MACK T31321, T313L21 and T313LR21 Shifting Instructions CAUTION

Make sur e air essur e least psi and unit operating temperatur e befor e making range shifts. Always start This also applies dynamometer testing. When the truck stationary , NOT shift into range and then start moving the damage the synchr onizer may r esult.

The T313(L)(LR)21 a range - shifted transmission with forward highway speeds and extra gear the range. and ranges are controlled air - shift range selector .

Note: When making a SPLIT SHIFT from gear gear , the splitter switch must not actuated, either down, until the main box When making a SPLIT SHIFT the same gear a preselected gear , especially under a heavy the splitter will not shift until the driveline torque This can done depressing the clutch pedal and releasing it, backing f the throttle and reapplying The splitter switch must not either until IMMEDIA TEL Y before the driveline torque relieved. When making a RANGE SHIFT , important preselect the range This means that the range selector must moved its next position (up down) BEFORE the gearshift lever Then move the gearshift lever through NEUTRAL the next desired gear position. the lever passes through NEUTRAL, the range shift will completed.

Upshift — For purposes explaining the shifting procedures through ALL gears, assume that the vehicle has a full load and will climb a slight grade.

Before moving the the range selector must range and the splitter switch - With the shift lever move the splitter - split (if then the range range (if

Refer the shift pattern and move the shift lever speed gear (LO range,split). Apply accelerator , engage the clutch, and accelerate governed speed. Shift through first, second, third - fourth speed gears, double - clutching between the gears.

T o continue while fourth gear (LOsplit), flip the range selector range (preselect), then move the shift lever through NEUTRAL fifth gear . the lever moves through NEUTRAL, the range shift will completed. Y are now fifth gear - split (HI range). Use a combination the splitter and shift lever continue shifting fifthsplit, sixthsplit, sixth - split and on, until you reach eighthsplit. Remember double - clutch between gears. https://www.truck-manuals.net/