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Hitachi ex200-2 swing slow and all other functions normal…

Customer Question
Hitachi ex200-2 swing slow...

Hitachi ex200-2 swing slow and all other functions normal worked fine until setting for 2 weeks then after moving around for a few minutes started to operate at spec 13 rpm now set again ffor a while now slow

Mechanic's Assistant: What is the complete model and serial number of your machine?

Ex200-2 ser 14770094

Submitted: 5 years ago.Category: Construction and Road Equipment
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Answered in 4 hours by:
2/22/2017
Mechanic: Dan, Technician replied 5 years ago
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 14,863
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
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Hi my name is***** will be glad to try to help. Check the filter for fine metal/debris indicating an internal pump or component failure occurring. If okay check the relief valves and control valves for problems. Look for damaged o rings or debris causing them to stick. Let me know

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Customer reply replied 5 years ago
Dan can u send me a view of bypass valves to check
Mechanic: Dan, Technician replied 5 years ago

Thanks for the update.... Click on this link. This is what the relief valves look like

https://www.bonanza.com/listings/Hitachi-EX200-2-excavator-main-pressure-relief-spillover-valve-4289602/326106317?goog_pla=1&gpid=76983190261&keyword=&goog_pla=1&pos=1o1&ad_type=pla&gclid=CLWj39vPr9ICFYhMDQodhk0KhQ

Also

http://www.finotek.com/hitachi-ex200-excavator-valve/

They are threaded into the main control valve behind the base of the boom. Also there will be relief valves threaded into the swing motor itself. Let me know

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Dan
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 14,863
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Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.

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