What is this

[woodlandfarms]

Sedgewood. Ponytug.

First, Sedgewood (lovely to hear from you btw) It looks to me like I can just take out the fitting while the device is mounted on the tractor. There are no springs to fly out or anything crazy like that, right? No surprises other than the steel ball? And this connection is the middle one? Also, it is just the one side or do I have to do both sides?

Ponytug. OK. So how does an accumulator work, and why? In laymans terms of course.

I am having a hard time believing I don't have one.

Oh, I did find two more of these connecting blocks. Both are on the right side in front of the rear wheel in the engine tub.

One has an electrical wire running to it, the others do not... Anyone venture a guess? I emailed Terry for an explanation but no joy yet.

Carl

 

[woodlandfarms]

Sedgewood. In re-reading your notes...

In the detailed picture, it is #8 that has the shuttle valve ball, correct? The others do not?

 

[Sedgewood]

Sedgewood. In re-reading your notes...

In the detailed picture, it is #8 that has the shuttle valve ball, correct? The others do not?

No, it's the ones labeled as to the pump, left side and right side [37].

The others do not.

No springs - just the little steel ball that might or might not roll out of the hole into the greasy glop in the tub when you pull the fitting free. You do have greasy glop in your tub don't you? Make that "fittings" - you'll want to check both sides.

Sedgewood

 

[woodlandfarms]

Thank you very much Sedgewood. Truly appreciate your help and your great site.. I have read and re-read it dozens of times.

Carl

 

[J_J]

Sedgewood. Ponytug.

First, Sedgewood (lovely to hear from you btw) It looks to me like I can just take out the fitting while the device is mounted on the tractor. There are no springs to fly out or anything crazy like that, right? No surprises other than the steel ball? And this connection is the middle one? Also, it is just the one side or do I have to do both sides?

Ponytug. OK. So how does an accumulator work, and why? In laymans terms of course.

I am having a hard time believing I don't have one.

Oh, I did find two more of these connecting blocks. Both are on the right side in front of the rear wheel in the engine tub.

One has an electrical wire running to it, the others do not... Anyone venture a guess? I emailed Terry for an explanation but no joy yet.

Carl

Carl,


An accumulator is a devise to store hydraulic fluid under pressure. It could be a small tank, or a cylinder, pressurized with nitrogen or it may be a bladder type accumulator. It could be very dangerous if you try to take apart a pressurized unit, it could explode, injecting hydraulic fluid into the wrong places, and could amputate a limb or rupture a body.

 

[woodlandfarms]

Well. I guess I am leaving it alone then

So, what you are saying is the pump pumps this thing up to 3000PSI (my pressure) and it keeps the system stable (no fluctuation in pressure)?

Carl

 

[Bob999]

So, just had Terry go through my photos...

2 - Is the charging circuit. I still don't completely understand how this works (anyone?) but it increases the pressure to the system. Yes it can leak and may need a repair down the road. The accumulator stores "pressure" as noted by JJ. The accumulator will tend to level out the pressure in the system--absorbing pressure (reducing the increase) when pressure rises, and releasing pressure (tending to maintain pressure) when system pressure falls. The ability to level out pressure is limited by the size of the accumulator.

3 - Some sort of manifold blaock. Puts oil back in the system Manifold blocks are simply connectors--multiple hoses are connected to them and internal circuits within the block connect some or all of the hoses. PT also uses manifold blocks for solenoid operated valves--the PTO circuit is an example. In the manifold block with the PTO valve internal circuits within the block route high pressure fluid from the PTO pump to either the PTO outlet at the front of the machine or to the tank, depending on the position of the PTO valve.

See comments above.

 

[woodlandfarms]

Terry might be right on the Shuttle Ball issue. My block is way different than Sedgwoods. initially it looks the same but now I am rethinking it and I feel I have a different beasty...

I will get more pictures tomorow when the sun comes up.

Carl

 

[ponytug]

Unless you need to fuss with it, yes, please, leave it alone. They do occassionally go bad, but not often.
The accumulator is on the brake circuit. The brakes need ~600psi to come off. I presume it is there to ensure that

1. the engine is at least spinning up, and
2. to ensure that as the brakes engage, there is somewhere for the fluid to go.

Of course, these are both guesses, and you should probably ask Terry for insights as to why PT put it there.

All the best,

Peter

Well. I guess I am leaving it alone then

So, what you are saying is the pump pumps this thing up to 3000PSI (my pressure) and it keeps the system stable (no fluctuation in pressure)?

Carl

 

[J_J]

Unless you need to fuss with it, yes, please, leave it alone. They do occassionally go bad, but not often.
The accumulator is on the brake circuit. The brakes need ~600psi to come off. I presume it is there to ensure that

1. the engine is at least spinning up, and
2. to ensure that as the brakes engage, there is somewhere for the fluid to go.

Of course, these are both guesses, and you should probably ask Terry for insights as to why PT put it there.

All the best,

Peter

Peter,


Are your brakes spring applied or hydraulic applied? I remember reading somewhere, that the brakes were spring loaded, and when stopped the spring applied brakes would keep the hydraulic motor from turning. When there was enough pressure built up in the fwd or reverse mode, part of the hydraulic fluid going to the motor pushes the springs back allowing the motor to turn. I can't remember if this system was used on hydraulic motors from PT, or other manufactures.

Although hydraulic accumulators are used to dampen out pulsations, in some system, I am thinking that the accumulators used on the PT is used for the brake system. Is it true that you can pump up the brakes on certain PT's? If this is true then the hydraulic accumulator is used to store fluid under pressure for the brake system.

If you have the spring applied brakes, and you have to move the PT with engine off, what do you do, pump up the system to get the brakes to release, and of course turn the the free flow valve on the tram?