Throttle let-down?

   / Throttle let-down? #1  

IrTxRx

Silver Member
Joined
Apr 9, 2004
Messages
249
Location
Central Texas
Tractor
Power Trac 1430
On my new PT (off the UPS trailer with 4 hours) the throttle lever will not stay at full. I would guess that it ends up at 50-60%.

Is 2/3 the happy spot for the Duetz and full is too much?

Is it OK to jam the trottle to full when I need a little extra torque from the wheels (or is this bad for the Duetz)?

Currently, 50% is plenty fast for learning how to operate. Any problem operating the diesel at this level when not mowing?

Will the the lever loosen up with time?
 
   / Throttle let-down? #2  
Ask for a tiny tach for christmas. Best gift I gave myself. My throttle cable setup is a joke. Really a pain in the ... my cable slipped for the longest time.

I run my Deutz at around 2000 to 2200. Puttering around I will just let it do a bit more than idle which is around 1000 with my current setup. 2800 RPM is my max and I only go there occassionally.

Here is a question for the experts. What is the PSI and HP difference between 2500 and 2800. I cannot wait to get the physics lesson from you guys cause it is always not what I think it will be...
 
   / Throttle let-down? #3  
A couple of suggestions:

I like Terry suggestion of keeping the toes of both your feet on the treadle at all times. I find it helps for precision position control, and helps prevent the violent excursions.

Buried in the Eaton or Charlynn technical specifications is a line suggesting that you keep the pressure under 50% for the first 15 hours of using the wheel motors.

Probably not a bad idea to take it easy on the deutz for the first 15 hours either.

The throttle nuts do loosen over time. On my 1445, you need two 9'16ths wrenches to tighten it. PT recommended removing the panel that faces forward, i.e. above the lift arms to get at it. I did it from below, but that route is awkward.

On the diesels, don't lug them, but keep the speed as low as you can and still operate well. You get better mileage and the engines last longer because they aren't screaming along. You'll generate less heat, and keep your oil cooler too (since you aren't pushing the oil around the PTO circuit at high speeds). That said, if I'm doing something tricky on a steep slope, I have the engine cranked up- just like landing a plane, you want full engine power available if you need it suddenly. Half/two thirds is a fine place, if you need that much power. Most diesels that I have worked on suggest not exceeding about 75% of red line. Bear in mind that unlike cars, the "throttle" is really a govenor setting, where you are asking for a particular engine speed. The govenor then applies just enough fuel to get to that and maintain that speed. As you add more load to the engine, the govenor will try to add more fuel until you are at the maximum fuel delivery.

I tend to think of the throttle as more of a request for HP. "How much HP do I need for the task at hand?"

I hope this helps,

Peter


IrTxRx said:
On my new PT (off the UPS trailer with 4 hours) the throttle lever will not stay at full. I would guess that it ends up at 50-60%.

Is 2/3 the happy spot for the Duetz and full is too much?

Is it OK to jam the trottle to full when I need a little extra torque from the wheels (or is this bad for the Duetz)?

Currently, 50% is plenty fast for learning how to operate. Any problem operating the diesel at this level when not mowing?

Will the the lever loosen up with time?
 
   / Throttle let-down? #4  
woodlandfarms said:
Ask for a tiny tach for christmas. Best gift I gave myself. My throttle cable setup is a joke. Really a pain in the ... my cable slipped for the longest time.

I run my Deutz at around 2000 to 2200. Puttering around I will just let it do a bit more than idle which is around 1000 with my current setup. 2800 RPM is my max and I only go there occassionally.

Here is a question for the experts. What is the PSI and HP difference between 2500 and 2800. I cannot wait to get the physics lesson from you guys cause it is always not what I think it will be...


There is some fill in the data type stuff on the Surplus hydraulics web site under Tech Help . It should show the difference if you enter the data correctly.

SURPLUS CENTER TECHNICAL HELP

Don't forget to double the figures for gas ingines.
 
Last edited:
   / Throttle let-down? #5  
J_J said:
There is some fill in the data type stuff on the Surplus hydraulics web site under Tech Help . It should show the difference if you enter the data correctly.

SURPLUS CENTER TECHNICAL HELP


Here are some figures that I worked up for hp required.

5 gpm at 3000 psi = 20 hp
10 gpm at 3000 psi =42 hp


If you have a 45 hp engine, That is the total hp required for all the pumps running.
 
   / Throttle let-down?
  • Thread Starter
#7  
ponytug said:
A couple of suggestions:


Probably not a bad idea to take it easy on the deutz for the first 15 hours either.

The throttle nuts do loosen over time. On my 1445, you need two 9'16ths wrenches to tighten it. PT recommended removing the panel that faces forward, i.e. above the lift arms to get at it. I did it from below, but that route is awkward.

On the diesels, don't lug them, but keep the speed as low as you can and still operate well.
Peter


I thought you said 5 hours in earlier post... but OK, (really slower is fine for me right now while on the low part of the learning curve)

Don't lug... OOPS, still hard to overcome the impulse to put the pedal to the metal when you need more torque. My brain seems hardwired incorrectly for the PT power curve. Time on tractor will cure though, I expect

One thing that I love about this is my 2 neighbors who only saw it on the trailor are already JEALOUS!!! Gotta luvit
 
   / Throttle let-down? #8  
My Bad! It is five hours- pays to double check everything.

You'll get the hang of the Deutz and the PT pretty quickly. It is a powerful system, and you will get the hang of how much you need when.

I find the two foot routine very helpful to not lugging the engine and for fine positioning, but YMMV.

All the best,

Peter

IrTxRx said:
I thought you said 5 hours in earlier post... but OK, (really slower is fine for me right now while on the low part of the learning curve)

Don't lug... OOPS, still hard to overcome the impulse to put the pedal to the metal when you need more torque. My brain seems hardwired incorrectly for the PT power curve. Time on tractor will cure though, I expect

One thing that I love about this is my 2 neighbors who only saw it on the trailor are already JEALOUS!!! Gotta luvit
 
   / Throttle let-down?
  • Thread Starter
#9  
ponytug said:
My Bad! It is five hours- pays to double check everything.

Peter


Then look out world 'cause it's time to do some SHREDDIN'
 

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