. OPERATION OPERATION 3 - 108 METHOD OF INCREASING SET T RAVEL SPEED If it is desired to increase the set s peed, depress the accelerator pedal to increase speed, and w hen the desired set travel speed is reached, press th changed to the new speed. e set switch on the auto retarder (ARSC) set lever. The set travel speed will be METHOD OF DECREASING SET T RAVEL SPEED If it is desired to decrease the set speed, operate the retarder control lev er to reduce speed, an d when the desired set travel speed is reached, pres s the set switch on the auto retarder (AR SC) set lever. The set travel speed will be changed to the new speed.
REMARK After using the retarder control le ver to reduce the speed, return it to its If the lever is operated suddenly, the brakes will be applied suddenly. TRAVELING AGAIN AT SET TRAV EL SPEED If you travel repeatedly on the sa me slope, set the travel speed. It is the n possible to use that set travel speed by actuating the ARSC without havi ng to reset. Before entering a downhill slope, i f the travel speed has been adjusted to a speed lower than the set speed displayed on the auto retarder set speed ind icator, the auto retarder READY pilot la mp lights and the ARS C is actuated when the accelerator pedal is released .
REMARK When traveling at a speed greate r than the set speed displayed on the au to retarder set speed i ndicator, the ARSC is not actuated even when the a ccelerator pedal is released. When this happens, the auto re tarder READY pilot lamp also does not light up. Alwa ys adjust the travel speed to a speed l ower than the set spe ed displayed on the auto retarder set speed indicator , and check that the auto retarder REA DY pilot lamp lights up . Before starting to travel down a s lope, check again that a suitable set sp eed is displayed on t he auto-retarder set speed indicator and that the auto -retarder ready pilot lamp is lighted up.
METHOD OF CANCELING SET TR AVEL SPEED ing the set travel speed. There are two methods of cancel Method 1:Keep the auto retarder (ARSC) set lever pulled up for at least 1 second to cancel th e setting. When this happens, the auto reta rder set speed indicator shows 0. Method 2:If the auto retarder (AR SC) switch is turned OFF, the control i s canceled. When this happens, the auto retarder set speed indi cator goes out. REMARK With method 1, to prevent the se tting from being cancelled if the switch i s touched by mistake, the switch must be pulled up and kept for at least 1 s ec. at that position to cancel the setting .
RECOMMENDED SET TRAVEL SP EED Set the travel speed so that the e ngine speed is between 1800 rpm and 2 200 rpm or more and tr avel at a speed that keeps the retarder oil pressure g auge inside the white range. If there is danger that the retarder oil may overheat, the set travel speed i s automatically reduce d 1 km/h (0.6 MPH) every 3 seconds. The set travel s peed indicator display also goes down automatically. 6.2 MPH). The lower value for the set travel speed when the speed is automatically reduced is 10 km/h (