1650 Transmission noise? Maybe

[oliveracres]

Just got a 1650 a few weeks ago. The chain coupler on it was loose which is no big deal but seems to be getting quite a bit looser as I use it around the place for little projects. Anyway, yesterday I was greasing it and going to move it around to wash it and when I went around the yard it started to whine in the transmission at about 1/2 throttle and then a sound like a a chain missing cogs every so often. At full throttle you get no noise and at idle you get nothing. Only at 1/2. The only thing I did do was squirt 3 pumps of grease for the throwout bearing. I made sure the hydraulics were full and the transmission was only about 2 quarts low which wasn't too bad I didn't think. It sounds like it is coming from the forward of the transmission but I'm now wondering if it is in the Chain coupler and if the gear is not catching the chain all the time or staying on the teeth. It is pretty loose and hanging more than it was a few weeks ago. I'm not too enthused about going into the transmission but I will if need be. Doesn't matter on the problem if I've got it in gear or not. Hard to diagnose this way but wondering if someone has had any experience like this. It has an over under if that matters.

 

[Shep VA]

Hmmmm, makes me wonder if the chain sprocket on the transmission side is jumping teeth on the transmission input shaft.

I would take the chain off and see how much back and forth play there is on the transmission side sprocket and maybe slide the sprocket around and see what the condition of the teeth are.

I would do some more looking at the chain coupler and sprockets and see if you can find anything.

 

[oliveracres]

I haven't got the books for this tractor yet but if the noise is in the transmission would there be a chain drive in there? Maybe a chain driving a pump or something. My main concern is the whine that is associated with the chain noise. My thought was if a bearing on a pump went out and is siezing maybe causing a chain to jump on a gear. Just all thoughts since I've not had one of these opened up before. Thanks in advance.

 

[rrlund]

This isn't likely given the symptoms,but I wonder if the splines are going out on the PTO long shaft up in the hub in the flywheel? When the one on my 1550 went,it pretty much went all at once,but I suppose it COULD slip and skip for a little bit before it goes completely. When mine went,it sounded like the noise was in the hydra power unit.
When the chain coupler went to crap on it,I was raking hay and it made a heck of a clunking noise when it skipped. A pin came out of it and I lost some rollers though. I put the pin back in,but with those few rollers missing,it made a heck of a noise.

 

[Jordan Bergsma]

(quoted from post at 12:41:16 06/01/10) I haven't got the books for this tractor yet but if the noise is in the transmission would there be a chain drive in there? Maybe a chain driving a pump or something. My main concern is the whine that is associated with the chain noise. My thought was if a bearing on a pump went out and is siezing maybe causing a chain to jump on a gear. Just all thoughts since I've not had one of these opened up before. Thanks in advance.

Aren't the oil pumps chain driven on those rear-ends?
I know they are on a 4-150 White which uses a 2-105 rear-end.

 

[e]

Betcha it's your brakes. When it's making that noise, lightly step on the brakes and see if it goes away. If that solves the problem, adjust your brakes back to the factory settings (I think the adjustment is in the owners manual).

 

[Anonymous-0]

Does it do it in both ranges, or only high, just in case, it is a good idea to make sure you have oil in the rearend and has oil pressure to lube the low range gear on the input shaft, not saying that is it but check it anyway!

 

[camju]

the pumps are not chain driven

 

[oliveracres]

Going to start with the chain coupler and check the sprockets. It does it in any range. I actually had a 6 foot mower on the back and engaged the PTO and went through the motions again and it didn't change anything. Doesn't matter if it's in gear and in motion or out of gear and stopped or if the clutch is depressed or if the brakes are set or off. Rearend is topped off coming out of sight hole in side. All your ideas have been helpful so keep them coming if you've got any more ideas. I'll post what I find when I pull the chain off. I'm getting a new one coming in the meantime. Thanks.

 

[Anonymous-0]

If it still makes the noise with the clutch depressed, then it sounds more like the PTO drive shaft, it runs all the time. That shaft runs the hydrolic pump off an idoller gear, also runs through hydra power. Not to sure what the problem is! You said you added oil to the hydra power, i'm sure you already know this, but make sure it is ATF as stated on the dipstick, you would be surprized how many I find with hydrolic oil instead! Plus if your chain is so loose, check the sprokets for wear! Could pull the shaft out the back and check for wear and or fileings, just ideas!

 

[J.Wondergem]

You want a nice tight chain on the coupler. Might want to get a new one. There should be an adjustment bolt on the under side of the tractor. Make sure you adjust it so the sprockets are lined up perfect.

 

[oliveracres]

I now think it is in the PTO. I engaged the PTO with the mower on the back and pushed into the forward lock position and with my hand on it the PTO lever jumped back and forth some. The nasty noise happens at right about 1200 to 1300 RPM. I've got a factory shop manual coming for it. I'm doing the chain coupler anyway because it needs it. Can the PTO assembly and such be accessed by taking the PTO housing off the back. I'm sure I'll learn more when the manual gets here but just trying to get an idea what I'll be in for. I'm not an engine guy but I think with the book and some experience from you guys on here I can get it fixed. It was a grinding tractor for 15 years so some PTO issue wouldn't surprise me. Is the chain that runs the pump way inside or near the back? Just glad it's not winter and the first cutting of hay is done. Thanks in advance.

 

[rrlund]

Just take that cast cover off the rear to get to the PTO,yes. That one doesn't have a chain drive on the pump. It's gear driven off the PTO shaft. The shaft runs through a gear,then there's an idler gear on a seperate short shaft in the transmission housing,finally a gear at the top that is splined to the pump.