operators_manual

Table Of Contents
Peterbilt Rear Suspension U-bolts
Rear
Suspensio
n Type
U-Bolt
Diamet
er
Torque lb-ft
(N•m)
22
Low Air
Leaf (U-bolt,
spring)
M22 x
1.5
375–475 (508–
644)
Flex Air M22 x
1.5
325–375 (440–
508)
Tandem
Low Air
Leaf
M22 x
1.5
375–475 (508–
644)
Air Leaf (U-
bolt, spring)
1.0 -in.
NF
450–550 (610–
746)
Air-Trac 1.0 -in.
NF
450–550 (610–
746)
13.5K Taper
Leaf (Axle
U-bolt)
¾ -in.
16 UNF
275–320 (373–
434)
Peterbilt Rear Suspension U-bolts
Rear
Suspensio
n Type
U-Bolt
Diamet
er
Torque lb-ft
(N•m)
18K Taper
Leaf (Axle
U-bolt)
¾ -in.
16 UNF
275–320 (373–
434)
18K Air Leaf
(Axle U-
bolt)
¾ -in.
16 UNF
275–320 (373–
434)
For all non-PACCAR suspension
systems, see the manufacturer’s
operator’s manual for torque
specifications.
NOTE
The values shown here are for sus-
pension U-bolts and should not be ap-
plied to bolts and fasteners for the
frame.
Rear Suspension Fasteners
Air-Trac Fastener Torque Values
Fastener
Fastener
Name
lb•ft (N•m)
M16 Tracking
rod bolts
155–195
(210–264)
0.75 NF Spring
center bolt
165–210
(224–285)
23
M16 0.75
NF
Radius rod
bolts
(forward)
155–195
(210–264)
Radius rod
bolts (at
axle)
250–350
(339–475)
22
Torques listed are for primed (or non-oiled) U-bolts.
23
Torque requirement applies at subassembly of airspring support and leaf spring only.
MAINTENANCE - Specification Reference Charts
Y53-6126-1A1 (01/21) 307
5