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All moving parts of the coupling must be lubricated regularly (depending on the length of use) and
checked for easy movement.
5.2 Checks
1. Clevis bearing (6):
The maximum permissible wear in the pivot is 2 mm. The coupling must be replaced if the axial play
is greater. The adjusting bolt located below the bearing is used to set the maximum torque. If there is
no movement when the locking torque (100 - 150 Nm) is exceeded, the coupling must be repaired.
This must be checked at regular intervals.
2. Coupling pin (5):
Clean the coupling pin and measure its diameter in the middle of the crowned area. Wear limits:
32 mm pin = 30 mm, 37 mm pin = 35 mm. The coupling pin must be replaced if the dimensions are
below the limits. However, the rotating coupling pin prevents excessive wear and contributes signi
ficantly to pro-longing the service life of the coupling. The wear can be checked comfortably with a
separately available Walterscheid gauge.
3. Vertical play:
Should the vertical play on the coupling pin exceed 2 mm in closed state, the coupling mechanism
must be replaced, including the coupling pin.
4. Saddle sleeve (3):
The saddle sleeve must be replaced before the saddle of the sleeve is so worn that the trailer ring rests
directly on the bottom lip of the clevis. The same applies if the hole in the saddle sleeve is so dama
ged (deformed or widened) that, when dropping, the coupling pin strikes the edge of the saddle sleeve
and no longer engages. The inside dimension of the saddle sleeve may not exceed 25.5 mm. The
opening must be clear at all times, so that any dirt can fall through.
5. Guide sleeve (4):
If, when coupling, the pin has so much play in the towing direction that it does not drop into the
saddle sleeve, its lower end instead coming to rest on the saddle sleeve, the guide sleeve is worn
and the cou-pling must be repaired. On Version B and NB couplings, the guide sleeve is provided with
a saddle. Such guide sleeves must also be replaced before the saddle is so worn that the trailer ring
rests directly on the clevis.
Use only original Walterscheid spares when replacing parts.

5.3 Safety notes

• The user is obliged to always operate the coupling in perfect condition and to forbid its use by unau
thorised persons.
• The loads indicated on the type plate may not be exceeded.
• Unauthorised conversion or modification of the coupling is not permitted.
AUTOMATIC TRAILER COUPLING
TYPE KU / IN 2000
14
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In 2000

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