How to remove hydraulic cylinder

BrianRBM · Sep 27, 2022

I'm trying to replace the cross-over hoses on the steering cylinders for my MF 80 backhoe. The first hose wasn't too bad but I can't get the fitting loose
on the second hose. The repair manual says it may be easier if the cylinders are removed. Yeah, but they don't tell me how. In the pic you can see the nut
(which I removed) but there is a threaded bolt-like pin with a slot in the head. Tried large screw driver...couldn't budge it. I tried pounding lightly
but don't think that would be it. Has anyone ever removed these cylinders from the front axel? I need some advice on this as the other end of the cylinder
is no picnic either. Thanks.

caterpillar guy · Sep 27, 2022

Looks like if you loosen the nut at the fitting you could turn the fitting to get to the inside line. One of the places where a crowfoot wrench shines as you can use an extension and ratchet or breaker bar to loosen them along the same line as the hose runs.

BrianRBM · Sep 27, 2022

I replaced the first hose and took it off to get to the one behind it. I could get one hose end loose but the right side is apparently rusted in. Been spraying penetrating fluids but its not moving yet. They are more difficult to replace then it looks.

matthies · Sep 27, 2022

On removing the cylinder, loosen the nut a few turms then get your favorite hammer 2-3 lb, then hit on the curve of the arm in line with both nuts. A few good hits and the cylinder will fall. And you won't ruin the boot. like guys do with forks. Was taught this by local repair shop over thirty years ago and keep showing/telling guys how to do it. never ruined a boot in my life.

moresmoke · Sep 27, 2022

Hit here with your favorite BFH.

Steve@Advance · Sep 27, 2022

It's like a tie rod end, tapered.

The slot is to hold the stud from turning when tightening or removing the nut once the taper is broken loose.

Take the nut off to clean up the threads and make sure it turns freely before breaking the taper. Then start it back on to protect the threads and keep the cylinder from falling when the taper breaks.

Pry down on the cylinder rod while hitting the end of the spindle arm, it will pop loose.

rustred · Sep 27, 2022

i really dont see what all the fuss is about. not that hard to remove a cylinder. just takes an impact and a big hammer.

BarnyardEngineering · Sep 28, 2022

(quoted from post at 20:56:26 09/27/22) i really dont see what all the fuss is about. not that hard to remove a cylinder. just takes an impact and a big hammer.

It is that hard if you don't know how it's put together, and you don't want to destroy anything.

Most people have experience with hydraulic cylinders that are fastened with a clevis and a pin. Take the clip off the pin, slide the pin out, remove the cylinder. Easy. This is not so obvious.

It could be threaded into the steering arm, could be a tapered fit, could even be straight. Can't tell by looking.

Just lacking that one tiny crucial piece of information that turns it from an messy struggle to a relatively easy job.

BrianRBM · Sep 28, 2022

That's exactly right. Its embarassing sometimes to ask but these jobs can become nightmares if you start doing things the wrong way. Better to ask and find
out how it is put together. I always think that somebody must have done this before. And I'm very appreciative of the guys on this site that provide the
expertise. I've taken lots of cylinders off but none like this.

How to remove hydraulic cylinder

BrianRBM

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caterpillar guy

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BrianRBM

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matthies

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moresmoke

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Steve@Advance

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rustred

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BarnyardEngineering

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BrianRBM

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