MACK T318, T318L and T318LR 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.

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.

T o prepare for moving the position the shift lever select - split using the splitter and select range using the range selector

Refer the shift pattern and move the shift lever speed gear (LO range,split). Apply accelerator and engage the clutch, then accelerate governed speed. Select the splitter switch (preselect) and release the accelerator pedal long enough for the split shift complete. Reapply the accelerator . Shift through firstsplit, firstsplit, secondsplit, second - split and on, until you reach fourthsplit. Remember double - clutch between gears.

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

T o upshift from - split - split (in the same accelerate the engine governed speed, move the splitter switch depress the clutch and back f the accelerator Reapply the accelerator and engage the clutch when the audible shift when the engine speed falls approximately 200 Depressing the clutch may not necessary break the driveline but this will vary with road and load

T o upshift from a - split gear the next higher gears - split (in the same range), accelerate the engine governed speed, then move the splitter switch you move the shift lever through NEUTRAL the next higher gear . Note that the splitter switch must not actuated down the position until the main box

Downshift Shift from eighth - split eighthsplit, then seventhsplit, seventh - split and (double - clutching between the gears), until you reach fifthsplit.

T o continue while fifth gear - flip the range selector down range and you move the gearshift lever through NEUTRAL fourth gear , move the splitter switch from the shift lever moves through the range shift will Y are now fourth gear - split (LO Continue using the shift lever and splitter the normal manner , until you reach speed gear (LO -

T o downshift from - split - split (in the same gear) engine speed falls, move the splitter (preselect), then release and reapply the accelerator pedal. audible shift completion should heard.

T o downshift from a - split gear the next lower gear ’ s - split (in the same range) engine speed move the splitter switch you move the shift lever through NEUTRAL the next lower gear Note that the splitter switch must not actuated the position until the main box

NEUTRAL. Remember double - clutch between gears using the accelerator pedal synchronize the transmission components.

T318 and T318L Reverse — Reverse can used range only

T318LR Reverse Reverse can used and range.

T o m a k e a r a n g e s h i f t i n r e v e r s e , bring the truck a complete Flip the range selector the range desired Move the shift lever out reverse through and then back into reverse the lever moves through the range shift will

Caution

T o avoid transmission damage, NOT change range while moving https://www.truck-manuals.net/mack/

Rear Case, Side - Mounted O

Operating Procedures (T318, T318L and T318LR)

When engaging the O

Select - split using the splitter switch and select range using the range selector .

Note: The transmission MUST range and - split all times during O

Depress the clutch pedal disengage the

Set the parking brakes.

Move the main box shift lever the NEUTRAL

Move the dash - mounted compound NEUTRAL control valve the position, which moves the synchro clutch a NEUTRAL position.

Engage the

Move the main box shift lever the desired

Release the clutch pedal engage the Operate the O - driven load.

When disengaging the O —

Depress the clutch pedal disengage the

Move the main box shift lever NEUTRAL.

Disengage the

Move the dash - mounted compound NEUTRAL control valve the OFF which moves the synchro clutch back

Move the shift lever the desired main gear box ratio.

Release the parking

Release the clutch pedal engage the clutch.

Preferred Methods for Engaging T318(L)(LR) "Eighteenth" Gear (or any - range gear) for Output Shaft Driven Power T ake - f Operation

Method

After positioning the vehicle for power take - f and with vehicle wheels o f f t h e g r o u n d :

Shift the transmission NEUTRAL.

Engage power take - f drive.

Move the range selector range.

Disengage the engine clutch and select REVERSE.

Feather the clutch until the transmission range clutch engagement heard.

Disengage the engine

Select 18th speed gear for T318LR.

Engage the clutch when power take - f operation

Method

After positioning the vehicle for power take - f operation, and with vehicle wheels o n t h e g r o u n d :

Shift the transmission NEUTRAL.

Move the range selector range.

Disengage the engine clutch and select REVERSE.

Feather the clutch until the transmission range clutch engagement heard.

Disengage the engine

Engage power take - f drive.

Select 18th speed gear for T318LR.

Engage the clutch when power take - f operation