Removal and Installation of Arm Cylinder

Caution ・ Stop the machine on a level location with good footing. ・ Be sure to stop the engine before beginning work. ・ When working together with others, always be sure to exchange signals and pay adequate attention to safety. ・ Always wear protective devices (protective eyewear and safety shoes, etc.) when working with a hammer. ・ Be sure to inspect the nylon sling and other lifting equipment before beginning work. ・ Do not stand or pass under the suspended load.

Items to prepare •Wrenches (17 mm, 30 mm) •Hexagon wrench (14 mm) •Nylon sling (with the required lifting capacity) •Liftcrane (with the required lifting capacity) •Cap •Plug •Hammer •Striking rod •Grease •Rag •Cleaning fluid •Crosstie •Wire 1.Removal of arm cylinder [1] Use a liftcrane and nylon sling (1) to secure the arm cylinder (2).

[2] Use a wrench (30 mm) to remove the bolt (3) and spacer (4).

[3] Use a hammer (5) and striking rod (6) to remove the pin (7). Be careful. The arm and arm cylinder rod may come out of place at this time.

[4] Start the engine, move the arm out at idle, and retract the arm cylinder (2) rod.

[5] Tie the cylinder rod with wire (8) so that it cannot come out.

[6] Switch the key switch (9) OFF to stop the engine. Switch the key switch ON again, and then turn the control lever (10) about 10 times to bleed off any pressure.

Do not operate the arm at this time.

[7] Move the travel lever (11) back and forth about 5 times to bleed off the pressure. [8] Switch the key switch OFF.

[9] Press the air breather button (12) on top of the hydraulic oil tank to release the pressure inside the tank.

[10]Use a hexagon wrench (14 mm) to remove the flange bolts, and then remove the hoses (13) and (14). •Use caps or plugs to cover the hoses and lines to prevent any entry of water, dust or dirt. •Clean the hoses and lines by spraying them with a parts cleaner to prevent scratches and prevent dirt from accumulating on the connectors.

[11]Use a wrench (17 mm) to remove the grease hose (15). •Use caps or plugs to prevent any entry of water, dust or dirt.

[12]Use a wrench (30 mm) to remove the bolt (16) and spacer (17).

[13]Use a hammer (18) and striking rod (19) to push the pin (20) out. •If a pin is hard to remove, there is a load on the pin. •When removing the pin, be careful not to damage the installed O-rings or dust seals.

[14]Lift the arm cylinder (2). [15]Place the arm cylinder (2) on the crosstie.

2.Installation of arm cylinder

To install, perform the reverse of the removal procedure. •Clean each pin and pin hole. •When inserting pins, be careful not to damage the O-rings or dust seals. •As the final step, always grease up.