Hydraulic lift system Hydraulic, mechanical and electrical components of the lift system
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Old 05-21-2014, 07:33 PM   #1
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Question 1979 Will Not Lower

I just bought a 17' 1979 HiLo, new battery, replaced a burnt fuse, the unit will raise not problem, but it will not lower. Pull the release cable and push the toggle switch to the downward position, Nothing. The hydraulic pump does not run & the unit will not lower. Could the toggle switch be the problem? According to the owners manual, you could release the fluid with a crank, there isn't a crank on the hydraulic motor. Please help if anyone has the answer.
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Old 05-21-2014, 09:25 PM   #2
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I believe there is a selenoid that works the valve to release the hydraulic pressure to let it lower. Someone will be along with a more specific answer but in the meantime search the forum for "lowering " or "will not lower" etc. You should find an answer or some suggestions.

Rick
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Old 05-22-2014, 09:04 AM   #3
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Try raising the top a little before pulling the release cable, that takes weight off the release. The motor does not run when lowering, there is a solenoid that releases the hydraulic fluid back to the reservoir. It should make a click when the down switch is toggled. There is no crank for lowering but there should be a valve, like on a bottle jack, that can be opened to lower the top manually. Look for the valve on the front of the pump.
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Old 10-25-2014, 11:14 PM   #4
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Default won't lower

We had the same problem. Went through all troubleshooting. Replaced selunoid. Found that the bolt through the negative battery cable on the bottom of the motor was corroded, after cleaning and putting back together all works great.
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Old 10-26-2014, 03:14 PM   #5
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My hi-lo is an old one also and it does not have a valve to release the pressure.

RichR has the answer you need.
Raise the unit to hear the squeal, AND pull the safety bar release at the same time, and reverse the switch, to lowering sequence.

hth

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Old 11-22-2017, 11:48 AM   #6
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I have a 1994 HILO. It will not lower.It lowered and raised and I raised it but now it will not lower and when I pull the release cable it sounds like it is releasing but when I push the down button it seems to be dead it clicks but that's all .I have a small handle lever on the pump I believe it is the manual release handle. My question is do I need two people to do this, one to pull the cord and one to use the lever?.I know it is not the battery all my lights work. It shows the release handle in the manual but not what to do. Help!!
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Old 11-22-2017, 12:10 PM   #7
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Faye, welcome! Did you try the process renoites describes in the post above yours? I suspect the top might be resting on the safety bar.

- Jack
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Old 11-22-2017, 04:45 PM   #8
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Jack,
I did try the trash removal using cable and up then down.
When I pull the cable it is not hard to pull it is very easy to pull is that normal, also I got under my RV and could very easily wiggle and lift the release bar is that normal. all the pulleys look good the cable does not seem to be frayed and is tight. It also states in the manual that if the hydraulic fluid is low it will not let the top go down have you or anyone ran in to that before. Any help or suggestions will be greatly appreciated.

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Old 11-23-2017, 10:06 AM   #9
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It does take 2 people to lower the top with the manual lever. One to pull the safety bar release cable and one to move the manual lowering lever. Try this and get back with us if it still does not lower.
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Old 11-23-2017, 10:41 AM   #10
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Faye - it just occurred to me that you MAY have the Master Switch (a 3-position switch next to the Raise/Lower switch) in the "Interior" "Neutral" position. This is a fairly common new owner mistake. If the interior lights are working, flip that switch to the other extreme and the top should go down.

Another possibility, of course, is a wiring fault in the raise/lower circuit. I had a mouse chew through one of the interior wires in my trailer before i mouseproofed it. Do you have mousies?

I just don't see the lift motor or hydraulic system being at fault, since things seemed to work fine up until now. I don't think those systems suddenly fail. But, the electrical circuits to them can go bad.

- Jack
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