operators_manual

Table Of Contents
Do NOT lubricate all-metal lock-
nuts.
Bolts and washers can be reused,
but nuts can only be reused once.
If in doubt, install new nuts.
If a bolt must be replaced the nut
installed on it must also be
replaced.
Fasteners must be torqued from
the nut to achieve correct clamp
load.
Metric Fastener
Size (with all
METAL Lock-
nuts)
Tightening
Specification lb-ft
(N•m)
M10 29-41 (39.4-55.6)
M12 51-69 (69.1-93.5)
M16 125-165
(169.5-223.7)
M20 230-300
(311.8-406.8)
Suspension U-Bolts, Grade 8
Tighten all U-bolts with a torque wrench.
Torque requirements in the table below
apply to PACCAR proprietary suspensions
using Protec Torque/TEXO coated U-bolts,
only. For all other suspensions, follow the
manufacturer's recommended torque
values. PACCAR proprietary suspension u-
bolts must be tightened in a specific
sequence. Take your vehicle to an
authorized dealer to tighten the U-bolts on
your vehicle.
Torque for Grade 8 U-Bolts
Peterbilt Front Suspension U-bolts
U-Bolt Size
Diameter (-
in.)
Torque (lb-
ft)
Torque
(N•m)
3/4 260-290 353-393
7/8 370-415 502-563
For all non-PACCAR suspension
systems, see the manufacturer’s
operator’s manual for torque
specifications.
MAINTENANCE - Specification Reference Charts
306 Y53-6126-1A1 (01/21)
5