Motorized Vehicles

Standard Control Unit

Spring-Retract Jacks

The two center valves control the front jacks. Slowly open the two center valves. When the weight is off the front jacks, open the two outer valves. When the jacks are fully retracted, the vehicle can be moved. If necessary, pry the jacks up. It is recommended to leave the valves open until the coach has been delivered to the repair site.

This type of hydraulic control unit has a shuttle valve. If none of the jacks will retract after the valves have been opened manually, there is most likely a shuttle valve problem. Click here, MI158813, for a detailed explanation and diagram to retract jacks if there is a shuttle valve issue.

If a jack will not retract no matter what is tried, the cylinder may have to be removed. The vehicle may have to be lifted to remove a cylinder. It may be possible due to a hose issue, the jack will retract when the hose is removed.

Motorized Vehicles

With Two Solenoid Valves for each Jack

With or Without Auxiliary Hand Pump

These control units have a manifold that is labeled with the valve location for each jack or function and which is the extend or retract valve. Slowly open the appropriate valves to retract the two front jacks.

Although the power retract style jack will have to be pried up if the system does not have an auxiliary hand pump, the vehicle will still lower when the valve is opened until weight is off the jack. When the weight is off the front jacks, the valves for the rear jacks can be opened.

If the control unit is equipped with an auxiliary hand pump, click here MP349904 for detailed instructions on the use of the hand pump. For power retract jacks, when the weight is off the jacks, it may be easier to use the hand pump to retract one jack at a time. If the hand pump will not function it may need to be primed, click here MP440009 for detailed priming instructions. If the hand pump still does not function, the jack(s) will have to be pried up or removed. It is recommended to leave the valves open until the coach has been delivered to the repair site. .

If a jack will not retract no matter what is tried, the cylinder may have to be removed. The vehicle may have to be lifted to remove a cylinder. It may be possible due to a hose issue, a jack will retract when the hose is removed.