Maintenance; Trouble Shooting Aid - MDM C-Shell 4X3-10 Installation And Service Manual

Lubrication:
Rotary Seal - Requires no lubrication after assembly.
Motor Will Not Rotate
1. Check for proper electrical connections to motor.
2. Check main power box for tripped circuit breaker.
Motor Hums Or Will Not Rotate
1. Check for proper electrical connections to motor and proper wire size according to local electrical codes.
2. Check for foreign material inside pump.
3. Remove volute and check for impeller rotation without excessive resistance and/or noise.
4. Remove pump and check shaft rotation for excessive bearing noise.
5. Check start switch and/or capacitor.
Pump Operates With Little Or No Flow
1. Check to insure that pump is primed.
2. Check for leaking seal.
3. Improper line voltage to motor or incorrect rotation.
4. Check for clogged inlet port and/or impeller.
5. Defective check or foot valve.
6. Check inlet lines for leakage, either fluid or air.
Pump Loses Prime
1. Defective check or foot valve.
2. Inlet line air leakage.
3. Seal leaking.
4. Fluid supply low.
Motor Or Pump Overheats
1. Check for proper line voltage and phase, also proper motor wiring.
2. Binding motor shaft or pump parts.
3. Inadequate ventilation.
4. Fluid being pumped should not exceed 194°F (90°C) for extended periods of time
MDM INCORPORATED
3345 N. Cascade Ave • Colorado Springs, CO • 80907
Phone (719) 634-8202 • Fax (866) 425-1346
www.mdminc.com • info@mdminc.com
PROUDLY MADE
IN THE USA
®
The pump must be drained before servicing or if stored below freezing temperatures.
Periodic replacement of seals may be required due to normal wear.

TROUBLE SHOOTING AID

Generated from efficiency. Adapted for flow. Built for longevity.
4X3 GENERAL ASSEMBLY

MAINTENANCE

MDM Incorporated is not responsible for any McMaster-Carr parts used in installation. Molykote
is a registered trademark of Dupont™. C•Shell
C-Shell 4x3 General Assembly Manual 2022.indd. Adobe Indesign CC. Updated Updated 4/27/22.
is a registered trademark of MDM Incorporated.
®
© MDM INCORPORATED
WWW.MDMINC.COM
®
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