I have been banging my head against the wall trying to figure out what would be causing this new issue. When using my 873 if I bottom out the hydraulics in any direction and hold it it will stall the motor. It also stalls the motor if pushing dirt or essentially putting any kind of hydraulic load whether it be the bucket or basic operation, hard turning, digging, etc. It seems like the pressure relief valve is stuck? Is this a likely issue or am I missing something? Machine runs perfect, fuel filter and air filter have been changed. Runs strong and operates fine if not putting any kind of load, such as driving and operating the bucket at the same time. First time post to the forum, but have learned alot from other posts. Any help would be greatly appreciated.