110 TLB and hammer

[RickB]

Charles,
When a cylinder spool is returned to the middle position the outlet ports are closed off which keeps the cylinder fixed in place. when a motor spool is returned to the middle position the outlet ports are open to each other. The idea being that this allows the motor which may be turning fast to slow gradually. When you run a motor on a cylinder spool valve and return to the middle quickly it tries to stop the motor instantly causing undue stress on everything.


Steve

All true.
In applications where hydraulic motors are attached to low inertial loads, or are operated at low shaft speeds, closing the valve spool at low engine speed/low oil flow typically causes no damage. Alternatively, placing the cylinder spool valve in float (if it has that position) allows the motor to coast to a stop.

 

[Charlesaf3]

thanks. That makes sense. And I bet that will be relevant to me. The auger spins slowly, but the harley rakes don't. Unfortunately, I only have an on off setting, no feather. Guess I'll have to do that with engine RPM.

You guys are really an amazing resource. I honestly learn something like this just about every day I come on here.

 

[kennyd]

thanks. That makes sense. And I bet that will be relevant to me. The auger spins slowly, but the harley rakes don't. Unfortunately, I only have an on off setting, no feather. Guess I'll have to do that with engine RPM.

You guys are really an amazing resource. I honestly learn something like this just about every day I come on here.

You can always add a Cushion Valve to your remote if it becomes a problem.

 

[Charlesaf3]

huh. That's really interesting. Do you think I could put quick connects on it to make it go only on the motorized attachments? Would it cut flow noticeably?

I'm using stuff made for skidsteers - do they have motor spools automatically, or are we basically all just abusing the motors "normally" if that makes sense?

 

[kennyd]

The valve will handle the flow-it's rated for 30 GPM. The QD's however could be a problem, but you can use the next size larger than your hose to limit restriction.

I am not sure about the valves on the SSL's, but it's quite possible they have a cushion built into them for this very reason.

 

[J_J]

Charles,
When a cylinder spool is returned to the middle position the outlet ports are closed off which keeps the cylinder fixed in place. when a motor spool is returned to the middle position the outlet ports are open to each other. The idea being that this allows the motor which may be turning fast to slow gradually. When you run a motor on a cylinder spool valve and return to the middle quickly it tries to stop the motor instantly causing undue stress on everything.


Steve

What Charles said. It is a good idea to put a double relief valve across the hyd motor, and if you do use a cylinder valve, the fluid will go into relief, protecting the motor. I thought most all aux valves were motor spool valves. The valves could be changed over to motor spool. for use with a hammer or motor attachment.

 

[Charlesaf3]

any downside to using a motor spool with a cylinder?

 

[kennyd]

any downside to using a motor spool with a cylinder?

The cylinder will not hold position when the valve is in neutral because the work ports are open to the tank, thus allowing the motor to free-wheel.

 

[Charlesaf3]

ah. So skid steers must have cylinder spools too.

I guess they just figure the motors will have to absorb some shock?

 

[MessickFarmEqu]

ah. So skid steers must have cylinder spools too.

I guess they just figure the motors will have to absorb some shock?

This is typicaly not an issue on implements you've got. When you get into higher flow attachments you'll have a 3rd case drain line that dumps back into the transmission. When you're dealing with alot of flow and inertia its important to do this right, it can tear stuff up real quick.