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Maintenance and operating instructions ZAF-2
Setting the brake linkage
Make sure the wheel brake is correctly set in
accordance with the relevant BPW installation
instructions.
Set the handbrake lever (1) to the released
position.
Pull the pull rod (2) of the overrun hitch out
forwards as far as the stop.
Install the brake cables.
Use the thread lengths of the linkage and the
brake cables to even extents. The equaliser
must be aligned at right angles to the brake
linkage.
Tighten the setting nut (3) (according to
version) or turnbuckle (4) until the cable
strands are tensioned.
Tighten the handbrake lever manually several
times to 200 N to 300 N and return to the
released position (2).
Operate the setting nut (3) (according to
version) or turnbuckle (4) until the cable
strands are slightly tensioned.
Important: The wheel brakes are not
allowed to be pre expanded.
When doing this, ensure that when the trailer
is removed from supports, the transmission
linkage is set without play or force on the
clamp lock or the counterweight.
Tighten all locknuts on the transmission device
and recheck that they are firmly seated.
Tightening torques for locknuts
Thread Tightening torque M ±10 % (Nm)
M 8
M = 12 Nm
M 10
M = 24 Nm
M 12
M = 40 Nm
Important:
Hold the brake linkage in position when
tightening the locknuts!
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Operating Instructions
BPW Overrun brake systems
The BPW overrun brake system consists of a BPW towing hitch, wheel brakes and
transmission devices.
The BPW wheel brake " 7" permits easy changing from forward to reverse travel. After
each change the system is again immediately ready for operation.
Overrun devices
BPW towing hitches are mechanical devices with a gas pressure supported hydraulic
shock absorber. The drawbar force (thrust force) generated by the braking of the towing
vehicle results in the insertion of the pull rod after the response threshold has been over
come. The thrust force is converted by the reversing lever into tensile force which
activates the wheel brakes through the transmission device.
BPW connecting assemblies in series ZAF 2 are equipped with a over centre handbrake
lever with a spring type actuator as parking brake system.
In these versions, the handbrake lever must be pulled tight with a 400 – 600 N operating
force as far past the TDC position as possible.
The spring forces provide adequate braking even when the actuation travel is increased
by the automatic reversing operation. It must be noted that, with the parking brake
activated, the vehicle can roll back about 30 cm until the braking force takes full effect.
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