BA 348-01 * 2.0 * 34801b510.fm 5-35
Maintenance 5
5.17 Maintenance of the automatic trailer coupling (option)
Cleaning and lubricating the trailer coupling
Ensure that the coupling pin is engaged in the trailer coupling before cleaning
with high-pressure equipment!
☞Apply a little more grease to the coupling pin and the base ring once cleaning
is over
• Apply tough water-proof grease (EP3) to the coupling pin, the base ring and the
drawbar eye after heavy use and before putting the coupling into operation
• Apply tough waterproof grease (EP3) to the lower bearing of the coupling jaw
• Apply grease to the grease nipple on the joint
Check the trailer coupling for wear
Risk of accidents in case of a worn coupling pin, too much play in
the bearing or a worn base ring!
☞Check the trailer coupling once a day for wear and play
☞Apply grease to the base ring
☞Have a malfunctioning trailer coupling replaced by a new one
☞Checking the bearing and longitudinal play A of the coupling head
• Move the uncoupled coupling head with force in travel direction
☞Checking the height-wise play of the coupling head
• Open the coupling
• Move the coupling head up and down with a suitable tool (mounting lever)
➥ Play A in the centre axis of the coupling head = max. 3 mm
☞Checking the coupling pin C/D
• Measure wear by means of a slide gauge on the thickest section of the coupling pin C
➥ Diameter C may not drop below 36.5 mm
➥ Height-wise play B max. 2.5 mm
• Check pin play D in the base ring and thickness E of the base ring
➥ Pin play D max. 2.5 mm
➥ Thickness E of base ring min. 7 mm
Repair work on the trailer coupling must only be performed by an authorized
service centre!
Fig. 191 : Rockinger trailer coupling
A
36.5 mm
B
C
D
E
2.5 mm
7 mm
2.5 mm
36.5 mm
3.0 mm
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