12/17/2019 SIS 2.
2019/06/18 Braking System - Test (SEBU9228)
SMCS - 4251,4267 i07789021
Service Brake Holding Ability Test
Make sure that the area around the machine is clear of personnel and clear of obstacles.
Test the service brake on a dry level surface.
Note: A 50 m (164 ft) area is required to conduct the test.
Fasten your seat belt before you test the brakes.
Use the following test in order to determine whether the service brake is functional. This
test is not intended to measure the maximum holding ability of the service brake.
1. Start the engine. Raise the blade slightly. Engage the transmission modulator
control (inching pedal). Select the SECOND SPEED FORWARD position on the
transmission. Disengage the parking brake. Disengage the transmission modulator
control (inching pedal).
2. Set the throttle hold mode switch to the MANUAL position. Push the top of the
throttle set/accel switch in order to set the engine speed to high idle.
3. Engage the service brake control.
4. Reduce the engine speed to 1600 rpm. Disengage the service brake control in
order to recover the engine rpm.
Note: If the service brake control does not reduce the engine rpm the friction
material for the brake may require replacement. The new friction material for the
brake may require conditioning for maximum performance. Consult your Cat dealer
or see Special Instruction, SEHS9187 for the procedure for conditioning.
5. Reduce the engine speed to low idle. Stop the machine. Place the transmission in
the NEUTRAL position. Engage the parking brake control. Lower the blade to the
ground and lower the ripper to the ground. Stop the engine.
Parking Brake Holding Ability Test
Personal injury can result if the machine moves while testing.
It the machine begins to move during test, reduce the engine
speed immediately and engage the service brake control.
NOTICE
If the machine moved while testing the parking brake, consult
your Caterpillar dealer.
Have the dealer inspect and, if necessary repair the parking
brake before returning the machine to operation.
Be sure that the area around the machine is clear of personnel and clear of obstacles.
Test the parking brake on a hard dry surface.
Fasten the seat belt before you test the parking brake.
Use the following test to determine whether the parking brake is functional. This test is
not intended to measure the maximum holding ability of the parking brake.
1. Position the machine on a slope of 20 percent.
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12/17/2019 SIS 2.0
2. Engage the parking brake control. Release the service brake control. The wheels
should not rotate. If the wheels rotate, engage the service brake control.
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