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Hoist malfunction ??? My F-600

olgentdc

olgentdc

Well-known Member
Location
Harrison County , Elizabeth Ind 47117
The hoist is spraying oil out the fill breather when lowered ,,. I pour
oil in to raise ,,. and when lowered it sprays most of it all over the
undercarriage ,,. Good way to control Salt Rust TRUE ,,. I suppose a
valve is stuck somewhere ... Not sure where to look ,,. And I know too many
Guys that were killed by these things ,..
 
(quoted from post at 10:48:02 10/27/23) The hoist is spraying oil out the fill breather when lowered ,,. I pour
oil in to raise ,,. and when lowered it sprays most of it all over the
undercarriage ,,. Good way to control Salt Rust TRUE ,,. I suppose a
valve is stuck somewhere ... Not sure where to look ,,. And I know too many
Guys that were killed by these things ,..
Click to expand...

Is this a hoist where the cylinder is the reservoir? If so, some will spray oil out the breather if you overfill them, which is easy to do if you are filling it with the body raised. If the body is going fully up, don't add oil even if you don't see it in the reservoir. If it is not going fully up, add oil slowly until it does then add just a bit more, maybe a couple quarts. My dump truck hoist cylinder/reservoir will spray the excess out the breather if overfilled.
 
I know of one case where the hoist was overfilled with the bed raised. Then, when the bed was let down, it blew the seals out of the hoist. Solution was to leave the fill plug out the first time the bed was let down, so the excess fluid could overflow out, then raise the bed again and put the plug back in.
 

It possible you have air in the cylinder. The hydraulics will compress the air to lift the bed. Then when you let it down that air will escape violently blowing oil out of the tank even though you did not have too much oil in it. Then when you try to lift again, you will suck some air/oil as the level gets low. Then you add oil and push more air from the system into the cylinder. Then you add a little more oil to the tank, and the same thing happen when you lower it again.

Lift the bed 1/2 way and lower it a few times to be sure you have cleared all the air. Then raise it 1/2 way, add some oil, til you get it all the way up. Then let it down slow, see if that works.

Also, be sure your tank does not have a big dent in it that would decrease the capacity.
 
If I understand this correctly it sound like oil is leaking by the piston in the cylinder. I simply ran a hose from the vent hole to the reservoir to recapture the oil leaking by the piston.
 
Is this a new to you truck? Some are 2 way systems where pto needs to be operating to transfer oil to the other side of cylinder.
 
how much oil u adding? adding to much and that will be normal thing for it to do. tank must have correct oil level with the hoist down , so the cylinder pistons are retracted. when hoist is raised the oil in tank will be at the lower level. and when down most tanks are only 3/4 full anyhow. i do know that on lots of hoists u need to add oil when the hoist is up , but block the hoist securely while adding oil. so if its down and its finished its spraying and the tank is full suck more oil out and leave it alone. unless u have a leak.
 
Another possibility, some hoists using the cylinder as reservoir are 2 way cylinders, pump must be kept running when lowering to pump oil to back side of piston. yes you can gravity lower but it will blow oil out of breather as oil can not flow fast enough thru non running pump to required location.
 
Most likely it is over full. If this has just the hoist with no main frame included with the hoist just fill till the hoist will fully extend and a wee bit more and you are good of course if it is a blown hose or they don't look good now is the time to change them out.
 
I agree with cool hand- the seals in the cylinder are leaking past to the vent side. You can't plug the vent. Mark.
 
Once olgentdc responses with the answer to whether we are dealing with a hoist cylinder that doubles as a reservoir or a separate reservoir, things may be clearer. If it is the cylinder doubling as a reservoir, they will blow oil out the filler/vent opening if they are over filled. The reservoir section is the rod side of the piston and will not hold as much oil as piston end without the rod running through it. When the valve is shifted to lower the body, the return oil is sent to the rod end of the cylinder. It is not uncommon for someone not realizing this to dump oil in the fill opening as the body is going up, if it is not fully raising. Then continuing to add more than maybe a gallon of oil beyond what is needed to extend the ram fully, it will blow out when the body is lowered. And if it has air in the oil from being low, it can blow even more out. From having seen this a number of times, I think this is the issue based on what he has posted so far.
 
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