I'm still just learning about these slides... but it sounds to me like you may have a solenoid problem? If it is not moving but the motor sounds like it is loading up, that doesn't sound like low fluid to me.
I have a 2003 Dynasty with HWH slides "The HWH® SpaceMaker®
Dual-Cylinder Rail Hydraulic Room Extension". Mine has a leaking cylinder and have been doing a bunch of research lately to figure out what to do about it.
There's a lot of documentation on the HWH website, but it was hard for me to discern what is relevant.
For my systems I found the following HWH documents to be useful for Monaco having two hydraulic slides and hyd genny slide (without hydraulic leveling): ML25637, ML19241, mr404250, mr412005, ml23567
Start with document mr404250: "OEM Guide Page
HWH SpaceMaker Equipment for MONACO COACH Vehicles", If yours is different from mine, you can use that document to figure out what you have and then you can find relevant documents from there.
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2003 Monaco Dynasty 42 Regal.
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