Combines Its not the pump

[CNHTEK]

Is it only the header lift that is sluggishIJ or are all systems the same, including the steeringIJ If all are the same, including the steering, I would say that the priority valve is leaking internally. If all are the same but the steering is normal. I would check the master valve, which is the bottom slice of the valve stack. and if it is only the header lift, I would check the valves in the apropriate valve slice. While looking at it, get someone to engage one of the functions and see if a screwdriver will stick to the solenoid when engaged. It could be an electrical problem, a weak solenoid or a blown diode. It could also be just a weak releif valve or a severely scored seat on the releif valve.

 

[Shane_IN]

I am not sure really. Steering seems ok and the reel lift seems ok even at idle as does the auger but it is really hard to tell. I do know that after the oil is warm at bare idle it will barely lift the header but if cold it will lift really fast. After oil is warm even throttled up it isn't near as fast as cold and it used to be fast all the time. I need to check the pump output. Do you T into the lines or just unhook them and put the gauge onIJ Thanks for the feedback. Shane

 

[tv140]

Sounds like the only problem is in the header lift circuit. You can check the secondary circuit pressure by simply plugging a gauge into the reel lift coupler by the step. See what the pressure is - I think spec was something like 2400psi. I usually turn them up to about 2600psi. What type _ size of head are you trying to liftIJ Could be a bad cartridge or excessive leakage in the head lift valve section. To test the pump output, Take the pressure line off of the pump and install a flow meter in series, reattach the existing line to the output of the flowmeter. Fire it up and load the pump with the needle valve on the flowmeter and observe what is going on.

 

[Shane_IN]

I can't say it is only the header lift circuit but it may be. I need to just get the pump pressure checked to rule it out first! Hate to make a simple thing complicated. It is possible that both pumps are weak. I took the one off our other combine and it does work but like the first when the oil is warm it will slowly pick up the 20' header when it used to pick it up quick even at idle. Now it has to be throttled up just a bit to get her up and when the oil is cold it will pick it up fast at idle. So it may just be both pumps are going. Unfortunately I don't have a set of gauges so I must get someone out here to check them. Thanks for all the help fellas!

 

[CNHTEK]

The couplers right under the ladder won't have anything to so with the lift hydraulics. They only run the pick up drive from the pump under the right hand sheild, just under the valve stack. The main pump beside the engine runs all of the lift hydraulics. So yeah, it would likely be a good idea to get someone to check the max slow and pressure of the main pump, but if the pick up is driving normally, there is nothing wrong with the auxillary hydraulics. If you do happen to find a flow meter and test it yourself, hook it in serries with the pressure side of the pump, like tv140 said. then load the pump to check for specified pressure, but DO NOT dead head the hydraulic flow from the pump or it will destroy itself. That particular gear pump has no internal releif valve, so it will break the casting if the flow is stopped. Under the specified pressure, the pump should not lose more than 15% of its max flow.

 

[AAPIII]

If you plug the pressure gauge into the REEl lift coupler and hold the reel lift swicth in the raise postion that will tell you the releif valve pressure(2250psi +_- 100 as per service man.),just done it yesterday on mine. having same problem, and so far most everyone I have talked to says that it is most likley a "o"-ring in the master valve. I still can run with it this way so I am not going to take anything apart untill it stops all together or it rains.

 

[Shane_IN]

I assume you mean the master valve in the stack, the bottom one. In my case I don't have an O-ring but a blue ring that goes around the relief valve. Not sure what is wrong but getting the pump flow checked is the first thing to check. Mine too works but I don't want it to just take a crap on me and have to wait for a new pump!

 

[AAPIII]

not the relief valve, but the spool itself. I can't afford to stop now to many customers waiting. I allready chekced my pump so I am not worried about it. supposed to rain on thursday, will check it out then and let you know what I find.

 

[Shane_IN]

Is that behind the relief valveIJ Sounds like we may have the same problem! Just glad it works and hasn't completely given out! How are yields for yaIJ Running 46 bpa on light sand here, very surprising!

 

[AAPIII]

I haven't pulled it apart yet, but I beleive it is behind that plug on the front of the valve. Done some of my beans yesterday, from 8 to 45 bpa These where no-till into corn stalks in 30in rows, and that is how all the others have been also, small beans with low bushel weight, just like last year. (Cen. Wis.)