Sourcing Guide
How to prepare a correct trailer axle automatic slack adjuster inquiry by checking OE reference, axle position, left/right direction, spline, arm length and old-part photos.
An automatic slack adjuster is a safety-critical brake component. It connects the brake chamber pushrod to the camshaft and maintains running clearance as the brake lining wears. For trailer axle applications, a close-looking adjuster is not enough to confirm a replacement because spline form, arm length, axle position and handedness can differ.
This guide supports inquiries for the Fuwa / BPW / York trailer axle automatic slack adjuster range. It explains the identification details that should be recorded before a quotation is prepared for trailer, modular trailer or axle-service work.
Identify the axle brand or nameplate first, then record whether the removed adjuster is on the left or right side and which axle position it serves. The same trailer can use different adjuster orientations across axles, and the arm must line up correctly with the brake chamber pushrod after installation.
Take an installed photo before removal. A wider image shows the relationship between the adjuster, brake chamber, camshaft and axle tube. A bench photo alone may not reveal whether the arm points forward or rearward in service.
The current product range includes reference clues such as KN47001, ASH80795, ASH80958S, ASH80811S, ASH20305S and 61128270F. These references help narrow the search, but they should be checked with the spline, arm and installation details rather than treated as automatic interchange numbers.
| Reference Clue | Typical Use | What to Confirm |
|---|---|---|
| KN47001 / ASH80795 | Trailer axle brake applications | Axle position, left/right side, spline and arm direction. |
| ASH80958S / ASH80811S / ASH20305S | Trailer axle brake applications | Arm length, brake-chamber connection and old-part marking. |
| 61128270F | Trailer axle brake applications | Spline/tooth detail, housing shape and pushrod-hole location. |
| 05.174.82.63.3 / 05.174.65.63.0 / 05.174.65.13.0 | Trailer axle brake applications | Position, side and physical comparison before order release. |
The application signals in this range include Fuwa axle, BPW axle, York trailer axle and modular trailer axle. Actual configuration can vary by axle specification, so match the physical component rather than relying on brand name alone.
A slack adjuster can have the correct spline but still be wrong for the axle if the arm points in the opposite direction or uses a different center-to-center length. Installing an incorrect geometry can leave the pushrod out of alignment or prevent the brake from being set correctly. That is why axle position, installed orientation and measured arm length should be included in every inquiry.
Trailer brake work is often planned alongside other automatic slack adjusters, brake chambers, camshaft components and related brake parts. Keep each axle position clearly labelled in a mixed purchase list so confirmed items and photo-pending lines are not confused.
Send the OE or catalog number when available, axle nameplate photo, left/right and axle-position information, clear spline and arm photos, measured arm length, brake-chamber connection photo and required quantity. This allows the replacement to be checked against the actual trailer axle configuration before quotation.
Send a trailer axle brake parts inquiry with the images and purchase list for matching support.
Use this guide to organize a clearer quote request instead of choosing from a short product list.
Part number, truck brand, model, engine model, chassis number and old-part photos help confirm the correct replacement before quotation.
Filters, brake parts, clutch parts, chassis parts, cab parts, bearings, sensors and assemblies can be checked together for one practical order.
Share quantity, packing preference and whether the order is for fleet repair, workshop use or distributor stock.
Send part numbers, truck models, chassis numbers, old-part photos or sample photos. We can help check multiple items and combine them into a practical export order.