After‐sales service ~ Radio-controlled devices ~

■Trouble with radio control

(1)The receiver will not light up

Possible causes Troubleshooting
Power switch is not ON Turn ON internal and external power.
Bad battery connection Reconnect.
Battery not charging Replace with another battery.
Internal trouble Return to the manufacturer for repair.


(2)The transmitter will not light up

Possible causes Troubleshooting
Power not turned on Turn ON the power.
Batteries inserted incorrectly Insert correctly.
Battery not charging Replace.
Internal trouble Return to the manufacturer for repair.


(3)The receiver relay is not working

Possible causes Troubleshooting
Radio frequency interference (short term) Wait a moment, then operate.
Insufficient extension of antenna Extend the antenna to a sufficient length.
Poor antenna extension connection Reconnect.
Internal problem with transmitter/receiver Return to the manufacturer for repair.


(4)The electromagnetic valve is not working

Possible causes Troubleshooting
Poor connection between receiver and valve Reconnect.
Electromagnetic coil is burned out, problem with internal valve Return to the manufacturer for repair.


■Bucket will not close

(1)The open/close claws will not catch

Possible causes Troubleshooting
Claw receiver will not rotate Remove the claw adjustment bolt.
Claw receiver and shaft are stuck together Remove the shaft and adjust it.


(2)The claws will not become perpendicular

Possible causes Troubleshooting
Claw adjustment bolt is not removed Remove the claw adjustment bolt.
Spring damage inside cylinder Return to the manufacturer for repair.


(3)The claws loosen after catching

Possible causes Troubleshooting
Air in oil Bleed air.
Insufficient oil Add oil.
Broken electromagnetic valve Return to the manufacturer for repair.
Broken check valve Replace.


■Bucket will not open

(1)Sometimes will not open

Possible causes Troubleshooting
Radio frequency interference Wait a moment, then operate.
Button not held down for long enough Press for at least two seconds.
Poor antenna sensitivity Extend the antenna to a sufficient length.
Incorrectly positioned antenna Move to a location without interference.


(2)Will not open from the start

Possible causes Troubleshooting
Failure to Turn ON the power. Turn ON the power.
Insufficient charging of battery Replace the battery.
Too much oil Reduce to an appropriate amount.
Other [1] items Check other [1] itemsv


(3)Stops opening midway

Possible causes Troubleshooting
Batteries Replace the batteries.
Unplugged Plug in.
Internal circuit in receiver disconnected Check circuit connections.
Broken transmitter/receiver, broken electromagnetic valve Return to the manufacturer for repair.


(4)The claws move a little but will not open

Possible causes Troubleshooting
Button not held down for long enough Press for two seconds.
Claw and claw receiver are stuck together olish the contact surface.
Claw and claw shaft are stuck together Take apart and polish, or replace


■Bucket opens midway

(1)Sometimes occurs

Possible causes Troubleshooting
Air in oil Add oil.
Insufficient oil Add oil.
Oil contamination Change the oil.


(2)Trouble closing after opening midway

Possible causes Troubleshooting
Cylinder oil leak Replace the packing.
Hydraulic hose disconnected Reconnect.