2001 tc45 hst question

[dfkrug]

I totally agree with fixing it, I'm certain that the parts are not that expensive, and the rebuild is mostly labor intense. If it were mine, and out of warrenty, I would pull it apart myself, with the help of a manual. Heck, it's just a few hydro motors isn't it? The engine drives one, and the driven one drives the second to the gear sets? Not that simple, but with proper manuals, and specs available it could be repaired. I remember the fellow who's hydro failed a few years back said his failure was traced to a sinstered bronze bushing in the pump which turned back to powder. I'm sure that this one failed simply also, with only 750hours. Lots of labor, but not impossible to rebuid. Most likely when disassembled the problem will be seen.

Now I've heard that the Kubota glide shifts are extremely complicated, and about the toughest to fix and repair. I was told that Kubota dropped the glide shift from their line also. I drove one once and didn't like it. When it shifted, it would spin the tires, and that was a almost idle. Seemed that a lot of internal wear could have been occuring.

Yes, an HST is an engine-driven pump that pumps fluid to a hydraulic motor.
Fairly simple. The pistons on the pump and motor are matched to the
blocks, so you may have to buy each as an assembly. There are no seals,
except where shafts poke out thru the HST block. I posted pix of a HST's
guts in my B21 thread.

Kubota's GST is still available and offers the complications of a gearbox with
the addition of wet clutches. Probably synchros too, but I have not seen
inside. More and more like an automotive tranny. Kubota seems to have
done away with their "crash box" trannies (no shuttle and no synchros) for
their most economical trans, which is now the FST fully synchro unit. I am
sure the Kubota experts on TBN can comment here.

 

[jmyers9668]

Well here's the latest. I called the hydro shop that the hst was sent out to directly. I talked directly to the owner and he seemed very willing to talk with me and was full of answers to the many questions I had for him. Apparently my hydro had what is referred to as momentary seizure. One of the nine pistons in the hydraulic pump seized with the sleeve and pushed it out of the cylinder block. So the part I need is the cylinder block, which is not available. I can buy the rebuild kit but that includes everything but the block. the hydro shop that has the hst says they are looking into the option of having a machine shop manufacture and install a new sleeve. I called KYB the manufacturer of the hst and they can't believe that new holland doesn't make that part available, but can't help me get one for proprietary reasons. I'll keep you up to date thanks. John

 

[RickB]

Well here's the latest. I called the hydro shop that the hst was sent out to directly. I talked directly to the owner and he seemed very willing to talk with me and was full of answers to the many questions I had for him. Apparently my hydro had what is referred to as momentary seizure. One of the nine pistons in the hydraulic pump seized with the sleeve and pushed it out of the cylinder block. So the part I need is the cylinder block, which is not available. I can buy the rebuild kit but that includes everything but the block. the hydro shop that has the hst says they are looking into the option of having a machine shop manufacture and install a new sleeve. I called KYB the manufacturer of the hst and they can't believe that new holland doesn't make that part available, but can't help me get one for proprietary reasons. I'll keep you up to date thanks. John

Well, I'm glad you got some answers. Things add up a little better when all the information is available. I hope the hydro shop can get the unavailable part built.

 

[Flatheadyoungin]

even though the hit (any direction) is going to hurt, it's really is more comforting when you finially get through to to someone that actually knows what he/she is doing AND is willing to talk it through to you...

it's only 8 years old, i can't figure how they wouldn't offer that part?????

the resleeve sound interesting....surely a good machine shop can resleeve that.....i've only rebuilt engines, i've never been into a hydro, however, so i may be speaking out of my league......

have you tried another deal just to see if they give you the same answer aboutthe part not being available....

Well here's the latest. I called the hydro shop that the hst was sent out to directly. I talked directly to the owner and he seemed very willing to talk with me and was full of answers to the many questions I had for him. Apparently my hydro had what is referred to as momentary seizure. One of the nine pistons in the hydraulic pump seized with the sleeve and pushed it out of the cylinder block. So the part I need is the cylinder block, which is not available. I can buy the rebuild kit but that includes everything but the block. the hydro shop that has the hst says they are looking into the option of having a machine shop manufacture and install a new sleeve. I called KYB the manufacturer of the hst and they can't believe that new holland doesn't make that part available, but can't help me get one for proprietary reasons. I'll keep you up to date thanks. John

 

[Hooked_on_HP]

I have never seen a do it yourself manual for hydro's. All the manuals I have at work for hyd. pumps and motors give you basic assembly and disassembly procedures. They do not tell you every step. eg. They tell you to remove the swash plate in order to remove the pistons. They don't tell you how.They assume that the person taking the pump apart is a professional and has the proper tools and knowledge to perform the job.. I work with some very good mechanics who can't rebuild a variable displacement hyd.pump even with the manuals. I would say this is not a DIY job.
Bill

 

[jinman]

I called the hydro shop that the hst was sent out to directly. I talked directly to the owner and he seemed very willing to talk with me and was full of answers to the many questions I had for him.

Wow! What a difference a little information makes. I suddenly feel much better about the shop and the fact that your dealer chose them to work on your transmission. I think you are getting the best help possible in this situation.

 

[dqdave1]

You would think with the supplied information; CNH could obtain the part needed on a special order from the manufactor.

 

[dfkrug]

Apparently my hydro had what is referred to as momentary seizure. One of the nine pistons in the hydraulic pump seized with the sleeve and pushed it out of the cylinder block. So the part I need is the cylinder block, which is not available. I can buy the rebuild kit but that includes everything but the block. the hydro shop that has the hst says they are looking into the option of having a machine shop manufacture and install a new sleeve.

OK, now you got the straight dope. Sounds like good news to me. The
debris from the failed liner may have only damaged the end plates. That
could have damaged all of the slippers on each piston, too, requiring all
new pistons.

My Kubota HST did not use liners in the block. The pistons were a close
tolerance fit into a steel block. Having a new liner made to fit the bad bore
in the block is basic machine shop work, not beyond the scope of DIYs
with a lathe. Not too expensive at a machine shop either. Often when
replacement parts are super-expensive, having the parts custom made in
a machine shop is cheaper. I once paid a shop to custom cut a full set
of 32 valves and retainers for a Ferrari V8 because the OEM parts were
too expensive. Saved over 60% and got titanium retainers by going custom.

As for service manuals, even the best factory manuals do not provide
adequately detailed step-by-step instructions for many major rebuilds.
A lot of the skill necessary to rebuild something like an engine or tranny is
acquired thru a careful analysis during dissassembly. Some basic skills need
to be there first, of course: cleanliness, organization, use of micrometers,
use of pullers, use of presses, etc. Some manufacturers don't even publish
service manuals (e.g. Ferrari and BMW, with a few exceptions).