Removal and Installation of Boom HBCV

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. ・ Be sure to release hydraulic pressure before beginning work.

Items to prepare •Wrenches (19 mm, 22 mm) •Hexagon wrench (10 mm) •Marking pen •Cap •Plug •Rag •Cleaning fluid •Crosstie 1.Removal of boom HBCV [1] Use wrenches (19 mm, 22 mm) to remove the HBCV (1), (2), and (3) hoses. •Mark the HBCV and hoses so that the connectors match at the time of assembly. •Use caps or plugs to cover the HBCV and lines to prevent any entry of water, dust or dirt. •Clean the HBCV and lines by spraying them with a parts cleaner to prevent scratches and prevent dirt from accumulating on the connectors. [2] On the cab side, use a wrench to remove the boom bottom pressure sensor (4).

[3] Use a hexagon wrench (10 mm) to remove the 4 bolts (5), and then remove the line (6). •Use caps or plugs to cover the HBCV and lines to prevent any entry of water, dust or dirt. •Clean the HBCV and lines by spraying them with a parts cleaner to prevent scratches and prevent dirt from accumulating on the connectors.

[4] Use a hexagon wrench (10 mm) to remove the 4 bolts (7), and then remove the boom HBCV (8).

[5] Use the same procedure to remove the opposite side.

2.Installation of boom HBCV

To install, perform the reverse of the removal procedure.

The tightening torque for line installation and HBCV installation is 98.1 ± 20 N•m.