Troubleshooting hydraulic slide outs (RV content)

My folks have a 2007 Montana 34RL with 4 hydraulic slide outs. Yesterday, they came home from a trip and I was helping my pop back the monster in. He got a little close to the neighbor's fence but thought the slideouts would have enough room. One of the slideouts hit a fence post at about 99.5% extended. Now the motor will not run. It has a big relay on top of the motor that clicks when he hits the switch but the pump motor will not run. I've checked all the fuses and they are good. The 5th wheel is plugged into shore power so I know it has good 12 volt power.

So, with the motor not running, I tried to manually run the pump motor. It has a 1/4" hex key socket in the end. I used a cordless drill to spin the pump motor until the battery died. Then I used a corded drill. The slide outs did not move. 

Now, I have no idea what we are going to do. My dad can't move the 5th wheel with the slide outs extended because the fence is too close.

I'm thinking a hose might of burst when he was relocating the neighbor's fence but all the hoses/wiring is up in the frame and it's covered by insulation and a waterproof membrane (Arctic Insulation Package), so troubleshooting it is going to be a massive PITA.

Also, why won't the pump motor run? Thermal protection breaker or something? Did we fry the relay?

Help!

Is it possible that when the slide contacted the obstruction it caused the motor to draw enough amperage to blow it's fuse?  What brand is the slide mechanism?

In reply to wae :

Its a Lippert system.

I was thinking maybe the relay/solenoid mounted on the motor housing might have a thermal fuse or circuit breaker but I couldn't find anything.

The relay makes a "clunk" when the switch is pressed (both on extend and retract) but the motor never even tries to move.

Its a really simple system and its stumping me. My dad is about to burn it to the ground haha.

If all the fuses are good (and I could see the relay actuator on one circuit with the power side that goes to the motor being on a second), is there a locking switch on the motor?  Some of those have a little thing to lock the motor for manual actuation of the slide although I thought that would just freewheel the motor, not prevent it from moving at all.  

Control board?

A secondary manual safety that prevents "push in" since the unit was almost fully deployed. That or as mentioned above some form of thermal limiter.

Paul B

Any kind of limit switches? Maybe the slide out is slightly  tweaked and one switch is making but the other isn't so the motor won't pump because it "sees" something jammed? No experience with campers just a wild guess.

Did you see this video on the Keystone website?

The factory documentation sucks. I can't find any mention of a limit switch. As far as I can tell, the rocker switch goes to the relay and the relay is wired right to the motor. I don't think the electrical part of this system is complex enough to have a limit switch but I could be wrong.

The motor/pump/reservoir looks just like this:

The top middle and front terminals are wired to the battery. The small spade terminals are wired to the switch. I know the solenoid is getting power because I can hear it click when the switch is pressed.

Slideouts are really nice til they aren't. If the electrics check out, get a tape measure and see if the slide is extended farther on one side than the other. Push on the side that sticks out. Other than that I got nuthin. 

Have you load tested the ground? Maybe the bolt/nut got knocked loose, enough to start working but fails under load.

did you try swapping the relay with one from one of the other three still working sliders? That would be my first move. Second would be the motor, or at least bench testing the dead motor when not hooked up the the hyd pump. see how it acts without a load.

Also, isn't there a way to manually extend / retract the sliders? Some allow you to use a drill to override the electrical motor and run the pump.

Your batteries are fully charged, correct? 

No experience with this particular company, but I've found that many RV system component suppliers are super-helpful on the phone.  One of the real workers (engineers or mechanics) will come out of the back to talk on the phone and give solid troubleshooting advice.