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Old 10-27-2014, 06:33 PM   #1
Firemenfred
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slow landing gear

just picked up a use 300MP that has hydraulic landing gear and slides. the slides operate smooth and at a normal speed. the landing gear is slow, operates at a Snell's pace sometime it looks like its not moving. even if i have the genset running or plugged into a power supply. i base this on the operation of my old electric gear. is this normal?
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Old 10-27-2014, 06:54 PM   #2
trueweb
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My 299MP is sloooooow too. Sounds like it's in pain as well.

I would also like to know if there is a trick to making it move a little quicker.
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Old 10-28-2014, 06:53 AM   #3
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I suspect it is normal. They use a small motor with big gearing (like a bicycle in "granny gears" or cog 1, gear 1) because it has to lift such a large weight which sometimes includes the tow vehicle.
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Old 10-28-2014, 08:02 AM   #4
trueweb
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I agree SkiSmuggs, yet the little motor still sounds like it's dying in there.

I wonder if there are any upgrade kits.
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Old 10-28-2014, 08:12 AM   #5
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Smile

Interesting, thought 300 MPs landing gear were all electric drive. What year do you have? Since the majority of time I am moving up and down inches not feet, time it takes has not been an issue. Not speedy by any means, moving it a feet or two would be an issue. Would not expect a difference in speed between Generator or Shore Power since it is 12 VDC.

Having watched a neighbor hank crane his landing gear up and down I am sure anything is faster than that
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Old 10-28-2014, 08:44 AM   #6
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I think (I've been wrong before) that it's more a matter of using a "very small pump" to pressurize hydraulic cylinders. In the slides, the cylinders have smaller, longer chambers and the volume of hydraulic fluid "flows to fill" rather rapidly. On the landing gear, because of the weight being lifted, the hydraulic cylinders are shorter and thicker. They take a significantly larger volume of hydraulic fluid to move the piston the same distance than do the slide cylinders, but they are capable of moving a significantly greater weight.

So, the slides move "kind of quickly" while the landing gear moves much slower because the volume of hydraulic fluid the pump can move into/out of the cylinders is limited.

There's also the possibility that the O-rings in the cylinders are leaking and a part of the hydraulic fluid being pumped into the landing gear hydraulics is actually leaking back and not being used properly???? That's a matter for someone with a bit of hydraulic "expertise" to look at and possibly rebuild the landing gear cylinders....

I've had that occur on farm equipment in the past. Any John Deere or Kubota dealer has the expertise and the equipment to rebuild the cylinders if they will accept the task of working on an RV system.
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Old 10-28-2014, 09:25 AM   #7
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Firemenfred, Have you checked the level of the fluid in the reservoir. Since the landing gear seem to almost be stopping and they need a larger volume of fluid then the slides you may be low on fluid. Just thinking out loud, Hank
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Old 10-28-2014, 10:32 AM   #8
Bushman512000
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Hyd. fluid

With slides In and jacks up check the res is it full? if not fill it up how old is the trailer and what make is the pump?Has any one played with the pump some have a control to adjust the flow some thing to look for also is a kink in the supply line to the jacks .Think of a floor jack a few pumps and a car is picked up. One more thing to check for dirt or plugged line ...I know that would be last on the list but a chunk of rubber line wall can plug as can part of a o-ring
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Old 10-30-2014, 05:08 AM   #9
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The landing gear on my Raptor are driven by one small electric motor, they are not hydraulic like the slides. They are also as slow as a snail. I stripped a gear in one of the legs last year, they make a rebuild kit for it and they also make a conversion kit that adds a motor to the leg so each leg has it's own motor. Still slow however. A friend of mine bought a big forest river and his landing gear are hydraulic and move as quick as the slides move.
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Old 10-30-2014, 01:41 PM   #10
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I agree with JAL. The gear in my 2012 300 mp is electric. My slides however are hydraulic. Two completely and unattached systems. And Yes they move very slow, but pack some mighty torque, it's a trade off..
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