freightliner M2 Plus - Tuftrac Suspension Gen2 I-Bolt Torque Checking

NOTICE
Failure to retorque the U-bolt nuts could result in
spring breakage and abnormal tire wear.
Check the U-bolt torque of both the front and rear
axles and suspension spring packs, where
applicable.
1. Park the vehicle on a flat surface and apply the
parking brakes. Chock the tires to prevent the
vehicle from moving.
2. Check the U-bolt torque in a diagonal pattern.
Set a click-type torque wrench to the highest
torque value for the fastener being checked. See
Table 1 for U-bolt torque specifications. Turn the
wrench in a clockwise motion (looking up) until
the torque wrench clicks.
Spring Assembly U-Bolt High Nut Torque Values
*
Size Torque: lbf·ft (N·m)
5/8–18
Stage 1: Hand-tighten
Stage 2: 60 (81)
Stage 3: 200 (271)
Stage 4: 180 to 230 (245 to 313)
Spring Assembly U-Bolt High Nut Torque Values
*
Size Torque: lbf·ft (N·m)
3/4–16
Stage 1: Hand-tighten
Stage 2: 60 (81)
Stage 3: 200 (271)
Stage 4: 270 to 330 (367 to 449)
7/8–14
Stage 1: Hand-tighten
Stage 2: 60 (81)
Stage 3: 200 (271)
Stage 4: 420 to 500 (571 to 680)
1–14
Stage 1: Hand-tighten
Stage 2: 60 (81)
Stage 3: 200 (271)
Stage 4: 520 to 600 (707 to 816)
M20–1.5
Stage 1: Hand-tighten
Stage 2: 60 (81)
Stage 3: 200 (271)
Stage 4: 268 to 329 (364 to 446)
*
Tighten in a diagonal pattern as shown in Fig. 8.
Table 1, Spring Assembly U-Bolt High Nut Torque
Values
32–03 TufTrac Suspension
Gen2 I-Bolt Torque
Checking
NOTICE
Failure to check I-bolt torque values could result
in spring breakage and abnormal tire wear.
Check the I-bolt torque of both the front and rear
axles, where applicable.
09/27/95
f320432
1
A
B
A. Non-wear Area B. Wear Area
1. Walking Beam
Fig. 7, Walking Beam End Wear Thickness
f32078310/05/2016
1
23
4
Fig. 8, Tightening Pattern for U-Bolt High Nuts
Suspension 32
Business Class M2 Plus Maintenance Manual, 02/10/2023 32/7