Air Assemblies
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INSTALLATION & MAINTENANCE
8
SELECTING THE RIGHT WORKING LENGTH

1 | Measure the distance between the tractor and trailer hookup points at the point of greatest extension during a full right turn articulation. Note that in the case of lines that are suspended off the deck by a clamp, the point at which the tubing is clamped (rather than the tractor protection valve), should be considered the tractor connection point for purposes of this measurement.

2 | Use the following chart to determine the correct working length to select.

Tractor
Measurement between tractor
Between
Straight
Less than 8'
More than 10'
& trailer hookup points:
8' & 10'
Recommended working length:
12'
15'
20'
3 | For straight jumper or AirPower Lines, a shorter working length than the coiled hoses is required. In cases where a 15' coiled hose is used, a 12' straight line can be used.
Maximum
Distance
SELECTING THE RIGHT TRACTOR LEAD LENGTH
Trailer

Most new tractors have less than an 18" distance between the tractor air connection and the deck.

This makes hookups more accessible to the user but requires that the lines have a longer lead and some method of suspension to protect them from abrasion.

Tractor
18" Min

The rule of thumb is to use a longer lead length if the hookup distance is less than 18" from the deck.

For proper suspension of the longer tractor leads, consult the Hose Suspension Devices section (Section 6) for a selection of pogo sticks, tender kits and slider bars.

2019 | ALLIANCE TRUCK PARTS AIR ASSEMBLIES
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