2 minute read
Control and operation
Recovering, towing the machine hydraulic brake valves must be deactivated. As necessary, consult your LIEBHERR customer service.
Note!
As a general rule, the easiest way to release the travel brakes is to use the hoses 6 for applying the external pressure and to loosen the hydraulic brakes valves 7 and to slightly disjoin them from the hydraulic motors 8
Sufficiently lift up the working attachment of the machine so that the grab tool will not lay on the ground during towing.
If the Diesel engine cannot be started or if the hydraulic system is defective, the working attachment can be raised using an external pressure source, see also the heading "Emergency supply of the boom cylinders", previously in this chapter. As necessary, take advice in your LIEBHERR customer service.
Return if necessary the excavator in its previous state after completion of the towing procedure.
3.7Installation and removal of attachment parts
3.7.1Removal and installation of a
The following is a description of how to attach and dismount buckets. Buckets are, for example, hoe type buckets, ditcher buckets or breaker teeth.
To remove a bucket
Position the attachment in such a way that the entire lower part of the bucket is laying on the ground.
Unscrew locking plate 5 and locking plate 6
Installation and removal of attachment parts
Knock out pin 3 and pin 4 and remove the complete pin bearing sealing 25.
If necessary, raise the equipment slightly when knocking out pin 4 to relieve it.
To reinstall a new bucket
Position the bucket to be attached in such a way that its entire lower part is laying on the ground.
Start the engine and move the equipment until the stick mount and the bearing points A of the bucket are squared.
Engage the pin 4 in its bore and push it in the complete pin bearing sealings 25 between bucket and stick while pressing in the pin. Observe the correct installation direction of the complete pin bearing sealings 25 .
Make the O-rings 25.1 slide to the interior
Secure the pin 4 with the locking plate 6
Extend the shovel cylinder slowly until the bore hole in connecting clip 7 is located precisely between the bearing points B
Engage the pin 3 in its bore and push it in the complete pin bearing sealings 25 between bucket and stick while pressing in the pin. Observe the correct installation direction of the complete pin bearing sealings 25
Make the O-rings 25.1 slide to the interior .
Secure the pin 3 with the locking plate 5.
Lubricate all greasing points of pins 3 and 4 directly or with the automatic grease system (if mounted) until clean grease comes out of the greasing points.
Note!
After installation of a new digging bucket, the restrictor check valves 222 and 232 for stick, respectively bucket tilt cylinders must be eventually readjusted so to have the correct velocity of the working attachment (due to weight differences of the digging bucket).If necessary, consult a LIEBHERR mechanic.
In particular on machines, which are delivered without digging bucket or grapple, this restrictor check valves must be (if mounted) adjusted after installation of the digging tool, so to avoid uneven or jerky movements of the attachment parts.
