Steiner with danfoss series 15 pump

[robjen1019]

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]

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]

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]

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]

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]

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]

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]

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]

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

 

[J_J]

Try here.

Young Powertech Inc - 900 Series Gear Reducers

 

[Large Bear 13]

Here is some information that may help you.
DRIVING THE STEINER
430 TRACTORS

1. Steiner hydraulic drive tractors are designed for operator ease, (no more clutching and shifting gears manually) which means no preset speeds.

2. Operate tractor with engine running at full factory recommended RPM. Never lug engine below 3000 RPM. This allows the hydraulic pump to perform at top performance while driving the tractor.

3. The hydraulic drive pump determines what speed you drive.

4. The hydraulic drive pump is controlled by the operator moving the forward/reverse lever back and forth.

5. The forward/reverse lever can be thought of as a gear shifter, it should be moved slow and steady, allowing the pump time to build oil flow and pressure to drive the tractor at desired speeds.

6. To increase speed forward or reverse, up-shift by slowly moving the lever away from neutral 1/8 now youæ±*e in first gear. Move it another 1/8 youæ±*e in second gear. Continue movement until desired speed or full stroke of lever is attained.
Notice: how speed increases as soon as lever is slightly moved.

7. To decrease speed forward or reverse, downshift by slowly moving the lever toward neutral 1/8? Move another 1/8 and speed is decreased more. Continue movement until desired speed or neutral is attained.
Notice: how speed decreases as soon as lever is slightly moved.

8. When the workload lugs engine RPM down; decrease speed (step 7) until engine returns to full RPM. When workload allows it, increase speed (step 6). (Do not lug engine below 3000 RPM or stall engine)

9. Steiner tractors have 2 transaxles with 2 working ranges; low (1) = 0 to approximately 4.4 MPH forward, and high (2) = 0 to approximately 8.5 MPH forward. We recommend high (2) for most applications because it has a broader band of speed options. However there are operations that warrant the use of low (1) so the operator has more precise control of the tractorç—´ speed.

10. To shift transaxles, forward/reverse lever must be in neutral and tractor must be on level surface.

11. When shifting the tractor into low (1) or high (2) range, both transaxles need to be shifted and locked in the same range.

12. Do not tow tractor with transaxles locked in low(1) or high(2)
Tow only when both transaxles are in neutral which is between low(1) and high(2)

13. High (2) range: it should be used until recommended engine RPM cannot be maintained in gear 1 or 2 on forward/reverse lever (as described above).

14. Low (1) range: it should be used when very slow ground speed is needed (trenching). When in low (1) range and the forward/reverse lever is constantly held at full or almost full stroke then shift to high (2) range.

15. The soft tires act as shock absorbers. When carrying the attachment on rough terrain slow down to reduce tractor bounce and excessive load on the tractor.