On trailers between 750 kg and 2000 kg total laden mass, braking systems that use an override principal are acceptable, as long as they provide adequate braking for the trailer and tow vehicle combination.
The principal of this type of coupling is a sliding shaft attached to the tow ball housing of the coupling, and as the tow vehicle slows down the force of deceleration is passed through the coupling shaft and pushed either on a mechanical linkage (for mechanical brakes) or acts on a linkage connected to a hydraulic cylinder providing hydraulic pressure to a braking system (hydraulic brakes).
This type of coupling is efficient if the ball load is not excessive and when load levelling devices are not used, as these devices impede the smooth operation of the coupling, impeding the braking performance.
|
PART NO |
DESCRIPTION |
SUITS TOW BALL SIZE |
MOUNTING HOLE (LXW) AND DIAMETER |
SURFACE FINISH |
BALL TO FIRST CENTRE HOLE (NOMINAL) |
|---|---|---|---|---|---|
|
614020PL |
1000 kg Hydraulic Override with 3/4” master cylinder conversion |
50mm |
184mm x 54mm x 13.5mm |
Zinc plated |
137mm |
|
614040PL |
2000 kg Hydraulic Override with 3/4” master cylinder conversion |
50mm |
184mm x 54mm x 13.5mm |
Zinc plated |
137mm |
|
614042PL |
2000 kg Hydraulic Override with 7/8” master cylinder conversion |
50mm |
184mm x 54mm x 13.5mm |
Painted |
137mm |
|
614044PL |
2000 kg Hydraulic Override with 1” master cylinder conversion |
50mm |
184mm x 54mm x 13.5mm |
Painted |
137mm |
|
614027PL |
1000 kg Mechanical Override no plate |
50mm |
184mm x 54mm x 13.5mm |
Zinc plated |
137mm |
|
614054PL |
2000 kg Mechanical Override no plate |
50mm |
184mm x 54mm x 13.5mm |
Zinc plated |
137mm |
|
614050PL |
2000 kg Mechanical Override with plate |
50mm |
184mm x 54mm x 13.5mm |
Zinc plated |
137mm |
|
610949 |
Hydraulic Conversion S’Assy – less cylinder |
Zinc plated |
|
|
610943 |
Hydraulic Conversion with 3/4” master cylinder |
Zinc plated |
|
|
610944 |
Hydraulic Conversion with 7/8” master cylinder |
Zinc plated |
|
|
610959 |
Hydraulic Conversion with 1” master cylinder |
Zinc plated |
|
|
614797PLNZ |
2500kg Override 7/8” Master Cyl |
50mm |
184mm x 54mm x 13.5mm |
|
614785 |
2000kg Snap On with Ball Adj (4 Hole) |
1 7/8” (NZ) |
101.6mm x 51mm x 13.5mm |
|
614051 |
Mechanical Override – brake plate only |
184mm x 54mm x 13.5mm |
Zinc Plated |
|
614052 |
Mechanical Override – brake plate only (marine style) |
184mm x 54mm x 13.5mm |
Painted |
