Hyundai Excavator R450LC-7. Service and repair manual - page 19

6-17

MACHINE MAKES A CURVED TRAVEL OR DOES NOT TRAVEL AT ALL WHEN TRAVEL
AND ATTACHMENT OPERATIONS ARE EXECUTED AT THE SAME TIME

7)

6-22

BOOM MAKES A SQUEAKING NOISE WHEN BOOM IS OPERATED

6)

6-23

A

※

HOW TO CHECK INTERNAL BOOM CYLINDER LEAKAGE

Raise bucket OFF the ground by retracting
the arm cylinder rod.
If oil leaks from piping side and boom
cylinder rod is retracted there is an internal
leak in the cylinder.
If no oil leaks from piping side and boom
cylinder rod is retracted, there is an internal
leak in the control valve.

3.

Disconnect hoses(A) from rod side of boom
cylinder and drain oil from cylinders and
hose.(Put cups on piping and hose ends)

2.

Lower the bucket teeth to the ground with
bucket cylinder fully retracted and arm
cylinder rod retracted almost in full.

1.

29076TS01

6-20(2) 210-7

29076TS01

4. 

 WHEN COOLANT OVERHEAT WARNING LAMP LIGHTS UP(Engine is started)

·

Before disconnecting the connector, always turn the starting switch OFF.

·

Before carrying out below procedure, check all the related connectors are properly inserted.

·

After checking, insert the disconnected connectors again immediately unless otherwise specified.