Trailer Hitch Coupling Overrun Damper - AB Tools - BS063
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Product Information
Full details
The AB Tools BS063 trailer hitch coupling overrun damper is an essential replacement component for owners of trailers equipped with Knott-style couplings, specifically designed for those with a total weight capacity between 1400kg and 2700kg. It provides the critical dampening required for smooth braking and towing control, ensuring the hitch mechanism operates correctly under load. While it is built for professional-grade durability, users must verify their specific coupling model number before purchase to ensure compatibility, as it is strictly engineered for Knott KRV27, KF27A, and KFG27 units.
All features
| Model Part Number | BS063 |
|---|---|
| Brand | AB Tools |
Extended Product Information
FAQs
Will this fit a non-Knott coupling?
No, this damper is specifically designed for Knott KRV27, KF27A, and KFG27 coupling models.
What is the weight range for this damper?
This unit is suitable for trailers with a total weight capacity between 1400kg and 2700kg.
Does it come with mounting nuts?
Yes, the BS063 includes the necessary nuts and washers for installation.
Can I use this on a trailer under 1000kg?
No, this damper is calibrated for the 1400kg-2700kg weight range and will not function correctly on lighter trailers.
How long is the damper body?
The body length is 330mm, with an overall length of 550mm.
What is the piston end thread size?
The piston end features a standard 10mm thread.
Troubleshooting
Damper makes a knocking sound during braking
This often indicates air in the system or a worn-out damper; ensure the unit is securely bolted and no internal play exists in the hitch head.
Hitch feels 'stuck' or slow to extend
Check the sliding drawtube for physical damage or debris, and ensure the grease points on the coupling have been serviced recently.
Damper does not fit the coupling housing
Verify that your coupling is a Knott KRV27, KF27A, or KFG27; if the housing diameter or mounting points differ, this unit is not compatible.
Pros and Cons
Pros
- High-quality, durable construction for commercial or occasional use
- Comprehensive kit includes necessary mounting hardware
- Precise dimensions ensure seamless replacement for specified Knott models
- Effectively restores proper overrun braking performance
Cons
- Limited compatibility; will not fit non-Knott coupling systems
- Installation requires mechanical knowledge of trailer braking systems
- Strict adherence to weight class (1400kg-2700kg) is mandatory for safety
Setup, Compatibility & Care
To install, first ensure the trailer is securely supported on jack stands. The replacement process involves removing the old damper from within the drawtube of the Knott coupling. Always consult your trailer's original manual when disassembling the hitch mechanism. Since the BS063 uses a 10mm thread on the piston end, ensure that the connection point on your specific coupling is clean and free of rust before securing the new hardware. Periodically inspect the rubber bellows (gaiter) covering the damper; if the gaiter is torn, moisture and road grit can enter and significantly shorten the life of your new damper. Keep the sliding parts of the hitch head greased according to your trailer manufacturer's maintenance schedule to prevent binding.