Kenworth T410, Руководство водителя

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Page 284 CAT: 8612 November 2019
PREVENTIVE MAINTENANCE
Tighten U-bolt nuts to the specified torque value with the vehicle loaded
to its normal gross weight.
The torque values below apply to U-bolts and nuts with clean threads
lubricated with Chevron zinc lubricant SAE 20 or 30 oil.
Do not operate the vehicle if the U-bolts are not properly tightened.
Loose U-bolts will cause the axle to not be properly secured to the
suspension, which could cause loss of vehicle control and an injury
or accident. Loose U-bolts can also cause uneven tyre wear and
poor alignment.
Torque all fasteners on the nut end. For off-highway vehicles, tighten the
U-bolts after the first day or two of operation. Then check weekly. Load
the vehicle to its normal gross weight before tightening U-bolts. Loading
the vehicle ensures proper adjustment of the U-bolt and spring assembly.
To ensure an accurate torque reading, use properly maintained and
calibrated torque wrenches. Clean the nut and bolt. No dirt, grit or rust
should be present.
Do not replace U-bolts and nuts with common U-bolts or standard
nuts. These parts are critical to vehicle safety. If the wrong U-bolts
or nuts are used, the axle could loosen or separate from the vehicle
and cause a serious accident. Use only U-bolts and nuts of SAE
Grade 8 specification or better.
Never re-use a self-locking nut.
Spring Suspension U-Bolts Grade 8
U-BOLT Size Diameter
(Inch Dimensions) Torque
ft.lb. Nm
¾” UNF Dry 284-340 386-461
¾” UNF Lubricated 245-300 333-408
7
/
8
” UNF Lubricated 440-540 598-734
1” UNF Lubricated 680-780 925-1060