- 5 -
INTRODUCTION
GENERAL
This manual contains installation, operation, cleaning, and repair instructions, with parts list, for
PR, PRE, PRED pumps manufactured by Tri-Clover Inc. of Kenosha, Wisconsin. It also provides
a troubleshooting chart to aid in determining pump malfunctions.
DESCRIPTION
The PR, PRE and PRED Series pump units are generally mounted on base plates which
accommodate the pump units and the drive motors.
The pump units are comprised of two sections, the pump frame section and the fluid head section.
The drive shaft and pump shaft with their respective o-rings, bearings, seal and retaining rings are
located in the inner pump frame section.
The timing gears are keyed to the shafts. Axial movement of the gears is kept to a minimum by
shaft shoulders and retaining rings.
Lip seals on the shafts and o-ring seals on the frame bores, prevent leakage of timing gear
lubricating oil into the pump bearing grease chamber.
Sealing of the fluid head along the shafts is accomplished by rotary seals, consisting of stationary
stainless steel seal rings with carbon inserts, stainless steel wear rings which are broached to fit
the shaft splines, and o-rings which seal off any pumpage.
An optional cover containing a pressure relief valve provides a positive means of protecting the
processing equipment and piping from excessive head pressures.
Rotors are available in two materials - rubber and metal. Rubber and metal rotors are available in
double and four lobe design.
The drive motors, used in conjunction with the PR, PRE and PRED Series Pumps are not covered
in this manual. Refer to the individual motor or drive manufacturer for service data.
WARNING
Before servicing pump, disconnect electrical
power source.
GENERAL INFORMATION
