5 Work Operation
TC29
46
5.3.3 --
5.3.4 Clamshell grab
Changing procedure without quick-attach
system
(clamshell grab directly attached)
Before the clamshell grab is mounted,
the bucket cylinder piston rod must be
fully retracted and the ball valves (29/3)
closed.
• Attach the grab to the dipper stick and secure it
using the suspension bolt.
• Connect the swivel motor to the couplings (29/1 -
additional control circuit) and the "Open/Close"
function to the couplings (29/2 - bucket
cylinder).
When the grab has been dismantled, re-
open the ball valves (29/3).
Procedure for changing attachments with
quick-attach system
• Attach the clamshell grab and close the quick-
attach system until the locking pins are
completely extended.
• Retract the bucket cylinder piston rod
completely and close the ball valves (29/3).
When assembling and using a clamshell
grab with a quick-attach system, the
bucket cylinder piston rod must be fully
retracted.
• Connect the swivel motor to the couplings
(29/1 - additional control circuit) and the
"Open/Close" function to the couplings (29/2 -
bucket cylinder).
When the grab has been dismantled,
re-open the ball valves (29/3).
Fig. 29 Additional control circuit
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