BA 35101/02/ 03 EN – Edition 1.0 * 35101_02_03b510.fm 5-37
Maintenance
5.18 Maintenance of the automatic trailer coupling (option)
Cleaning and lubricating the trailer coupling
Make sure 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 clean-
ing is over
☞ Apply tough water-proof grease (EP3) to the coupling pin, the base ring and the draw-
bar 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
Worn coupling pins, too much play in the bearing or a worn base ring carries a
danger of accidents!
☞ Check the trailer coupling once a day for wear and play
☞ Apply grease to the base ring
☞ Have a defective 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 driving 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 be carried out by an authorised
workshop only!
Fig. 192: 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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