112
Over-run hitches
KNOTT over-run hitches are available for
both hydraulic and mechanical brakes.
Handbrake lever with power reservoir,
code „KH“
With the type “KH” the spring reservoir is
under torsion at the centre point. If the
handbrake is applied, then it works
automatically and requires almost no force.
The system is designed so that when the
handbrake is applied, sufficient energy is
stored within the spring. When transmitted
through the brake rods this prevents the
brake shoes from slipping away from the
brake drum.
16.5 Adjusting the braking system
16.5.1 Preparations
* Jack up the trailer
* Release the handbrake
* Pull out the drawbar [5] of the overrun-
system as far as it will go
Fig. 40: KNOTT overrun brake
1 Contact-breaking cable
2 Trailer coupling ring (varies by type)
3 Handbrake lever
4 Transmission lever
5 Drawbar and bellows
Danger
When any disconnection of the braking
system takes place, secure handbrake
lever by reinserting the security bolt
[15] (see warning plate [16]).
Fig. 41
15 security bolt
16Warning plate
16.5.2 Preliminary requirements:
* When carrying out adjustments, always
start with the wheel brakes.
* When carrying out adjustments, turn the
wheel only in the direction of forward
travel.
* Insert the security bolt [15] (see
warning plate)!
* Do not pre-tension the expanding
locking mechanism in the brake. If
necessary, loosen the brake linkage [6]
at the brake compensator [8].
* Check the expanding locking
mechanism and control cable [11]
for ease of movement.
Attention
* The compression spring [7] may only
be lightly pre-tensioned and must not
become fully compressed when
activated!
* Bowden cable [14] must not activate
brake.
* Never readjust the braking system or
brakes by the brake linkage [6] or
turnbuckles (if fitted) in the linkage!
16.5.3 Adjusting the brake
Fig. 42: KNOTT wheel brake
12 Adjusting screw
13 Cable entry
Tighten the adjusting screw [12] (on the
outside of the brake plate, opposite the
cable entry [13]), turning clockwise until the
wheel can only be turned with difficulty or
not at all.
Wrench sizes for adjusting screws [12]
Brake size Wrench size
160x35 / 200x50 SW 17
250x40 SW 19
300x60 SW 22
Ease off the adjusting screw [12] in the
anticlockwise direction (approx. 1/2 turn)
until the wheel turns freely. Slight rubbing
noises, which do not effect the free turning
of the wheel, are permitted.
16. Undercarriage
When the brake is correctly adjusted, the
actuating travel of the control cable [11] will
be 5-8 mm.
Carry out the adjustment procedure,
as described, on all the wheel brakes in
succession.
16.5.4 Adjusting the brake
compensating system
Fig. 43 KNOTT transmission system for
tandem and single-axle chassis.
6 Brake linkage
7 Compression spring
8 Compensating balance assembly
9 Compensating balance (tandem) or
master compensator
10 Compensating balance (single axle)
11 Control cable
Fig. 44 KNOTT transmission system for
tandem and single-axle chassis.
14 Bowden cable for handbrake
* Insert the security bolt [15] (see
warning plate)!
* Remove the bowden cable [14].
* Preadjust the length of the brake linkage
[6] (slight play permitted).
* Insert the bowden cable [14].
15
14
16
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