Stuck at idle after changing Hydraulic filter

[Stephen]

I have a 1993 742B Mitsubishi propane. I just had the head off to rebuild and new gasget and radiator. I had problems with the timing aftrer reinstalling the head, but figured it out and had it running sweet. Here is when my trouble started. I changed hydraulic filter, and when I started the engine it revved normal for about 10 secs and then dropped to idle. After looking around for a bit, then put old filter back on after filling it full of fluid. I can raise the loading arms at idle but they will not drop down untill I shut the engine off. Is there a airlock or safety switch in the hydraulics. I did add more fluid to the reservouir after changing the filters. Did I add to much? The manual says only add to the sight glass, but I might have overfilled it. Any thoughts are appreciatted

 

[OldMachinist]

Follow the linkage from the throttle control and make sure it still connected to the governor
Check the governor belt is there and adjusted properly.
Check the linkage from the governor to the carburetor.

 

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Follow the linkage from the throttle control and make sure it still connected to the governor
Check the governor belt is there and adjusted properly.
Check the linkage from the governor to the carburetor.

are the aux hydraulics engaged?

 

[Stephen]

are the aux hydraulics engaged?

I have checked linkage. Seems to be working fine, was able to move throttle at carb, with no reaction. I am not sure about the aux hydraulics, I will definitly look at that when i am there on sat. Is it possible there is an airlock in the hydraulics?

 

[[email protected]]

I have checked linkage. Seems to be working fine, was able to move throttle at carb, with no reaction. I am not sure about the aux hydraulics, I will definitly look at that when i am there on sat. Is it possible there is an airlock in the hydraulics?

when the aux hydraulics are engaged with nothing connected it makes the arms and tilt act really strange. . and it puts a load on the engine. i bet climbing into the machine you knocked it by accident.

 

[OldMachinist]

when the aux hydraulics are engaged with nothing connected it makes the arms and tilt act really strange. . and it puts a load on the engine. i bet climbing into the machine you knocked it by accident.

So are you saying that with the engine running you moved the carb linkage and there was no change in rpm?

 

[Stephen]

So are you saying that with the engine running you moved the carb linkage and there was no change in rpm?

Yes exactly, I was able to reach in and move the linkage at the carb. it also moves from the throttle in cab.

 

[OldMachinist]

Yes exactly, I was able to reach in and move the linkage at the carb. it also moves from the throttle in cab.

If it's the same propane bottle that it ran on fine before. Does it have the inline solenoid and filter like other propane systems? Maybe the filter is clogged.

 

[Stephen]

If it's the same propane bottle that it ran on fine before. Does it have the inline solenoid and filter like other propane systems? Maybe the filter is clogged.

I believe the solenoid is just below the hydraulic filter, I wonder if some fluid dripped down when I pulled the hydraulic filter of. I will have a look at that. Whats involved in re and re it? any ideas.