D722 Gear case o-rings

Nwood

New member

Equipment
Kubota D722
Jun 9, 2026
6
1
3
Australia
Hi, Rebuilt a D722 engine and in the videos I've watched and the manuals say there should be 3 o-rings in the gear case but mine was flush and not recessed for o-rings so I left them out but now I have an oil leak in that area. Does anyone have any experience with this?
 

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North Idaho Wolfman

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Staff member
Lifetime Member

Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
35,684
10,767
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Sandpoint, ID
Well the picture you posted is an aftermarket cover and they are know for not doing things correctly.

If you have a stock cover that is flat then you used the wrong gasket, as there are several.
 

Nwood

New member

Equipment
Kubota D722
Jun 9, 2026
6
1
3
Australia
Well the picture you posted is an aftermarket cover and they are know for not doing things correctly.

If you have a stock cover that is flat then you used the wrong gasket, as there are several.
Definitely a stock old cover that is flat. I’ll have to call Kubota today and order the correct gasket then because I only used the one that came with the rebuild kit.
Well the picture you posted is an aftermarket cover and they are know for not doing things correctly.

If you have a stock cover that is flat then you used the wrong gasket, as there are several.
 

North Idaho Wolfman

Moderator
Staff member
Lifetime Member

Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
35,684
10,767
113
Sandpoint, ID
Do you know where did the D722 originally come from?
In other words what was it's original use?

Ag engines are different than Industrial engines?
 

Nwood

New member

Equipment
Kubota D722
Jun 9, 2026
6
1
3
Australia
Let me see if i can look intto which version they used and see if I can gain any insight.

Did you use RTV along with the gasket?
After talking to kubota the paper gasket supplied with the rebuild kit is definitely not correct so I've ordered the correct one using the serial number.
Thank you for your help.
 

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North Idaho Wolfman

Moderator
Staff member
Lifetime Member

Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
35,684
10,767
113
Sandpoint, ID
After talking to kubota the paper gasket supplied with the rebuild kit is definitely not correct so I've ordered the correct one using the serial number.
Thank you for your help.
Glad you got a solid answer, I had not gotten to looking it up yet.