12. OPERATION 1. Before starting to travel downhill, release accelerator pedal 1 and operate retarder lever 2 to slow the machine down. 2. Move the shift lever to a position (5, 4, 3, L) that matches the maximum permissible speed for the retarder brake performance. 3. When traveling downhill, operate retarder lever 2 , run the engine at a speed of at least 1800 rpm, and travel so that the retarder brake oil temperature gauge is in the green range. For machines equipped with an exhaust brake, using the exhaust brake can provide more secure braking force for increased safety, and will also improve the durability of the brake. For details of handling the exhaust brake, see “11.
EXPLANA- TION OF COMPONENTS, EXHAUST BRAKE SWITCH”. 2-72