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Hitachi EX200LC Problem

Dirtman2007

Dirtman2007

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Sep 30, 2007
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1,202
Location
Raleigh, North Carolina
Occupation
Heavy Equipment Operator
My buddy has this machine. I think its a 93 model maybe a tad newer. The other day it started messing up on him. The machine will start but will not idle up. When they get the machine reved up they hydraulics are really slow and you can tell somethings not right

Here's a video of what its doing. any Idea's on what the problem may be? he tried putting another computer on it and that didn't work, although the computer he got was used and could have been bad as well.


The video
YouTube - Hitachi with electronic problem
 
T

tool_king

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Joined
Mar 29, 2010
Messages
2,151
Location
new jersey
Occupation
road mechanic owner
sound like you have a load sensor not working .What is the machine serial number ? I can look up the schematic for this mechanic.I have the
Hitachi manuals
 
C

cps

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Jul 13, 2008
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811
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Ireland
Occupation
plant mechanic
I would check the batteries and alternator aswel, i have seen things like this happen when there is not enough power (voltage) to work the electrical funcions!

Just a thought! CPS
 
T

tctractors

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Oct 9, 2007
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2,412
Location
Worc U.K.
It sounds like the power demand screen is blocked, this is a union screwed into the main valve block with a smallish pipe hooked in to it, the filter is built into the union and near impossible to clean out giving a good result, dont be tempted to pierce a hole in the screen as it just causes damage, if you could post a pic of your valve block I would be happy to point out the union, they are not a costly item and need replacing after about 6'000 hrs usualy.

tctractors
 
R

rgl726

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Sep 11, 2010
Messages
175
Location
cebu city, philippines
you have a pvc problem. ask -3Doc about this problem he can help you.

changing the the pvc controller will not automatically solve the problem.

you must check all the wiring continuity for all the sensors and check the sensors if they are good or bad.

e.g. DP sensor, pressure sensor, angle sensor, rpm sensor, high speed solenoid.

i can supply you bnew PVC if you want.
 
M

macleandawn

New Member
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Nov 2, 2010
Messages
4
Location
Canada
I have the exact same problem with my 94 EX200LC-2. It will make an attempt at the functions but thats it. The light on our PVC is not on as well which lead us to beleive it was the PVC, we sent it to an electronics place and had it tested and everything was fine. We plugged it into another machine and the light came on, so we moved on to the wiring, but theres continuity, all the right wires have power and grounds, and all the fuses are fine. Any other suggestions?
 
R

rgl726

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Sep 11, 2010
Messages
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cebu city, philippines
test all your sensors and solenoids. angle, pressure, rpm, DP sensor, and pump displacement solenoid. check the resistance.
 
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M

macleandawn

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Nov 2, 2010
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The Dr. Ex also wont comunicate with my machine to diagnose the problem.
How do you test the solenoids and sensors?
 
cutting edge

cutting edge

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upper canuckistan
macleandawn said:
The Dr. Ex also wont comunicate with my machine to diagnose the problem.
How do you test the solenoids and sensors?
Click to expand...

With the machine TURNED OFF,disconnect all of the sensors feeding the PvC.

Turn the machine on and check the LED on the PVC,to see if it is flashing now.

If it is,turn the machine OFF and plug one sensor back in.

Turn the machine ON and check the led.

When you find the sensor that makes the LED go out,there's your problem....these PVC would shut down entirely to protect themselves instead of giving you a code.

You'll notice how I was pretty clear about turning the key off and on.....never disconnect or connect any sensor or ec motor on this vintage machine with the power on.....recipie for electrical disaster,or at least a blown out PVC

FWIW, I'll bet it's one of your pump pressure sensors giving you grief.
 
R

rusty13

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Jun 20, 2011
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Location
gp ab
my hydrolics are very weak like the high speed selenoid is keeping the flow down. the machine will idle up and the ec and pvc have red flashing lights when i turn on the key. when i turn of theunit and unplug the high speed selenoids the machine has full hydrolic power but too much unless i am in constant motion in multiple directions. the pressure sensor has been replaced and continuity checked all is good. what is the resistence of the selenoids supposed to be becuse i think they might be the problem because they are not clicking when i start the machine and function the hydrolics. however i didnt check the continuity to the selenoids but they must be getting power because when they are unplugged they open up wide and when they are plugged in they close up tight. please help i don't know what to do
 
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masseymgr

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Jun 19, 2011
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4
Location
Indiana
I have a very similiar problem with my 1997 Deere 690 E LC. Works fine part of the time, then will go into a slow motion mode on every function - dig, swing, travel forward or backwards. The higher you rev the motor, the slower it goes. Problem comes and goes, sometimes several times in a day. May last 10 minutes, may last 2 hours. Deere checked all pressures and sensors, all check out fine. Hydraulic filters are new and oil is fresh. New pump too. Seems electrical to me, but have no idea how to check if it is the computer and can find no one who can offer any assistance on the computer either. Any one have any suggestions? Thanks
 
cutting edge

cutting edge

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upper canuckistan
masseymgr said:
I have a very similiar problem with my 1997 Deere 690 E LC. Works fine part of the time, then will go into a slow motion mode on every function - dig, swing, travel forward or backwards. The higher you rev the motor, the slower it goes. Problem comes and goes, sometimes several times in a day. May last 10 minutes, may last 2 hours. Deere checked all pressures and sensors, all check out fine. Hydraulic filters are new and oil is fresh. New pump too. Seems electrical to me, but have no idea how to check if it is the computer and can find no one who can offer any assistance on the computer either. Any one have any suggestions? Thanks
Click to expand...

Your throttle linkage is worn out. There is also a ball bearing on the throttle control that you will find has a flat spot worn into it...fix that too.

Put your machine at high idle and pull the throttle lever to the high idle stop with a bungee....Ill bet it runs just fine if you do that
 
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masseymgr

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Indiana
Thank you for the info. I will definiately check that out this weekend and try the bunge. When you say "put the machine at high idle" what exactly do you mean? Is that the setting just above the lowest idle position, or is that full throttle?
Is this something that requires a Deere mechanic, or is this an easy fix? Throttle linkage and throttle control with the ball bearing all one unit? Sorry for so many questions. Just want to get the right info so I can finally get this thing fixed. Thanks again for any info you can provide.
 
ZAXIS

ZAXIS

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Jonesboro, Arkansas
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Mgr./Member of Rainwater Construction Company, LLC
masseymgr, We had a 690E & at one time had a similar problem with inconsistent performance, was very frustrating-ended up being the water/fuel seperator filter was in need of replacing. Was an easy fix. Hope yours is as well.
 
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ZAXIS

ZAXIS

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We also had to have our throttle linkage replaced at about 6000 hrs. Was not running properly in the "modes". This helped the machine in that perspective. It really sounds to me like a fuel problem similar to the one I previously mentioned.
 
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masseymgr

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Zaxis, thanks for the additional info. I have already replaced both the fuel filter and the fuel/water seperator. No change in performance. Checked governor linkage today. Seems to have a slight catch in it, but not alot. Ran machine, started out fine, went into "slow mode" again for a while, then came out of it and ran fine for 3 hours. Guess I will call Deere and price gov. linkage and anything else that goes with it and hope for the best. Anyone want to buy a Deere 690 E LC??? This thing is trying my patience and killing my productivity.......................
 
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