36
Transmission/ Transfer Case
Drive Shaft
Magnets Positioned
180° Apart
¼” to ½”
(6mm to 13mm)
Spacing
Sensor Body
(Green)
Fasten Sensor Bracket with
Existing Transmission Bolts
or Rigidly Attach with Clamps.
Appendix A
(cont)
Optional Speed Sensor Mounting on Drive Shaft
NOTE: This is an optional method generally used on
pickups or custom vehicles. It may also be nec es sary on
any other vehicles where ac cess to the wheels is lim it ed.
This in stal la tion requires a spe cial calibration procedure,
see page 27.
Determine the best location for the magnets on drive shaft
according to which is the most practical spot to attach
sensor mounting bracket. This position should be no more
than 12” (.30 meters) behind the front U-joint. For best
results, mount “L” bracket to transmission and mount
magnets on drive shaft as close to transmission as pos si ble.
This will en sure prop er alignment if drive train shifts under
heavy loading.
Two magnets are required for proper Hall-effect speed
sensor operation. Position them exactly opposite each other
(180 de grees apart). The polarity (north and south poles)
detect ed by the Hall-effect speed sen sor must alternate as
the shaft is turned. The magnets provided by Micro-Trak are
marked with a punched dashed line on the SOUTH pole side
of the magnet.
•
Attach magnets onto drive shaft, one NORTH pole
side out and the other SOUTH (dashed) pole side out,
by wrapping ca ble tie around shaft and magnets.
Position each mag net so that its longest dimension
moves in the di rec tion of rotation. Pull cable tie tight
and trim off excess. An adjust able, non-magnetic
(stain less steel) band clamp may also be substituted.
•
Attach sensor bracket to vehicle transmission
with bolts, lockwashers and nuts provided.
See
Illustration below.
(Use self-tapping screws if bolts are
not prac ti cal.) Use either the short or long end of the
brack et as a base. (Allow enough room be tween the
bracket and the magnets so that when prop erly spaced,
the tip of the sensor will extend 1/4” [7mm] or more
be yond the lock ing nut.)
•
Turn one locking nut onto threaded sensor and in sert
sensor into large hole selected on mount ing brack et.
Turn on remaining locking nut. Set sensor to proper
distance from magnets (1/4” to 1/2”, or 6mm to 13mm).
When distance is set, tight en nuts to lock sensor in
place.
•
Secure sensor cable to frame with cable ties. Place first
tie as close to sensor assembly as possible.
