materials_engineer
New User
Was mowing hay with my 2594 and slowly noticed it losing speed last year. As it lost speed began to hear a whining sound coming from right beneath me. The slower it got the louder and faster the whining got. Slipped more at an idle than at higher RPM, you can make it stop moving at an idle with the brakes pushed. Did it in all gears, all ranges. Powershift shifts fine, no delays, no hard shifts.
Split it in two 3 weeks ago, put new torque limiter friction disks in even though the disks in it didn't look burnt or worn. Followed the service manual, springs toward the flywheel on the first disk, springs toward the back on the second disk. Pressure plates look ok, they are very smooth where the clutch disks have been, same with the flywheel. The surface texture on the flywheel is gone where the friction disks press to it, its completely smooth whereas the rest of the flywheel has a texture to it. Belleville spring measured out in tolerance according to the service manual. Put it back together with new filters, still slipping. It was def better than before but still slipping when pulling, still slips less at higher RPM and more at lower RPM. Same whining noise that gets louder and faster the longer it slips and goes away as it picks up speed. Checked pressure to the hydraulic pump from the transfer pump it was good, pressure to the c1-c6 clutches was good. Went through all the electronics on the solenoids, proper solenoids energizing when in the different ranges. Cleaned the spool to the torque limiter nothing out of the ordinary there. Cable looks adjusted, spool is bottoming out like its supposed to. Popped the PTO housing off and checked the sump screen, it was fairly clean didn't take much effort to clean it. No large chunks of metal or pieces floating anywhere in the belly, just normal metallic flake from a 10,000 hour tractor.
Put the PTO housing back on, still slipping for 5 minutes or so I ran it around the shop. I stomped down on the brakes hard to see if it would stop moving completely at a higher rpm and it suddenly lunged forward and stopped whining completely. For an hour it ran fine, proper speed no slipping no whining even at super low rpm pulling a steep hill. After 30 minutes it started again. Split the tractor again, clutch packs look the same, don't look burnt, I can see some minor evidence of them slipping on one of the pressure plates.
I'm out of ideas on things to check. Only thing I came up with today was possibly the flywheel texture being gone but that seems like a stretch. Anyone else ever hear of something like this? Thanks.
Split it in two 3 weeks ago, put new torque limiter friction disks in even though the disks in it didn't look burnt or worn. Followed the service manual, springs toward the flywheel on the first disk, springs toward the back on the second disk. Pressure plates look ok, they are very smooth where the clutch disks have been, same with the flywheel. The surface texture on the flywheel is gone where the friction disks press to it, its completely smooth whereas the rest of the flywheel has a texture to it. Belleville spring measured out in tolerance according to the service manual. Put it back together with new filters, still slipping. It was def better than before but still slipping when pulling, still slips less at higher RPM and more at lower RPM. Same whining noise that gets louder and faster the longer it slips and goes away as it picks up speed. Checked pressure to the hydraulic pump from the transfer pump it was good, pressure to the c1-c6 clutches was good. Went through all the electronics on the solenoids, proper solenoids energizing when in the different ranges. Cleaned the spool to the torque limiter nothing out of the ordinary there. Cable looks adjusted, spool is bottoming out like its supposed to. Popped the PTO housing off and checked the sump screen, it was fairly clean didn't take much effort to clean it. No large chunks of metal or pieces floating anywhere in the belly, just normal metallic flake from a 10,000 hour tractor.
Put the PTO housing back on, still slipping for 5 minutes or so I ran it around the shop. I stomped down on the brakes hard to see if it would stop moving completely at a higher rpm and it suddenly lunged forward and stopped whining completely. For an hour it ran fine, proper speed no slipping no whining even at super low rpm pulling a steep hill. After 30 minutes it started again. Split the tractor again, clutch packs look the same, don't look burnt, I can see some minor evidence of them slipping on one of the pressure plates.
I'm out of ideas on things to check. Only thing I came up with today was possibly the flywheel texture being gone but that seems like a stretch. Anyone else ever hear of something like this? Thanks.