[OzMonties]

Hi all, there is a good reason why it isn’t recommended using the hydraulic levelling system as a hoisting system for changing a wheel etc.
A hydraulic cylinder fitted to an excavator or even an elevated work platform, anything designed to lift and support a certain load, generally has what is called a pilot check valve fitted directly on Each cylinder. This valve prevents the release of fluid from the cylinder, which may be holding a load, should a hydraulic line or hose be damaged.
On Lipperts levelling systems for example, there is only a Single pilot check valve and it is located in the pump assembly housing.
So if you blow a hydraulic line while you’re coach is suspended with a wheel or wheels removed, the results could be very bad.
The other thing that could happen is hydraulic oil bypassing the piston seals from the high to low pressure side of the levelling jack.
The chances of these things happening are remote but possible.