Motor Preventive Maintenance
PELLERIN MILNOR CORPORATION
BIUUUM03 (Published) Book specs- Dates: 20071029 / 20071029 / 20071029 Lang: ENG01 Applic: UUU
Motor Preventive Maintenance
This document replaces document MSSM0274AE and applies to grease-lubricated motors used
on Milnor products. Service motors in accordance with any brand-specific maintenance
instructions posted on the motor or provided with your machine. Otherwise, follow the
procedures in this document.
WARNING 1 : Multiple hazards—Contact with electric power can kill or seriously injure
you. Electric power is present inside the cabinetry unless the main machine power disconnect is
off. Contact with moving components normally isolated by guards, covers, and panels, can
entangle and crush your limbs. These components move automatically.
• Do not service the machine unless qualified and authorized. You must clearly understand
the hazards and how to avoid them.
• Lockout/tagout power at the wall disconnect switch before servicing or in accordance
with these procedures.
1. Routine Maintenance Needed
Inspect and clean motors approximately every 500 operating hours or every three months,
whichever comes first. Lubricate motors at the intervals called for in Section 2. Test a motor if it
shows any sign of malfunction.
1.1. Inspect and Clean—Keep the exterior of the motor free of dirt, oil, grease, water, etc.
Contaminates blocking ventilation will cause overheating and early motor failure.
1.2. Lubricate—Frequency, quantity, type and application method are all important. These are
explained in the remainder of this document.
1.3. Test and Repair—If a motor experiences frequent overload trips or inverter faults, verify tha
all electrical connections are tight. If the condition persists, check the motor and winding
insulation integrity using a “megger” (low resistance ohmmeter), or have the motor tested by a
reliable motor shop. If a motor produces smoke or a burning smell, but does not immediately fail,
shut it down and check for dirt or grease accumulation within the motor frame, which can block
air flow and short out electrical conductors. Disassemble the motor as required to thoroughly
remove the contaminates.
2. Determining Motor-specific Lubrication Frequency and Quantity
1. Look up the frame size and RPM on the motor data plate. Example from Figure 1:
Frame size = 215T, RPM = 1725
2. Look up the standard lubrication interval in Table 1. Example based on above:
Standard lubrication interval = 12,000 hours
3. Choose the appropriate
service severity rating and multiplier from Table 2. Example based on
an ambient temperature of 102°F (39°C) and a moderately corrosive atmosphere:
Service severity rating = severe, Multiplier = 0.5
4. Calculate the actual lubrication interval. Example based on above:
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