Description

Hitachi ZX670LC-6, ZX690LCR-6 and ZX690LCH-6 Excavator Manual

The manual is applicable for the Hitachi Excavator Model:

• ZX670LC-6
• ZX690LCR-6
• ZX690LCH-6

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

For Model ZX670LC-6, ZX690LCR-6 and ZX690LCH-6 as mentioned above:

Service Manual (Troubleshooting) Vol. No. TOJBK40-EN : 490 Pages
Service Manual (Operation) Vol. No. TTJBK40-EN : 455 Pages
Workshop Manual Vol. No. WJBK40-EN : 769 Pages

Circuit diagram: 35 Pages

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

Manual guide composition

Hitachi ZX670LC-6, ZX690LCR-6 and ZX690LCH-6 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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Bypass Shut-Out Valve Manual Instructions Extract:
Bypass shut-out valves (9, 17) are provided in the down stream side of neutral circuit (pump 1) (15) and neutral circuit (pump 2) (16).
Bypass shut-out valve (9) blocks neutral circuit (pump 1) (15), combines pressure oil from pump 1 (10) with pump 2 (11), increases oil flow rate flowing into attachment (1) to increase attachment (1) operation speed.
Bypass shut-out valve (17) blocks neutral circuit (pump 2) (16), combines pressure oil from pump 1 (10) with pump 2 (11), increases oil flow rate flowing into the bucket cylinder to increase the bucket operation speed.

Bucket Flow Combiner Circuit
1. Pilot pressure (d) from 4-spool solenoid valve unit (SF) (19) shifts bypass shut-out valve (17) of neutral circuit (pump 2) (16).
2. As neutral circuit (pump 2) (16) is blocked, pressure oil from pump 2 (11) is combined with pressure oil from pump 1 (10). The combined oil is supplied to bucket spool (18).
3. Consequently, operation speed of the bucket is increased