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Checking track tension
• The track must not slacken by more than 10-15
mm. Operate the outriggers up and then down.
Wait 15 minutes and then check.
• If the tracks become slack it can be due to one of
the track tensioning function’s non-return valves
being blocked or broken.
Cleaning non-return valves
The non-return valves can be cleaned by discharging
the pressure in the accumulator and thus loosening
the tension of the tracks.
• Pull out the valve and rotate it a quarter turn to lock
it in open position.
• Operate the outriggers up and down. Hydraulic
fl uid is then pumped around and cleans the non-
return valve.
• Rotate and release the valve back into position.
Operate the outriggers up and down to tension the
track.
Hammer lubrication
Check that grease is reaching the hammer by dis-
mantling the grease hose at the hammer. Start the
machine and activate the hammer function. Exercise
great caution during the inspection to ensure that
nobody is injured.
Tools
Check that the tool can be used in such a way that
neither the operator nor people in the vicinity are
exposed to unnecessary risks. Refer to the supplier’s
Operator’s Manual for other checks.
Functional inspection
General
Functional inspections must ensure that the machine’s
functions are intact.
Brake functions
• Check the drive brake’s function by operating the
machine on a slope. Release the joysticks. The ma-
chine should then be braked and remain stationary.
• Check the slew brake’s function by rotating the arm
on a slope. Release the joysticks. The arm should
then be braked and stop gently.
Cooler
Overheating has a negative effect on the service life
of the machine’s components. Clean the cooler when
necessary. Refer to “Cleaning the machine” in the
“Maintenance and service” section.
Cylinders
Checking cylinder tubes and piston rods must be
done with the cylinders extended to the end position.
Replace damaged components immediately.
• Check that the cylinder tubes are not dented or
cracked.
• Check that the piston rods are undamaged and
straight. A damaged piston rod causes contamina-
tion in the hydraulic system, resulting in mechani-
cal damage.
Tool attachment
Warning!
The tool attachment’s cotter and pin are impor-
tant safety components. A worn or damaged
cotter must be replaced with an original spare
part, manufacturing your own cotters is not
permitted.
• Check that the tool attachment is complete and
that all parts are intact and correctly mounted.
Automatic track tensioning
The caterpillar tracks are tensioned automatically
when the outriggers are up.
Should demolition material or suchlike enter into the
side of the tracks during operation, their spring func-
tion should prevent breakdowns and stoppages. The
spring function consists of a hydraulic accumulator.
MAINTENANCE AND SERVICE
44 - English