2018 Toolcat 5600, 2100hours, barely moving forward or backup after a hose break repair

[Interceptor]

I would be very surprised if the oil is the problem. It's not ideal to run the wrong type long term, but it won't cause the issue you're having. The sound in your video is not good enough to be helpful, but it looks like maybe the brake is not releasing.
That is a front drive motor hose that you repaired. Are you sure the field repair fitting is installed properly? I have seen where they cut into the inside of the hose when screwed in and create a flap of rubber that blocks the hose. It's not likely, but I've seen it happen and completely block flow.
I would get all four wheels off the ground and see what's happening. Does the TC have traction control?

 

[RichardV-Quebec]

Yes, that is why I asked what type you put in it.

Many years ago I had a Case 446 garden tractor that acted similar if you used hydraulic oil instead of the motor oil it was designed for.

I will change the oil today and let you know.

 

[RichardV-Quebec]

I would be very surprised if the oil is the problem. It's not ideal to run the wrong type long term, but it won't cause the issue you're having. The sound in your video is not good enough to be helpful, but it looks like maybe the brake is not releasing.
That is a front drive motor hose that you repaired. Are you sure the field repair fitting is installed properly? I have seen where they cut into the inside of the hose when screwed in and create a flap of rubber that blocks the hose. It's not likely, but I've seen it happen and completely block flow.
I would get all four wheels off the ground and see what's happening. Does the TC have traction control?

I thought that hose was going to the front equipment. I wanted to change the whole hose but couldn't figure out where the other end was going to without removing the cab. I know the guy who put the fitting had a hard time screwing it in the hose. I certainly will undo it and check that out. Not sure but I think the TC does have traction control by default ?

 

[Interceptor]

If I'm seeing it right, it's a drive motor hose. They attach to long straight fittings that extend out through the side of the frame. The other end goes to the piston pump in the center of the machine. I'm guessing something got into the hose when it was open and has now made it's way into the drive loop where it's causing problems. The hydrostatic drive system is closed circuit, most of the oil stays within the loop flowing round and round, only a small amount of oil is released and replenished for cooling. If a large piece of debris gets in there it will likely stay in there until you disassemble and remove it.
Traction control is optional. If your TC has it there will be a switch on the dash to turn it off. I have no personal experience with it but have read that a bad speed sensor can cause the traction control to do weird things.

 

[RichardV-Quebec]

If I'm seeing it right, it's a drive motor hose. They attach to long straight fittings that extend out through the side of the frame. The other end goes to the piston pump in the center of the machine. I'm guessing something got into the hose when it was open and has now made it's way into the drive loop where it's causing problems. The hydrostatic drive system is closed circuit, most of the oil stays within the loop flowing round and round, only a small amount of oil is released and replenished for cooling. If a large piece of debris gets in there it will likely stay in there until you disassemble and remove it.
Traction control is optional. If your TC has it there will be a switch on the dash to turn it off. I have no personal experience with it but have read that a bad speed sensor can cause the traction control to do weird things.

First, thank you very much for your feedback ! Yesterday, when I ordered the correct service manual for the AHG8 series, the dealer told me the parts catalog is online. I went and looked at the hydraulic section and YES, the two hoses go right into the front drive motor. I removed the front plate below the front attachment and confirmed. Had I known this when it broke, I would have been a LOT more carefull. (I had a bad experience with a D31PX-21 hydrostatic transmission where the swash plate cage bearing broke). It looks like I can access the other end of the hoses by removing the driver seat, the air filter cage and the hydraulic reservoir. Next step is to inspect the coupler fitting repair. I will let you know. Also, it turns out I have that switch.

 

[RichardV-Quebec]

Well, I decided to change the whole hose. I think the union fitting and the 90 degree fitting on the drive motor is causing restriction as opposed to the other hose below. Also I noticed one the rear motor pump is leaking a little bit on the hydraulic pump side, so ... I will change all 4 hoses and let you all know the results. What is the front below hose used for ? or how does this work ? Is flow always in one direction and a pilot line reverses the swash plate ? I saw there is one line to switch in high speed. How does reverse work ? I understand the brakes are inside the gear box according to the manual I have (which is not for my TC). Thanks to all for all the help.

 

[Interceptor]

The swashplate in the pump reverses flow to the motors. When traveling forward one hose is pressurized, and when traveling reverse the other hose is pressurized. The swashplate in the motors does not change direction, it only changes angle to switch between high and low speeds. So besides those two big drive loop hoses, there is a smaller third hose going to each motor to pressurize the two speed servo, and a fourth hose for case drain which bleeds off hot oil to be filtered and cooled.