Section:
MOYNO
®
500 PUMPS
Page:
1 of 4
Date:
March 1, 1998
SERVICE MANUAL
MOYNO
®
500 PUMPS
300 Series Motorized
35650, 35651, 35652, 36750, 36751, and 36752 Model
DESIGN FEATURES
Housing:
Cast iron/316 SS
Pump Rotor:
AISI 416 stainless steel/ANSI 316 SS
Pump Stator:
NBR
Seal:
NBR (Nitrile)
Motor Shaft:
Mechanical (carbon/ceramic)
Motor:
3 phase; 1-1/2 HP, 208/230/460V for Models
35650 and 35651; 2 HP, 230/460V for Models
36751 and 36750; 1 phase; 1-1/2 HP, 115/230V
for Model 35652; 1 phase; 2 HP, 115/230V for
Model 36752.60 Hertz, 1725 rpm, totally enclosed
Note:
Alternate elastomers available. Refer to Repair/ Conversion
Kit Numbers, page 4.
INSTALLATION
Mounting Position. Pump may be mounted in any
position. When mounting vertically, it is necessary to
keep bearings above seals to prevent possible seal
leakage into bearings.
Pre-Wetting. Prior to connecting pump, wet pump
elements and mechanical seal by adding fluid to be
pumped into suction and discharge ports. Turn pump
over several times in a clockwise direction to work
fluid into pump elements.
Piping. Piping to pump should be self-supporting to
avoid excessive strain on pump housings. See Table
1 for suction and discharge port sizes of each pump
model.
Use pipe “dope” or tape to facilitate disassembly and
to provide seal on pipe connections.
Electrical. Follow the wiring diagram on the motor
nameplate or inside the terminal box for the proper
connections. The wiring should be direct and conform
to local electrical codes. Check power connections for
proper voltage. Voltage variations must not
10% of nameplate voltage. Motors do not have
overload protection.
To prevent damage to pump, pump rotation must be
clockwise when facing pump from motor end.
OPERATION
Self-Priming. With wetted pumping elements, the
pump is capable of 25 ft. suction lift with pipe size
equal to port size. Be sure suction lines are air tight or
pump will not self-prime.
DO NOT RUN DRY. Unit depends on liquid pumped
for lubrication. For proper lubrication, flow rate should
be at least 10% of rated capacity.
Pressure and Temperature Limits. See Table 1 for
maximum discharge pressure of each model. Unit is
suitable for service at temperatures shown in Table 2.
Storage. Always drain pump for extended storage
periods by removing bottom drain plug. To drain
Model 36750, 36751 and 36752 remove suction
housing bolts and loosen suction housing.
Caution: Suction pressure should never be
greater than discharge pressure.
Table 1. Pump Data
Pump Model
356
367
Suction Port
(NPT)
1-1/2
2
Discharge Port
(NPT)
1-1/4
1-1/4
Voltage Rating
(VAC)
See Motor Name Plate
For Voltage Ratings
See Motor Name Plate
For Voltage Ratings
Discharge Pressure
(psig) (maximum)
50
50
NOTE: SSU =
5 x CP
(approximate)
specific gravity
Table 2. Temperature Limits
Elastomer
Temperature Limits
*NBR
10°-160°F
*EPDM
10°-210°F
*FPM
10°-240°F
*NBR = Nitrile
EPDM =
Ethylene-Propylene-Diene Terpolymer
FPM = Fluoroelastomer
Summary of Contents for 35650
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