TM-9-2320-273-10

TRUCK, TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER

TECHNICAL MANUAL; OPERATOR’S MANUAL

DECEMBER 2012

TM-9-2320-273-10 - Page 191 of 452

EFFICIENT AND ECONOMICAL DRIVING TECHNIQUES (M915A1) - CONTINUED

WARNING

Never downshift to a gear range lower than the tractor road

speed on slippery pavement. Sudden increase in engine rpm

may cause drive wheels to lose traction with pavement and

result in loss of control of tractor or jackkniﬁng of trailer.

Failure to comply may result in damage to equipment and

injury or death to personnel. Seek medical attention in the

event of an injury.

Do not use engine retarder on slippery road surfaces. Using

engine retarder on wet, icy, or snow covered roads may

result in loss of vehicle control. Failure to comply may result

in damage to equipment and injury or death to personnel.

Seek medical attention in the event of an injury.

NOTE

Engagement of differential lockup may be helpful on

slippery pavement (WP 0005).

4. The engine retarder should never be used on slippery surfaces such as wet, icy, or

snow covered pavement. Initial braking force when applying the engine retarder

may cause tractor drive wheels to lose traction with road surface. Use service

brake pedal and/or trailer brake hand control when slowing or stopping tractor on

slippery surfaces. Refer to Trailer Brake Hand Control, in this work package and

Snow and Ice in Unusual Terrain Operation (WP 0018).

END OF TASK

Figure 16. Accelerator and Engine Retarder Control Pedals.

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