MX5800 FEL slow

[eod99]

I have a MX5800 HST 1089hrs, has Kubota 3rd function. I was removing my grapple to install pallet forks and noticed my grapple would not open, and like everything around here no time to diag had to load trailer. So I put forks on loaded trailer and as I finished I noticed my fel was going extremely slow up and down but tilt was normal speed and if I shoved stick into "float" mode it would lower quickly or if I tilted while lowering or raising it would go at normal speed. So I am going to start troubleshooting in the a.m.
Should I look at 3rd function electrical 1st or hydraulic side? I have the service manual but it has nothing on 3rd function

TIA

 

[North Idaho Wolfman]

First thing to check is any quick disconnect on the loader connections.
Second thing to check is that the three point is not is the uppermost position and see if that helps your situation.

 

[TheOldHokie]

First thing to check is any quick disconnect on the loader connections.
Second thing to check is that the three point is not is the uppermost position and see if that helps your situation.

Add check that any rear remote valves are in neutral to that list.

Dan

 

[eod99]

Ok tractor has no rear remotes. I checked quick couplers where grapple plugs in I manually pushed both check balls in fluid released outta both and now fel works like it should. 3pt lever is not pinned all the way up.
Thanks for advise, is there a schematic of this hydraulic system that has testing procedures if anything else happens?

 

[TheOldHokie]

Ok tractor has no rear remotes. I checked quick couplers where grapple plugs in I manually pushed both check balls in fluid released outta both and now fel works like it should. 3pt lever is not pinned all the way up.
Thanks for advise, is there a schematic of this hydraulic system that has testing procedures if anything else happens?

Get a copy of the WSM. It has detailed information on the hydrauluc system but you have to "think your way" to diagnostic procefures. The system is very simple and easy to analyze if you have a basic understanding of hydraulics.

In this case it sounds like your third function valve msy have been stuck and not returning to neutral which blocks the outflow on the boom section of the loader valve. No outflow = no lift or lower.

Dan

 

[eod99]

Get a copy of the WSM. It has detailed information on the hydrauluc system but you have to "think your way" to diagnostic procefures. The system is very simple and easy to analyze if you have a basic understanding of hydraulics.

In this case it sounds like your third function valve msy have been stuck and not returning to neutral which blocks the outflow on the boom section of the loader valve. No outflow = no lift or lower.

Dan

So my wsm has nothing on third function valve is there a service manual for third function. Once I release pressure I am guessing it released valve, since originally my grapple wasn't working if I hook it back up should operate like designed now

 

[TheOldHokie]

So my wsm has nothing on third function valve is there a service manual for third function. Once I release pressure I am guessing it released valve, since originally my grapple wasn't working if I hook it back up should operate like designed now

Your third function is just a single dpool AUX valve fed by the PB port on the loader valve. It in turn feeds the 3pt valve.

Pencil it in to the circuit diagram in the WSM. If you post a good picture of the diagram I will do that for you.

Dan

 

[eod99]

Your third function is just a single dpool AUX valve fed by the PB port on the loader valve. It in turn feeds the 3pt valve.

Pencil it in to the circuit diagram in the WSM. If you post a good picture of the diagram I will do that for you.

Dan

Ok as fast as I get back to book I will do that, thank you........

 

[TheOldHokie]

Ok as fast as I get back to book I will do that, thank you........

You are welcome. I was impressed you knew how to test the cylinders. You are definitly not a hydraulic dummy

Read the description of the loader valve functions carefully. The boom section is in series with the bucket section and the bucket spool dump function is regenerative. That can produce symptoms that confuse most people.

Dan