All hydraulics quit on 2015 Bobcat T-650 skid steer. Replaced drive belt. Machine runs but no hydraulics to drive or lift, etc. Oem fluids. ???

Could be a seal blown in the pump or control valve assembly.

If no hydraulics are operating then there may be a few things to look at. Check the hydraulic fluid level as drive and bucket controls are hydraulic based. The hydraulic pump is shaft driven by the hydrostatic pump. If the fluid level is not proper, this could cause symptoms. Air in the system is another factor but most systems are self purging.

There are filters in various points around the unit and are 40 micron. Main filter has s bypass should filter be clogged. However, the smaller filters do not. The hydraulic system stays at charge pressure and fluid flows through control valves until actuated. If a spool is stuck, it may be bypassing fluid not allowing pressure to build up. Should give a basic starting point to troubleshoot further.

I don't know Bobcat systems like I do Toyota skidsteer, but on Toyota if the center foot pedal is pressed with no attachment connected, it will kill everything. Could that be happening to yours? Check into friction between your actuators for the attachment fluid drive.

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Hi Joseph:
Usually hydraulic components will "self clear" any air in the system just by trying to cycle through the functions a few times.
Have to ask the question............
Did you remove and replace the hoses one at a time, or did you take them all off at the same time?
The reason I ask is............ Could there be a remote possibility that any of the hose onnection locations were switched?

That's one of the first things that came to mind as I was reading through your post; that the system was air-bound. Are there bleeder valves on the system?

In any event here is a website where you can buy the service manual for your skidsteer; https://mypowermanual.com/shop/bobcat/bobcat-641-642-643-skid-steer-loader-service-manual-download-6566135-10-86/

Bics coil on control valve not unlocking. Broken wire, bad connection or bad coil

Ask here, they will find every Bobcat manual or schematics.

i have a 743 bobcat the hydraulics are noisy and moves very irratic now like its not getting any fluid any ideas