L3400 Hydro Leak found, advice on fixing

   / L3400 Hydro Leak found, advice on fixing #1  

vulcancowboy

Gold Member
Joined
Dec 3, 2010
Messages
409
Location
Duncannon, Pennsylvania
Tractor
Kubota L3400 HST
So, I think I finally found the source of my hydro leak. Initially thought it was coming from the vent under the seat, but upon further exploration it appears to be coming from the joint where the hydraulic case cover is bolted onto the transmission (see breakdown).
L3400.jpg
My question is what type of sealant should I use to seal this connection? Something like Kubota: Acid-Free Grey Silicone Gasket, Part # 07935-60074? Kind of expensive at $44 per tube, but if that is the best choice, I'll spring for it.

Any advice/recommendations appreciated!
 
   / L3400 Hydro Leak found, advice on fixing #2  
When I first got my L3400 HST, 2005, the dealer replaced the 3 pt valve with one that does not jerk. They sealed it with the grey silicone stuff and it is still fine.
 
   / L3400 Hydro Leak found, advice on fixing #3  
When I first got my L3400 HST, 2005, the dealer replaced the 3 pt valve with one that does not jerk. They sealed it with the grey silicone stuff and it is still fine.
Ditto, with everything he said. ^^^
 
   / L3400 Hydro Leak found, advice on fixing
  • Thread Starter
#4  
When I first got my L3400 HST, 2005, the dealer replaced the 3 pt valve with one that does not jerk. They sealed it with the grey silicone stuff and it is still fine.

Would the Permatex Ultra Grey work, or should I get the Kubota product?
 
   / L3400 Hydro Leak found, advice on fixing #5  
I don't know enough to answer that. If it was me I'd use the Kubota product. Maybe someone smarter about this will answer.
 
   / L3400 Hydro Leak found, advice on fixing #6  
Use the Kubota stuff.

The Kubota product is Three Bond TB1200GAU3Z

ThreeBond - Silicone Gasket | eBay

WPS has it in their catalog also.

Works good used it when I replaced the brake case on the L3130 and by the time I got everything torqued down filled with oil and no problems on cure time.

David
 

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