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, 27 mm) •Hexagon wrench (8 mm) •Marking pen •Caps •Plugs •Rag •Cleaning fluid •Crossties 1.Removal of Boom HBCV [1] Use wrenches (19 mm, 22 mm) to remove the hoses (1), (2), (3) and (4) from the tool box side boom HBCV. •Mark the HBCV and hoses so that the connectors match at the time of assembly. •Use caps and 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] Use a hexagon wrench (8 mm) to remove the 4 hexagon socket head bolts (5), and then remove the line (6). •Use caps and plugs to cover the HBCV and line 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.

1 Pilot hose (use 19 mm wrench) 2 Drain hose (use 22 mm wrench) 3 Drain hose (use 22 mm wrench) 4 Pilot hose (use 22 mm wrench) 5 Bolt 6 Line

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

[4] Use wrenches (19 mm, 22 mm) to remove the hoses (1), (3), (4) and (9) from the cab side boom HBCV in Step [1].

[5] Use a wrench (27 mm) to remove the boom bottom pressure sensor (10). •Mark the HBCV and hoses so that the connectors match at the time of assembly. •Use caps and 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.

[6] Use a hexagon wrench (8 mm) to remove the 4 hexagon socket head bolts (11), and then remove the line (12). •Use caps and 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.

1 Pilot hose (use 22 mm wrench) 3 Drain hose (use 19 mm wrench) 4 Pilot hose (use 22 mm wrench) 7 Bolt 8 Boom HBCV 9 Pilot hose (use 22 mm wrench) 10 Boom bottom pressure sensor 11 Bolt 12 Line

[7] Use a hexagon wrench (8 mm) to remove the 4 hexagon socket head bolts (13), and then remove the boom HBCV (14).

2.Installation of Arm HBCV

To install, perform the reverse of the removal procedure.

The tightening torque for line installation and HBCV installation is 51.2 ± 9.6 N•m.

13 Bolt 14 Boom HBCV