Removal and Installation of Hydraulic Pump

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

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 wrenches (8 mm, 10 mm, 14 mm) •Nylon sling (with the required breaking load) •Liftcrane (with the required lifting capacity) •Marking pen •Cap •Plug •Rag •Cleaning fluid •Wood planks, etc. 1.Removal of hydraulic pump [1] Use a wrench (19 mm) to remove the 8 bolts (1), and then remove the under covers (2) (3). •Remove the under covers (2) → (3) in that order.

[2] Remove the engine hood.

For the procedure, see "Removal Procedure of

Engine Hood". [3] Use a wrench (19 mm) to remove the 6 bolts (4) and 6 washers from the top cover.

[4] Use a wrench (19 mm) to remove the 18 bolts (5), and then install the covers (6) (7) (8) (9). •Remove the covers (6) → (7) → (8) → (9) in that order.

[5] Remove the top cover (10).

[6] Use a wrench (19 mm) to remove the 2 bolts (12) and 2 nuts (11), and then remove the exhaust pipe seal clamp (13).

[7] Use a wrench (17 mm) to remove the 4 nuts (14). [8] Remove the U-bolts (15), and then remove the muffler (16).

[9] Remove the hoses and connectors that are connected to the pump. •Use a hexagon wrench (10 mm) to remove the 8 hose bolts (17), and remove the pressure hose (18). •Use a hexagon wrench (8 mm) to remove the bolts (19), and then remove the drain hose (20). •Use a wrench (27 mm) to remove the gear pump discharge hose (21). •Use a wrench (19 mm) to remove the 3 pilot hoses (22). •Remove the connectors (23) (24). •Use a wrench (19 mm) to remove the pilot hose (25). •Use a wrench (36 mm) to remove the suction hoses (26). •Use a wrench (36 mm) to remove the gear pump suction hose (27). •Remove the connector (28). •Use a hexagon wrench (14 mm) to remove the suction line bolts (2 bolts in the front, 2 bolts in the rear), and remove the suction line (29). •Mark the pump and hoses so that the connectors match at the time of assembly. •Attach caps or plugs to the pump and hoses to prevent any entry of water, dust or dirt. •Clean the pump and hoses by spraying with a parts cleaner to prevent scratches and prevent dirt from accumulating on the connectors.

[10]Secure the pump with a liftcrane and nylon sling (30) so that it does not fall during removal and installation operations.

[11]Use a wrench (19 mm) to remove the 16 bolts (31) and washers from the pump.

[12]Use a liftcrane and the nylon sling (30) to pull the pump out from the shaft and lift the pump.

[13]Thoroughly check that the location is safe before placing the pump on the wood plank (32). •Thoroughly secure the pump so that it does not fall over.

2.Installation of hydraulic pump

Perform the reverse of the removal procedure.

The tightening torque for the pump bolt (1) is 88 108 N•m.

Fill the pump case with hydraulic oil from the drain port so that no air remains in the pump case.

Additionally, when there is a 2nd option gear pump, bleed off air from the air bleed port.