BC Model Backstops by Marland Clutch

BC Model Backstops by Marland Clutch

Marland BC model clutches are extremely reliable roller style, bearing supported backstops provide positive protection against potentially dangerous and damaging reverse torque runaways of inclined conveyors. They provide positive roll back protection to equipment like inclined belt conveyors and bucket elevators, where reverse rotation must be prevented. These backstop clutches are self-contained and oil-lubricated, designed to operate in dusty, high temperature mine and stone pit environments. Torque ranges from 3,000 to 720,000 lb.ft. Speed ranges from 0 to 300 RPM.

The Need For Adequate Backstops

Positive protection against reverse torque runaways of inclined conveyor or elevated installations, and adequate provision for the safety of operational personnel, can be assured by considering the following:


1. The causes of reverse torque loading conditions.

2. The importance of installing backstops on low speed headshafts.

3. Use of sound methods for selecting backstop sizes, based on many years of successful installations, rather than theoretical reverse torque calculations.

4. The basic design, operating principle and uniformly high torque capacity of Marland One-Way backstops.

5. The simple maintenance and lubrication requirement of the Marland design.

Product Features

  • 20-year, 24/7/365 service life
  • Superior roller design
  • Optional Smart Marland Monitoring System
  • Full contact Taconite seals
  • Lower stresses
  • Positive triple-sealing
  • 19 standard models available with torque ranges up to 2,100,000 lb.ft.
  • Removable torque arm
  • Optional Smart Marland Monitoring System
  • Superior roller design

Design Features

Marland backstops are completely mechanical, automatic operating units, incorporating a time proven basic operating principle, to provide greater safety and longer life with minimum maintenance requirements. Seventeen standard sizes are available up to 1,200,000 pound-feet of torque. Superior performance is assured by the following design features:



Backstop is a symmetrical product which can be mounted for desired free shaft rotation. Arrows on cam faces or inner labyrinth show the direction of free rotation.

The torque arm is a single “I” beam section which is attached to the backstop with two precision ground torque arm pins. This greatly simplifies field installation. The arm may be placed up down, or at any angle, and provides uniform loading on both cover plates. The position is preferred to be horizontal to reduce bearing loading for longer bearing life.



The Clutch elements and ball bearings are self-oiled in a sealed oil chamber. The recommended lubricant is Mobil DTE Heavy Medium oil for a wide range of ambient temperatures. A double-lip oil seal is provided adjacent to the ball bearings to keep oil in and contaminants out.



  1. All metal labyrinth, grease packed.
  2. Full circle square packing against ground inner labyrinth which maintains grease seal and serves as an additional barrier to entry of dirt.
  3. Double-lip oil seal to prevent grease from entering oil chamber and oil dilution of sealing grease.



Grease fittings in each outer labyrinth are provided for occasional renewal of grease seal which forces out dirt and old grease through relief fittings. A periodic check of oil level and purity can be made through oil level indicator while in operation or at rest. If inspection reveals impurities in the oil, draining, flushing and refilling can be easily accomplished through the piping, tees, and drain plugs furnished.


Marland Clutch Backstop Catalog

Marland Cluch BC Backstop Automatic Grease Lubrication System


Contact Us if you have any questions, need more information or if you are interested in purchasing a BC Model Backstop.

HVH Industrial is an authorized distributor of Marland Clutch, we work closely with the Marland engineering team to provide superior customer service and support.


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Vladimir Harutyunyan

Vladimir Harutyunyan is the founder of HVH Industrial. He has masters degree in mechanical engineering and over 10 years of experience in mechanical power transmission field. 

Feel free to connect with Vlad on Linkedin: https://www.linkedin.com/in/vladharut


Vladimir Harutyunyan

Vladimir Harutyunyan is the founder of HVH Industrial ...

Feel free to connect with Vlad on Linkedin: https://www.linkedin.com/in/vladharut

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