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Crawlers, Dozers, Loaders & Backhoes Discussion Board

Re: hitachi 120-3 hydraulic problem, need shop manual


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Posted by NCWayne on July 25, 2012 at 09:06:37 from (69.40.232.132):

In Reply to: Re: hitachi 120-3 hydraulic problem, need shop manual posted by wilko on July 24, 2012 at 18:19:34:

Just posted the other reply and a new thought hit. When you travel there is a valve in the system that is called by several names like the cross over valve, the merge-divide valve, the straight travel valve, etc. It's function is to tie the flow from both pumps together in order to insure the flow going to each track motor is the same and, as one name states, to insure the machine travels in a straight line instead of vering off to one side due to one motor getting a bit more or less flow than the other. Too it can be opened when certain functions, like boom up, are actuated to give a higher flow to the function and thereby increase cycle times. If that valve were to stick open it could possibly cause problems with the other functions that operated off of one pump because it could blead off the pressure/flow from the one pump if the other pump wasn't active at the time. This scenerio is kind of stretching things a bit because several factors would all have to combine for it to possibly happen, but when brainstorning a problem like this you have to look at everything and eliminate the potential problems in the quest to zero in and find the actual problem.


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