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John Deere 490 travel motor brake seals

J

Johndeerekid

Member
Joined
May 13, 2026
Messages
6
Location
Whitby ontario
My machine is filling the left final drive with hydraulic oil. It drives totally fine so I am suspecting that it’s the brake seals/orings. From the John Deere break down it looks the main orings I need are part #TH100494 but they are not available. Any help finding the seals is much appreciated the old machine doesn’t want to give up and be a shame a couple orings takes it down
 
J

Johndeerekid

Member
Joined
May 13, 2026
Messages
6
Location
Whitby ontario
That definitely looks promising, does anyone happen to know the dimensions
Of the seals before I tear it apart? I always rather have the parts before hand but if I have to I will take it apart and measure them up
 
D

Diesel Dave

Senior Member
Joined
Sep 29, 2022
Messages
2,720
Location
Ontario Canada
Welcome to HEF Johndeerekid :cool: .
See 2 screenshots below. The propel motor mounting oring and brake piston seal kit is # AT130924 . The kit subs to 3 part #’s shown in second screenshot. I believe all the o-ring part #’s are available.
***Edit , you also need o-ring #17 in parts list , part # CH17167 ***

1778705736502.jpeg

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1778705872603.jpeg
 
Last edited:
Tones

Tones

Senior Member
Joined
Mar 15, 2009
Messages
4,213
Location
Ubique
Occupation
Ex land clearing contractor, part-time retired
I don't think your problem is with the break. A worn motor increases the casedrain pressure and pops the output shaft seal which then fills the planetary drive.
I recommend further investigation like a casedrain flow test before pulling it apart or you'll be fixing what ain't broke.
 
J

Johndeerekid

Member
Joined
May 13, 2026
Messages
6
Location
Whitby ontario
If you look at the break down I just don’t understand how the shaft seal can leak around the brake housing. It looks like if the shaft seal was to leak it could only leak into the brake housing and then only fill the final drive if the brake housing is leaking
 
J

Johndeerekid

Member
Joined
May 13, 2026
Messages
6
Location
Whitby ontario
The machine also drive no problem like it doesn’t lack any power on that track and if the seal was gone and lots of case pressure wouldn’t it be noticeable loss of drive power?
 
Tones

Tones

Senior Member
Joined
Mar 15, 2009
Messages
4,213
Location
Ubique
Occupation
Ex land clearing contractor, part-time retired
Not necessarily, considering the age of the machine both motors could be worn,one more than the other.
Thats why testing is cheaper than guessing. At the end of the day it's your machine and dough and I'm only passing on what I learnt the hard way.
 
J

Johndeerekid

Member
Joined
May 13, 2026
Messages
6
Location
Whitby ontario
It just seems like the brake piston would block oil from the shaft seal, so if the case drain pressure was high it wouldn’t matter if the brake seals were fine and the brake pressure is higher then the case drain
 
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