1. Hitachi excavator disassembly
Lower the working device to the ground, turn off the engine, slowly loosen the hydraulic oil tank cap to reduce the internal pressure, and
The lock lever is placed in the locked position.
① Rotate the upper turning platform 90°.
② Remove the lower cover of the fuel tank.
③ Open the engine cover upward.
④ As shown in Figure 4-54, remove the drain plug of the hydraulic oil cooler to drain the hydraulic oil. Loosen the upper (oil return) hose of the hydraulic oil tank and introduce air into the oil tank.
The hydraulic oil cooler has a volume of about 7L.
1—Engine cover; 2—hydraulic cooler drain plug Figure 4-54 hydraulic coolant drain plug
⑤ Move the cover.
⑥ Open the left side cover.
⑦ Disconnect the discharge hose of the control valve shown in Figure 4-55 to stop the flow of oil.
⑧ As shown in Figure 4-56, disconnect the water tank hose.
⑨ Remove the lower cover.
⑩ Disconnect the hydraulic oil tank return hose shown in Figure 4-57 to stop the flow of oil.
Figure 4-55 Control valve discharge hose
1—Water tank hose: 2—Lower cover Figure 4-56 Remove water tank hose
1—Hydraulic oil cooler mounting bolt; 2—Hydraulic oil tank oil return hose Figure 4-57 Disconnect hydraulic oil tank oil return hose
? Remove the mounting bolts of the hydraulic oil cooler.
? Move the upper cover.
? Lift out the hydraulic oil cooler assembly by using eye bolts.
2. Installation
Install components in the reverse order of removal.
① Make sure that the heat-insulating sealing material (sponge) of the outer turning part of the radiator is not damaged. If the heat insulation seal material (sponge) is damaged, it needs to be replaced.
② As shown in Figure 4.58, confirm from the bottom of the cylinder side that the convex surface of the radiator is properly placed on the concave surface.
1—convex; 2—concave Figure 4-58 Install the radiator
③ Add hydraulic oil to the hydraulic oil tank. Add the hydraulic pressure to the specified oil level through the oil filling port. Start the engine, allow the oil to circulate in the hydraulic system, and then check the oil level.
