Operation - Section 3 OM3020.3 02/01 Page 3-34 Instrument Panel & Indicator Lights STATUS / WARNING INDICATOR LIGHT SYMBOLS Indicator Lights which are AMBER (Yellow)in color alert the operator that the indicated truck function requires some precaution when lighted. Indicator Lights which are RED in color alert the operator that the indicated truck function requires immediate action by the operator. Safely stop the truck and shut down the engine. DO NOT OPERATE THE TRUCK WITH A RED WARNING LIGHT ILLUMINATED . Refer to Figure 3-7 and the descriptions below for explanations of the symbols. Location of the symbols is described by rows (A-E) and columns (1 - 6). A1. NOT USED Not currently used.
Reserved for future use or options. B1. Low Steering Pressure When the keyswitch is turned “ON”, the low steering pressure warning light will illuminate until the steering system hydraulic pressure reaches 2100 psi (14.7 MPa). The warning horn will also turn on, and both will remain on, until the accumulator has been charged. During truck operation, the low steering pressure warning light and warning horn will turn sound if steering system hydraulic pressure drops below 2100 psi (14.7 MPa). 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 truck operation may continue.
If the indicator light illuminates at higher truck speed and high engine RPM, DO NOT OPERATE TRUCK. If the low steering warning light continues to illuminate 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. Do not attempt further operation until the malfunction is located and corrected. The low accumulator precharge warning light, if illuminated, indicates low nitrogen precharge for the steering accumulator(s). To check for proper accumulator nitrogen precharge, engine must be stopped and hydraulic system completely bled down; then turn keyswitch to “Run” position.
Warning light will NOT illuminate if system is properly charged. The warning light will flash if the nitrogen precharge within the accumulator(s) is below 1100 ± 45 psi (7585 ± 310 kPa). C1. Low Accumulator Precharge Pressure If low accumulator precharge warning light flashes, notify maintenance person- nel. Do not attempt further operation until the accumulators have been re- charged with nitrogen to 1400 psi (9653 kPa). Sufficient energy for emergency steering may not be available, if system is not properly charged. D1. NOT USED Not currently used. Reserved for future use or options. E1. Low Brake Pressure This red indicator light indicates a malfunction within the hydraulic brake circuit.
If this light comes on and buzzer sounds, shut down truck operation and notify maintenance personnel. NOTE: Adequate hydraulic fluid is stored to allow the operator to safely stop the truck.