RV Leveling Jacks That Will Not Retract

A leveling jack stuck down is one of the more frustrating RV failures because the rig is otherwise perfectly fine. It just cannot move.

Most of these come down to a short list, and most rigs have a manual override that nobody has read about until the moment they need it.

Find the manual override first

Hydraulic systems generally have manual release valves that let the jacks retract under their own weight or with a hand pump. Electric systems usually have a way to drive the motor manually or a mechanical release.

Where those are and how they work is in the manual, and reading it in a campground with a stuck jack is worse than reading it in the driveway. Find it before you need it.

Power problems come first

Leveling systems draw hard, and a weak or dead house battery is the most common cause of a system that will not operate. The pump groans or clicks and nothing moves.

Check battery voltage and connections before assuming the system failed. Corroded battery terminals produce exactly this symptom, and a rig that has been sitting frequently has both a low battery and corroded terminals.

Hydraulic systems

• Low fluid in the reservoir, which is both a symptom and a cause
• A leak at a cylinder, a hose or a fitting, visible as fluid on the jack or the ground
• A failing pump or pump motor
• A stuck solenoid valve, which is a common failure and a relatively small part
• Air in the system after a fluid loss
• A bent or damaged jack that binds mechanically

Fluid on the ground under a jack is the easiest diagnosis on this list. Everything else takes a bit of looking.

Electric systems

Electric jacks fail at the motor, the gearbox, the control board or the wiring. Corrosion at connectors is common because those connections live under the rig.

A jack that hums and does not move is usually a motor or gearbox problem. A jack that does nothing at all is usually power or the controller.

Controls and sensors

Auto-leveling systems use sensors to determine attitude, and a failed sensor or a lost calibration can put the system into a state where it refuses to operate. Many have a reset or recalibration procedure, and it is worth knowing whether yours does.

Never crawl under a rig supported only by leveling jacks. They are levelers, not stands. If you have to be under it, blocks and stands go in first.

The mechanical causes

A jack that has been driven on, backed into something, or run down onto uneven ground can bend. A bent jack binds in its housing and no amount of hydraulic pressure retracts it cleanly.

Rust and corrosion on the ram is the other one. A jack that has sat extended for months in a humid coastal climate can seize.

Preventing it

• Retract the jacks fully when the rig is stored rather than leaving them down
• Keep the rams clean and protected
• Check hydraulic fluid level periodically
• Keep the house battery charged, particularly during storage
• Use pads under the jacks on soft ground so they do not sink or load unevenly
• Operate the system periodically rather than letting it sit unused for a year

That last one matters more than people expect. Systems that sit seize. Systems that get exercised keep working.

Getting home with a stuck jack

If a jack will not retract and there is no manual override that works, the rig is not moving on its own. Driving with a jack down damages the jack, the mount and whatever it drags across.

That is a call rather than a decision to try it and see.

Slide-outs share the same failure list

Slide-out mechanisms fail for most of the same reasons — power, motors, hydraulics, controllers, and mechanical binding. A slide that will not retract is the same category of problem as a jack that will not, and the same manual override principle applies. Know where yours is.

If you have a jack down and a rig that cannot move, call (850) 495-0366. Dispatch is answered 24 hours a day and James will come to wherever the rig is parked in the panhandle.