160clc problems. Hydraulic stall.

[Diesel Dave]

See the speed sense solenoid (Y5) valve operation from the manual in screenshot below.
Suggest to monitor the speed sense solenoid signal to the two pump regulators by tee in a guage at the speed solenoid outlet port hose.

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[imgonnadigtochynaa]

Okay. And what should I see in this test? Pilot pressure decreasing as engine rpm pulls down?

 

[Diesel Dave]

Okay. And what should I see in this test? Pilot pressure decreasing as engine rpm pulls down?

As a load on the engine increases, the speed difference between target and actual engine speed becomes less.
The pump and valve controller decreases the voltage to the speed sensing solenoid valve which increases the speed sensing pilot oil pressure to the load piston.

 

[imgonnadigtochynaa]

So the pressure on the gauge should go UP as the voltage goes DOWN?
I should have 28v no load and theoretically 0v at full stall load?

I will get the stuff at the hydraulic shop to do that test.
Today I was able to see codes on the mpdr. Program Again it had every code imaginable. 10 codes in total. I should have wrote them down, the first code was for one of the pressure sensors, so I reverted back to monitor mode to see if it was working, and it was, then back to the fault codes and they were gone?
I'm wondering if I'm having an issue with the PVC controller communicating the fault codes?

 

[Diesel Dave]

If and when the codes return , post them all.

 

[stephenrobinson98741]

Been working on my 160clc
Just went through the whole machine this spring, used it around the shop to dig a bit, and had it working great.
The hydraulics were a bit slow on the main lift at the end of the winter and I did a pump setup as per the manual when we got it back and it has never worked so darn good.
Pulled it into the shop to finish it up, did a few nuts and bolts, went to pull it out, and the hydraulics put a crazy load on the engine.
You can stall it with the main boom, and the dipper. They seem to get real hot real fast.
Oddly enough not at the pump, the pump isn't as hot as the reservoir.
The only other thing was the batteries died before we pulled it in. Not sure what difference that would make.

I plugged it into the mpdr and it shows no codes, and I don't see anything out of the ordinary?
No flashing light on the dash for engine codes.

Sounds like the pumps may be staying at full stroke or the destroke/control circuit isn't working. If it was fine before and suddenly started loading the engine that hard, I'd be checking pilot pressure, pump control solenoids, and any wiring/connectors that may have gotten disturbed while it was in the shop. The fact the tank gets hot fast points to hydraulic oil bypassing somewhere and generating a lot of heat. I'd also verify the pump setup values didn't get lost when the batteries went dead, although I'd expect a code if that happened. No codes makes me lean more toward a hydraulic control issue than an electrical one.

 

[mg2361]

I should have 28v no load and theoretically 0v at full stall load?

Technically no. The voltage varies. You most likely will be reading an average voltage at that moment in time. The speed sense solenoid is a proportional solenoid, and under most conditions, is always activated to some degree.

 

[imgonnadigtochynaa]

Sounds like the pumps may be staying at full stroke or the destroke/control circuit isn't working. If it was fine before and suddenly started loading the engine that hard, I'd be checking pilot pressure, pump control solenoids, and any wiring/connectors that may have gotten disturbed while it was in the shop. The fact the tank gets hot fast points to hydraulic oil bypassing somewhere and generating a lot of heat. I'd also verify the pump setup values didn't get lost when the batteries went dead, although I'd expect a code if that happened. No codes makes me lean more toward a hydraulic control issue than an electrical one.

The pumps definitely stroke and destroke, as they change based on whether or not the solenoids plugged in. I will check the hydraulic output of the solenoid like was mentioned before.
But I'm leaning onto it being an electrical/sensor issue.
We had some welding done on the attachment at the end of the stick when it was inside. Hoping that didn't cause eronious issues with the PVC controller