Eaton Hydrostatic Model 700-042

[wesau]

G'day Forum,
I have joined this Group in the hope that someone can supply me with the information which I have, to date, not readily been able to locate.
I do not own a tractor, nor do I have a farm. Instead, I am a retired Engineer living in Australia and my hobby is building a scale miniature locomotive, which I have designed myself.
The drive train in this model includes an Eaton Hydrostatic Model 7, which will be driven by a 6.5HP petrol motor.
I have reached the point of having to decide which unit to procure.
My research has lead me to the Model 700-042, which is a unit that has 'the acceleration valves for smooth start'.
My questions are:
- how does this 'acceleration valve' function?
- where does this valve reside in the unit's hydraulic circuit?
- in the event that 'the smooth start' is not suitable, can the acceleration valves be bypassed/taken out of circuit, thus reverting the unit to the standard configuration?
The alternative to supplying me with answers to these questions, would be to supply me with contact details of a person who works in Eaton and who would be able to provide me with information.
I would prefer that contact with such a person be via email.
Regards to all, from a 'blow-in'!
Bill Simpson.

 

[Baby Grand]

Firstly, welcome to TBN!
We're all about making things do things, here.
That's including, but not limited to tractors.

The acceleration valves get some discussion in the manual in the Model 11 section.
Looks like the acceleration valves are an option on the Model 11 series, but I don't see them listed on the Model 7 series.
Actually, I don't see a listing for the Model 700-042, of which you speak.
Maybe it was added to the lineup after this was published (2008)?:

http://www.eaton.com/ecm/groups/public/@pub/@eaton/@hyd/documents/content/pll_1616.pdf

 

[wesau]

G'day Baby Grand,
Thanks for the prompt reply and your kind welcome.
The subject Eaton item number has come to my attention via eBay, the avenue I intend using when I purchase.
Eaton Item No. 700-042 is currently on offer by an American company that sells a wide range of Eaton products via eBay; see eBay item 161406110843, which includes a brief description of the unit.
Can you guide me to the writings on acceleration valves, as applied in Model 11 series?
Regards,
Bill.

Firstly, welcome to TBN!
We're all about making things do things, here.
That's including, but not limited to tractors.

The acceleration valves get some discussion in the manual in the Model 11 section.
Looks like the acceleration valves are an option on the Model 11 series, but I don't see them listed on the Model 7 series.
Actually, I don't see a listing for the Model 700-042, of which you speak.
Maybe it was added to the lineup after this was published (2008)?:

http://www.eaton.com/ecm/groups/public/@pub/@eaton/@hyd/documents/content/pll_1616.pdf

 

[mddorange]

:welcome:
To the forum Bill, from Alabama, USA. How big is your locomotive going to be? How many drive wheels? Is this going to be used outside?

 

[oldnslo]

From the data sheet that Baby Grand had the link to.

Acceleration Valves
Acceleration valves are available on models for applications where gradual acceleration from neutral is desirable. The valves are open in neutral position. The valve in the side of the circuit being used closes gradually as the pressure increases, cushioning load accelera- tion. On deceleration when pressure is decreased below a certain point the valve opens, bypassing the pump flow.

 

[Baby Grand]

Pages 9 & 11 show illustrations that include the acceleration valves.
It sounds like their purpose is to give you "soft start" acceleration, so it doesn't jerk when you engage it. Might be desireable on a model train? There may be a way to defeat the valve function if you really find it to be objectionable.

 

[woodlandfarms]

I have no way to answer your question, but I might point you to this guy

http://www.tractorbynet.com/forums/build-yourself/322472-tractor-no-15-will-cat-23.html#post4008212

Look at the latter part of the conversation, he builds trains as well.

 

[wesau]

G'day mddorange,
Thanks for the reply.
The locomotive will run on a 71/4" gauge railway; this gauge, together with 71/2' gauge, being the two miniature railroad standards that apply in USA.
The locomotive is 1540mm long x 415mm wide and 650mm at the highest level of the cab work; I estimate it will weigh 350-400kg when finished.
My model is based upon the NSWGR 0-6-0 70 Class diesel hydraulic units that ran in and around the Port Kembla Steel Works in the period 1960-80.
The model is designed to run in the rain, as all the drive train will be protected under the scale body work.
Regards,
Bill.

:welcome:
To the forum Bill, from Alabama, USA. How big is your locomotive going to be? How many drive wheels? Is this going to be used outside?

 

[wesau]

G'day Baby Grand and oldnso,
Thanks for your latest respective replies.
I have picked up the Eaton writings to which you refer. This information is both new and useful; thanks.
As well as accelerating the locomotive, I am expecting to be able to control deceleration of the locomotive using the Eaton Hydrostatic unit, through to the point of a complete stop.
The last sentence in oldnso's information, which reads thus:
'On deceleration when pressure is decreased below a certain point the valve opens, bypassing the pump flow.'
prompts a further query.
Will the deceleration action, being supplied by the Eaton unit, disappear when the pump flow is bypassed?
Regards,
Bill.

 

[mddorange]

G'day mddorange,
Thanks for the reply.
The locomotive will run on a 71/4" gauge railway; this gauge, together with 71/2' gauge, being the two miniature railroad standards that apply in USA.
The locomotive is 1540mm long x 415mm wide and 650mm at the highest level of the cab work; I estimate it will weigh 350-400kg when finished.
My model is based upon the NSWGR 0-6-0 70 Class diesel hydraulic units that ran in and around the Port Kembla Steel Works in the period 1960-80.
The model is designed to run in the rain, as all the drive train will be protected under the scale body work.
Regards,
Bill.

Thanks for the info. That is what I thought you were doing. That is a little over 5' long and a 16" wide. Are you going to have railroad cars with it and how long will the track be?