Western Star 47X 2020, Maintenance Manual

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f321234 06/29/2016
A
Measure Point
Suspension Height Measurement
Min Target Max
A = Measure Here
2-3/4 inch
(70 mm)
3 inch
(76 mm)
3-1/4 inch
(83 mm)
Table 5, Suspension Ride-Height Measurement, Dual-
Leaf Spring, 46k High Ride
32–02 Suspension U-Bolt
Torque Check
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/rear axles
and suspension spring packs where applicable.
1. Park the vehicle on a level surface, shut down
the engine and set the parking brake. Chock the
tires.
2. Check the U-bolt torque. See Table 6 for U-bolt
torque specifications. Tighten in a diagonal pat-
tern as shown in
Fig. 3 . Set a click-type torque
wrench to the mid-point torque value for the fas-
tener being checked. Turn the wrench in a clock-
wise motion (looking up) until the torque wrench
clicks, then release pressure on the torque
wrench, and turn the wrench again until it clicks.
If the nut turns on the second application, the
bolt is stretching and must be replaced. See
Group 32 of the Western Star 47X and 49X
Workshop Manual for bolt replacement
procedures.
Spring U-Bolt High Nut Torque Values
*
Size Torque: lbf·ft (N·m)
5/8–18
Stage 1: Hand-tighen
Stage 2: 60 (81)
Stage 3: 200 (271)
Stage 4: 180 to 230 (245 to 313)
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: 420–500 (571 to 680)
1–14
Stage 1: Hand-tighen
Stage 2: 60 (81)
Stage 3: 200 (271)
Stage 4: 520–600 (707 to 816)
M20-1.5
Stage 1 : Hand tighten
Stage 2: 60 (81)
Stage 3 : 200 (271)
Stage 4 : 268–329 (364 to 446)
*
Tighten in a diagonal pattern as shown in Fig. 3 .
Table 6, Spring U-Bolt High Nut Torque Values
f320783 10/05/2016
1
2 3
4
Fig. 3, Tightening Pattern for U-Bolt High Nuts
Suspension
32
47X and 49X Maintenance Manual, February 2021
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