Operation - Section 3 OM3024.1 8/00 Page 3-4 Operating Instructions ENGINE START-UP SAFETY PRACTICES Safety rules must be observed upon engine start-up. Starting fluid is extremely volatile and flammable! Use with extreme care. Insure adequate ventilation before start-up, if the truck is in an enclosure. Exhaust fumes are dan- gerous! If truck is equipped with Engine Starting Aid for cold weather starting, and ambient temperature is below -5°C (23°F), push the Engine Starting Aid switch “in” for three seconds; then release. Turn the key switch to the “start” position. If engine does not start, wait at least 15 sec. before repeat- ing the procedure. 1.
Insure all personnel are clear of truck before starting engine. Always sound the horn as a warning before actuating operational controls. 2. Check and insure Transmission Range Selector is in “ N eutral” before starting. 3. Do not attempt to start engine while cold weather starting heater (if equipped) is in operation. Dam- age to coolant heaters will result, due to lack of circulation. Do not crank an electric starter for more than 30 seconds. Allow two minutes for starter motor cooling before attempting to start engine again. Severe damage to starter motor can result from overheating . 4. The key switch is a three position (Off, Run, Start) switch. 5. The truck cannot be push started.
Transmission lube and control systems are inoperative when engine is not running. When the key slot is in the vertical position, the electrical system is “Off” and no electrical devices are energized. 6. When getting a battery assist from one truck to another, all switches must be “Off” prior to making any connections. Be certain to maintain correct polarity. Connect one lead of booster cable to 24V positive (+) post of battery needing assist, and other lead of the booster cable to the 24V positive (+) post of auxiliary battery.
Connect one lead of second booster cable to 24V negative (-) post of auxiliary battery and then connect other lead of the booster cable to a good frame ground on the disabled truck away from the battery needing assist. This procedure will avoid the possibility of causing sparks near the battery where explosive gases may be present. Use this key position to stop the engine when it is running. When the switch is rotated one position clock- wise, it is in the “Run” position and all electrical circuits (except “Start”) are energized.
With Transmission Selector Lever in the “ N eutral” position, rotate key switch fully clockwise to “start” position (Transmis- sion Range Selector in “ N eu- tral”) and hold this position until engine starts (see NOTE be- low). “Start” position is spring loaded to return to “run” when key is released. NOTE: HD1500-5 Trucks are equipped with four 12 volt batteries connected in series and parallel to pro- vide 24 volt output. Be certain to maintain correct voltage and polarity when connecting booster cables. Damage to electrical components may result if voltage and polarity are not correct. NOTE:
The starter is equipped with an Engine Prelube System; a noticeable time delay will oc- cur (while engine lube oil passages are being filled) before starter engagement and engine cranking will begin. The colder the engine oil temperature, the longer the time delay will be. In addition, if truck is also equipped with Engine Starting Aid for cold weather starting, the Engine Prelube System should be engaged FIRST for 5-10 seconds, or until starter is engaged, BE- FORE activating the Engine Starting Aid .