JD 6430 Draft control over heats tractor

[TheEquineFencer]

You guys are OK! I'd like to help this lady out, she's the type of farmer that's active in the community, with 4H and will go out of her way to help someone. Thanks again!

 

[Zebrafive]

Zebrafive
After I left the JD dealership in '87 I haven't keep abreast of the later JD hyd systems. How does this PFC hyd system compare to Ford's CLLS hyd system?
Thanks,Jim

TxJim,

I am not familiar with the Ford system. I had to learn about the pressure compensated and load sensing when I got my JD 6415. I'd bet the Ford system is just a different name for the same thing.

 

[Zebrafive]

I assumme you don't have a premium 6430. It would say premium on the hood. It is rare for a premium tractor's pfc hydraulic system to overheat. The "standard" 6430 PC sytem is more sensitive. The draft control being turned on should not overheat the hydraulics if everything else is in order. First, be sure the coolant level in the plastic tank is up to the "maximum" line. I have seen some overheat at minimum. The coolant gets an air bubble in the lines going back to the hydraulic cooler if it is too low. Second, make sure none of the coolantt lines going back to the cooler are pinched or kinked. The cooler is on the front of the transmission, just follow the lines to the engine - they go to the engine charge air cooler and engine oil cooler also. Another thing to look for is a pet peeve of mine on the non premium model. #1 scv has a constant-on detent that does not neutralize on it's own. Make sure that lever is not accidently left engaged and holding the system in High pressure "relief" it is not quite the same as a traditional open center system being held in relief, but it does create alot of extra heat and wear and tear on the pump.

Isn't there a thermostat just for the air charge, engine oil, and trans coolers coolant circuit?
Reguarding #1 SCV, is that why on my 6415 there is a lock, to lock the lever in the neutral position only on #1 SCV?
Or why there are locks in the SCV lever slots for "float"

 

[Tx Jim]

TxJim, The standard and premium do not use the same pump. unless it has the upgrade to PFC system. The standard PC system uses a gear pump where the PFC system uses an axial piston pump - very similar to the pump on a hydrostatic transmission.

jd110
All I know is this pump is common to both the 6430 & 6430 Premium AL166639 HYDRAULIC PUMP (45CM3). How does the performance of the PFC system compared to the older closed-center systems?

 

[Tx Jim]

TxJim,

I am not familiar with the Ford system. I had to learn about the pressure compensated and load sensing when I got my JD 6415. I'd bet the Ford system is just a different name for the same thing.

All I know about the Ford CLLS is from owning a Ford 5610 that had it. I can tell you from experience when the breakaway couplers mess up they are a PITA to get working. I hated the CLLS.

 

[Zebrafive]

All I know about the Ford CLLS is from owning a Ford 5610 that had it. I can tell you from experience when the breakaway couplers mess up they are a PITA to get working. I hated the CLLS.

What does CLLS stand for?

 

[Tx Jim]

I got my letters incorrect. It's CCLS(closed center load sensing)

 

[jd110]

Running hot would indicate that when in draft control it is dumping flow some where. Is it possible the draft linkage is not set properly allowing high pressure oil to be dumped to tank via a control orifice or relief valve.

Anyone have a detailed hydraulic schematic of the 3PH controls including the draft control portion.

The draft control is done electronically. There are sensors on lower draft pin/s to sense the load and the computer opens annd closes the same control valves that raise and lower in normal operation. The only reason for extra heat in draft control is that the computer is constantly making adjustments to hitch height which makes the hydraulics work slightly more. I could see temps running a couple of degrees warmer, but not substantially. I do wonder what is being used on the hitch. If something was overloading it, then maybe that could do it.

 

[jd110]

Isn't there a thermostat just for the air charge, engine oil, and trans coolers coolant circuit?
Reguarding #1 SCV, is that why on my 6415 there is a lock, to lock the lever in the neutral position only on #1 SCV?
Or why there are locks in the SCV lever slots for "float"

You are right, there are separate thermostats for the engine and for the "low temp" circuits. I did not realize there was a lock for neutral on only #1. That may be the reason. The only reason for the float lock, is to prevent going into float accidently when pushing lever forward.

 

[jd110]

jd110
All I know is this pump is common to both the 6430 & 6430 Premium AL166639 HYDRAULIC PUMP (45CM3). How does the performance of the PFC system compared to the older closed-center systems?

TxJim, the PFC systems are definitely superior to the closed center systems of the 10, 20, 30, 40, 50, 55, and 60 series tractors. They offer more flow, higher pressures, less parasitic loads, and therefore better fuel economy numbers can be achieved. SInce they are pressure and flow compensated, there are less variation in flow from one scv to another when using functions that require steady flow such as the vacuum motors on modern planters. The only downfall is that they are more complex, so there is more chances of things to go wrong, although they have been very reliable. One of the best improvements is they no longer use the transmission pump as a charge pump for the hydraulics. They now have a separate charge pump that offers even more flow than the main pump. As you remember I am sure, the older systems relied on all return oil from functions to be returned to the main pump for proper operation. The charge pumpp with maybe 10gpm was trying to supply the main pump which was capable of maybe20gpm or more. Gone are the days where a leak in a pto clutch or transmission pack will affect hydraulic functions.