HST vs. Gear Trans

   / HST vs. Gear Trans #51  
I see you have added 1-1/2 tons to your tractor ...

Kubota Grand L3940 HST + foldable ROPS: 3,627 lbs
Front end loader (model LA724): 1,168 lbs
Bucket (model "Square 72", "Quick Attach"): 331 lbs
Water weight in rear tires (tire size 17.5L-24): 515 lbs each
Total: 6,156 lbs

This is with no 3PH implement, no me (155 lbs), none of the other "stuff" riding with me (tools, chains, cooler, pole saw & pole saw mount, etc). Not sure if it includes fluids.
 
   / HST vs. Gear Trans #52  
You know...I work in fluid transmission (power generation and such) and I made an assumption that's probably incorrect.
The fluid couplings I've worked with don't use direct metal to metal contact, but a series of rotors and vanes (and the fluid which may be a hydraulic fluid or an ATF) actually connects the mechanical transmission components to the power source (in my case, large electric motors...not engines).
So, since I have never had an HST nor do I expect to own one, can't say I've ever looked at an illustrated breakdown/schematic other then in passing.
The assumption was that HST would use similar principles which it may...or may not.
In our case, the coupling is there to provide a "soft start" and has fusible plugs to vent the system if the fluid gets too hot. Remember, liquids don't compress...just generate heat.

So, if your HST works in the same manner, you'll get a degree of slippage which should ultimately vent out in some way to prevent the mechanical component damage.

That sound about right?
HSTs are a variable displacement pump. Not the same as a torque converter on an automatic tranny. Very not the same.
 
   / HST vs. Gear Trans #53  
HSTs are a variable displacement pump. Not the same as a torque converter on an automatic tranny. Very not the same.

Well, I wasn't describing a torque converter on an automatic transmisson...totally different animal.
However, where ever there is a fluid interface, there will be a degree of slippage. That's what prevents more serious damage. I wouldn't be surprised if there is a fusible plug in there somewhere.
Guess I'll do a bit of reading on HST since I do have the Deere service manual.
 
   / HST vs. Gear Trans #55  
Gear,,cause thats what I got,,,if I had hst,it would be that,now,that question is answered:laughing:
 
   / HST vs. Gear Trans #57  
For your cause, how long do you feel that you want to drive a tractor with armstrong power steering with a loader on it? I do hope you aren't a pencil pusher because it will get old FAST! We know your wife won't like the manual steering!

I have to second the comment about the power steering. Also, HST is much better and faster for FEL work. These little tractors (the B2320 included) are quite fuel efficient anyway. I have previously owned a B7100DT (gear drive), B7100HST (hydro), and now own a B7610. I didn't notice a difference in fuel consumption between the gear and hydro B7100's, but the B7610 does use more fuel than either of the B7100's. This is simply because B7610 has a 1100cc 24HP engine, had the B7100's have a 750cc, 16 HP engine. That said, for loader work, the B7100, IMHO, is just as capable as the B7610 (which is very comparable to the B2320 you are looking at).

The gear-drive B7100 was my first tractor. I purchased it primarily for loader work, box blade, and post hole digging. After about 20 hours of mostly FEL work, I bought the B7100HST, as the non-syncro gear drive got old with the back and forth of FEL work. I synchronized transmission would be much nicer than a non syncro one, but I still think hydro is best for this job. Gear drive shows it efficiency advantage on larger ag tractors pulling plows and other ground engaging implements all day long.

I put about 100 hours on the B7100 HST over the course of a year, and quickly tired of the "arm-strong" steering when doing loader work, but it was fine for everything else, including moving firewood pallets with the rear carryall (which made it easier to steer), and clearing snow from the driveway with the rear blade.

When I found a great deal on my B7610 ($7500 w/ a post-hole digger, and a york rake), I jumped on it, and sold the B7100HST (for $7000, including a cheaper post hold digger than came with the B7610, and also the york rake that came with it -- already had one).

Of course, you are looking at two completely different price ranges when comparing a B2320 to a B7100, so price definitely has to weigh in. If you can swing the B2320, I say go for it. If you need to keep the price low, you can't go wrong with a B7100, although, I'd definitely go for HST. If you're going to do a lot of FEL work, then you're better served with power steering.

You should be able to pick up a similar-sized older Kubota with power steering for not a lot more than some ask for their B7100's.

Models to look for that have power steering (in approx order of age, oldest to newest, HP in ()'s).
B1750 (20), B2150 (24)
B7500 (21), B1700 (17), B2100 (21), B2400 (24), B2700 (27)
B7510 (21), B7610 (24), B2410 (24), B2710 (27), B2910 (29)
B2320 (23), B2620 (26), B2920 (29)

I didn't list the Bxx30 models, as they are even more expensive than the B2320 you mentioned. I also didn't list the B8200 (19 hp) and B9200 (23HP) (from the 80's, which are a little larger than the B7100, because I don't know if either of these has power steering, but they might).

Good luck with your purchase, and learn from my experiences, and buy your third tractor first.
 
   / HST vs. Gear Trans #58  
Is there any reason to why HST isnt used on larger HP platforms?

Probably 1) cost; 2) less power lost with a gear transmission, often more important on bigger tractors. It's easier and cheaper to overcome the power loss in a small tractor than it is in a 50 or 100+ hp tractor. A 20%(?) loss is easy to overcome on a 20 hp tractor, more expensive on a 100 hp tractor.

Ken
 
   / HST vs. Gear Trans #59  
What's the general price difference between gear & HST for a compact tractor?

TIA,
Dana
 
   / HST vs. Gear Trans #60  
What's the general price difference between gear & HST for a compact tractor?

TIA,
Dana

Using my Kubota Grand L 3940 as an example:

Fully Sychronized transmission $22,159
Glide Shift $23,269 ... $1,110 over the Fully Sychronized transmission
Hydrostatic transmission $23,749 ... $480 over the Glide Shift transmission

These are MSRPs, so I would assume the actual prices would be a little closer together.
 

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