SERVICE MANUAL
MOYNO
®
2000 PUMPS
G1 Flanged Models
1-1. INTRODUCTION
1-2. GENERAL
The Moyno® 2000 Pump is the culmination of over 70
years of experience in manufacturing and marketing fluids
handling equipment. This rugged pump has been engineered
to be the most reliable product ever sold under the Moyno
name. The pump has been painstakingly tested to assure
consistent performance in the most difficult of applications. It
represents the next generation of the world’s most versatile
pump.
The Moyno 2000 Pump is a progressing cavity pump. A
single helical rotor rolling eccentrically in the double helix
of the stator creates the pumping action. The rotor in
conjunction with the stator forms a series of sealed cavities
180 degrees apart. As the rotor turns, the cavities progress
from the suction to the discharge. As one cavity diminishes,
the opposing cavity increases at exactly the same rate. Thus
the sum of the two discharges is a constant volume. The
result is a pulsation-free positive displacement flow utilizing
no valves.
1-3. NAMEPLATE DATA
The pump nameplate, located on the bearing housing,
contains important information relating to the operation and
servicing of the pump. This information includes the direction
of rotation arrow and the pump model and serial numbers
(see fig. 1-1). The pump model number must be used for
reference when ordering spare parts.
1-4. Pump Rotation. A rotation arrow on the nameplate
indicates the direction of rotation. Normal rotation of Moyno
2000 pumps is clockwise, when viewed from the driven end
of the pump.
1-5. Model Number. The pump model number consists of
three component parts: Frame Designation, Type
Designation and a Trim Code. A typical model number for
example, might be 1G065G1 CDQ AAA, as shown on the
nameplate in fig. 1-1.
1-6. Frame Designation. The Moyno 2000 is modular
in concept allowing for optimal matching of drive ends and
pump elements (rotor and stator) to meet the requirements
of the application. The seven or more characters in the frame
Figure 1-1. Typical nameplate showing rotation arrow,
model and manufacturing serial numbers.
designation describe the particular combination of drive end and
pump elements, as well as other construction details of your
pump.
The first character in the frame designation, always a number,
indicates the number of stages of the pumping elements.
The second character is always a letter (E through K) and
indicates the drive end size.
The third, fourth and fifth characters are numbers indicating
the theoretical capability of the pumping elements per 100
revolutions on water. Sometimes the fifth letter is followed by the
letter “E”, which denotes that the pumping element is our Ultra
Pro 23 geometry.
The sixth character represents the type of universal joint
utilized. The letter G indicates a gear type joint. Other
configurations may be indicated by the letters P or F.
The seventh character, a number, indicates the type of suction
housing. Flanged suction port pumps are designated by the
numeral “1,” open throat pumps by the numeral “2” and open
throat pumps with a bridge breaker option by the numeral “3.”
1-7. Type Designation. Following the Frame Designation is
the Type Designation, a series of three letters describing the
materials from which the pump is constructed.
MOYNO
®
2000 PUMPS
Page: 1
Date: June 2002
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