Override Or Overrun Brake Couplings

Image_271On 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

Image_275

Hydraulic Conversions

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

Image_276

Brake Plates

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

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