moyno 500 PUMPS, 30102, 30100, 30104, 30105 Service Manual
SERVICE MANUAL
MOYNO® 500 PUMPS
Storage. Always drain pump for extended storage
300 SERIES
30100, 30102, 30104, AND 30105 MODELS
DESIGN FEATURES
Housing: Phenolic
Pump Rotor: Phenolic
Elastomers: NBR, EPDM, FPM
Shaft: Carbon steel
Bearings: Prelubricated, fully sealed ball bearings
mounted on shaft and
integrally cast in pump body.
Seal: Mechanical (carbon/ceramic)
Mounting: Resilient mountings for quiet operation
Port Size: 1” OD for hose connections
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 shaft over
several times in a counterclockwise direction to work fluid
into elements.
Piping. Install 1” ID hose using adjustable hose clamps. If
hose is lengthy, it should be supported to avoid excessive
strain on pump housings.
Drive. On belt driven units, adjust belt tension to point of
non-slip. Do not overtighten.
On direct drive units, coupling components should be
aligned and spaced at least 1/16” apart.
Note: Pump shaft diameter is .6267”. Pulley or coupling
may have to be hand reamed for proper fit.
Check rotation before startup. Rotation must be
counterclockwise when facing shaft to prevent rotor
unscrewing from shaft.
Maximum speed is 1750 rpm.
Section:
MOYNO® 500 PUMPS
Page: 1 of 4
Date: March 1, 1998
periods by removing suction and discharge lines, loosening
resilient mount clamps and turning discharge port to drain
position.
Table 1. 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
TROUBLE SHOOTING
WARNING: Before making adjustments, disconnect
power source and thoroughly bleed pressure
from system. Failure to do so could result in
electric shock or serious bodily harm.
Replace belt or coupling guards before reconnecting power.
OPERATION
Self-Priming. With wetted pumping elements, the pump is
capable of 25 feet of suction lift when operating at 1750
rpm with hose size equal to port size. Be sure suction lines
are air tight or pump will not 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 at a given rpm.
Pressure and Temperature Limits. Maximum discharge
pressure is 25 psig. Unit is suitable for service at
temperatures shown in Table 1.
Failure To Pump.
1. Belt or coupling slip: Adjust belt tension or tighten set screw
on coupling.
2. Stator torn; possibly excessive pressure: Replace stator,
check pressure at discharge port.
3. Wrong rotation: Rotation must be counterclockwise when
facing shaft.
4. Threads in rotor or on shaft stripped: Replace part. Check
for proper rotation.
5. Excessive suction lift or vacuum.
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