Illivander
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- Mar 5, 2009
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Ok so I filled it with new oil, but im not getting any lift, none, what might be wrong?
Need help with engine hoist, please.
- Thread starter Illivander
- Start date
peter_x
Well-known member
Maybe it has to be bled?
Chris Adams
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What he said.
Have you tried pumping it real fast, just wailing up and down on the lever? I've had leaky rams that doing a couple dozen fast flutters on the lever would bleed, then they would start working.
If you had to add oil, I presume you have a known leak?
Have you tried pumping it real fast, just wailing up and down on the lever? I've had leaky rams that doing a couple dozen fast flutters on the lever would bleed, then they would start working.
If you had to add oil, I presume you have a known leak?
OP
Illivander
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I don't know if there is a leak, what is the proper procedure for bleeding it?
Merkava_4
Banned
I'm just guessing, but the seals in the ram might need replacing. Sort of the same thing happens to master brake cylinders when they no longer pump fluid.
Chris Adams
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Why did you add oil if there was no leak? Is this a new ram? Which would have oil in it. Is this a used ram you picked up? In which case it should have had oil in it.
Oil in a ram or jack should never have to be refilled unless you worked on it or it leaks.
Over filling is bad.
Under filling is bad.
Unlike a brake cylinder on a car, there is usually no bleed screw. I've seen them bled by pumping fast, forcing the air to the top. I've bled them by pulling the fill screw from the jack and using my thumb as a 'bleed screw'. Covering the hole when the lever is pulled down, uncovering when it is pulled up, till I could feel pressure.
On some there is a plug you can cover and uncover as you pump. Rubber, about half way up the jack.
OP
Illivander
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This is an old hoist (not sure how old, but many years) of my fathers, there was no oil in it, seemed that way anyway, I don't know why, and I don't know anything about it really, other then I remember it working several years ago.
Merkava_4
Banned
It's probably leaking internally. Your best bet if you've got the engine unbolted and ready to pull is to swap out the whole hydraulic ram with a new one.
OP
Illivander
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OK well that definetely *****, but thanks guys.
vssjim
ALLIANCE MEMBER
The only way to your bleed the jack is fill it with oil to the bottom of the fill plug and pump it with the release lever open as it would be letting down and then close it and hope it works if not take it apart and get a kit. If its and old US made jack don't replace it with a new chinee jack as they wont last anywhere as long as what it came with. You can get kits from lots of places like Blackhawk jack parts on the web.
Uncle Buck
Banned
Before you ditch that bottle for a new one you need to try filling it with fluid. The fill hole will be halfway up the side of the bottle on the side of the body. With the cylinder in place, bolted to the lift arm, and the arm in the collapsed position, or lowest position, remove the afore mentioned fill plug and fill the cylinder with jack fluid till you can put no more fluid in the bottle.
I think you will want the pressure on/off screw backed off to the counterclockwise position when filling the jack. This screw will be found at the base of the jack, and it is the one you turn clockwise to lift, and counterclockwise to lower the lift arm. Once you have filled the jack to capacity, screw the pressure release screw back clockwise till it is seated and replace the screw or plug you removed from the side of the cylinder body.
Hopefully if all goes well you should find you have a working cherry picker. If you have a massive leak, you will either be replacing the cylinder, or rebuilding it.
bgott
Well-known member
Make sure someone didn't have the ram off and re-install it upside down. The pump assembly has to be on the bottom for it to work.
nissan_crawler
Well-known member
First post...
One thing I've done is to back off the needle valve, and raise/lower the arm by hand to bleed it.
Uncle Buck
Banned
Agreed, I have done that one as well. I admit what I learned has been self taught so the bleeding sequence has for the most part been trying this, that and the other to arrive at the right answer.
My new engine hoist would work intermittently. When it failed it would sound like fluid was leaking back past the control valve. THE PROBLEM-- THE VALVES NEED TO BE FLUSHED.
Lower the boom completely.
Close the control valve.
Manually lift the boom as high as it will go.
Open the control valve - lower boom completely.
Should be fixed...
This solved my problem, Good luck
Lower the boom completely.
Close the control valve.
Manually lift the boom as high as it will go.
Open the control valve - lower boom completely.
Should be fixed...
This solved my problem, Good luck
Troubleshooting info:
Here is a link to the troubleshooting procedure for the hoist. See page 3.
http://www.northerntool.com/images/downloads/manuals/144847.pdf
Here is a link to the troubleshooting procedure for the hoist. See page 3.
http://www.northerntool.com/images/downloads/manuals/144847.pdf
That1Guy
Well-known member
By lifting the boom by hand, you are probably drawing air past the seals and creating a very dangerous situation.
I would never lift the boom by hand - regardless of whether the valve was opened.
Just my opinion.
I would never lift the boom by hand - regardless of whether the valve was opened.
Just my opinion.
Jswain
Well-known member
You would be Thatguy
