Service manual

Group 170 Preventive Maintenance
25
Check Retarder Control
Ensure that the control’s steps are well-defined and that
the control stops in the set position.
26
Check Sealing on Main Brake (Service)
To perform the check of the Main Brake Seal perform the
following:
1 Start engine.
2 Charge the Compressed Air System to 7.5 bar (109
psi).
3 Shut off engine.
4 Release the parking brake.
5 Apply the foot pedal for a minimum of five minutes.
Use a pedal jack whenever appropriate.
6 Use a Dual Pressure Gauge to ensure that the pres-
sure drop doesn’t exceed .10 bar (1.57 psi) per
minute.
7 Listen for air leaks.
8 Disconnect the Dual Pressure Gauge from the com-
pressed air tank.
59