duncan_hardy
New member
- Joined
- Nov 25, 2008
- Messages
- 6
I have a problem engaging the PTO on my 3910. I always get a huge bang as the drive connects and shock loads are transmitted through to the implement.
According to my I&T shop manual there are two types of PTO fitted to my tractor, either independent (in which the PTO is engaged by a dedicated hydraulic PTO clutch) or transmission (in which the PTO is engaged by a splined sleeve on the gearbox shaft ie after the main clutch). Judging by the pictures in the manual, I have the transmission type PTO.
Now, when I engage the PTO with the engine running, there is this dreadful bang. Again, according to the manual, the transmission type PTO is driven off the gearbox input shaft. So the drive should come after the clutch. However if I press the clutch it makes no difference. The clutch is perfectly effective at preventing drive to the wheels (no creep when in gear) but it doesn't seem to disconnect the PTO. Even if I depress the clutch fully for 5 secs, when I engage the PTO there is a huge bang and the drive is carried through to the implement.
I don't understand this. Is the manual wrong? Is my transmission system defective? Or were some models built with a permanently driven PTO input shaft (like an independent PTO) but with a transmission type engagement?
Duncan
According to my I&T shop manual there are two types of PTO fitted to my tractor, either independent (in which the PTO is engaged by a dedicated hydraulic PTO clutch) or transmission (in which the PTO is engaged by a splined sleeve on the gearbox shaft ie after the main clutch). Judging by the pictures in the manual, I have the transmission type PTO.
Now, when I engage the PTO with the engine running, there is this dreadful bang. Again, according to the manual, the transmission type PTO is driven off the gearbox input shaft. So the drive should come after the clutch. However if I press the clutch it makes no difference. The clutch is perfectly effective at preventing drive to the wheels (no creep when in gear) but it doesn't seem to disconnect the PTO. Even if I depress the clutch fully for 5 secs, when I engage the PTO there is a huge bang and the drive is carried through to the implement.
I don't understand this. Is the manual wrong? Is my transmission system defective? Or were some models built with a permanently driven PTO input shaft (like an independent PTO) but with a transmission type engagement?
Duncan