200 OPERA TION

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Preferred Methods for Engaging T318(L)(LR)21 "Eighteenth" Gear (or any - range gear) for Output Shaft Driven Power T ake - f (PT 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 T318L(R)21.

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 T318L(R)21.

Engage the clutch when power take - f operation

Axles

Rear Axles Other Than MACK

Please refer the operators manual provided with your vehicle for axles other than

MACK Rear Axles

Mack T rucks, Inc. provides axle housings three capacity classifications:

• Medium Duty

• Heavy Duty

• Extra - Heavy Duty

T o deliver the appropriate amount torque the driving wheels, MACK fers dual - reduction carriers a variety ratios.

Mack T fers a large variety four - wheel - drive tandem axles with top - dual - reduction carriers (for straight line through Carriers are also available a large number

All four - wheel - drive tandem carriers are available with the MACK inter - axle power divider third dif ferential (with without a power divider

MACK rear axles are designed the entire load carried the axle housing (through the wheel bearings mounted the housing spindle). The rear axle shafts are either free - splined (both ends) integral flange type. Both types axle shafts can removed without removing disturbing the rear wheels.

T o avoid excessive tire wear , proper maintenance must practiced and rear axle tires must

Caution

The maximum safe operating oil temperatur e for a MACK r ear axle 121°C (250°F) for mineral - based and 148°C (300°F) for synthetic - based Continued operation with oil above this temperatur e will r esult rapid deterioration the s lubricating operties and NOT r

Inter - Axle Power Divider Lockout (If Equipped)

The MACK power divider can rendered inoperative, during short periods poor traction, using a power divider lockout. When the power divider lockout engaged, both axles are locked together (in positive through - drive) for maximum traction with dif ferential action between axles. not necessary stop the vehicle engage the power divider lockout. The lockout may engaged while the vehicle moving less than mph, long the wheels are not spinning.

Caution

not engage the power divider lockout the wheels e

Note: Even when traction available the spinning the driver can "feather" the brakes (apply the brakes slightly), creating enough resistance that wheel allow power the axle with Feathering brakes should not done with power divider lockout engaged.

Note: For vendor axles, see the vendor manual furnished with the vehicle.

Engaging the Power Divider Lockout

Normally , the Power Divider switch the OUT (disengaged) poor traction may necessary provide positive through - drive both axles flipping the switch the locked (engaged)

Push switch engage.

Momentarily release the accelerator pedal allow the shift take then drive through the slippery

Note: A lockout indicator lamp will remain lit long the lockout This remind the driver release the lockout soon normal traction regained.

When driving conditions unlock the power divider moving the Power Divider switch back the OUT (disengaged) Then release the accelerator pedal momentarily (to shift out the locked position) and drive

Caution

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NOT (under any cir cumstances) engage disengage the lockout while the drive wheels e actually slipping spinning; clashing between the lockout sliding clutch and the outer cam may r