670".
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 fluoroelastomer 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 an 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 that 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 four (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, 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. 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 freestanding unit. The legs shall be high enough to allow solids and long
stringy debris to enter the cutter assembly.
13.01 SERVICEABILITY
Components required for the repair of the pump shall be shipped within a period of 24 hours.
2484LSG_P8 R7/17/2019
7000 Apple Tree Avenue Bergen NY 14416
Copyright © Liberty Pumps, Inc. 2019
⯀
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Phone 800-543-2550
Fax 585-494-1839
All rights reserved.
Specifications subject to change without notice.
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Email Liberty@LibertyPumps.com
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Web www.LibertyPumps.com
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