Hi all,
Our JD 2140 is suffering the dreaded hydraulic shakes.... lift arms judder, stiff steering, loader and remote cylinders all tremble when the main pump runs dry. Revving right up usually sorts the steering, but loader and running anything on the remotes is a headache. As expected she's worse when hot due to thinner oil, but the problem is evident when cold. It doesn't drop out of PTO, 4WD or HiLo what so ever. When warm it's a nightmare to shift to high, but once in, it'll stay in. Basically, it's all good until the front oil tank runs dry and the main pump begins to cavitate.
Looking towards the transmission pump....
Filters changed, also checked filter bypass valve, steering priority and surge relief which are all good. Transmission pump suction screen relatively clean (apart from bits of clutch plate). When I checked the 2 stage pressure reg valve in the transmission cover I noticed the outer spring measures 124mm as opposed to JD's stated 129mm which will affect valve opening pressure... this will be replaced.
Next, I checked the flow on the feed to the main pump which was between 0lpm and around 20lpm (Should be 54lpm - 15lpm for the hilo)
So, we split the tractor before the transmission, then at the bell housing taking the whole casting out (Doing the clutch while we're at it).
None of the internal steel pipes are split / cracked and the O-rings don't look too bad. I've stripped out and pulled apart the transmission pump, HiLo, PTO and 4WD clutches. The HiLo friction plates are in a real mess, there's no 'frodo' material on them. At least that explains why selecting hi when warm was a nightmare.
None of the clutch pack plates look too clever, so they'll all be changed along with seals, O-rings etc.
Few questions below if anyone can help:
1. Could the lack of material on the HiLo selector clutch plates cause the piston to push out excessively leading to oil running past the piston ring and to sump? Thus, partly contributing to the starvation of the main pump?
2. I also noticed the spacer in the 4WD clutch which stood out (JD P/N: L38692). There is a recess that looks to be worn into one side leaving a small lip for the clutch plate to sit. I can't tell if this is machined or serious wear. Does anyone have any experience with this? (see attached pics)
3. Pinion gear (JD P/N: AL28751) from the HiLo clutch looks worn inside. It almost looks like a weld on the inside outer with head ground off. (see pic) It may be nothing, it may be something.
4. Transmission pump gears have a little scouring, nothing major. Will replace as it's out. But any thoughts appreciated (see pics).
I just want to be sure I've covered everything while it's apart. Clutch packs I'm not worried about as all wearing parts will be changed. But I want to make sure I've cured the hydraulic issue. Moving bales is a nightmare! Once it's back together it ain't coming apart again!
Thanks in advance
Our JD 2140 is suffering the dreaded hydraulic shakes.... lift arms judder, stiff steering, loader and remote cylinders all tremble when the main pump runs dry. Revving right up usually sorts the steering, but loader and running anything on the remotes is a headache. As expected she's worse when hot due to thinner oil, but the problem is evident when cold. It doesn't drop out of PTO, 4WD or HiLo what so ever. When warm it's a nightmare to shift to high, but once in, it'll stay in. Basically, it's all good until the front oil tank runs dry and the main pump begins to cavitate.
Looking towards the transmission pump....
Filters changed, also checked filter bypass valve, steering priority and surge relief which are all good. Transmission pump suction screen relatively clean (apart from bits of clutch plate). When I checked the 2 stage pressure reg valve in the transmission cover I noticed the outer spring measures 124mm as opposed to JD's stated 129mm which will affect valve opening pressure... this will be replaced.
Next, I checked the flow on the feed to the main pump which was between 0lpm and around 20lpm (Should be 54lpm - 15lpm for the hilo)
So, we split the tractor before the transmission, then at the bell housing taking the whole casting out (Doing the clutch while we're at it).
None of the internal steel pipes are split / cracked and the O-rings don't look too bad. I've stripped out and pulled apart the transmission pump, HiLo, PTO and 4WD clutches. The HiLo friction plates are in a real mess, there's no 'frodo' material on them. At least that explains why selecting hi when warm was a nightmare.
None of the clutch pack plates look too clever, so they'll all be changed along with seals, O-rings etc.
Few questions below if anyone can help:
1. Could the lack of material on the HiLo selector clutch plates cause the piston to push out excessively leading to oil running past the piston ring and to sump? Thus, partly contributing to the starvation of the main pump?
2. I also noticed the spacer in the 4WD clutch which stood out (JD P/N: L38692). There is a recess that looks to be worn into one side leaving a small lip for the clutch plate to sit. I can't tell if this is machined or serious wear. Does anyone have any experience with this? (see attached pics)
3. Pinion gear (JD P/N: AL28751) from the HiLo clutch looks worn inside. It almost looks like a weld on the inside outer with head ground off. (see pic) It may be nothing, it may be something.
4. Transmission pump gears have a little scouring, nothing major. Will replace as it's out. But any thoughts appreciated (see pics).
I just want to be sure I've covered everything while it's apart. Clutch packs I'm not worried about as all wearing parts will be changed. But I want to make sure I've cured the hydraulic issue. Moving bales is a nightmare! Once it's back together it ain't coming apart again!
Thanks in advance
