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Operators, when it comes to hydraulics, the M9 armored combat earthmover (ACE) is known for being very temperamental, especially when dealing with hard-packed dirt.
Experienced operators have a rule of thumb: They take a break and shut down every two hours during operations. During that break, they check for problems, especially hydraulic ones.
To make hydraulic checks easier at the worksite, leave the earthmover's ejector out about two feet. With the ejector forward, there's enough room to look behind it for a busted compensation pump or leak in the valve bank.
Hydraulic Fluid Level
Before you check the oil level in your vehicle's hydraulic reservoir tank, make sure the ACE is in SPRUNG mode with the engine off, ejector retracted (back), apron down and hydraulic pressure relieved.
Why retract the ejector? The oil that's used to extend the cylinder inside the bowl isn't in the hydraulic reservoir tank to be measured. It's in the cylinder doing its job. So if you measure the fluid level with the ejector extended, the hydraulic oil level appears low.