Removal and Installation of Center Joint

Caution ・ Be sure to stop the engine before beginning work. ・ Be sure to inspect the wire rope and other lifting equipment before beginning work. ・ Do not stand or pass under the suspended load.

Items to prepare •Wrenches (17 mm, 19 mm, 27 mm, 36 mm) •Hexagon wrench (5 mm) •Box wrench (19 mm) •Specialty adapter for vacuum pump connection •Vacuum pump (vacuum pump power supply) •Extension cable •Marking pen •Caps •Plugs •Wire rope (with the required breaking load) •Crane (with the required lifting capacity) •Wood planks, etc. •Rag •Cleaning fluid 1.Removal of Center Joint [1] Use a hexagon wrench (5 mm) to remove the 4 bolts (1), and then remove the air breather (2) on the hydraulic oil tank.

[2] Attach the specialty adapter (3) to the area where the air breather was removed, and set the vacuum pump (4).

Create negative pressure in the hydraulic oil tank using the vacuum pump.

1 Bolt 2 Air breather 3 Specialty adapter 4 Vacuum pump

[3] Use a box wrench (19 mm) to remove the 8 bolts (5), and then remove the lower under covers (6).

[4] Prepare a waste oil can (7) to receive the oil that spills out under the center joint.

[5] Use a wrench (36 mm) to remove the travel hoses (8) and another wrench (27 mm) to remove the drain hoses (9). •Mark the center joint and hoses so that the connectors match at the time of assembly. •Attach caps or plugs to the center joint and hoses to prevent any entry of water, dust or dirt. •Clean the center joint and hoses by spraying them with a parts cleaner to prevent scratches and prevent dirt from accumulating on the connectors.

5 Bolt 6 Lower under cover 7 Waste oil can 8 Travel hose 9 Drain hose

[6] Use a wrench (19 mm) to remove the pilot hoses (10) and another wrench (27 mm) to remove the drain hose (11). •Attach caps or plugs to the center joint and hoses to prevent any entry of water, dust or dirt. •Clean the center joint and hoses by spraying them with a parts cleaner to prevent scratches and prevent dirt from accumulating on the connectors.

[7] Use a wrench (19 mm) to remove the 2 bolts (12), and then remove the center joint lock bar (13).

[8] Use a wrench (36 mm) to remove the 4 travel hoses (14). •Mark the hoses so that the connectors can be matched during assembly. •Attach caps or plugs to the hoses to prevent any entry of water, dust or dirt. •Clean the hoses by spraying them with a parts cleaner to prevent scratches and prevent dirt from accumulating on the connectors.

10 Pilot hose 11 Drain hose 12 Bolt 13 Lock bar 14 Travel hose

[9] Wrap a wire rope (15) around the center joint and suspend it with a crane so that the center joint does not fall during removal and installation operations.

[10]Use a wrench (17 mm) to remove the 4 bolts (16) from the center joint.

[11]Use the wire rope (15) and crane to lift the center joint (17). [12]Thoroughly check that the location is safe before lowering the center joint on wood planks.

15 Wire rope 16 Bolt 17 Center joint

2.Installation of Center Joint [1] Perform the reverse of the removal procedure. The tightening torque for the center joint bolts (1) is 109 - 127 N•m. [2] The tightening torque for the lock bar (2) bolt (3) is 88.3 - 107 N•m. Also, apply Loctite #262 to the bolts.

1 Bolt 2 Lock bar 3 Bolt