Adjusting The Brake Linkage [6] - Bottarini GDP21 Maintenance And Operating Manual

15. Undercarriage
* If necessary, adjust the position of the
balance [10] and control cables [11]; in
the case of tandem trailers, also adjust
the master compensator [9] on the
linkage [6].
* The compression spring [7] may only
be lightly pre-tensioned and must not
become fully compressed when
activated!

15.5.5 Adjusting the brake linkage [6]

Adjust the brake linkage [6] so that it is
free of play longitudinally, without initial
tension (reversing lever [4] free of play).
Readjustment
* Operate the handbrake lever [3]
powerfully several times in order to
settle the braking system.
* Check the position of the brake
compensating balances [9 and 10]
which should be at right angles to the
direction of towing
*
Check the play in the linkage [6]; if
necessary, adjust the linkage [6] again
so that it is free of play, but without
initial tension
Slight play in the bowden cable [14]
must persist.
* Check the position of the handbrake
lever [3];
when checking the dead centre of the
lever, resistance starts 10-15 mm
above dead centre
* Check that the wheels rotate freely with
the brake released.
Final check
* Check fastenings for security (secure
the hexagon locking nuts of the screw
fastenings for the transmission system,
control cables, brake compensators,
turnbuckle, linkage, etc.).
*
Check the bowden cable for slight play
[14]; if neccessary, adjust the
*
Check the compression spring [7] for
initial tension.
Test run
*
If necessary, carry out 2-3 brake tests
Brake test
* Recheck the play in the brake linkage
[6] and, if necessary, readjust the
linkage [6] for length free of play (
during operating braking with empty
trailer should be used maximally 1/2 of
the overrun travel )
15.6 Readjusting the braking
system
In general, readjusting the wheel brakes
adequately serves to readjust the braking
system, i.e. to compensate for brake lining
wear. To readjust the wheel brakes,
proceed as described under 'Adjusting the
braking system'. Check the play in the
linkage [6] and readjust if necessary.
Attention
* Check the expanding locking
mechanism and control cable [11]
* The expanding lock compensator
must not be pre-tensioned in the
brake.
*
Do not attempt to compensate for
ease of movement caused by brake
lining wear by readjusting (shorten-
ing) the brake linkage [6], e.g. by
way of the linkage screw fastenings
Readjustment
* Operate the handbrake lever [3]
powerfully several times in order to
settle the braking system
* Check the position of the brake
compensating balances [9 and 10]
(which should be at right angles to the
direction of towing).
* Recheck the play in the linkage [6];
if necessary, adjust the linkage [6]
again so that it is free of play, but
without initial tension.
* Check the positions of the handbrake
lever [3], the play in the bowden cable
and compression spring [7] (only light
initial tension);
* when checking the dead centre of the
lever, resistance starts 10-15 mm
above dead centre
Final check
*
Check the screw fastenings for the
transmission system (control cables,
cable.
brake compensators, linkage, etc.).
* during operating braking with empty
trailer should be used maximally 1/2 of
the overrun travel
* Check tthe bowden cable for slight play
[14]; if neccessary, adjust the cable.
* Check the tension of the compression
spring [7]
15.7 Maintenance and care
KNOTT – overrun systems
* The overrun system must be lubricated
with lithium-soap grease by way of the
grease nipples and at all the moving
parts.
a) every 5000 km (3000 miles)
b) or every 6 months
c)
or if they become stiff
* Inspect the bellows for damage,
replace if necessary
*
Replace the overrun shock absorber
every 20,000 km (12,500 miles) or
every 3 years at the latest.
* Check the play at the coupling point
every 20,000 km (12,500 miles). If the
play exceeds 3 mm, replace the guide
bearing or drawbar.
* Check the tightening torques of the
fastening screws at the guide bearing
every 5000 km (3000 miles);
Screws with grease nipple
50 +5 Nm
Screws without grease nipple
80 +5 Nm
* Check the tightening torques at the
clamping block of the drawbar and
clamping socket (drawbar tube - axle
joint) every 5000 km (3000 miles);
M12 screws 80 +5 Nm
M14 screws 90 +10 Nm
* Check that the braking system is
correctly adjusted every 5000 km
(3000 miles).
Vertically adjustable drawbars
Clean the faces of the tooth systems
free of fretting rust or other contamination
at least once a year in order to maintain a
good fit.
Lubricate the threaded bolts and joints
once a year or at any time if they become
stiff.
Attention
Do not grease the tooth system!
If desired, a lifting and adjusting system
can be installed between the drawbar
and the overrun system. The control arms
of the adjusting system permit swivelling
about an angle of -10° to +49° in six
positions. In every case, the overrun system
or drawgear always remains horizontal.
An integral gas-filled strut automatically
generates lifting force which reduces the
force required by the user. If the strut
becomes damaged or develops a leak, it
must be replaced.
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