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07-25

BOOMRETRACTING

a) Makesuretheseatoccupiedandactivatethepedaltoretracttheboom;

b) Tiltthepedalbackwardtoretracttheboom.IftelescopingcylinderIIisactivated,telescopic

sections2,3and4retract.WhencylinderIIisfullyretracted,LMIwillalarm.Pushbuttonon

LMItochangetocylinderI.Thetelescopicsection1willthenretract;

c) Aftertheboomretractstorequiredposition,slowlytiltthepedalforwardtoneutral

position.

Fig.07-21

Caution

(1)Thehookwillberaisedorloweredduringtheprocessofboomextendingand

retracting.Therefore,movetherelevantjoysticktopayoutortakeinthehoist

ropetoregulatethehookheight.Theoperationmustbeslowlyandstably;

(2)Thespeedofcranemovement “Boomextending/retracting” canbecontrolled

byTHROTTLEPEDAL.Tiltthepedalallthewayforwardforhighspeedextend

orretract.Donotchangethespeedjerkilytoensurestablemovements;

(3)Waitfor2secondstoextendtheboomafterboomfullyretracted;

(4)Lifttheloadverticallyanditisforbiddentolifttheloaddiagonally.Donot

laterallydragtheloadwhichisstillontheground;

(5)Itisforbiddentousethebypasskeyswitchexceptundercommissioningand

maintenance;

(6)Theboomwillberetractedalittleautomaticallyaftertheboomisextendedfora

periodoftime;

Cause:

- Variationofhydraulicoiltemperature;

- Boomextension/retractionstatus,boomangle;

- Lubricatingstatus.

Solutions:

- Keepthehydraulicoiltemperaturenottorisetoohigh;

- Extendtheboomtothedesiredlength.

(7)Donotextend/retracttheboomwithload.

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