bobcat Hydraulic Cylinder Repair 2 

CAT approves JB weld to fill scratches in chrome shaft . Must be sanded with 1000 grit. Done this on many machines still working.

I recently replaced the seals on the left lift boom. I got the seals from the local bobcat dealer. Around $30 for the kit but it contained every seal. The yellow washers/rings are the seals that take the main force of the lift. They have a rubber oring under them. You have to cut them to get them out and put in the new ones. The kit from bobcat has every seal and a new end nut with blue thread locker. When the yellow washers/rings go bad the bucket may begin to sag/tilt on its own under weight.

Best two videos I have found so far!

Thanks for taking the time to make the video, had no idea what the insides of a hydraulic cylinder looked like.

Thank you... this is great DYI...I will review a few times before repairing my 642. Well done dude!

This video was AWESOME ........did exactly the same thing and got it done .......GOOD JOB BRO ! : )

Nice video. I like that you represent most of the doit your selfers out there and what they will face when trying to accomplish the task.

Thanks for the video, I forgot which side of the o ring the plastic washer went on, so this really helped me out. I read that it helps to let the o rings sit in some hot water so the are more flexible, seemed to help me.

Thanks for the video you just saved me a lot of money next time I need to reseal one of my hydraulic cylinders by watching your video. I just got charged $230 to reseal one hydraulic cylinder at the hydraulic shop!

Good video...I have to change mine now and this really helps me..

Thanks, this makes things look easy!

Hello, that is a great video, seriouslly, thank you so much for all the information 123guiness because you invest time teaching us your knowledge and that is priceless. I will take the dare to say the the thing that is in front of the piston, the one that goes into the head, is a Stop-tube. This is useful because it absorbs the radial forces that pushes the rod to a non-linear side and avoid the rod and the piston to damage the cylinder caused by friction. Basically, the Stop-tube, mantains the rod and cylinder in linear state when the rod is completely out of the cylinder. In industrial hydraulics, I do not know in mobil hydraulics, it is recommended to use a Stop-tube when the stroke is 40 inches or more when it is in a horizontal position, the large of the Stop-tube is 1 inch for every 10 inches or fraction larger than 40 inches. It also depends of the position and if the cylinder is using a trunnion in the head or a clevis in the back side when the cylinder can be placed in a range of 0 to 90 degrees. (when it is the clevis in the back side, the distance for the stop-tube has to be counted with the cylinder distance since the mounting bolt plus the stroke of the rod. And when is a head trunnion, it counts since its bolt plus the complete stroke of the rod). An example of the application is using a large cylinder for opening and closing the doors of a industrial oven. I enjoy whatching your videos, they are great! Thank you so much.

the washer behind that cylinder oring is called an anti extrusion ring....otherwise is it didnt have it, the o-ring would be almost forced into whatever gap is there..all high pressure cylinders have this

Excelente información !!!

Thanks,I now I know what ill be getting into. and saving $$$$.

@enginemodify Thanks for the tip.

Thank you for this man much appreciated

where you get the seals I need some for the stabilizer of 907 backhoe attachment

Thanks!

Great job....

Good funny educational Glad I Hung out

you should soak the seals for a bit , lube up the inner one as well

such a useful video that i watched the advert, thanks

There's a 'nic' in the rod seal @ 1:15 is you're cyl still leaking?

Honestly I didn't have a problem with the 0 ring. That inner seal was a little difficult, but pinching it with the needle nose made it a lot easier.

It was freezing outside. That was my torpedo heater.

Good video thanks

Appearantly, who ever took that cylinder head apart in the past, never heard of a spanner wrench. $20 is a small price to pay to avoid ruining the aluminum cylinder heads.

Had someone do this repair on my bobcat t300 now my bucket tilts downward slowly...what can be the issue?

How do you get an end cap off that will not budge? I first tried the correct wrench. No luck so next I tried a pipe wrench with a long pipe. No luck. Next I heated it and still it will not move. Left handed threads? Did someone epoxy in on?I am sure am puzzled?

also the seals shouldnt go on dry. use some grease

Question, how did this hold up? I have some nasty looking scoring on the tilt piston. Had a piston seal on it and three groves with no o rings in them at all. Just wondering if i debur the piston and try and clean it up if it will work for me. Thanks.

What was the part number for the seals

It will fill soon as you push the pedal and it will work the air out after few passes I broke cylinder and blew lines just put it back to together I never cracked one open but will tomorrow

Helpful vid , noisy heater

great

Hu ho! Not the dude in the Saturn rocket?

Something like STP is good for assembly

Lmao @ 7:52 I’m sitting here staring at mine that I have yet to disassemble thinking man, that must be a different design, I wonder how that’s gonna work. Then you realized! That was great! Good videos though! Helping me out!

good

very annoying noise... what the hell is that?

Well thats how not to carry out a correct repair on your cylinder. I find it unfortunate that there are vidios like this that try to make out that if you own a $100 tool kit then you can fix anything. hydraulic cylinder repair may seem easy to do and you may think that you can save a few dollers doing it yourself but its false economy. Take it to someone who is trained to fix these things and get it done properly. if its not done correctly then you will possibly damage more expensive components,