Operation - Section 32 02/10 OM3237 Page 32-18 Operator Cab and Controls INDICATOR LIGHT FUNCTIONS Amber indicator lights alert the operator the indicated truck function requires some precaution when lighted. If the low steering warning light continues to illu- minate and the alarm continues to sound, low steering pressure is indicated. The remaining pressure in the accumulators allows the operator to control the truck to a stop. If the oil pressure continues to decrease, the brake auto-apply fea- ture will activate and the service brakes will apply automatically to stop the truck. DO NOT attempt further operation until the malfunction is located and corrected.
Red indicator lights alert the operator the indicated truck function requires immediate action. Safely stop the truck and shut the engine off. To prevent possible death or severe injury, DO NOT operate the truck with a red warning light illuminated. Refer to Figure 32-11 and the descriptions below for explanations of the symbols. Location of the symbols is described by rows (A-E) and columns (1-6). 1. Stop the truck as quickly as possible by using the foot pedal to apply the service brakes. If possible, steer the truck to the side of the road while braking. 2. As soon as the truck has stopped moving, shift the directional control lever to PARK. This will apply the parking brake. A1.
High Hydraulic Oil Temperature This red warning light indicates high oil temperature in the hydraulic tank. Continued opera- tion could damage components in the hydraulic system. 3. Slowly release the service brakes to check the capacity of the parking brake. If the parking brake can not hold the truck stationary, apply the service brakes and hold them ON. DO NOT turn the key switch OFF, and do not release the service brakes. The light illuminates at 107°C (225°F) If this condition occurs, the operator must safely stop the truck, move selector switch to PARK, and operate engine at 1,200 - 1,500 rpm to reduce system tem- perature. 4. Notify maintenance personnel immediately. 5.
If the truck is on level ground, or if the parking brake can hold the truck stationary and the truck is in a stable condition, it is then OK to turn the key switch OFF. B1. Low Steering Pressure 6. If safe to do so, have maintenance personnel place wheel chocks or other mechanisms in front or behind the wheels to reduce the risk of the truck rolling. When the key switch is turned ON, low steering pressure warn- ing light will illuminate until the steering system hydraulic pres- sure reaches 14 479 kPa (2,100 psi). The warning horn will also turn on, and both will remain on until the accumulator has been charged. 7.
If traffic is excessive near the disabled machine, mark the truck with warning flags during day- light hours or use flares at night. Adhere to local regulations. NOTE: If the engine is stopped, and the key switch is OFF and the light is flashing, a malfunction has been detected in the accumulator bleeddown system, indicating there is still hydraulic pressure in the system. The system/component system failure light will also be illuminated, and the warning horn will be on. DO NOT operate the truck, and notify maintenance personnel.
During truck operation, the low steering pressure warning light and warning horn will sound if the steer- ing system hydraulic pressure drops below 14 479 kPa (2,100 psi.) If the light illuminates momentarily (flickers) while turning the steering wheel at low truck speed and low engine rpm, this may be considered normal, and the truck operation may continue. If the indicator light illuminates at higher truck speed and high engine rpm, stop the truck and notify maintenance.