Just took delivery of my first ever lawn tractor with a hydrostatic
transmission. Not being a Lexus I don't expect silence, that said when
engaging forward or reverse it's not exactly quiet either.
Curious to learn from others what "normal sounds" to expect. I'm
purposely not including the sounds I'm hearing so I can instead compare
users descriptions to the sounds generated. Hopefully with your inputs
I'll have an idea of what is normal and what should be of concern.
Other than some pump noise, perhaps, I'd expect essentially no
transmission sounds based on everything from lawn mower and tractors to
mid-40's hp tractors (as another poster, all green).
If it's anything else, I'd suggest time to ask the dealer if it's not
some junk walmart special...
My John Deere is basicly silent, in other words, I hear no noises above the
sound of the engine. This includes switching back and forth from forward to
reverse which I can do quickly with the two foot pedals.
Well, off the top of my head, hooo-weee!!! Chigga,
Chigga!!!! is probably a bad sound. Hmm, grumble grumble is
probably OK, and Ahumma Ahumma is probably closer to
normal. Depending if you have a drawl.
The only noise is the pump whine. That's normal. There's absolutely
no sound from the transmission. That, by the way, is for a 32 year
old, Case 222.
It sounds like you have a problem. No pun intended.
Is it good if a vacuum really sucks?
The closed loop system needs to be controlled and reversed by an
external mechanical system.
Often, a hydrostatic transmission is combined with a planetary gearset
and clutches to create a hybrid system known as a hydromechanical
transmission. Hydromechanical transmissions transfer power from the
engine to the wheels in three different modes. At a low speed, power is
transmitted hydraulically, and at a high speed, power is transmitted
mechanically. Between these extremes, the transmission uses both
hydraulic and mechanical means to transfer power. Hydromechanical
transmissions are ideal for heavy-duty applications, which is why they
are common in agricultural tractors and all-terrain vehicles.
This is NOT how a Case works.
I hope you mean other types of vehicles when you state "all-terrain
vehicles", because ATV's (All-Terrain Vehicle) are all strictly
mechanical using either a wet multi-clutch system or a variable torque
converter, no hydraulics.
On Wed, 23 Sep 2009 20:30:23 -0500, Gordon Shumway wrote:
Discovered the noise I was mistaking for the transmission was actually
further forward. A "scrunch, clang" and engine stall forced me to
investigate closer. Turned out the pulley on the left side mandrel wasn't
properly positioned. The extra tension was playing havoc with the deck.
Fortunately a few minutes with a wrench resolved that. Afterwards machine
ran well for the rest of the afternoon.
Next project will be to check what else may not have been assembled
For those interested the culprit is a Sears Craftsman YT3000 (28922)
I've noticed noise, sot of a whine when fluid is low. Find out how to
check it and what it uses then top it off if necessary. I've had them
that use type F ATF, and others that use 30 wt oil. I've also had one
that if it was changed was a challenge to bleed & would get soft to
the point of refusing to climb hills with the air once fully warm.
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