Looking for some opinions on an issue. Tractor was having an issue with the clutch, sometimes you would have to pump the clutch pedal to get the clutch to disengage so you could put it into gear. Also the clutch pedal would stay on the floor and not return to up position. They diagnosed it and wanted me to put a clutch, pressure plate, master cylinder and slave cylinder w/ throw out bearing in it as well as pilot bearing. I had to put a rear main seal in it anyways for an oil leak.
Took all the old parts to New Holland dealer w/ the SN and all, they gave me the new style slave cylinder and pressure plate with clutch as well a master cylinder and bearing.
Put it all back together, bled the system with the correct LHM fluid from CNH. Same issue nothing changed. When I bleed it I'll get good pressure from the bleeder valve, and then the pedal will stay on the floor and nothing. Doesn't seem like it is acting on the pressure plate as much as it should either. No leaks, no air bubbles, even tried to vac bleed it from both ends.
Split the tractor again and sent the parts back assuming the pressure plate was bad. They called me back and said it should all be correct and to bring my flywheel down and they can check everything with engineering. So that is what I did, they called me back saying everything is within spec. Seems odd to me the pressure plate fingers are setting in towards the flywheel noticeably when its all bolted up.
I set the flywheel, clutch disk, and pressure plate on the trans input shaft. Made a jig that held the flywheel on the input shaft the same distance the crank would. Pumped up the pedal till it had pressure and the pedal would only come back up half way. Blocked off the port from the master cylinder going to the top of the res and used a coolant pressure tester to put 5psi into the master cylinder to get the pedal to raise the rest of the way up. So at this point the slave is up against the pressure plate fingers, there is no slack in the rod without pressure, but holding down the clutch for a short period of time maybe 45 seconds or so the pressure is bleeding off and not disengaging the clutch and the pedal does not return all the way up. Even when the rod is the entire way out, like if i push the save in by hand, the pedal is not holding the rod in, i can move it 1/8 inch or so. So I know the pedal isn't holing the rod back from its max travel.
Looking for someone with experience with these tractors, the issue seems to be alluding all of us over here. Of course it has a massive side boom mower on it blocking the view port for the bellhousing when the tractor is assembled...
Only other thing I can think of is a restriction in the hoses.
New Holland 6640
SN: 081039B
Variante 963230000-12X12 TRANS W/IPTO 540
Clutch 82011591 (CNH)
Pressure plate 82011590 (CNH)
Slave cylinder 47134440 (CNH)
Master cylinder 1101-1550 (Atlantic parts)
Took all the old parts to New Holland dealer w/ the SN and all, they gave me the new style slave cylinder and pressure plate with clutch as well a master cylinder and bearing.
Put it all back together, bled the system with the correct LHM fluid from CNH. Same issue nothing changed. When I bleed it I'll get good pressure from the bleeder valve, and then the pedal will stay on the floor and nothing. Doesn't seem like it is acting on the pressure plate as much as it should either. No leaks, no air bubbles, even tried to vac bleed it from both ends.
Split the tractor again and sent the parts back assuming the pressure plate was bad. They called me back and said it should all be correct and to bring my flywheel down and they can check everything with engineering. So that is what I did, they called me back saying everything is within spec. Seems odd to me the pressure plate fingers are setting in towards the flywheel noticeably when its all bolted up.
I set the flywheel, clutch disk, and pressure plate on the trans input shaft. Made a jig that held the flywheel on the input shaft the same distance the crank would. Pumped up the pedal till it had pressure and the pedal would only come back up half way. Blocked off the port from the master cylinder going to the top of the res and used a coolant pressure tester to put 5psi into the master cylinder to get the pedal to raise the rest of the way up. So at this point the slave is up against the pressure plate fingers, there is no slack in the rod without pressure, but holding down the clutch for a short period of time maybe 45 seconds or so the pressure is bleeding off and not disengaging the clutch and the pedal does not return all the way up. Even when the rod is the entire way out, like if i push the save in by hand, the pedal is not holding the rod in, i can move it 1/8 inch or so. So I know the pedal isn't holing the rod back from its max travel.
Looking for someone with experience with these tractors, the issue seems to be alluding all of us over here. Of course it has a massive side boom mower on it blocking the view port for the bellhousing when the tractor is assembled...
Only other thing I can think of is a restriction in the hoses.
New Holland 6640
SN: 081039B
Variante 963230000-12X12 TRANS W/IPTO 540
Clutch 82011591 (CNH)
Pressure plate 82011590 (CNH)
Slave cylinder 47134440 (CNH)
Master cylinder 1101-1550 (Atlantic parts)
