Operation - Section 3 OM3037 Page 3-30 Operating Instructions 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 ac- tion 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 de- scribed by rows (A-E) and columns (1 - 8).
For access to the indicator lights (and other overhead display components), remove the row of capscrews nearest the driver and allow the bottom panel to swing down on its hinge. A1. High Hydraulic Oil Temperature This warning light indicates high oil temperature in the hydraulic tank. Continued operation could damage components in the hydraulic system. Notify maintenance personnel immedi- ately. The light turns on at 225° F (107° C). B1. Low Steering Pressure When the keyswitch is turned “ON”, the low steering pressure warning light will illuminate un- til 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 opera- tion 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. C1. Low Accumulator Precharge Pressure 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” po- sition. 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).
If low accumulator precharge warning light flashes, notify maintenance personnel immediately. Do not attempt further operation until the accu- mulators have been recharged with nitrogen to 1400 psi (9653 kPa). Suf- ficient energy for emergency steering may not be available, if system is not properly charged.