Clark NPR17 - Page 96

Traction Control
4k WARNING
Do not attempt to make repairs unless you are a trained
authorized mechanic.
Test for correct function of the traction control. Check creep speed, 1A
range, and plugging.
1. Check creep speed and 1A range while driving the truck in a
straight line in both forward and reverse directions. All speed
changes should be smooth while increasing and decreasing
speed. Notice any unusual drive axle noise or action of the
controls and drive train components.
Stop the truck with the parking brake. Note any unusual
reactions in driving or braking performance. Note any need for
adjustment.
2. Check the plugging function first at a slow speed. If operating
correctly then test at full speed.
First drive the truck in the FORWARD direction. Move the
directional control to forward and allow the truck to accelerate
to the desired travel speed. Then, move the direction control
to the REVERSE position. The truck should slow to a smooth,
controlled stop and accelerate in the opposite direction.
Repeat the test by moving the direction control back to the
forward position.
Check the accelerator control while conducting the speed range tests.
It must move easily and smoothly throughout the acceleration range and
return without binding.
When you have completed the operational tests, park and leave the
truck according to standard shut down procedures.
Be sure to make a record of all maintenance and operating
problems you find.
6-20 Functional Tests