How to slow down hyd cyl travel

[jinman]

I only have 25 years of experience on logging cranes and logging equipment....

That could be a problem. The TC33D is not nearly as big as the equipment you have so much experience with. Where is the OP going to mount all these restrictor valves and checkvalves? Andy suggested the restrictor orifice as a cheap and easy solution. I agree. If you put one inline it takes up hardly any space at all. If it doesn't work satisfactorily, what have you lost? $5 and the installation time. I have a restrictor on every one of my remote hydraulic circuits I use for hydraulic cylinder position control. They work great. That's my experience. I have no experience whatsoever with hydraulic swing cylinders on a compact tractor backhoe, so if you disagree with me or know something special about them, then I'll surely defer to your expertise.

 

[JoelD]

For what it's worth, I've found both Wayne and JJ to be among the most valuable posters. For the record, hydraulics is what Wayne does. Not sure what JJ's profession is, but no doubt the guy knows his stuff when it comes to tractors (and definately not limited to tractors).

Anyway, both are quick to recant when wrong (not often) or have misinterpreted the question.

Just for the record, both these guys spend a chunk of their time answering any and all questions the can field.

Any and all input is hugely helpfull and rarely if ever have I whitnessed assaults on the forum. And even then, most of the time it is a result of two or more guys trying to get to what they believe is the right answer. All valuable information to me.

I've used the blunt fitting, drilled a small hole and put in line with my swing cyls. and it worked great for me. Was a small hoe with about 3 gpm pump.

I do like JJ's idea of the adjustable fitting, would think nice to be able t o easily go back and forth in rate of swing if need be.

Joel

 

[SPYDERLK]

see my previous post....that?s how cylｴs are plumbed....if you want 100% speed ctrl, you must restrict the return....[[[otherwise both gravity and inertia can move the sving]]]....
Use variable restrictor with a checkvalve, one on each side, make sure they let oil into cylｴs unrestricted, and restrict oil on return from cylｴs...

That could be a problem. The TC33D is not nearly as big as the equipment you have so much experience with. Where is the OP going to mount all these restrictor valves and checkvalves? Andy suggested the restrictor orifice as a cheap and easy solution. I agree. If you put one inline it takes up hardly any space at all. If it doesn't work satisfactorily, what have you lost? $5 and the installation time. I have a restrictor on every one of my remote hydraulic circuits I use for hydraulic cylinder position control. They work great. That's my experience. I have no experience whatsoever with hydraulic swing cylinders on a compact tractor backhoe, so if you disagree with me or know something special about them, then I'll surely defer to your expertise.

[[[ This [marked above] is AKKAMAANs key point - and a very good one in the type of use he alludes to.]]] Where there is gravitational or inertial or any other outside force driving the cyl in the direction you are making adjustment the hydraulic driving side needs to be unrestricted. Otherwise the driving side will not be able to feed fluild as fast as the return side lets it back to the tank. The drive side will end up under vacuum and end up unfilled. This will give spongy and delayed action [poor control] in the hyd circuit.

In many of our applications we dont always, or even often, deal with outside forces in the direction we are making adustment. In that case a restrictor in either line is good -- and easy. One area we do tho - dumping a heavy bucket load. A slow controled heavy dump will often result in a floppy bucket until you cycle it a time or two. A fast dump, where both sides of the cyl are pressurized [regen] will prevent this.
larry

 

[J_J]

The original poster was only worried about the swing cylinder speed, and there is not a whole lot of residual force on either swing cylinder, unless you are really slamming the machine. He could put a restrictor in each of the cylinder circuits and by selecting the right orifice, set the speed of the cylinder operation. This would really be what you would call a custom set up. Selecting the correct orifice might take a little time, but can be done. However, if a needle valve were in each cylinder circuit, I think this would be the ideal set up., and be able to tweak the hyd circuits as needed. Some people like Premium, and some like regular.

 

[tommu56]

I also installed on my backhoe a parking brake unit found in a scrap yard and connected it to the clutch. it work well and come very handy when I can't have the BH to move the tractor. I just leave the tractor engaged in the first gear ( max half MPH). Since there is a latching system on the parking brake lever I just leave the clutch dissengaged.

BTW excuse the frenchmen with poor english writing

The clutch is only used for moments at a time you will wear out the throwout bearings faster if you latch the clutch down
Its just about like riding the clutch on a stick car

Read 3rrl's thread about his clutch repair on his tractor.
If you never split one it's 10 x worse than doing a truck or car.

I would suggest stop dogging the clutch and use the hoe to push the tractor around.

tom

 

[BlacknTan]

Where do you guys find these blunt fittings?

I've googled it, looked on the hydraulic sites, checked catalogs... I can find restricted fittings, but not blunt.

 

[Eagleview]

It is possible to fill the end of a fitting with Silver solder , then drill a smaller hole threw it . Be aware that if you decide you need twice as much flow as the first hole allowed , don't drill it out twice the size . Doing this will allow nearly 3 times more flow .

 

[SPYDERLK]

It is possible to fill the end of a fitting with Silver solder , then drill a smaller hole threw it . Be aware that if you decide you need twice as much flow as the first hole allowed , don't drill it out twice the size . Doing this will allow nearly 3 times more flow .

I thread a set screw with small drilled hole into the fitting. For real slow you dont even need a hole. the oil follows the thread helix.
larry

 

[RiZak]

The clutch is only used for moments at a time you will wear out the throwout bearings faster if you latch the clutch down
Its just about like riding the clutch on a stick car

Read 3rrl's thread about his clutch repair on his tractor.
If you never split one it's 10 x worse than doing a truck or car.

I would suggest stop dogging the clutch and use the hoe to push the tractor around.

tom

Suggestion taken. I don't use it often but it come realy helpfull at time. I will just have to continue the mod and put anextension on the shifter so I can access it from the backhoe. Thanks for the tip.

 

[kthompson]

Boys here just lower the engine's rpms. It is amazing how much a couple of hundred rpm difference can make in the speed. Then when you are where you need the full hyd speed it is very simple to pick up the rpms.