Iveco Stralis AT/AD. Manual — part 265
Figure 159
38357
Figure 160
Figure 161
Take apart the automatic adjustment units.
Carefully clean all the single parts forming the braking
assemblies. Check the state of wear of the adjustment bushing
teeth (2 and 3), seeing they (2) slide properly when screwing
onto the adjustment pins (1).
Check the state of the springs (4) and thrust pins (5).
Check the seats of the thrust pins (5) on the brake body;
replace the brake body if you find any scoring, dents or too
much wear.
35711
For Rockwell type brakes
Disassemble the automatic adjustment unit.
Unscrew the adjustment bushes (3) from the adjustment pins
(2) and then remove the seals (1).
Check the wear condition of the adjustment bush outer helical
toothing and check whether bushes are sliding freely on the
relevant adjustment pins when screwing.
Figure 162
38360
Check the condition of the pressure pin teeth (3), of the
relevant compression springs (2) and of the copper washers
(1).
Take seal (1) off thrust pin (2). Check wear conditions for
thrust pin (2) and surfaces of sloping planes (3) subjected to
the operation of shoe opening drive rollers.
71786
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118
AIR SYSTEM - BRAKES
Base - January 2003
Figure 163
Figure 164
35713
Check that the wedge assemblies run smoothly and the parts
are not scratched.
!
If the parts forming the wedge units are worn, you
need to replace the entire wedge unit.
40520
Measure the diameter of the drums with a sliding gauge
without angling the arms. Measure the diameter at several
points to determine the roundness and state of wear.
Fit the tool 99372213 (2) in the brake drum (1).
Key this assembly onto the shaft of the lathe 99301001 (3).
Fit a set of spacers onto the shaft eliminating the end float of
the assembly. Screw down the locking nut and fit on the lathe
mount.
Fit the anti-vibration band onto the brake drum.
Turn the drums, removing the necessary amount of material in
several stages to eliminate the flaws found.
After turning, remove the brake drum from the lathe and clean
it carefully.
527231
Turning drums
!
Couple the appropriate brake linings for each single
drum according to the oversize.
Each of the vehicle’s axles must be equipped with
linings of the same type.
!
The highest permitted diameter for the drums is given
on the drum itself.
This limit must never be exceeded as this would
impair the braking effect and the strength of the
drums.
AIR SYSTEM - BRAKES
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For Rockwell type brakes
Figure 165
77085
Remove the worn brake linings from the shoes with the
compressed air press 99305087 (1).
Put the entire shoes (4) on the adjustable plate (5).
With the chisel (2) in the operating head of the press (1), cut
off the heads of the rivets (3).
Eject the rivets from the shoes.
Thoroughly clean the shoes by washing and blowing.
!
From the bottom shoes or the tongues of the clip (6)
freeing the bushing (7). Now remove the lining wear
gauge (8) with the associated cable.
Figure 166
Figure 167
Fit the supporting pin (5) on the mobile mount (4) of the press.
Rivet the brake linings (3) onto the shoes (2) using the drift (1)
inserted in the operating head of the press.
!
The right way to rivet the brake linings is to start from
the middle and gradually move towards the outside
of the braking sectors.
17256
527233
Replacing brake linings
Fit on the lining wear cable by carrying out the procedures
described for removal in reverse order.
40519
Grease the parts (1, 2 and 3) and insert them, in sequence,
onto the thrust pin (4).
Grease the inside of the brake body (5) and fit the thrust pins
(4) fastening them with the guide pins (6 and 7).
35714
Reassemble the adjustment units, greasing the sliding surfaces
properly.
Assembly
For Perrot type drum brakes
Figure 168
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AIR SYSTEM - BRAKES
Base - January 2003
Figure 169
38364
Figure 170
36755
Figure 171
60220
Figure 172
36755
Fit the seals (2) on the units of the adjustment pins (1). Grease
the thread of the pins (1).
Fully screw down the adjustment bushings (3) and grease
them thoroughly on the outside diameter.
Grease the inside diameter of the thrust pins (4).
!
When repairing the brakes, replace the seals of the
reaction and thrust pins.
To lubricate the components, use Rockwell RBSK
0253 grease.
Fit thrust pins (1) inclined by 15
° towards the main shoe and
thoroughly grease inside support diameters.
Screw component (1) and fit it in the thrust pin (6). Grease
the interior of the brake body (5) and fit thrust pins (6) so that
the slot is facing the guide pins (4).
Grease and fit complete guide pins (4) in brake body seats (5);
check whether washers (2) are fitted and screw some turns.
!
Guide pins (4) shall be fitted so that prongs (3) can
slide in the proper brake body hole seats (5).
For Rockwell and Perrot type brakes
Inset the adjustment units (1) into the brake body (3), facing
the clip as shown in the figure.
Fit the protective cap (2) into the groove of the brake body (3).
AIR SYSTEM - BRAKES
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For Rockwell type drum brakes
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