Steiner with danfoss series 15 pump

robjen1019 · Sep 12, 2011

Powered with a 27 hp diesel briggs, on really steep hills, the motor starts to bog really bad. Wondering if there is a bypass adjustment that could be set to allow the engine to keep rpms instead of bogging.

J_J · Sep 12, 2011

Apparently that angle is causing a large load on the pump and engine.

Has the Steiner had trouble before on this same hill.

Are you keeping the hyd control lever at the same position, or, or you trying to give the hyd motors more fluid when climbing?

J_J · Sep 12, 2011

Here is the PDF on your pump.

http://www.sauer-danfoss.com/stellent/groups/publications/documents/product_literature/bln-9646.pdf

The speed of the machine is dictated by the GPM's, and the load will dictate the pressure.

So if you are putting a heavy load on the pump, the pump will take all the HP the engine has to give to produce the pressure required by the hyd motors. If the engine is bogging down, you are at your limits, and should back off the lever control on the pump.

I have the Power-Trac 1445 with a similar pump made by Eaton, and 4 hyd wheel motors. I experience the same thing on hills.

robjen1019 · Sep 12, 2011

The tractor is new to me, but has 150 hours. If I let off the pump...slow down. it will usually make it up the hill, Most of the time I have to stop, let rpms catch up and then go some more. Im sure for the normal use, the pump is set up the way it is supposed to. But I just thought it would be nice if the engine could stay in the power band for the entire hill. When Im talking hill, its 45 degree angle. You can walk up it, but not very easy.

J_J · Sep 12, 2011

It can not stay in the power band due to the amount of force required to operate the pump. A larger engine would help, so you don't run out of HP.

SSdoxie · Sep 12, 2011

If you lowered the pump relief settings you would likely have the opposite problem, engine RPM would stay up but pump would stall out. Reducing pump stroke (slowing down) is same as down shifting a geared transmission, lower gear you are in the more power to the ground but at slower speed.

J_J · Sep 13, 2011

J_J said:
It can not stay in the power band due to the amount of force required to operate the pump. A larger engine would help, so you don't run out of HP.

If the machine can't do the job then it's time for some thought about whether the machine is worth having.

Above I mentioned about a larger engine, and this time I will mention larger wheel motors, which will provide more torque, but less top speed. It all depends on cost as to when it is time to trade up for a larger machine, or upgrade parts, or use another machine.

One of the Power-Trac guys needed more climbing power and changed out his wheel motors, and he said it made a world of difference. Although wheel motors are not cheap, up in the $300 to $500 range each.

robjen1019 · Sep 13, 2011

That sounds exactly what I need to do. Tractor does what it needs to do, I would just like it to do it with a little more ease. Increasing the motor size would do what I need. But sounds like a winter project. Thanks for the help.

robjen1019 · Sep 14, 2011

I took a look at the motors tonight, they are Sauer Series 15 pump and motor combination. Im looking and Sauer also has a 18 series motor. Wondering where would be a good place to start looking for parts. Thanks