Control and operation

Installation and removal of attachment parts

Before attaching a clamshell bucket or grapple, ensure that the required hydraulic lines for operating the grab are built into the stick.

Attaching and dismounting a grab should be carried out by two people.

Danger!

Risk of injury.

Ensure that the machine’s operator follows the signaller’s hand signals when moving the attachment.

Attaching the grab

If necessary, dismount the bucket.

Retract the bucket cylinder as far as the stop.

Fix the connecting link 7 to the right reversing lever 9 with carrier bracket 8

Secure with cotter pin 10.

Position the grapple with the shells fully opened.

Move the equipment until the lower mount of the stick is between the bearing points of the grab mounting 1

Guide in the pin 4 in its bore and push in the pin bearing sealings 25 complete with protection ring while pressing in the pin.

Secure the pin 4 with plate 6

Connect the hydraulic hoses 11 and 12 for the shell cylinder to the hydraulic lines of the bucket cylinder circuit.

For grapple with hydraulic rotator, hoses 13 and 14 must be connected to the hydraulic lines for added functions on the stick.

Operating the grab

Two hydraulic lines on the shovel arm are set in for operating either the tilting cylinder or the grab.

The lines are reversible via two valve blocks 15:

– A - Tilting cylinder operation (for buckets)

– B - grab operation (for grab, scrap cutter etc.)

Turn the lever of the valve blocks 15 in position B (Position B, Grab operation).

Note!

If the machine is equipped with a hydraulic quick-change adapter and LIKUFIX, there is no need to switch between tilt cylinder operation and grab operation. There is no valve block 15

Lubricate all greasing points of the pin 4 and of the grab directly or with the automatic grease system (if mounted) until clean grease comes out of the greasing points.

Carry out all work movements several times without a load (open and close the shell or move the grab to the left and to the right) so that any air that may be present in the hydraulic circuits can escape.

Dismounting the grab

Set the grab down onto level ground with the shells fully opened.

Turn off the engine and, with the ignition key in the contact position, push the right joystick briefly to the left and then to the right in order to remove the pressure in the hydraulic circuits.

To relieve the grab’s torsional mechanism, press the two push buttons in the left (or left and right – optional extras) joystick for “Turn grab”.

Turn the lever of each valve block 15 in position A (Position A, bucket operation) and push the right joystick briefly to the left and then to the right in order to remove the pressure in the hydraulic circuits.

Push the safety lever up.

Separate hydraulic hose 11, hydraulic hose 12 and, if present, hydraulic hoses 13 and 14 from the pipes on the stick.

Close open lines immediately to prevent any dirt entering.

Support the grab so that it is stable.

Remove the plate 6. Drive out the pin 4 and remove the pin bearing sealings 25 If necessary, start the engine and lift the attachment slightly to remove the pin 4

3.7.4Attaching and dismounting the grab on the industrial stanchion

Before attaching a clamshell bucket or grapple, ensure that the required hydraulic lines for operating the grab are attached to the industrial stanchion.

Attaching and dismounting a grab should be carried out by two people.

Danger!

Risk of injury.

Ensure that the machine’s operator follows the signaller’s hand signals when moving the equipment.

Attaching the grab

Position the grab with the shell fully open.

Move the equipment until the lower mount of the industrial stanchion is between the bearing points of the grab mounting 1

Guide in bolt 4 and secure using disk 6.

Connect hydraulic hose 11 and hydraulic hose 12 for the shell cylinder supply to the pipes for the shovel tilting cylinder.

For a grab with a hydraulic torsional mechanism, also connect hoses 13 and 14 to the pipes for this auxiliary device.

Operating the grab

Carry out all work movements several times without a load (open and close the shell or move the grab to the left and to the right) so that any air that may be present in the hydraulic circuits can escape.

Dismounting the grab

Set the grab down onto level ground with the shell fully opened.

Turn off the engine and, with the ignition key in the contact position, push the right joystick (for Open and Close grab)briefly to the left and then to the right in order to remove the pressure in the hydraulic circuits.

To relieve the grab’s torsional mechanism, press the two pushbuttons in the left (or left and right – optional extras) joystick for “Turn grab”.

Separate hydraulic hose 11, hydraulic hose 12 and, if present, hydraulic hoses 13 and 14 from the pipes on the shovel arm.

Close open lines immediately to prevent any dirt entering.

Support the grab so that it is stable.

Unscrew disk 6 and knock bolt 4 carefully out. You may have to start the engine and raise the equipment slightly to do this.

3.7.5Attaching and dismounting the stick to the boom

Dismounting the stick

If necessary, remove the bucket.

Retract the bucket and stick cylinder as far as the stop, position the attachment on the ground.

If necessary, tie the connector bracket 7 to the bucket cylinder so it can not slip out.

Turn the engine off.

Release the pressure in bucket and stick cylinder circuit by turning the ignition key to contact position, tilting the safety lever down, and moving the right joystick to the left and right, the left joystick forward and backward.

Release the pressure in the hydraulic tank.

Attach the lower part of the stick cylinder 16 to the lift with a strap.

Position a wooden block under the stick cylinder, remove the plate of pin 17, lightly lift the the cylinder, drive out the pin 17and position the stick cylinder 16 on wooden blocks.

Figure B

Insert the pin 17 in the rear bearing of the stick and secure it with the plate, then attach the pin 17 to the lifting device with a strap.

Attach the head of the bucket cylinder 18 (or to the hook of the bucket, if the stick is removed with the bucket in place), to the lift with a strap.

Disconnect both hoses 21 from the tilt cylinder 18 and close them off to prevent contamination.

Remove the cotter pin and the castle nut on pin 20 and drive the pin out. If necessary, start the engine and slightly lift the attachment to reduce the weight of the boom on pin 20.

Raise the stick (or the stick with the bucket) with a lift, pull the stick from the boom and position it on the ground, supported by wooden blocks and remove the lift.

Attaching the stick (or stick with bucket)

Figure B

Insert the pin 17 in the rear bearing of the stick and secure it with the plate, then attach the pin 17 to the lifting device with a strap.

Attach the top of the bucket cylinder 18 (or the hook of the bucket, if the stick is removed with the bucket in place), to the lifting device with a strap.

Raise the stick (or the stick with the bucket) with a lift inside the bore holes of the boom so that the pin 20 can be inserted.

Insert pin 20 and fix the castle nut and the cotter pin to the pin 20

Remove the pin 17

Reconnect both hoses 21 to the tilt cylinder 18.

Figure A

Attach the lower part of the stick cylinder 16 to the lift. Slightly lift the stick cylinder and if necessary run engine to extend or retract cylinder so that cylinder head fits between the bore holes of the stick.

Insert the pin 17 and secure it with the plate. If necessary, install the bucket.

Lubricate all greasing points between stick and boom and between bucket and stick directly or with the automatic grease system (if mounted) until clean grease comes out of the greasing points.

Lift the attachment and tilt the bucket out and in several times to release the air from the hydraulic system.

Note!

After installation of a new stick and digging bucket combination, the restrictor check valve 222 for stick cylinder must be eventually readjusted so to have the correct velocity of the working attachment (due to weight difference of the attachment parts).

If necessary, consult a LIEBHERR mechanic.

3.7.6Mechanical quick-change adapter (option)

Safety instructions

–Ensure that nobody is located in the working area of the equipment when attaching and dismounting work tools. Move the work equipment as slowly as possible when attaching and dismounting a work tool. Get to know the mode of operation of the quick-change adapter before attaching or dismounting work tools.

–Always keep the work tool as close to the ground as possible when locking and unlocking to avoid creating conditions which may lead to danger.

–If necessary, use a platform to reach the locking pins and connections. Never stand on the work tool.

–Each time a work tool is changed, the machine’s operator must ensure that the locking pin for the quick-change adapter inserts in the bore holes on the work tool which are designed for the purpose and that the work tool raises correctly. A direct visual check must be made to ensure that the work tool is correctly positioned.

–A working cycle should also be carried out with the work tool, where the work tool is only raised to the point where the correct position of, for example, the pin in the pin eye can be tested by tilting in and out.

–The correct positioning of the locking screw must be checked daily.

–The load carrying capacity of the quick-change adapter or the integrated lifting hook can exceed or fall short of the load carrying capacity of the carrier device. When operating, it should be ensured that the values provided in the load chart and the technical data for the carrier device are adhered to.

Overview

1 Locking pin (removed) 3 Crank 5 Lifting hook

Attaching the work tool

To move the equipment into position:

Positioning the equipment

The equipment must be standing stable or lay loose on the ground. Move the stanchion and work tool into position. Insert the shovel tilting cylinder fully.

To unlock the quick-change adapter:

2 Locking screw 4 Sealing plug 6 Take-up hook for work tool Danger! Risk of injury.

Ensure that the work equipment cannot be moved by others when this action is being carried out.

Approach the quick-change adapter from the side and unscrew the locking screw 2 using the crank 3 from the locking pin 1 (see Fig. 3-104).

Insert the crank 3 in the locking pin 1 and turn to the left (anti-clockwise), until both locking pins 1 are inserted as far at the stop.

Taking up the work tool:

Taking up the work tool

Move the quick-change adapter into a position that allows the work tool to be picked up using the take-up hook.

Raise the work tool from the ground and extend the shovel tilting cylinder fully until the bearing panel for the work tool is laying on the quick-change adapter stop. The bore holes of the work tool and the locking pins of the quick-change adapter must form a row.