pmsmechanic
Elite Member
- Joined
- Dec 6, 2013
- Messages
- 4,372
- Location
- Southern Alberta, Canada
- Tractor
- 4410 and F-935 John Deere, MF 245
The only time a small square baler pounds is when you feed it to maximum capacity.
I dont understand my PTO and how it is supposed to work...
- Thread starter Texwing
- Start date
- Views: 13781
The only time a small square baler pounds is when you feed it to maximum capacity.
RoyJackson
Rest in Peace
- Joined
- Nov 17, 2001
- Messages
- 24,646
- Location
- Bethel, Vermont
- Tractor
- John Deere 4052R Cab,, Deere 855D UTV, Z920A Zero Turn Mower and assorted implements
That's definitely the way to go...engagement of the PTO is a bit of a shock load...disengagement is too, but less so. Lower RPM reduces the shock load and will also extend the life of the PTO brake.
I don't know anything about balers, so I don't know how accurate Rob's first comment is...but those 4xxx series Deeres are pretty tough machines.
aczlan
Good Morning
- Joined
- Mar 7, 2008
- Messages
- 17,540
- Tractor
- Kubota L3830GST, B7500HST, BX2660. Formerly: Case 480F LL, David Brown 880UE
I agree. We run a baler with our Kubota L3830 and it has been fine so far. Just start at a low engine speed (just high enough to handle starting to spin it up without lugging) and idle down before you shut it off.
Aaron Z
CLinton_in_FL
Silver Member
To get back to how it works, your switch turns on a valve that provides hydraulic pressure to a clutch pack which engages the PTO. so it is not "direct drive". I in the manual, or in at least mine for a 4310, they ask you to engage the pto at idle, and rev the engine up to pto speed. same with disengaging it. idle the engine down, and then cut off the pto. The pto will spin for a little bit, but then stop. with the engine off, you should only be able to turn the pto 180 degrees before it stops. this is the "brake" they are talking about.
Ok thanks that is helpful and makes sense, but the operator manual does say to run her up to 2700/540pto and hit the switch, which seems stupid unless its hard on the engine otherwise. On my other tractor i can just feather the clutch to get it all going. So, I take it the clutch is going to slip somewhat to get it going, and somewhat to get it stopped. Here is what i am trying to get: With the pto engaged, at 540rpm, if i pull back on the power down to idle, then the pto will just freewheel and wind down, but when i disengage the pto, thats when the brake comes into play? When you say the PTO will "spin for a little bit" does that mean 10 seconds or so while the brake gently slows it down, or is it more like a just a few revolutions? I will have to post an emergency shut down procedure on the dash! :O) I generally feel blessed every time the old baler throws another out, and really dont want to experiment on it. thanks for all the help.
buickanddeere
Super Member
Relax. You are worrying yourself into a dither over nothing. Just rev the engine enough that the pto driveline does not shudder when the pto is engaged. If it's a small square baler the pto can be shut off at any rpm. if there is a high inertia pto load such as a generator or rotary cutter. Idle the engine back to lowest rpms then disengage the pto.
Ok I am starting to Relax. Part of this is just trying to get a definitive explanation on how it works, but i think i am there, thanks for the help.
CobyRupert
Super Member
If yours does, you can turn off the PTO at any rpm without any effect on the tractor.
It's hard to imagine a tractor that can brake (break!) a high inertia load on the PTO. Seems like it would create a tremendous amount of heat somewhere.
DK35vince
Super Member
I don't believe the PTO brake is really meant to quickly stop high inertia loads.
PTO brakes are used mostly on independent PTO models. Oil film between the disc's in the PTO clutch can cause the PTO to slowly turn when in the off position.
The PTO brakes keeps the PTO from turning when off.
I really dont know if my 1971 NH 277 Bales has an overrunning clutch built in-I have spun that flywheel both directions by hand many a time and dont recall that it does, it does however have shear pins. I to have doubts about any kind of brake on a "high inertia load" and the comments about idling it down and then turing the pto off are good, but that baler will spin for a long time to wind down (good bearings i hope, and same with brush hog), so the prospect of waiting around in certain situations for this stuff to wind down before turning off PTO is a little goofy. I think its just time for experimenting. I dont think deere would build anything that would be an issue like this.
