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2. Interpret the wear indicator as follows:
Wear indicator
Meaning
Green zone showing ■ Coupling in new condition.
■ Towing vehicle ball hitch wear within acceptable limits.
➤ No action necessary.
Red zone showing
■ Ball hitch wear at acceptable limit, ball coupling unworn.
■ Ball hitch in new condition; ball coupling showing increased wear.
■ Both ball and coupling showing increased wear.
■ Ball coupling damaged.
➤ Have the ball coupling and ball hitch checked by a specialist workshop.
➤ Replace worn parts.
Tab. 90 Ball coupling wear indicator
Ball coupling (USA version):
To couple up the compressor, lower the open coupling onto the ball hitch of the towing vehicle so that
it clicks into place.
Fig. 87 Ball coupling (ALKO-USA)
1
Coupling handle
2
Ball coupling
3
Towing vehicle ball hitch
4
Safety pin
5
Fixing hole for the security pin
6
Ball coupling properly secured
CAUTION
There is considerable danger of injury caused by trapped fingers.
They can be trapped in the spring-loaded closing mechanism.
➤ Never place your fingers inside an open ball coupling.
➤ Always wear protective gloves.
1. Check if the security pin is removed from the coupling and draw it out if not.
2. Pull up the coupling handle.
The coupling opens.
12 Decommissioning, Storage and Transport
12.2 Transport
162
Service Manual Screw Compressor
M170 SIGMA CONTROL MOBIL
No.: 9_9425 01 E
Option sh