Hitachi ZX75US-5A and ZX85US-5A Excavator Service Repair Manual
The manual is applicable for the ZX800 Hitachi Excavator Model
Format: PDF
Language: English
Service Manual consists of the following:
For Model ZAXIS ZX800 as mentioned above:
Service Manual (Troubleshooting) : Vol. No.TO17VE
Service Manual (Operation) : Vol. No.TT17VE
Workshop Manual : Vol. No.W17VE
Parts Catalog
Circuit Diagram
SI Units (International System of Units) are used in those manual.
Manual guide composition
Hitachi ZX800 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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Hydraulic System Main Circuit Extract Outline
• Main pumps (1 and 2) draw hydraulic oil from the hydraulic oil tank. Main pump 1 and main pump 2 deliver pressure oil to the 4-spool control valve and the 5-spool control valve respectively.
• Delivered pressure oil is routed to the motor(s) or cylinder(s) in response to operation(s) of the spool(s) in the control valve(s).
• The return oil from the motor(s) and/or cylinder(s) flows back to the hydraulic oil tank via the control valve and/or the oil cooler.
• When the oil temperature is low (high viscosity), the oil flow resistance increases in the oil cooler, which opens the bypass check valve, allowing hydraulic oil to return directly to the hydraulic oil tank without passing through the oil cooler.
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