Page 41 - BPW axles with air suspension Series O SL AL
P. 41
Under-slung Version (with the trailing arms under the axle) 7.3.2
T Trraaiilliinngg aarrmmss uunnddeerr tthhee aaxxllee
1. Insert the axle into the fixture in the rear Tightening torques, see last page.
position at the hub flanges. All contact surfa- When mounting the spring without the fixture,
ces on the axle beam and axle connection the permitted tolerances of the spring eye
must be clean and free from weld spatter.
centre, spring eye height, spring length and
2. Place the spring pads in the correct position rectangular alignment must be measured.
on the axle beam.
10. When mounting with a tracking plate,
3. Mount trailing arms - including catch illustration 4.1 / 4.2:
plate for single-leaf springs - on the spring Weld the tracking plates onto the rear end of
eye with pin ∅ 30 (∅ 24 for Airlight II air the spring plates or spring pads after
suspension units from build year 9/2007 installation and alignment of the air suspen-
onwards). sion axles on the vehicle. Weld a 4 x 80.
4. Mounting without tracking plate (only with
single-leaf spring for centring pin):
Insert the trailing arms into the spring pads. R Reemmaarrkk::
Insert the centring pin into the trailing arm /
catch plate hole.
With the introduction of the Airlight II air suspen-
4.1 Mounting with tracking plate: sion, a second spring U-bolt with M 22 (32 mm)
(with single-leaf trailing arm for centring pin): was launched onto the market in addition to the
Insert the trailing arms into the spring pads. familiar M 23 spring U-bolt (36 mm).
Insert the tracking plates 05.281.... into the
trailing arm / catch plate holes with the cen- This Airlight II axle connection with spring U-bolt
tring pins mounted. diameter M 22 (32 mm) is tightened with a torque
4.2 For single and double-leaf trailing arms with and angle process controlled by the tensile yield
spring bolt: strength. This has the advantage that the Airlight
Insert tracking plates 03.281.... into the spring II air suspension is maintenance-free in on-road
pads. Insert the trailing arms into the spring applications.
pads.
In all other air suspension types and in Airlight II
5. Lay the segment plates (spring plates) on the
square profile centring frames of the axle air suspension systems used off-road, the U-bolt
beam and mount the spring U-bolt. connections have to be checked regularly and
retightened if necessary because of the high
6. Fit the spring plates.
loadings.
7. Grease the spring U-bolt thread, fit washers
and screw on the lock nuts by hand. This involves checking the U-bolt connection is
firmly tightened at the specified intervals. For
8. Use a driver to tighten the lock nuts slightly -
always one spring U-bolt at a time - until all more information about the maintenance intervals,
components make even contact. (The spring please refer to the applicable maintenance regula-
pads only make contact at the radius of the tions or workshop manuals.
axle beam.) There must be no uneven
tensioning due to one-sided tightening The specified tightening torques are mandatory in
of the lock nuts. order to prevent damage to the components.
9. Use a torque wrench to tighten the lock nuts
in several cycles - always one spring U-bolt
at a time - until the prescribed tightening
torque is reached. Make sure the spring eyes I Immppoorrttaanntt ffoorr aallll wweellddiinngg wwoorrkk!!
are at the same height! The pins in the spring
eyes must slide easily out of the fixture! The trailing arms, air bags and plastic pipes
Otherwise, the connection must be corrected must be protected against flying sparks and
by loosening and retightening the spring weld spatter during all welding work. The earth
U-bolts. Now the hanger brackets and shock terminal must never be attached to the trailing
arm or the hub. Do not perform any welding on
absorbers can be mounted.
the trailing arms!
Now the hanger brackets and shock
absorbers can be mounted.
BPW-EA-Luft 1023701e 41
