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Have a EX200-3 1996 when operating the hydraulics will all…

Have a EX200-3 1996 when...
Have a EX200-3 1996 when operating the hydraulics will all of a sudden load up the engine and the only way to reset hydraulics is to switch the key off and start again or pull the 1 amp fuse and replace then it will be fine for a period of time and then it will do it again.
When this happens engine will not rev above low setting until stopped & restarted or fuse is pulled and put back in
Thanks Gary
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Answered in 20 minutes by:
11/29/2014
Mechanic: Dan, Technician replied 7 years ago
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 14,846
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
Verified
Dan :

Hi my name is***** will try to help. First inspect your in tank return filter for metal/debris just to be sure you do not have a pump or component failure occurring. If ok then you could possibly have a controller problem. Are you getting any faults on the display?

Customer:

Oil drained and replaced with new filter

Dan :

Did you find any fine metal?

Customer:

Only water temp if u do not stop and reset

Dan :

It will look like metallic glitter

Customer:

No metal

Dan :

Ok thats a good sign

Dan :

So the Auto idle/decel function and throttle controls working normal?

Customer:

When not under load from hydraulics

Dan :

Is it any particular function that triggers it?

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Mechanic: Dan, Technician replied 7 years ago
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Customer reply replied 7 years ago

Did not get an answer

Mechanic: Dan, Technician replied 7 years ago
I switched to this sceen so we can continue to post back and forth... Check your relief valve cartridges in the main control valve for damaged o rings or a possible relief that is sticking. Also for a possible spool sticking in the control valve. I recommend having your pressures tested and monitored when this is occuring to see what they are doing to isolate this to a possible relief valve, pump, or control valve problem. Your pump could be getting stuck in full stroke. Let me know.
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 14,846
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
Verified
Dan and 87 other Construction and Road Equipment Specialists are ready to help you
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Customer reply replied 7 years ago

Machine recently pressure checked by Hitachi all to spec

Mechanic: Dan, Technician replied 7 years ago
Hi please save your ratings until we are finished. I switched to this screen so we can continue to post information as needed to narrow this down. I had to tend to my 4 year old daughter who had woken up. Was these checks done before or after this problem started? I worked for my local Hitachi/Deere dealer before going independent. Testing pressures is part of troubleshooting a problem. Let me know.
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Mechanic: Dan, Technician replied 7 years ago
Hi, did you get this resolved or do you still need help with this?
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Customer reply replied 7 years ago
Turned out being spring clip where shaft of A sensor shaft locates was out of shape allowing mixed signals
Mechanic: Dan, Technician replied 7 years ago
Thanks for the update Gary. Glad you got this resolved. Have a great weekend.
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Dan
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