Changing the Hydrostatic tranny fluid. YT 3600

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Changing the Hydrostatic tranny fluid. YT 3600

cr250
I'm sure someone had this job done right, but  I couldn't find it. So here is how I did it. Looking from the back of the mower, you will see a 6mm allen bolt facing down on the pump, it will be just fwd. of the axel remove this, a spring and a steel ball will come out as well. Drain it, rock the mower to get all the juice out. Install and refill, I used 5w-30, some say to use other, I don't think it really maters. Yes the pump fluid and the differential fluid are separate, use a 80-90 ish gear lube in that. Hope this helps, I'll try posting pics as well.
3-YT3600's, 2-YT 6800's, 1-YT6700 for parts.
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Re: Changing the Hydrostatic tranny fluid. YT 3600

rattosh51
Good tips and great pics cr250!!
Always helps to see the real thing.
Thanks
Rattosh51
YT6800
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Re: Changing the Hydrostatic tranny fluid. YT 3600

big_al
In reply to this post by cr250
hey
i had the problem that i lost one ball i first thought it was again correctly but no movement wehen the engine turns   so i doublechecked it and only the spring came out.


Do you think there was a chance that the ball went in n wrong  hole in the valve body ? OR i lost it on the ground

Do you know the diameter of that ball ? that i can get any replacement ?

thaks a lot
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Re: Changing the Hydrostatic tranny fluid. YT 3600

casscounty
In reply to this post by cr250
     I don't know why the 3600 would be different, but the service manual for my 6800 calls for 10W-30 for the engine, hydro pump, and differential.
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Re: Changing the Hydrostatic tranny fluid. YT 3600

cr250
When I posted this I didn't have a manual, that being said, when I pulled the plug for the rear end it sure looked like an 80-90 gear lube, it wasn't dirty so I didn't change it. Most people don't change there car diff lube, these are much slower, I'm not. I believe 5-30 will be just fine, but do what the manual says. I use mine in the winter as well, plus the new oils are much better than they where 30 years ago. Bottom line, use what it says in the manual. Thanks for the correct info!
3-YT3600's, 2-YT 6800's, 1-YT6700 for parts.
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Re: Changing the Hydrostatic tranny fluid. YT 3600

YamahaGenuineParts.com
The drive oil in all the Yamaha Tractors is just 10w30 and is not require to be changed.
Oil is simply pumped forward and backward in the hydrostatic drive system and does not get burnt.
Changing the oil will require the system to be bled as it the tractor will groan loudly until all the air is worked out of the system, this takes quite some time.
Hope this helps clarify things.

Speedy
www.YamahaGenuineParts.com
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Re: Changing the Hydrostatic tranny fluid. YT 3600

cr250
I respectfully disagree. Everyone I have changed is very dark, after nearly 30 years of operation. Also they must get very hot, why the fan? Just my opinion and observation.
3-YT3600's, 2-YT 6800's, 1-YT6700 for parts.
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Re: Changing the Hydrostatic tranny fluid. YT 3600

rattosh51
Agree cr250!
The sealed "no service" transmission story is just that-a story.
The fan provides cooling and tries to keep dirt and debris off of the hydro unit.
Best thing you can do is make sure the fan is working and the hydro is free of the grass/dirt blanket that keeps heat in.
Rattosh51
YT6800