Hydraulic gear pump vs axial piston pump.

[funwithfuel]

Its not a fair test. Not really. It will tell you if the motor is worn out. Case drain is for cooling and lubricating oil. If you remove the hose from the machine to the implement and cap the end from the machine, you can shove a piece of rubber hose like old heater hose or whatever on the nipple of the motor. Clamp it securely. Start the machine, have the hose empty into a bucket. When you spin up the implement, you're looking for a trickle to a steady light flow. What you don't want to see is heavy flow or surging. When you stop the implement, you shouldn't see any more flow. That oil should shuttling between A & B
Rule of thumb, the flow from case drain should not exceed 10% of motors rated flow. This would require you to find the flow rate of your motor. Reach out to the mfr. of the mower or the motor if you can find the tag.
Hope I didn't muddy it up too much, good luck

 

[bayslasha190819]

I am unfamiliar with your attachment but pics and description are terrific. You say the horrible noise starts when you stop the implement. Without hearing it. I would guess the rotating mass continues after you close the flow. In the motor, should be an anti-cavitation valve. This keeps the motor from becoming a pump and blowing itself up. It takes oil from the B port and directs it to the A port. It does this through a restricted passage to help slow the implement without a sudden stop which break all the expensive things.
Again this is based on NOT HEARING WHAT YOU'RE DESCRIBING. But to be safe, I'd advise a filter service on your hydro circuit and to inspect the filter media . Make sure you have no debris and no sparkly bits. Also , very important, make sure that the case drain line is clear and smooth with no kinks or obstructions.
Good luck

I am unfamiliar with your attachment but pics and description are terrific. You say the horrible noise starts when you stop the implement. Without hearing it. I would guess the rotating mass continues after you close the flow. In the motor, should be an anti-cavitation valve. This keeps the motor from becoming a pump and blowing itself up. It takes oil from the B port and directs it to the A port. It does this through a restricted passage to help slow the implement without a sudden stop which break all the expensive things.
Again this is based on NOT HEARING WHAT YOU'RE DESCRIBING. But to be safe, I'd advise a filter service on your hydro circuit and to inspect the filter media . Make sure you have no debris and no sparkly bits. Also , very important, make sure that the case drain line is clear and smooth with no kinks or obstructions.
Good luck

Its not a fair test. Not really. It will tell you if the motor is worn out. Case drain is for cooling and lubricating oil. If you remove the hose from the machine to the implement and cap the end from the machine, you can shove a piece of rubber hose like old heater hose or whatever on the nipple of the motor. Clamp it securely. Start the machine, have the hose empty into a bucket. When you spin up the implement, you're looking for a trickle to a steady light flow. What you don't want to see is heavy flow or surging. When you stop the implement, you shouldn't see any more flow. That oil should shuttling between A & B
Rule of thumb, the flow from case drain should not exceed 10% of motors rated flow. This would require you to find the flow rate of your motor. Reach out to the mfr. of the mower or the motor if you can find the tag.
Hope I didn't muddy it up too much, good luck

Oh yeah YouTube of course silly me .

 

[funwithfuel]

That's anti-cav working. Wouldn't lose any sleep over that.
I still suggest checking the filter whenever adding a motor circuit to your machine. That will catch trash before it hurts your machine.

 

[bayslasha190819]

Unfortunately there is no tag or identification on the motor?!!

 

[bayslasha190819]

That's anti-cav working. Wouldn't lose any sleep over that.
I still suggest checking the filter whenever adding a motor circuit to your machine. That will catch trash before it hurts your machine.

Oh really???!!! It sounds horrible

 

[bayslasha190819]

Out of curiosity, I engage the foot throttle to run the unit. ( if put my heel down it will spin in reverse, does this sound ok to you). Depending on the Hyundai, can I set it to turn on and stay on ? Possibly ? Thanks son much for your help mate .

 

[funwithfuel]

You have to consider all the rotating mass and weight driven off that motor. Then you suddenly stop the flow, if you didn't have anti-cav, the motor would revert to a pump, with no place to send the oil, it would either snap off or blow a hose.
There are things you could do if it's that concerning. You could set up your drive with a Sprague clutch or something along those lines. You could throttle down prior to shutting down. Some things cost nothing, others want to break the bank.
Good luck with whatever you choose.

 

[funwithfuel]

Out of curiosity, I engage the foot throttle to run the unit. ( if put my heel down it will spin in reverse, does this sound ok to you). Depending on the Hyundai, can I set it to turn on and stay on ? Possibly ? Thanks son much for your help mate .

You should be able to set your option behavior to hammer mode which would be one way flow. In shear you have bi-directional flow. While its not terrible, you don't want to reverse flow when at speed , that would definitely contribute to a hurt motor.

 

[Tones]

Every thing that funwithfuel has post here is absolutely on the money.
The hydraulic motor looks very similar to a Rexroth bent axis FM series. Is there a tag on the opposite side to were the casedrain hose is? If there is from memory the first 2 numbers are the motor size in cc, thats the amount of oil required for 1 rotation.

 

[bobatack]

Out of curiosity, I engage the foot throttle to run the unit. ( if put my heel down it will spin in reverse,

If the unit can be run in reverse rotation then there is not a crossover check valve installed
Would highly recommend adding one if the unit needs to spin one direction only

 

[bayslasha190819]

Every thing that funwithfuel has post here is absolutely on the money.
The hydraulic motor looks very similar to a Rexroth bent axis FM series. Is there a tag on the opposite side to were the casedrain hose is? If there is from memory the first 2 numbers are the motor size in cc, thats the amount of oil required for 1 rotation.

Thanks tones heaps mate .

 

[bayslasha190819]

If the unit can be run in reverse rotation then there is not a crossover check valve installed
Would highly recommend adding one if the unit needs to spin one direction only

That’s where I’m a bit concerned I’ve done damage to the pump if I have run it in reverse a few turns ? Anyway . Fun with fuel reckons I may be overthinking it. But you can never be too Safe with these types of pressures .

 

[Tones]

In order to stop confusion, the hydraulic motor isn't a pump. The pump is what drives the hydraulic motor from the opposite end of the curcuit
By bringing the engine to an idle then stopping the mower will help with the longevity of the hydraulic system. Doing the opposite on startup will also help.
Where abouts in Oz are you based?

 

[Tones]

Because of the open loop curcuit you should be OK but don't go from 1 direction to the other at full noise.

 

[bayslasha190819]

In order to stop confusion, the hydraulic motor isn't a pump. The pump is what drives the hydraulic motor from the opposite end of the curcuit
By bringing the engine to an idle then stopping the mower will help with the longevity of the hydraulic system. Doing the opposite on startup will also help.
Where abouts in Oz are you based?

In between Byron bay and mullum mate on the coast.

 

[bayslasha190819]

Because of the open loop curcuit you should be OK but don't go from 1 direction to the other at full noise.

I removed the case drain and it seems its
All fine in that department. Would you set work mode to crusher or breaker?

 

[funwithfuel]

I removed the case drain and it seems its
All fine in that department. Would you set work mode to crusher or breaker?

Looks as close to perfect as you could ask for. As for setting, I would go breaker or hammer. Depending on what you folks call it down there. But ideally you want one way flow without the possibility of reversing all that weight while rotating. Thats a pretty cool attachment, thanks for sharing it.

 

[Tones]

In between Byron bay and mullum mate on the coast.

Know the area well, the bloke who bought my machine was just inland from Byron, spent quite a few months working it for him on a development he was doing at Coorabell.

 

[bayslasha190819]

Looks as close to perfect as you could ask for. As for setting, I would go breaker or hammer. Depending on what you folks call it down there. But ideally you want one way flow without the possibility of reversing all that weight while rotating. Thats a pretty cool attachment, thanks for sharing it.

Thanks mate for your wise and measured counsel. It’s deeply appreciated.

 

[funwithfuel]

wise and measured counsel.

Thats a good one. Im dying over here.