Peterbilt Medium Duty Trucks Operator's Manual after 1-07
Peterbilt Medium Duty Trucks Operator's Manual after 1-07
Peterbilt Medium Duty Trucks Operator's Manual after 1-07
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Rear Axle and Suspension<br />
WARNING! Do not replace U–bolts and nuts with<br />
common U–bolts or standard nuts. These parts<br />
are critical to vehicle safety. If the wrong U–bolts<br />
or nuts are used, the axle could loosen or separate<br />
from the vehicle and cause a serious injury<br />
accident. Use only U–bolts and nuts of SAE<br />
Grade 8 specification or better.<br />
WARNING! Do not operate the vehicle if the U–<br />
bolts are not properly tightened. Loose U–bolts<br />
do not properly secure the axle to the suspension.<br />
This could cause loss of vehicle control<br />
and an injury accident. Loose U–bolts can also<br />
cause uneven tire wear and poor alignment.<br />
Suspension alignment should be checked when any one of<br />
the following conditions exist:<br />
• Discovery of loose suspension fasteners (Any<br />
torque below the recommended torque value.).<br />
• Discovery of elongated holes in a suspension component.<br />
• Bushing replacement.<br />
• Excessive or abnormal tire wear.<br />
NOTE: To ensure an accurate torque reading, use<br />
properly maintained and calibrated torque<br />
wrenches.<br />
Preventive Maintenance<br />
Grade 5 Capscrew Torque Specifications<br />
Capscrew Body<br />
Torque<br />
Size<br />
(inches-thread)<br />
Lb. ft. N.m.<br />
1/4-20 6—9 8—12<br />
-28 7—10 9.5—14<br />
5/16-18 13—18 18—24<br />
-24 14—20 19—27<br />
3/8-16 22—32 30—43<br />
-24 25—40 34—54<br />
7/16-14 35—50 47—68<br />
-20 39—56 53—76<br />
1/2-13 54—77 73—104<br />
-20 58—87 79—118<br />
9/16-12 78—111 105—151<br />
-18 87—124 118—168<br />
5/8-11 108—154 147—209<br />
-18 122—174 166—236<br />
3/4-10 192—273 260—370<br />
-16 214—305 290—414<br />
7/8-9 309—441 419—598<br />
-14 341—486 462—659<br />
1 -8 464—662 629—898<br />
1-12 508—724 689—982<br />
– 216 – Y53-6008 <strong>Medium</strong> <strong>Duty</strong> (R10/06)