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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Preventive Maintenance<br />
Torque<br />
CAUTION: Do not spray the suspension with<br />
chemical products or mineral oil; it can cause<br />
damage to the bushings.<br />
U–Bolts, Spring and Shackle Pinch Bolts<br />
It is important that U–bolts remain tight. Severe use of your<br />
vehicle will cause them to loosen faster. But all vehicles need<br />
to have their U–bolts checked and tightened regularly. See<br />
“Maintenance Schedule” on page 123. Be sure someone<br />
with the proper training and the right tools checks and tightens<br />
the U–bolts on your <strong>Medium</strong> <strong>Duty</strong>.<br />
New springs can “settle in” <strong>after</strong> service, relieving the tension<br />
on the U–bolts. Loose U–bolts can cause leaf spring breakage,<br />
axle misalignment, hard steering and abnormal tire<br />
wear.<br />
• All vehicles should have suspension U–bolts tightened<br />
<strong>after</strong> the first 500 miles (800 km) of operation. Torque the<br />
front suspension U-bolts to 245-300 lb. ft. (333-408<br />
N.m.)<br />
Front Axle and Suspension<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 />
U–bolts are difficult to tighten unless you have the right<br />
equipment. If you cannot tighten them correctly yourself, be<br />
sure to have them checked and tightened regularly by an<br />
authorized mechanic.<br />
WARNING! Do not replace U–bolts and nuts with<br />
common U–bolts or standard nuts. Use only U–<br />
bolts and nuts of SAE Grade 8 specification or<br />
better.These parts are critical to vehicle safety. If<br />
the wrong U–bolts or nuts are used, the axle<br />
could loosen or separate from the vehicle and<br />
cause a serious injury accident.<br />
• At the same time U-bolts are tightened, re-torque the<br />
spring and shackle pinch bolts to 105 lb. ft. (142 N. m.)<br />
<strong>Medium</strong> <strong>Duty</strong> (R10/06) Y53-6008 – 211 –