No power on 3720

magoo6 said:

How can we took it off to verify it?

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Depending on your serial number and whether or not you have a cab, it could be a little different, but it looks like you should be able to remove 3 hose clamps and remove/replace this hose. There appears to be an internal spring to keep it from collapsing, so it seems less likely to be an issue, but I have seen reports of others needing to replace this hose.

magoo6 said:

It's still drop but I found something but I found a pipe that is crush. I wonder if it could be the problem View attachment 892871

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The crushed line appears to be the top line to the hydraulic oil cooler.

The hydraulic oil cooler is supplied oil by the steering pump. The steering pump pressure is up to 1500 psi on the inlet to the steering control valve (SCV), but downstream of the SCV it becomes charge pressure for the Hydrostatic transmission and is regulated to <250 psi.

The hydraulic oil cooler is located between the SCV and the Hydrostatic transmission where the steering pump supplied oil pressure is <250 psi.

While it isn't ideal to have a flow restriction due to a somewhat crushed oil cooler inlet/outlet line, it may or may not significantly affect the charge pressure to the Hydrostatic transmission.

Monitoring the Hydrostatic transmission charge pressure via the port provided to make that measurement would tell you for sure if the transmission is getting sufficient charge pressure (and thus flow).

You could also just replace that crushed line to remove any concern that this is causing your issues.

hoss710 said:

that crimp can't be helping things at all !!

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Well we went back to the dealer and they had removed the hydraulic oil cooling radiator to clean it so it was one of the mechanics who accidentally crushed the pipe. They will correct their error at their expense. It remains to be seen if this will solve the problem of the loss of power of our tractor.

we had a John Deere skidsteer that had a loose fitting to the main pump and it would suck air and over heat and foam up the fluid and leak out the breather, they thought the hydraulic tank was leaking, I wonder if you can check and see if that is happening, run it for a while and see if it foams up in the reservoir, the other thing is the hydrostatic pump having reached the end of it's life and is leaking too much oil internally causing excess heat.