Garden Tractor Forums banner

1 - 8 of 8 Posts

·
Registered
Joined
·
156 Posts
Discussion Starter · #1 ·
I have an 1886-01 with hydrostatic transmission. Everything works great on it, engine, hydraulics, & mower. Thing runs like a scalded dog. Only problem it has is an initial hesitation with the transmission. It's like it needs to warm up before it wants to run. It kind of jerks forward and in reverse also. Then when it goes, it really goes. Anyone have any idea why? Oh, the fluid was changed when I got the tractor, along with the filter and I keep the fluid level up where it should be.
 

·
Senior Member
Joined
·
4,471 Posts
Several things.

Charge pump losing it prime due to air leak on suction side.

Low charge pump pressure. Usually around 100 PSI on Sundstrand.

Dirty filter.

Try letting it run a minute or two before moving it and see what happens. This could give us an idea of what might be going on here.
 

·
Registered
Joined
·
156 Posts
Discussion Starter · #6 ·
Several things.

Charge pump losing it prime due to air leak on suction side.

Low charge pump pressure. Usually around 100 PSI on Sundstrand.

Dirty filter.

Try letting it run a minute or two before moving it and see what happens. This could give us an idea of what might be going on here.
Don and Chris,

I drained the hydro fluid when I did the restore last year and replaced it with Type A ATF. Also replaced the filter, so its new (used a K&N HP-2004 Transmission filter). There is a leaking seal somewhere as there is a slow drip. I'll check fluid level tomorrow and do as you recommend, i.e. let it warm up for a few minutes and see what happens. Thanks again for the help!
 

·
Premium Member
Joined
·
7,358 Posts
I hope you find your leak. I doesn't take much in the wrong place to create problems. Check for side to side play in the input shaft bearing ( or busing ).
 

·
Senior Member
Joined
·
4,471 Posts
If it ok after let it run a few minutes I would suspect that the charge pump is losing its prime.
 
1 - 8 of 8 Posts
Top