PTO keeps disengaging on 1772

pisces316 · #1 10-02-2016, 04:06 PM

Here's a new one for you guys! The PTO will disengage at random times while mowing. It will reengage, but then will disengage ever more frequently to the point that I give up and put the machine away. This actually has happened a couple of times a couple of months ago, but each time it only occurred once so didn't really think much of it, other than "maybe I knocked the switch". But now it is frequent. Is it a loose wire? Bad switch? Belt too loose? Thanks again to all who help!

J-Mech · #2 10-02-2016, 04:10 PM

Quote:

Originally Posted by pisces316

Here's a new one for you guys! The PTO will disengage at random times while mowing. It will reengage, but then will disengage ever more frequently to the point that I give up and put the machine away. This actually has happened a couple of times a couple of months ago, but each time it only occurred once so didn't really think much of it, other than "maybe I knocked the switch". But now it is frequent. Is it a loose wire? Bad switch? Belt too loose? Thanks again to all who help!

This isn't new for us.... this question gets asked about 10 times a mowing season.

Yes, it could be all the things you listed, except a loose belt. That is unless the PTO is not disengaging and the belt is slipping. In which case you will need to figure out which issue you have. You will have to check each electrical component that has to do with the PTO while it is acting up until you find the issue. With electrical problems, we can advise where to look, but you will have to find and repair the problem. Get out a DVOM and test light and start testing. If you need a wiring diagram, it can be found in the service manual.

FrankF3 · #3 10-02-2016, 07:23 PM

Do you have any of the safety switches such as the reverse or the seat switch jumped out? How are the grounds such as on the reverse relay on the side of the instrument pedestal? On my 1772, i had an intermittent PTO as well. It turned out to be a broken wire. It was at the connector found for the PTO found on top of the cooling fan mounting. With my wife in the operators seat and engaging the clutch, I found if I moved the wires the clutch would disengage. The wires inside the insulation had broken from bouncing around while using the tractor WHILE leaving the insulation intact. One all the strands broke it out intermittently stop working. I ended up getting a new connector from Mouser.com, and recrimping both connectors. it's been rock solid since.

Jibber · #4 10-02-2016, 08:57 PM

I had a similar issue when I first got my 2182. It drove me crazy until I started researching things. It is a low hour machine so I knew it wasn't electrical. There were two issues I found. The main issue was the battery. If you have a bad battery, your pto will constantly disengage. That solved my problem. However, since I was new to the 2182 I didn't realize there was a safety switch in the dash that EVERY time you would put it in reverse the pto would shut off. Very annoying. I fixed that problem quickly. Not sure if the older SGT's had this safety switch, but if not, either charge your battery or buy a new one. Invest in the stronger one with higher CCAs. If you had no prior issues and you haven't replaced your battery in a while I would try this route first. After fixing these two issues I have not had any more issues with the pto shutting off unless I hit a bump and my A** lifts off the seat and the pto shuts off.

J-Mech · #5 10-02-2016, 09:47 PM

Quote:

Originally Posted by Jibber

I had a similar issue when I first got my 2182. It drove me crazy until I started researching things. It is a low hour machine so I knew it wasn't electrical. There were two issues I found. The main issue was the battery. If the battery isn't strong, your pto will constantly disengage. That solved my problem. However, since I was new to the 2182 I didn't realize there was a safety switch in the dash that EVERY time you would put it in reverse the pto would shut off. Very annoying. I fixed that problem quickly. Not sure if the older SGT's had this safety switch, but if not, either charge your battery or buy a new one. Invest in the stronger one with higher CCAs. If you had no prior issues and you haven't replaced your battery in a while I would try this route first. After fixing these two issues I have not had any more issues with the pto shutting off unless I hit a bump and my A** lifts off the seat and the pto shuts off.

As a note to all this: The CCA's of the battery DO NOT affect it when the engine is running. The reason your battery was the issue is because it likely had a bad cell and was drawing too many amps from the charging system. Yes, it was the batteries fault, but not because it was too small. Could also have been that your charging circuit was weak and the battery was bad. A PTO clutch coil only pulls like 3-5 amps when in use.

All machines built after 1981 (I think, may have been '83) had the reverse cut out relay (dash switch on the hydro lever).

Jibber · #6 10-02-2016, 10:20 PM

Quote:

Originally Posted by J-Mech

As a note to all this: The CCA's of the battery DO NOT affect it when the engine is running. The reason your battery was the issue is because it likely had a bad cell and was drawing too many amps from the charging system. Yes, it was the batteries fault, but not because it was too small. Could also have been that your charging circuit was weak and the battery was bad. A PTO clutch coil only pulls like 3-5 amps when in use.

All machines built after 1981 (I think, may have been '83) had the reverse cut out relay (dash switch on the hydro lever).

Yes. Was not saying that the CCA was the issue but was recommending getting a higher CCA (premium) battery instead of a standard battery when replacing it. Makes a difference when starting. Anyway, try a new battery. May fix your problem. When buying a battery, go for the higher CCA battery instead of standard if you have the option. Dont start freaking out over electrical issues before trying a fresh battery. You can always return the battery.

CubDieselFan · #7 10-02-2016, 10:35 PM

I had similar problem, years ago, with a 1572. Finally found the problem in the plug for the rear PTO. I do not have rear PTO so there was a jumper. It is right behind the battery on the 1572 so there was some corrosion in the plug and it would drop enough voltage across the jumper connection to drop out the PTO.

CoRd59 · #8 10-02-2016, 11:02 PM

Quote:

Originally Posted by Jibber

I had a similar issue when I first got my 2182. It drove me crazy until I started researching things. It is a low hour machine so I knew it wasn't electrical. There were two issues I found. The main issue was the battery. If you have a bad battery, your pto will constantly disengage. That solved my problem. However, since I was new to the 2182 I didn't realize there was a safety switch in the dash that EVERY time you would put it in reverse the pto would shut off. Very annoying. I fixed that problem quickly. Not sure if the older SGT's had this safety switch, but if not, either charge your battery or buy a new one. Invest in the stronger one with higher CCAs. If you had no prior issues and you haven't replaced your battery in a while I would try this route first. After fixing these two issues I have not had any more issues with the pto shutting off unless I hit a bump and my A** lifts off the seat and the pto shuts off.

Learn something new everyday. My 2182 does not kick the PTO off if in reserve, or if your butt is not on the seat. I thought that was just the way they were made? Figured it was made before all the safety stuff started.

Now I'm wondering if the previous owner just disabled them.....ummm I will have to look nice time I'm in the shed.

farmall fred · #9 10-03-2016, 10:21 AM

I had the same issue with my 782. The PTO would not re engauge when hot and sometimes would just drop out. What I found out was the air gap was too wide and when everything heated up the coil could not hold it. I adjusted the air gap and have not had a issue since. There are three slots in the clutch to slip a .017 feeler gauge in to check clearance. They are next to the adjusting bolts. to tighten the air gap tighten the bolts a little at a time and check then move to next bolt. To get them all correct you may need to do this more than once. ALSO BEFORE TRYING TO ADJUST SPRAY THE NUTS WITH SOME TYPE OF PENETRATING OIL. You do not want to twist off the studs. Your operators manual should show you the procedure. I know the one for my 782 and 1872 show the procerdue. The 782 manual says .010-.015 air gap but if the clutch drags to increase to .020, the 1872 says .017 air gap. I have always adjusted mine to .017. I am not saying this is your problem but if it is not electrical a good thing to check for and also it cannot hurt to check it. What happens is the outer ring of the clutch cover acts as a pto brake and over time it and the armature wear increasing the air gap. Let us know what you find. Good luck
Tom
Here is a video showing how to adjust.
https://youtu.be/1YvPZMbASCE

pisces316 · #10 10-03-2016, 04:49 PM

Thanks for all the things to look into. Forgot to mention that the safety switch under the seat has been disengaged (almost from day one). Also, the battery should be good, we replaced it 2 years ago, and yes with a higher CCA than the old one. I now think it's probably a wire, and will look into it with all of your suggestions.