LEESON Electric Corporation  

FAQ's - Gearing

What types of gear reducers does Grove Gear offer?
Grove Gear IRONMAN products include worm reducers with cast iron, painted Washguard and stainless steel configurations with center distances of 1.33”- 10.00” and selections to over 100HP. The Grove IRONMAN High Efficiency Series includes helical-inline(R-Series), helical-bevel(K-Series) and helical-worm(S-Series) reducers with selections to over 100HP.
What types of gear reducers does Electra Gear offer?
Electra Gear products include worm reducers with aluminum housings with center distances of 1.33-6.00” and selections to over 35HP. Electra Gear also specializes in custom aluminum worm gear products.
When do you use an inline gear reducer versus a worm gear reducer?

Worm gear reducers offer the highest torque-to-dollar value with high ratios in the smallest package. Worm reducers are right angle reducers, where the input/output shafts of an inline reducer are parallel to each other. Inline reducers are used in higher horsepower applications where long-term operational efficiency is more important than initial cost.

What is meant by “shaft hand” of the gear reducer?

The location of the output shaft of a reducer relative to it’s input shaft is called the hand configuration. It is generally referred to as a right hand (R), left handed (L), or double left and right (D). Determine shaft hand by looking into the input face of the reducer and identify which side of the reducer the output shaft comes out. Refer to the 8050 Gear Catalog for assembly views of all Grove and Electra reducers.

Can I change the shaft hand of my worm reducer in the field?
Yes. The 800 Series reducers have a single output cover design, which requires the removal of the input shaft assembly to achieve opposite shaft hand. Refer to Shaft Hand Change Instructions under Technical Information tab for specific instructions.
Why would I use a C-faced quill input style reducer?

The quill style reducer is used because it’s a compact design and simple to install. Nearly 85-90% of all reducers sold are quill input style. This design is not recommended where continuous reversing service or system jams or stalls are apparent.

Why would I use a C-faced coupled input style reducer?
The coupling style reducer should be used for applications where the system is subjected to continuous reversals, stalls or jams. This design is available on Grove and Electra worm reducers and utilizes a longer “flower pot” input flange design.
What are most common reasons for premature gear reducer failure?

Some of the most common causes for premature failure of a reducer include improper selection for the application, changing the motor horsepower or speed after reducer installation, misaligned or incorrect couplings, improper or insufficient lubrication, and lack of regular maintenance.

Do all Grove and Electra gear reducers come filled with lubricant?
No. Grove and Electra worm reducer sizes 860-8100 are shipped dry. All other standard products are shipped pre-filled with lubricant. Oil type and grade varies by product line. Refer to 8050 catalog or installation manual supplied with gear reducer for lubrication specifications.
What is backlash?
Backlash is the rotational movement of the output shaft clockwise and counter-clockwise, while holding the input shaft stationary. Backlash is usually expressed in thousandths of an inch and measured at a specific radius at the output shaft.
How hot does a speed reducer operate?
It is common for the internal temperature to rise 80-100 degrees F above ambient temperature.
What is “Service Factor” for gearing?

A method of adjusting a reducer’s published mechanical rating to reflect the applications load characteristics. AGMA (American Gear Manufacturer’s Association) has established standardized service factors by application as shown in the Engineering section of catalog 8050. Service factors are usually between 1.0 and 2.0.

Can I reverse my shaft rotation with a worm gearbox?
Yes, all Grove and Electra gear reducers can run either clockwise or counter clockwise without damaging the reducer. Shaft rotation is dependant on motor lead connections. Refer to your motor wiring diagrams supplied with motor for specific instructions.
How often should I change the lubricant in my gear reducer?

Standard compounded lubricants (non-synthetic) should be changed every six months or 2500 operating hours, whichever comes first. Factory installed synthetic lubricants do not require scheduled change intervals. Refer to installation manual provided with gear reducer to verify lubricant used and maintenance requirements.

Do worm gear reducers use right or left hand gearing?
All stock gearing is right hand. Left hand gearing is available in custom designs.
When sizing a gearbox, should thermal ratings also be covered by the service factor?
No, only the mechanical ratings need to be covered by the appropriate service factor, the thermal rating only needs to cover the required horsepower.
How do I buy replacement parts and accessories for my gear reducer?
Grove and Electra sell their gear products throughout the United States and the world through a network of authorized distributors. To find an authorized distributor or Sales office near to you, please enter your zip code in our “Where to Buy” menu
Do you design custom gear products?
Yes. Grove Gear specializes in custom gear product solutions, including helical, spur, bevel or worm gear designs. From custom gear ratios and housings to new gear reducer designs, Grove Gear will dedicate a team to meet your requirements.
Do you charge for mounting motors or gear reducer accessory kits?
No. The Grove Mod-SquadTM will mount any standard accessory or stock LEESON or Lincoln C-faced motor at no charge for the labor.