Hitachi ZX470-5A, Zx490LCH-5A and ZX530LCH-5A Excavator Manual

The manual is applicable for the Hitachi Excavator Model:

• ZX470-5A
• ZX470LC-5A
• ZX490H-5A
• ZX490LCH-5A
• ZX530LCH-5A

Format: PDF
Language: English
Service Manual consists of the following:

For Model ZAXIS ZX470-5A, ZX490LCH-5A and ZX530LCH-5A as mentioned above:

Service Manual (Troubleshooting) Vol. No. TOJAE-EN : 458 Pages
Service Manual (Operation) Vol. No. TTJAE-EN : 388 Pages
Workshop Manual Vol. No. WJAE-EN : 605 Pages

Circuit diagram: 21 Pages

SI Units (International System of Units) are used in those manual.

Manual guide composition

Hitachi ZX470-5A, ZX490LCH-5A and ZX530LCH-5A service manual consists of the Operating, Troubleshooting and the Workshop Manual.

• Information included in the Service Manual: Technical information needed for redelivery and delivery, operation and activation of all devices and systems, operational performance tests, and troubleshooting procedures.
• Information included in the Workshop Manual: Technical information needed for maintenance and repair of the machine, tools and devices needed for maintenance and repair, maintenance standards, and removal / installation and assemble / disassemble procedures.

To avoid injury and damage refer to the service manual and be sure to use appropriate lifting techniques and equipment when lifting heavy parts.

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Pump Control Solenoid Valve Extract:

The pump control solenoid valve is provided on the regulator of the main pump.
According to the signal from MC, the pump control solenoid valve controls the flow rate control pressure Pi that acts on the regulator, and increase or decrease the pump delivery flow rate.
Operation
– In Neutral
1. Port P (5) and output port (4) are closed by spool (3).
2. Output port (4) and port T (8) are connected through the open part of spool (3).
– In Operation
1. When solenoid (7) receives a signal from MC, it is activated and pushes piston (6).
2. Piston (6) shifts spool (3), port P (5) and output port (4) are connected through the open part of spool (3).
3. Therefore, pressure at output port (4) begins to increase.
4. The left and right side diameter of the open part of spool (3), B is larger than A.
5. Therefore, when pressure at output port (4) begins to increase, spool (3) is move to the left due to the force as Fsol(9)+P1A+S1>P1B+S2.
6. When pressure at output port (4) increases and the following formula exists, Fsol(9)+P1A+S1=P1B+S2, spool (3) is stopped.
P1: Pressure at Output Port (4)
A,B: Pressure Receiving Area on Spool (3)
S1: Spring 1 (1) Force (Force pushing spool (3) to the left)
S2: Spring 2 (2) Force (Force returning spool (3) to the right)
Fsol: Solenoid (7) Force