Replacement Chain and Components

Replacement Chain and Drive Components

The core components of a Drag Chain Conveyor are the casing, the drive and terminal, and the chain. The chain is the primary component within the conveyor and must provide the life and performance necessary for the application and operating environment. The strength and wear resistance of the link and chain bolt are extremely important to the operating life of the conveyor.

Strength – DIN standards recommend a 5:1 allowable working load vs. ultimate strength of the chain. This safety factor allows for start-up and shock loads

Wear Resistance – The chain wears from material and pin joint abrasion. The ability to resist abrasion is dependent on the optimum intersection of material hardness and ductility.


This is why CDM has created our own unique formula for drag conveyor chain. We believe a balance of strength, hardness, and ductility along with an engineered chain design profile gives our chain exceptional tensile, shear, and bearing area.


Maintenance Advice and Tips:

We take a great deal of pride in the design and manufacture of the best quality conveyor for your needs. Like all mechanical equipment, your drag conveyor will need routine preventative maintenance. Here are some tips and advice on what maintenance is routine and what are the warning signs that emanate failure could be looming without parts replacement. Please review your O&M manual for detailed maintenance to your specific conveyor.

Chain Tension:

Proper chain tension is among the most important factors in a conveyors success. After an initial break-in period, chain tensioning should be a part of every PM inspection and tension adjustments can be done in minutes with or without shutting the equipment down. Once tensioning requirements begin to increase in frequency, this means you are approaching the end of the chain case hardness and the chain should be replaced during the next upcoming outage. Measuring the links and pins removed during normal tensioning can provide insight into the chains longevity for future outage and replacement schedules.

Sprocket Maintenance:

Tooth wear on conveyor sprocket.Sprockets are intentionally fabricated and hardened at a slightly lower hardness compared to the chain to minimize chain wear and potential damage to the chain. The illustration to the right represents normal wear of the sprocket due to the continual engagement of the chain on each tooth. The gradual wear of the sprocket down to ¼” below original surface engagement with the chain indicates the sprocket must be replaced. Operating the chain on worn sprockets can result in damage to the chain because it creates an improper pitch diameter. This improper pitch will shock load the chain because the chain is “hooking”, creating higher stress loads on the chain because of the improper sprocket engagement.

Sprockets are a critical item in proper conveyor operation that often get overlooked during routine maintenance. Typically sprocket tooth plates will need to be replaced 1 or 2 times throughout the chains lifecycle. New chain should ALWAYS be installed with new sprocket tooth plates.

Sprocket Cleaners / Return Rails:

Sprocket cleaner return rails are the first defense to worn sprockets, improper chain tension and material build-up within the sprocket itself. CDM fabricates these rails in short sections which can easily be replaced during a short outage or normal PM (Preventative Maintenance) schedule. Over time these rails will take the brunt of the wear for the return rail assembly. If wear is observed of 1/4″ or greater from the original installation thickness, the sprocket cleaner rail should be replaced.


Lubrication requirements on the drag conveyor is straight forward. Drive and terminal station bearings will require normal lubrication with grease. The recommended intervals will vary depending upon the specific service duty of the conveyor. There are no intermediate bearing locations. The only other lubrication areas are the gear reducer and the reducer bearings. Each will require normal level check and oil changes as specified by the manufacturer. In some cases greasing the reducer bearings is also necessary. The motor is the only other item that will require normal grease per the OEM’s recommendations.


Select the forms below to place a request for quote for the replacement chain and components you need.

Drop-Forged Chain RFQ   Sprockets and Idlers RFQ