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+
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WD-40
EN
This installation and operation instruction apply to non standard automatic drawbar coupling
50mm RINGFEDER type 5055 in models A, B, AW, AP, AM.
Type 5055 is approved to connect with drawbar eyes 50 according to DIN 74053, ISO 1102
or D50 in accordance with 94/20 EC or ECE 55 R-01 and 50mm heavy duty drawbar eyes
(Ringfeder order no. 6991394 or equal).
These automatic drawbar couplings are to be used exclusively to connect with vehicles,
trucks and trailers equipped with the appropriate drawbar eyes.
When fitting (or replacing) the trailer couplings, always attend to the relevant statutory
regulations and particular information from the vehicle manufacturers. When replacing
the trailer couplings all component parts of the trailer couplings comprised in the delivery
have to be exchanged. Fitting of the trailer couplings on the vehicle has to be made in
compliance with the requirements laid down in appendix VII of the directive 94/20 EC and
ECE 55 R-01, respectively. Installation and maintenance works have to be carried out care-
fully and professionally.
When it comes to the four fastening screws and nuts, always attend to the screws and
nuts qualities given by the vehicle manufacturers that may possibly deviate from the present
specifications.
MaintenanceInstallation Operation
Functional
inspection
Acoustic inspection –
make sure that no air is
escaping!
Uncoupling procedure Coupling procedure
Page 28-29
Tables (please
refer to p. 30)
Coupling (50 mm) Lochbild (e1 x e2)
Screw Washer Nut
Type Approval
Castellated nut
Wrench size
Tightening torque
Page 30 - 89
Coupling open Coupling
closed
and secured
Attention: Risk of
injury – jammed
fingers.
Lubricant
WD-40
Interval:
once per month
Wiring diagram for assembly
of LED and control unit.
Cable optional Cable from
Customer
V
-
+
Attention!
Follow
instructions!
Spanner
required
Do not connect
to the braking
system!
Wiring diagram
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