I have a 287B cat that keeps blowing the return hose. Anybody know where to check and what the pressures are
Case drain pressures can be as high as the actual pressures on the system when they are dead headed. Most systems have a bypass valve set at a much lower pressure so the fluid can return to the reservoir. I would suspect a restriction in the system or the volume that is bypassing is way beyond the capacity if the hose.
O.k any idea which port to check from there are a alot of ports
I would pull the service manual and follow the hyd flow charts. A call to CAT may be in order to see if it has been a common issue. CAT skids are not my expertise but their systems are the same as most.
Is it the hose that connects to the pump on the left side and then goes down to the return manifold below the pump? If that's the one there's a pip on replacing it with a better one.
Which case drain line? If you burst a case drain line that is attached to a drive motor, you may have also blown the drive motor seals. Case drains are a return line directly to the hydraulic reservoir with as little pressure as possible. If the pressure was high enough to burst a line, you may have exceeded the motors acceptable case pressure which can blow the seals. If your machine has filter in the case drain line, it could be plugged.
On a bobcat case drain pressure is only 30-50 psi. Pull your case drain filter and make sure it isn't plugged (or just replace it). Maybe put a gauge inline and see what pressure you do have.
The case drain lines flush debris from the drive motor if a motor is failing it can send a fair amount of metal down the drain lines possibly pluging the return system. Some units have a large spin on filter for return oil and some have small filters for each drain line. Even a fitting with a smaller orifice than the hose may have colleccted debris and pluged the line. If you find metal in the lines is the problem I would keep an eye on that motor.