Navistar WorkStar Series, Operator'S Manual

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Maintenance Intervals And Specifications
SPRING U-BOLT CHECKS
Check U-Bolt Nuts and re-torque every 36,000 miles (57, 936
km) after initial 1,000 mile re-torque.
LIFT AXLE TORQUE CHARTS
Fixed Axle U-Bolt Torque
The U-Bolts must be tightened and torqued using the following
cross pattern sequence and illustration. The U-Bolt Torque chart
applies only to Fixed lift axles.
1. Tighten 1 and 4 to partial torque.
2. Tighten 2 and 3 to partial torque.
3. Repeat steps 1 and 2 tightening all four bolts to full torque.
Lift Axle U-Bolt Nut Torque Chart
U-Bolt Size
(UNF – Grade 8)
Size in inches
3/8 1/2 5/8 3/4 7/8 1 1 1/8
Min. Torque
(lbf-ft)
15 40 120 200 400 650 800
Max. Torque
(lbf-ft)
20 60 150 250 450 750 900
NOTE: Torque values DO NOT apply to air springs or lower
grade fasteners.
The following chart applies to both Steerable and Fixed Lift
Axles.
Capscrew/Bolt Torque Chart
Capscrew-
Bolts (UNF –
Grade 8) Size
in inches
3/8 1/2 5/8 3/4 7/8 1 1 1/8
Min. Torque
(lbf-ft)
25 50 150 300 500 700 900
Max. Torque
(lbf-ft)
35 75 200 350 550 800 1000
NOTE: Torque values DO NOT apply to U-BOLTS.
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