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I did some testing on this over the weekend.
I picked up a hydraulic hose, a T connector and gauge from Napa.
I first connected the gauge directly to one of the loader valve output ports to set the pressure relief to 2000 psi. I know this is 200 lbs over the manual spec but this is just a test. Then, I used the T connector with the gauge to connect it in line with the P output from the main Hydraulic block. This way I can monitor the hydro pressure from the pump while in use. When using the loader, the pressure stays around 500 lbs unless I try to lift the tractor with it or something heavy. When I use the 3-point lift, it starts around 1000 psi for a few seconds, then jumps to 2000 psi which causes the loader valve to squeal (since it's in the same loop). This is with absolutely nothing attached to the 3 point. I thought perhaps there is something wrong with the loader valve so I took it out of the loop. I disconnected the loader entirely and connected the P and N ports on the Hydro block as the manual states. I also moved the switch on the side from the "S" to the "O" position. I tested the 3-point again and it acted in the same way, 1000 psi to start, then jumps to over 2000 psi. No loader valve squeal though since it isn't connected but it was using another pressure relief bypass somewhere. It also loaded down the motor.
I thought maybe there is a mechanical bind somewhere in the lift arms but I can lift it myself with no effort.
Do I have a bad 3-point lift control valve?
Bad hydraulic cylinder?
Clogged up line or something?

Front End Loader relief valve squeals when 3 point is used
Cub Cadet
Replies 11 Post by jfortune06

jfortune06 has posted a new photo.

Subject: My Tractor.

Description: <br>Cub Cadet 7300 and my oldest boy

My Tractor - New Pix by jfortune06
Photos
Replies 1 Post by jfortune06

I have a cub 7300 with this exact issue as well. I did adjust the relief valve in the loader control block just enough to stop the squealing when using the 3 point lift. I didn't have a gauge to measure the pressure but will do this later before using the loader for anything heavy. One thing I don't get is, why does the 3 point lift seem to put so much pressure on the system when lifting almost no weight. I currently only have a trailer mover on there which weighs maybe 50 lbs. It seems that the pressure increases greatly the closer to the top that the lift gets. Is this normal? I can see the loader hydraulic lines tighten up every time I lift the 3 point.

Hydraulic problem on MMM
Cub Cadet
Replies 33 Post by jfortune06