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31–01 Frame Fastener Torque
Checking
Because of "bedding in" (or seating), frame fasteners
must be torqued at the recommended intervals.
These intervals apply to new vehicles, and to frame
fasteners that have been removed and installed.
NOTE: For off-highway operations, retorque
frame fasteners the first 1000 miles (1600 km),
then periodically, depending on operating condi-
tions.
CAUTION
Make sure frame fasteners are properly tightened.
Continued vehicle operation with loose fasteners
could result in bracket or frame damage.
NOTE: Engine supports on vehicles built from
January 2007 do not require checking.
Typical frame fastener applications include front
frame, suspension, and spring brackets; fuel tank,
exhaust, and engine supports; frame crossmembers
and gussets; and fifth wheel mounting brackets.
For additional fastener and torque value information,
see Group 00 of the
Acterra
®
Workshop Manual
.
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 Torque Values
Description Size
Torque:
lbf·ft (N·m)
Leveling Valve Adjustment Nut 1/4–20 5 (7)
Leveling Valve Mounting Nuts 5/16–18 14 (19)
Air Spring Upper Locknuts
3/4–16 45 (61)
1/2–13 23 (31)
Air Spring Lower Locknuts 1/2–13 55 (75)
Leaf-Spring-Eye Locknuts 3/4–16 270 (365)
Shock Absorber Upper Bracket
Locknuts
5/8–11 125 (170)
Air Spring Upper Bracket 5/8–11 125 (170)
Spring Hanger Locknuts 3/4–10 210 (285)
Lateral Control Rod Nut 5/8–11 185 (136)
Table 1, Freightliner AirLiner 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)
Fore and Aft Torque
Rod Mount Nut
— 95 (130)
Table 2, Hendrickson Suspension Torque Values
All Hendrickson beam end fasteners must maintain
their torque values to firmly clamp the rubber bushing
inner metal tubes to the beam hanger legs.
WARNING
Insufficient beam end fastener torque could cause
the beam to separate from the axle. This will
cause loss of vehicle control resulting in property
damage, serious personal injury or death.
Tighten the nut (see Fig. 1) to the torque value in
Table 2. Do not over-torque.
Frame and Frame Components 31
Acterra Maintenance Manual, January 2007 31/1