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Folks, we resolved the problem. We did get a pressure gauge and started by testing the output of the pump. To our surprise, it read zero, which immediately knew could not be correct. So we started working backward from the tank. We topped off the hydraulic fluid tank and then worked out all...

@Jbulach , thank you for the question. We did not take apart the piston itself. We will do that today along with taking pressure measurements. Thank you -Rolf

@Mullaney, I'll pick up a hydraulic pressure gauge today ( good to have, regardless ). We'll check the pressure at the output of the pump to start and then make our way through the system ( basically a voltmeter for hydraulics ). Thank you for your suggestions and information.

@Mullaney, here is what we saw. It appears that spring for the plunger is not broken, the plunger is not slides easily, and the spring with the 'plunger' is working also. No clear signs of what could be an issue. We are now left to consider the pump the culprit, though it appears all...

@Mullaney , thank you. We suspected the same after looking at some diagrams of the control valve. We are about to tear it apart to see. I did find a replacement cartridge for the pump, just in case, for $275, which is much less expensive than a whole unit. -Rolf

Thanks. The PTO is turning the pump properly. As for the pressure relief valve, where is that located? Is that part of the pump itself? -Rolf

Folks, thank you for the diagnosis guidance. We have settled on replacing the pump. The control valve works and redirects ( we can tell by locking and unlocking the dump body latch cylinder ). In addition, there are no leaks on or around each of the cylinders; they are dry. When we lift...

We use a 1992 M929 A2 every day while working on a remote road project. The dumping mechanism has worked well for the last three years we have used the beast. Just last week, all of a sudden, the dump bed stopped lifting. The PTO engages, the retention latch moves aside, but it will not...

Thank you for providing some clarity and background on this behavior. I will keep the truck in low when moving around the property in the future, as we have steep roads, often with 7-10 yards of gravel in the back. As for low AND reverse, the previous owner of the truck was wise enough to...

Thank you for the confirmation on the 'normalcy' of this behavior.

Folks, I am hoping that the community can provide insight around an ongoing concern that I have for my vehicle. When I accelerate forward, especially on a hill, the truck takes forever to accelerate. I notice that the engine needs to exceed 1,500 RPM before it even begins to move ( very...