OM3040 03/13 Operating Instructions - Section 30 Page 30-7 Service Brake 2. With the truck on flat ground, check for normal operation of the service (foot) brake: c. Move transmission range selector to the D position and gradually increase engine speed to 1550 rpm. (Placing the range selec- tor in D ensures that the transmission will start in F2.) The truck must remain station- ary. If the truck moves, notify maintenance personnel to adjust the parking brake. DO NOT operate the truck until the parking brake is fully operational. a. Depress foot brake pedal (1, Figure 30-1). Verify amber service brake lamp (4) in left pod illuminates. b.
Move transmission range selector (2, Figure 30-2) to the D position and gradually increase engine speed to 1700 rpm. The truck must remain stationary. (Placing the range selector in D ensures that the trans- mission will start in F2.) d. Reduce engine speed to low idle. Place the selector lever in NEUTRAL. c. Reduce engine speed to low idle, release the service brake and place the range selector in N. Verify the service brake lamp is off. Auxiliary Brake 5. Check operation of the auxiliary brake: a. Depress auxiliary brake switch (3, Figure 30- 1) to select the ON (applied) position. Verify the internal red lamp and service brake lamp illuminate. Retarder 3.
With the truck on flat ground, check retarder operation: b. Move the transmission range selector to 5 and gradually increase engine speed to full throttle. (Placing the range selector in 5 ensures the transmission will start in F1.) The truck must remain stationary. a. Move retarder lever (2, Figure 30-1) to maxi- mum retard position (lever down). Verify amber service brake lamp (4) in the left pod illuminates. b. Move the transmission range selector to the D position and gradually increase engine speed to 1700 rpm. The truck must remain stationary.
(Placing the range selector in D ensures the transmission will start in F2.) 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. c. Reduce engine speed to low idle. Move the retarder lever to OFF (lever up). The service brake lamp should turn off. Place range selector in NEUTRAL. c. Reduce engine speed to low idle. Place the range selector lever in NEUTRAL. Switch the auxiliary brake OFF. Verify the red indicator lamp and service brake lamp are off. Parking Brake 4. Check operation of the parking brake: a. Depress parking brake switch (3, Figure 30- 1) to the ON (applied) position.
Verify the red parking brake lamp (5) in left pod illuminates. b. Move transmission range selector (2, Figure 30-2) to any position other than N; verify cen- tral warning lamp (6) on the left pod flashes.