31–01 Frame Fastener Torque
Checking
Because of "bedding in" (or seating), the frame fas-
teners must be torqued at the recommended inter-
vals. These intervals apply to new vehicles, and to
frame fasteners that have been removed and in-
stalled.
NOTE: For off-highway operations, retorque the
frame fasteners the first 1000 miles (1600 km),
then periodically, depending on the operating
conditions.
CAUTION
Continued vehicle operation with insufficiently
tightened fasteners could result in bracket or
frame damage.
Typical frame fastener applications include front
frame brackets, suspension brackets, spring brack-
ets, fuel tank, exhaust and engine supports, frame
crossmembers and gussets, and fifth wheel mounting
brackets.
See Group 00 of the
Business Class
®
Trucks Ser-
vice Manual
for additional information on fasteners
and torque values.
Tighten all Freightliner AirLiner suspension fasteners
to the torque values in Table 1. Also, tighten all sus-
pension air line fittings and air lines.
Freightliner Airliner Suspension
Torque Values
Description Size
Torque
lbf·ft (N·m)
Leveling Valve Adjustment Nut 1/4–20 5 (7)
Leveling Valve Mounting Bolt
Nuts
5/16–18 14 (19)
Air Spring Upper Mounting
Locknuts
3/4–16 45 (61)
1/2–13 23 (31)
Air Spring Lower Mounting
Locknuts
1/2–13 55 (75)
Leaf Spring Mounting Eye Bolt
Locknuts
3/4–16 270 (365)
Shock Absorber Upper Bracket
Mounting Locknuts
5/8–11 125 (170)
Freightliner Airliner Suspension
Torque Values
Description Size
Torque
lbf·ft (N·m)
Air Spring Upper Mounting
Bracket
5/8–11 125 (170)
Spring Hanger Mounting
Locknuts
3/4–10 210 (285)
Lateral Control Rod Nut 5/8–11 185 (136)
Table 1, Freightliner AirLiner Suspension Torque
Values
Tighten Hendrickson suspension fasteners to the
torque values given in Table 2.
Hendrickson Suspension
Torque Values
Description Size
Torque
lbf·ft (N·m)
Top Pad to Spring
Aligning Setscrew
(RT/RTE)
— 100–150 (135–200)
Top Pad Nut
(RT/RTE)
— 275–400 (375–542)
U-Bolt Locknut (U/UE) 7/8–14 237–302 (321–409)
Spring Pin Locknut 1/2–13 45–63 (61–85)
Torque Rod Straddle
Mount Nut
5/8–11 190 (260)
Torque Rod Stud
Locknut
1-1/4–12 175–225 (235–305)
Saddle Cap Stud
7/8–14
55–65 (75–90)
3/4–16
Saddle Cap Locknut
(RT/RTE)
7/8–14 225–275 (305–373)
Saddle Cap Locknut
(U/UE)
3/4–16 125–145 (169–197)
Adapter-Type Beam
End Locknut
3/4–16 210–240 (285–325)
Spring Center Bolt
7/16–20 50–60 (70–80)
1/2–20
65–75 (90–100)
1/2–13
Rebound Spacer
Locknut
1/2–13 38–45 (51–61)
Spring Alignment Clip — 15 (20)
Frame and Frame Components 31
Business Class Trucks Maintenance Manual, December 2002 31/1
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