OM 28Z3 US – Edition 2.0 * 28Z3b340.fm 3-61
Operation
Operation
Picking up an attachment
Caution!
Personal injury or equipment damage hazards. An improperly connected
attachment can detach or fall unexpectedly.
• Before connecting an attachment, clear all personnel from the work
area.
• Make sure the attachment is mounted correctly and fully functional
before operating. Test the functionality with a short and rapid succession
of stick and bucket movements as close as possible to the ground.
• Never operate an attachment with a malfunctioning lock.
Important!
For system-specific reasons, the hydraulic quickhitch opens and closes with the
functions “Stabilizer blade”, “Auxiliary hydraulics”, “Boom swivel”, “3rd control cir-
cuit (option)” and “Rotate upper carriage”.
While connecting attachments, only use the function “Raise stabilizer blade”
to open or close!
Caution!
The optical check pin K must be fully retracted.
If it can still be seen, or if you are unsure whether the bucket is mounted on the
machine without any play:
• Troubleshoot and rectify immediately!
Proceed as follows:
☞ Engage claws A (on the side of the excavator) into pins Z of the bucket mount.
☞ Move the attachment inwards with a turning movement by actuating the bucket hydrau-
lic cylinder, so that the second pin D of the attachment also makes contact with quickh-
itch.
☞ Actuate switch B.
➥ The buzzer sounds.
➥ The hydraulic quickhitch is enabled and can be operated.
☞ Press and hold the foot-operated tip switch C.
☞ Operate the stabilizer blade (raise as far as it will go).
➥ The quickhitch opens.
➥ Check pin K (red) indicates that the quickhitch is fully open.
➥ The second pin D of the bucket falls into the quickhitch claw.
☞ Check whether the bucket touches the quickhitch with the second pin D.
☞ Release the foot-operated tip switch C.
☞ Operate the stabilizer blade (raise as far as it will go).
➥ The quickhitch closes.
☞ Disengage switch B.
➥ The buzzer is mute.
➥ The hydraulic quickhitch is disabled.
☞ Check the bucket and make sure it is firmly installed!
Fig. 81: Quickhitch system
Z
K
D
A
C
B
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