Doesn't Hi-Lo use a hydraulic system? First thing to do is to check the pump and fluid levels. Do you see any spots where fluid has leaked. It is usually transmission fluid that is used.
Next is the pump running? And making pressure? Yo should have a book on the hydraulic system which will describe how to test and bypass the pump.
Ken
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Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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