I have a Yale GLC030 (GLC030BFNUAE082LPS - SN A809N02334T). It is one of those situations - I have owned it for 5 years and bought it cheap. It has been reliable and I use it once a month or so.

Recently it has not wanted to lift. Just to raise the boom with no weight, it goes pretty slow and I have floor the gas to get it to go up. If I add weight, I don't get very far and it stops.

I have also noticed when I put it in forward, it hesitates and then pulses forward. That seems pretty new and it didn't really do that in the past. I could live with that, I just need it to lift.

What are the first-things-first that I should look at. I checked hydraulic fluid and it is full.

I haven't done much more than change the oil on this. So, maybe a filter is clogged? I am looking for ideas.

Here is a video: https://photos.app.goo.gl/NhW99f3pL7ZuKFei8