If the transmission oil temperature reaches 250 o F (121 o C), the CHECK TRANS indicator light will come "On". The ECU (Electronic Control Unit) will inhibit operation of the truck in higher gears. NOTE: The Transmission Temperature Gauge (23) indicates the converter tempera- ture. The ECU senses oil temperature in the sump. The two temperatures may be different. (36) ALT FAULT LIGHT This light will illuminate if the alternator output exceeds 30 VDC or battery voltage is less than 24 VDC or if voltage for each battery differs more than 0.75 V. (37) LAMP TEST SWITCH The lamp test switch is provided for the operator to test the warning and indicator lights before engine start-up.
The key switch is turned to the "Run" position and the lamp test push button switch is depressed to the "On" position. This action will complete a circuit to the warning and indicator lights. (38) ALARM HORN The alarm horn is a signaling device used to alert the operator of a malfunction within a system. The alarm horn will sound if low steering pressure and/or low brake pressure is detected. When the alarm horn sounds during operation, a warning light will come "On". The warning light (39 or 41) will be the operator’s visual aid in determining which system is malfunctioning.
(39) EMERGENCY STEERING The Emergency Steering Light, when actuated, indicates that the steering circuit pressure is decreasing and is below 1800 psi (12.4 MPa). If the light comes "On", stop the truck immediately and have the system checked. Do not attempt further operation until malfunction is located and corrected. HB5-10 Instruments and Controls HB5014 4/94