BENDIX M-21-M-22 ANTILOCK MOD ASSY Installationsanleitung PDF herunterladen (Seite 30)

MBS-2 Installation

Active Wheel Speed Sensors

The new Wabash National wheel speed sensor incorporates an Application

Specific Integrated Circuit (ASIC) that contains two Hall cells and a

temperature sensor. The temperature sensor is used to infer wheel bearing

temperature. The use of the dual Hall Effect sensors allows detection of the

direction of the wheels by using a technique known as quadrature. The sensor

is mounted at the end of the trailer axle spindle and retained by a shoulder

bolt. When final assembly is complete, the sensor is setting well protected

within the hubcap. The sensor harness is located in the axle tube and exits

through a strain relief at the center of the tube. The Hall cells are triggered by

a series of magnetic poles embedded in a magnet ring that is pressed into a

unique Wabash National Hubcap. Use of the Wabash active sensor eliminates

the need for the traditional tone ring and mounting blocks. Wabash active

sensors are not adjustable, eliminating sensor out-of-adjustment issues.

IMPORTANT: The in-axle sensor is designed to interface with steel

hubs. When aluminum hubs are installed on the trailer, use a

Wabash Spindle Extension Adapter (10800294) at each sensor. The

aluminum hub is longer than a steel hub. This pushes the hubcap

interface on the aluminum hub outboard and causes misalignment

between the sensor pick-up and the magnet in the hubcap. The result is

that the ABS does not receive wheel speed information and the unit will

not do ABS and will not turn on the backup lamps! When the spindle

extension adapter is installed, longer sensor mounting bolts and lock

washers must be used as well. The part number for the longer bolt is

BLT00511. The part number for the washer is WSH00153. Using

aluminum hubs creates a more complex assembly, however Wabash

supports its use.

281UX009

ABS

Hubcap

In-Axle

Speed

Sensor

Gasket

Spindle

Extension Adapter

(use with aluminum

hubs only)

Use with

Aluminum

Hubs Only

Axle

Spindle

Wave

Washer

Bolt

Figure 18, In-Axle Speed Sensor and ABS Hubcap

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