Hydraulic Cylinder Seal Sizes.

Titan17 · Feb 2, 2019

Does anyone know where to find seal sizes for various hyd. cylinders on our tractors??. Naturally Kubota doesn't give much info for individual seals. You have to buy a complete kit which you don't need. ($90.-150. X 2).

I'd like to get the seals before disassembled so I can put together same day.
Otherwise take seal out, measure, order, wait, reinstall. 1 week at best.

Seals in question is swing cyl head on L39 BH.

D2Cat · Feb 2, 2019

Go to your nearby hydraulic repair shop. You may have to have is dis-assembled for them to itemize the parts, but they will be reasonably priced! It will be worth your trouble and wait.

Last Fall I needed kits for cylinders on a Bobcat. Bobcat wanted $40 for ea. cyl. I got them at the hyd. shop for $11 each.

sagor · Feb 2, 2019

Titan17 said:
Does anyone know where to find seal sizes for various hyd. cylinders on our tractors??. Naturally Kubota doesn't give much info for individual seals. You have to buy a complete kit which you don't need. ($90.-150. X 2).

I'd like to get the seals before disassembled so I can put together same day.
Otherwise take seal out, measure, order, wait, reinstall. 1 week at best.

Seals in question is swing cyl head on L39 BH.

For that $90-$150 x2, you can probably get some hydraulic shop to rebuilt/repack your cylinder and pressure test it for you. Always worth asking around... If any shop says they are not interested, ask them if they know someone who might be, they always know who will do it...

lugbolt · Feb 2, 2019

There are 4 hydraulic shops near us.

The cheapest to rebuild one cylinder is about $175, includes pressure test and repaint if needed. And of those few that they've done, they were not excellent quality.

Rebuild them yourself. They're mostly easy. You'll need some hot water to soften up the plastic seals. Check the tubes for big scratches and check the rams for bend. If they have any visible bend, they will never seal up.

Titan17 · Feb 2, 2019

I was hoping to get info on sizes before I disassembled; I could reassemble immediately. Closest hyd. shop is 1/2 hr away, and a little on the $$ side for parts. I'll bring the seal and match up.
I usually order from Motion Industries or BDI. Mail delivery is always cheaper than gas and drive time.
It's a 40mm rod X 70mm cyl bore (in case anyone knows off hand) cyl head sizes are standard. I'm going to guess seal is a polyurethane u-cup.
I'm not doing the piston just the head so as to fix leak.
Appreciate the advice from everyone. I'll post the size when I do the job in few weeks.
Love these Kubota's but they ROB us on parts!! Maybe because they don't break often.

motionclone · Feb 3, 2019

Titan17 said:
I was hoping to get info on sizes before I disassembled; I could reassemble immediately. Closest hyd. shop is 1/2 hr away, and a little on the $$ side for parts. I'll bring the seal and match up.
I usually order from Motion Industries or BDI. Mail delivery is always cheaper than gas and drive time.
It's a 40mm rod X 70mm cyl bore (in case anyone knows off hand) cyl head sizes are standard. I'm going to guess seal is a polyurethane u-cup.
I'm not doing the piston just the head so as to fix leak.
Appreciate the advice from everyone. I'll post the size when I do the job in few weeks.
Love these Kubota's but they ROB us on parts!! Maybe because they don't break often.

Go to kubota parts store and measure whats in their bag of parts then go home and get online to match the seal size. You already know a couple parameters like rod diameter and cup type.

I recently purchased some seals from Oring store and they work great so far and low cost.

Im no pro, I just resealed a cylinder myself

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Hydraulic Cylinder Seal Sizes.

Titan17

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D2Cat

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sagor

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lugbolt

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Titan17

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motionclone

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