Bern
Well-known Member
- Location
- Mount Vernon, WA
I'm currently working on a 5000 SOS with a slipping complaint in half the gears (R1,1,2,5,6,&9). A quick check of the troubleshooting chart shows the issue to be with the Direct Drive clutch (no surprise there).
Wanting to make this a teachable moment for my students, I recorded a unique pressure test sequence that some of you will likely find interesting. The video link below will show two different tests run through all of the gears: Test #1 shows pressures at all 3 bands. Test #2 shows pressures at band #1/DD clutch, the pump, and the lube circuit. A legend at the lower LH side shows what colors are for what circuits.
It was no surprise to me to see the major loss of pressures whenever band #1/DD clutch was engaged. What did surprise me was that the lube pressure dropped to pretty much zero whenever that same circuit was pressurized. This leads me to wonder why Ford ever abandoned the low lube pressure warning light, because if this tractor had a functioning lamp on it, the owner might have caught this problem earlier. Any thoughts on this? Do you think it was purely a cost saving measure?
Note how the pressures momentarily drop every time a gear change is made. This is because of the various "indirect circuit" clutch packs being engaged, which is completely normal. Since the pressures drop and then come right back up to where they were, that indicates no leakage in clutches 1, 2 or 3, which cannot be directly pressure tested.
Also note how the engine lugs way down from 8th going into 9th, but not from 10th to 9th. I have a theory on that, but I'll let some of you speculate on that one first - I'll let it be a brain teaser. Hint: study the clutch application chart on the RH side.
When viewing the video, click on the double arrow in the upper RH corner to maximize the screen for better clarity.
Pressure Test Video
Wanting to make this a teachable moment for my students, I recorded a unique pressure test sequence that some of you will likely find interesting. The video link below will show two different tests run through all of the gears: Test #1 shows pressures at all 3 bands. Test #2 shows pressures at band #1/DD clutch, the pump, and the lube circuit. A legend at the lower LH side shows what colors are for what circuits.
It was no surprise to me to see the major loss of pressures whenever band #1/DD clutch was engaged. What did surprise me was that the lube pressure dropped to pretty much zero whenever that same circuit was pressurized. This leads me to wonder why Ford ever abandoned the low lube pressure warning light, because if this tractor had a functioning lamp on it, the owner might have caught this problem earlier. Any thoughts on this? Do you think it was purely a cost saving measure?
Note how the pressures momentarily drop every time a gear change is made. This is because of the various "indirect circuit" clutch packs being engaged, which is completely normal. Since the pressures drop and then come right back up to where they were, that indicates no leakage in clutches 1, 2 or 3, which cannot be directly pressure tested.
Also note how the engine lugs way down from 8th going into 9th, but not from 10th to 9th. I have a theory on that, but I'll let some of you speculate on that one first - I'll let it be a brain teaser. Hint: study the clutch application chart on the RH side.
When viewing the video, click on the double arrow in the upper RH corner to maximize the screen for better clarity.
Pressure Test Video