Operating Instructions - Section 30 03/13 OM3054 Page 30-8 Steering 1. Test the truck steering in extreme right and left directions. If the steering system is not operat- ing properly, shut the engine off, immediately. Determine the problem, and repair before resuming operation. Parking Brake 4. Check operation of the parking brake: a. Apply parking brake switch (3, Figure 30-4). Verify the red parking brake lamp in the elec- tronic display panel illuminates. b. Move transmission shift lever (2, Figure 30- 4) to any position other than N. Verify the central warning lamp on the electronic dis- play panel flashes. NOTE:
The steering and brake systems each have two accumulators that store energy and provide capability to steer and stop the truck in the event of an unexpected engine or pump failure. As part of the routine maintenance of the vehicle, one requirement to ensure proper operation of each system is to maintain proper accumulator nitrogen pre-charge. Refer to the shop manual for proper procedures when charging the accumulators. c. Move the transmission shift lever to the D position. Gradually increase engine speed to 1550 rpm. Placing the shift lever in D ensures that the transmission will start in F2. The truck must remain stationary.
If the truck moves, notify maintenance personnel to adjust the parking brake. DO NOT operate the truck until the parking brake is fully oper- ational. Service Brake d. Reduce engine speed to low idle. Place the selector lever in NEUTRAL. 2. With the truck on flat ground, check for normal operation of the service brake: a. Depress brake pedal (5, Figure 30-3). b. Move transmission shift lever (2, Figure 30- 3) to the D position and gradually increase engine speed to 1700 rpm. The truck must remain stationary. Placing the shift lever in D ensures that the transmission will start in F2. Auxiliary Brake 5. Check operation of the auxiliary brake: a.
Depress auxiliary brake switch (4, Figure 30- 3). Verify the internal red lamp illuminates. c. Reduce engine speed to low idle and release the service brake. Place the shift lever in N. b. Move the transmission shift lever to 5 and gradually increase engine speed to full throt- tle. Placing the shift lever in 5 ensures the transmission will start in F1. The truck must remain stationary. Retarder 3. With the truck on flat ground, check retarder operation: a. Move retarder lever (2, Figure 30-3) to the maximum retard position -lever down. Verify the retarder pilot lamp in the electronic dis- play panel illuminates.
If the truck moves, notify maintenance personnel to immediately repair the brakes. DO NOT oper- ate the truck until the auxiliary brake is fully oper- ational. b. Move the transmission shift lever to the D position and gradually increase engine speed to 1700 rpm. The truck must remain stationary. Placing the shift lever in D ensures the transmission will start in F2. c. Reduce engine speed to low idle. Place the shift lever in NEUTRAL. Switch the auxiliary brake OFF. Verify the red indicator lamp turns off. c. Reduce engine speed to low idle. Move the retarder lever to OFF -lever up. The retarder pilot lamp should turn off. Place the shift lever in NEUTRAL.