FSB-234-015

SB-10043348-9765
Field Service Bulletin
Trucks
Volvo Trucks North America
Greensboro, NC USA
Date
Group
No.
Release
Page
1.2012
234
015
01
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Fuel Tank Strap Top Bolt, Tightening
VN, VHD,VT, VAH
FSB 234-015, Fuel Tank Strap Top Bolt, Tightening
(January 2012)
VOLVO Trucks is introducing new fuel tank strap top bolt tightening procedures for VN, VHD,
VT and VAH truck models. Over-tightening the tank strap top bolts may cause the D-shaped
and round fuel tanks to collapse. To prevent this condition, all top tightening fuel tank strap
top bolts have patch lock applied to address the concern of low strap torque. Blue patch
lock may be visible where the bolt enters the “T” fitting. Re-torque or checking of torque will
be inaccurate and interfere with the operation of the patch lock. The new bolt, part number
995673 (with blue patch lock) replaces the old bolt part number 995253.
Note: The new bolt must be used in combination with new T-slug (21589047), which
replaces existing T–slug (21500314). A new bolt (995673) and new T–slug (21589047) must
be installed any time the new bolt (995673) is removed or patch lock is broken free.
Note: Fuel tank straps do not require re-torqueing or checking of torque on trucks built
after January 11, 2011.
W2070221
Strap Installation and Handling
Kinking or bending of the fuel tank strap should be avoided during assembly.
Service personnel: Please circulate, read and initial
Service
Manager
Warranty
Administrator
PV729-FSB 234-015_V
Workshop
Foreman
Service Technicians
USA51103
Volvo Trucks North America
Field Service Bulletin
Date
1.2012
Group
No.
Release
234
015
01
Tank Preparation
Before mounting the fuel tank, apply a thin film of soap-water solution to the rubber surface
of the mounting strap assembly that contacts the fuel tank. The soap-water solution will
prevent kinking or bending of the tank strap and damage to fuel tank when tightening the
tank strap top bolt.
W2070222
Tank Orientation (D-Shaped Tank Shown for Reference Only)
Locate the longitudinal weld of the round or D-shaped tank casing no more than 10 mm (.39
in) above the top of the bearing plate as shown in the figure below.
W2070223
Page
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Volvo Trucks North America
Field Service Bulletin
Date
1.2012
Group
No.
Release
234
015
01
Fuel Tank Strap Top Bolt Torque Sequence (D-Shaped Tanks Shown for Reference)
Tighten the fuel tank strap top bolts in sequence as shown in figure below. The same torque
sequences apply to the D-shaped and round tanks.
Note: To prevent crushing the fuel tank, do not tighten fuel tank straps to specification
during the initial torque sequence. The initial torque values for the fuel tank straps are
51 ± 7 Nm (38 ± 5 ft-lb) for round tanks and 98 ± 7 Nm (72 ± 5 ft-lb) for D-shaped fuel
tanks. Following the initial torque sequence, tighten the fuel tank straps to the final torque
specification shown below.
Note: When tightening two or three strap assemblies, tighten fuel tank strap number 1 to the
initial torque value, followed by strap number 2, and strap number 3. Then re-tighten the fuel
tank straps in sequence to specification as shown below.
Note: When tightening four fuel tank strap assemblies, tighten fuel tank strap number 1 to
the initial torque value, followed by tank strap number 2, 3, and 4. Then re-tighten the fuel
tank straps in sequence to the final torque specification shown below.
Fuel Tank Strap Top Bolt Final Torque Specifications
Tighten round fuel tank strap top bolts to 75 ± 7 Nm (55 ± 5 ft-lb)
Tighten D-shaped fuel tank strap top bolts to 110 ± 7 Nm (80 ± 5 ft-lb)
W2070224
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