Peterbilt 579 Operator's Manual page 341

Every 60,000 miles or 6 months:
•
Refer to specific manufacturer's
literature for any special
instructions.
•
Remove fifth wheel from vehicle.
Refer to the Shop Manual, "Fifth
Wheel Removal."
•
Steam clean the fifth wheel and
mounting brackets.
•
Check all moving parts for
excessive wear or damage.
Replace all worn or broken parts.
•
Complete two-month service
procedure.
•
Install fifth wheel. Refer to
the Shop Manual, "Fifth Wheel
Installation."
(04/13)
Frame Fastener Torque
Requirements
Tighten all frame fasteners with a
torque wrench. Torque specifications
apply to the following fasteners with
lightly lubricated threads.
NOTE
Whenever possible, torque all frame
fasteners on the nut end, not the bolt
head.
Y53-6047–2C
Standard Grade 8 UNF or UNC and Metric
FASTENER TORQUE *
SIZE
Nm
5/16 22-30
3/8 41-54
7/16 75-88
1/2 109-122
9/16 156-190
5/8 224-265
3/4 394-462
7/8 517-626
1 952-1,129
1-1/8 1,346-1,591
1-1/4 1,877-2,217 1,380-1,630
METRIC WITH NYLON INSERT NUTS
M5 8-12
M6 9-15
M8 23-31
M10 33-43
M12 75-101
M16 163-217
M20 352-460
* ESNA Style Lock Nut, with nylon insert.
Lubricate nylon insert nut lightly with SAE
20/30 oil.
FRAME
Lb-Ft
16-22
30-40
55-65
80-90
115-140
165-195
290-340
380-460
700-830
990-1,170
6-9
7-11
17-23
5
24-32
55-75
120-160
260-340
5-105