Hitachi ZX450-3, ZX470LCH-3 and ZX520LCH-3 Excavator Service Repair Manual
The manual is applicable for the Hitachi Excavator Model:
- ZX450-3
- ZX450LC-3
- ZX470H-3
- ZX470LCH-3
- ZX500LC-3
- ZX520LCH-3
Format: PDF
Language: English
Service Manual consists of the following:
For Model ZX450-3, ZX470LCH-3, ZX520LCH-3 and others as mentioned above:
Service Manual (Troubleshooting) Vol. No. TO1J1-E
Service Manual (Operation) Vol. No. TT1J1-E
Workshop Manual Vol. No. W1J1-E
Parts Catalog Manual P1J1-1-1
Owners Instructions
Circuit diagram
SI Units (International System of Units) are used in those manual.
Manual guide composition
Hitachi Zaxis ZX450-3, ZX450LC-3, ZX470H-3, ZX470LCH-3, ZX500LC-3, ZX520LCH-3 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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REGENERATIVE VALVE Extract From Manual Instructions:
The regenerative valves are provided in the boom lower, arm roll-in and bucket roll-in circuits. The regenerative valve increases cylinder speeds in order to cylinder hesitation, and improve machine controllability.
Operation of Boom Regenerative Valve
1. During boom lower operation, return oil from the cylinder bottom side enters hole on the spool and acts on the check valve.
2. During boom lower operation, the boom is lowered faster as compared with amount of supply from the pump due to boom own weight.
3. Therefore, pressure in the circuit between pump and boom cylinder rod decreases.
4. When pressure in the cylinder rod side becomes lower than that in the bottom side, the check valve opens.
5. Consequently, return oil from the cylinder bottom side flows to the rod side, is combined with pressure oil from pump 1, and is supplied to the cylinder rod side so that the regenerative operation is done.
6. Therefore, speed of the cylinder increases.
7. When the cylinder is moved full stroke or the load increases, pressure in the cylinder rod side circuit increases more than that in the bottom side.
8. Consequently, the check valve is closed and regenerative operation stops.
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