Description
Gearbox Protection for Constant Speed Molders
The Constant Speed Fiber Drive Pack is an essential replacement part designed to protect the gearbox of Williams & Hussey constant speed molders.
Located between the gearbox and the arbor, the fiber drive functions as a sacrificial component. In the event of a cutting error or sudden load, it is engineered to fail first. This helps prevent expensive damage to gearbox gears and internal drive components.
Replacing a fiber drive is significantly less expensive and less time-consuming than repairing a damaged gearbox.
How the Fiber Drive Protects Your Machine
Unlike hardened steel components, the fiber drive is intentionally designed to give way under excessive stress. This controlled failure protects critical internal components from catastrophic damage.
Because the fiber drive sits in the end of the arbor and connects the gearbox to the drive system, it acts as the first line of defense in the feed mechanism.
If you are using a constant speed molder, we strongly recommend keeping spare fiber drives on hand to minimize downtime if one breaks.
Signs Your Fiber Drive Needs Replacement
Replace the fiber drive if you notice:
- It is visibly broken or cracked
- Feed rollers do not move, even with pressure applied
- The machine powers on but material does not advance
- There is loss of drive between the gearbox and arbor
If the feed rollers are not turning but the motor is running, a broken fiber drive is often the cause.
Concerned About Gearbox Damage?
The fiber drive is designed to protect your gearbox by failing first. However, if a severe cutting error has already caused internal gear damage, additional service may be required.
Williams & Hussey offers professional gearbox repair services to restore proper operation and extend the life of your molder.
If you suspect internal gearbox damage beyond a broken fiber drive, visit our Gearbox Repair Service page for more information.
Important Compatibility Notice
The Constant Speed Fiber Drive Pack is compatible With:
- Williams & Hussey Constant Speed Molders
Not Compatible With:
- Variable Speed (Vari-Feed) Molders
- Any model without a gearbox
If your machine does not use gearbox oil, this part is not compatible.
Not sure which model you have? Contact us before ordering.
What’s Included in the Constant Speed Fiber Drive Pack
- (5) Fiber Drives
Sold in packs of five to ensure you have spares available when needed.


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