LS190.B hydraulic issue

[Griz716]

My first post here so hello everyone and hope you can help! NH LS190.b .... the machine drives fine, but boom and bucket tilt won’t work. If you increase throttle it will lift the boom with no attachment, but put on the bucket and won’t even lift that. No recent work done and I do regular maintenance. Literally happened overnight. Pressure relief valve? If so which one is it on the control valve?

 

[Griz716]

Could it be the pump? The best option I found for a replacement is $700, so I'd like to know for sure that is the problem, but not sure how to narrow it down and confirm the issue. Again, any help would be appreciated!

 

[flyerdan]

Could it be the pump? The best option I found for a replacement is $700, so I'd like to know for sure that is the problem, but not sure how to narrow it down and confirm the issue. Again, any help would be appreciated!

I'd think the first thing you should do is put a pressure gauge on the aux port and see what kind of reading you get before throwing spendy parts at it. It could also be something like a failed woodruff key; I assume that the hyd pump is driven off the end of the duplex.

 

[Griz716]

I'd think the first thing you should do is put a pressure gauge on the aux port and see what kind of reading you get before throwing spendy parts at it. It could also be something like a failed woodruff key; I assume that the hyd pump is driven off the end of the duplex.

I engage the aux hydraulics and it barely bogs the engine so assuming the pressure isn't there. I don't have a gauge, but may invest in one. The only way to diagnose a failed woodruff would be to remove and open up the pump, correct?