FAQs

Frequently Asked Questions

General Information

What is considered a good Meg rating?

The recommended minimum insulation resistance to ground when measured at, or corrected to, 40 degrees C, is the rated machine voltage potential in kilovolts +1, in megohms. Unit should be meggered 1 – 10 minutes for a polarization index value. 2.0 is considered a minimum value when you divide the 10 minute reading by the 1 minute reading. The PI value is the result of that division.

Can you rewind a 3 phase motor for single phase?

Yes, but it is usually not cost-efficient.

Can you help me get a used production line I bought up & running?

Yes, our automation and controls division can evaluate what your needs are and will customize a design, fabricate the enclosures and controls and program the system to your needs. We will then provide CAD drawings for future reference.

Can you test a winding in the field for faults?

Yes, we have portable meggers, surge testers, and DC absorption equipment that can be used in the field.

What are your business hours?

We are available 24 hours per day, 7 days a week to provide sales or services to keep your business running. Our regular business hours are Monday through Friday, 8:00 am to 4:30 pm. Our after-hours “Emergency” phone number is 314-638-0166.

OSHA Standards

What are the OSHA crane & hoist standards? Can you help me adhere to them?

Our Crane and Hoist division has certified technicians to provide monthly, quarterly or annual inspections. We will tag all of the equipment inspected and give a written report on each piece, with a quotation for repairing or replacing any unsafe equipment.

Repair Service

Do you repair and re-certify U/L motors?

Yes, Zeller Electric entered the U/L program at its very beginning in 1977.

Routine Service

Do you service servo motors or spindle motors?

We service both types with limitations. The majority of the servo motors are imported. They come with many types of speed and control regulators such as encoders, TAC generators and resolvers. When we receive units that we cannot connect to our control stations to completely test, we will send them to a qualified station that can give reliable service on that particular unit.

How often should you grease bearings?

Depending on the size of the bearings, RPM, the number of hours running, if the motor is vertically or horizontally mounted, or in a hostile environment will all affect the frequency of greasing. A motor should be greased according to the manufacturer’s recommendation. A simplified chart is available that we can send you.

Is all grease compatible?

No, there are 12 different types of lubricant compounds. The chances are that they will not be compatible.

How much grease should be pumped in the bearings?

We are available 24 hours per day; 7 days a week to provide sales or services to keep your business running. Our regular business hours are Monday through Friday, 8:00 am to 4:30 pm. Our after hours “Emergency” phone number is 314-638-0166.

Do you evaluate condition of bearings and overall performance? How often should this be done? What is the cost?

Yes, we perform a service called ‘PMP’ (Predictive Maintenance Program). This service is performed with equipment running in normal state with no shutdown required. Frequency of testing depends on how critical the equipment is for plant operation. The cost of testing is based on the number of pieces and points that need to be checked. Call for a FREE ‘on site’ appraisal.

Products & Parts

What Manufacturers Do You Service/Sell?

Cranes

Hoist

Hoist Accessories

Motors

Motors

Reducers

Controls

AC/DC Variable Speed Drive

General Accessories

Can’t Find Your Question? Connect Directly

Crane & Hoist Contact

Ryan Shelton – Manager

314.638.9641 x.229
[email protected]

Repair: Ship To

4250 Hoffmeister Ave
St. Louis, MO 63125

Competencies
  • New Cranes
  • Hoist & Crane Repair
  • Control Upgrades
  • Radio Upgrades
  • Inspections
  • Load Testing
  • Tests & Maintenance
  • Certification Classes
Service Areas
  • Missouri
  • Illinois
  • Iowa
  • Indiana
  • Arkansas
  • Kansas
  • Kentucky
  • Tennessee
Larry Klevorn – Manager

314.638.9641 x.224
[email protected]

Nick Schneeberger – Assistant Manager

314.638.9641 x.230
[email protected]

Repair: Ship To

4250 Hoffmeister Ave
St. Louis, MO 63125

Competencies
  • Motor repair
  • Motor rewind
  • Motor balancing
  • Equipment diagnostics
  • Pump repairs
  • Fan repairs
  • Gearbox repairs
  • So much more
Service Areas
  • Missouri
  • Illinois
  • Arkansas
  • Kansas
  • Kentucky
  • Tennessee
  • Indiana
Tom Rudloff – Manager

314.638.9641 x.259
[email protected]

Repair: Ship To

4250 Hoffmeister Ave
St. Louis, MO 63125

Competencies
  • Drive & Control Repair
  • Infrared Thermography
  • Energy Efficiency & Power Analysis
  • Switchgear Testing & Upgrading
  • Panel Shop Fabrication
  • Panel Assembly Services
  • UL508a
  • AutoCAD
  • PLC Programming
  • System Integration
  • Laser Alignment
  • Balancing
  • Predictive & Preventative Maintenance
Service Areas
  • Missouri
  • Illinois
  • Arkansas
  • Kansas
  • Kentucky
  • Tennessee
  • Indiana

Our Incredible Service Promise

Keeping our customers as the priority, we back all our work, products, and parts. Transparent and forthcoming reports, and straightforward advice is what has allowed our family business to not just survive, but thrive over the past century.