TW15 transmission knock

[Mccloy_Farms]

So recently I started up the tw and heard a knock coming from below my feet in the cab. I crawled down under the tractor to listen and there is a knock coming from the front transmission. I've learned and tested that this knock rithm increases as rpm increased, and it is faster when dual power is on the rabbit side. It doesn't matter if I'm in gear or not, only if the clutch is engaged or disengaged. When engage it makes the knocking sound, when disengaged it stops. When driving downhill it sounds really bad when uphill it goes back to its normal rithm. Hoping it isn't a huge problem and an easy fix. Probably not. Also, what is the cotter pin under the transmission our john deere 2950 has one as well. Thank you.

 

[Emiel]

Hi, not an expert myself but it sounds like a dual power problem.

The cotter pin is there to keep a weep hole from plugging up with dirt. If a crankcase or transmission seal leaks it is there to let the oil out instead of lubing the clutch.

 

[Bern]

So recently I started up the tw and heard a knock coming from below my feet in the cab. I crawled down under the tractor to listen and there is a knock coming from the front transmission. I've learned and tested that this knock rithm increases as rpm increased, and it is faster when dual power is on the rabbit side. It doesn't matter if I'm in gear or not, only if the clutch is engaged or disengaged. When engage it makes the knocking sound, when disengaged it stops. When driving downhill it sounds really bad when uphill it goes back to its normal rithm. Hoping it isn't a huge problem and an easy fix. Probably not. Also, what is the cotter pin under the transmission our john deere 2950 has one as well. Thank you.

Noises like this are next to impossible to diagnose over the internet, however I'd start by draining your transmission fluid into a clean white bucket and see if anything foreign comes out. If nothing, I would then remove the shift cover assy on the RH side of the case and inspect the magnet. If you still come up empty, I would then remove the top cover and visually inspect all of the gear teeth for anything unusual like a bent tooth. While there, grab the shafts and check for any unusual end play or up and down movement, which would indicate a bearing failure.

The fact that the rhythm increases when you shift the dual power into high range does not peg the problem as being in the dual power because when you shift it into high range you're simply spinning the main transmission faster. All that said, those transmissions are fairly rugged and reliable, so I would not jump to conclusions too quickly.

 

[Mccloy_Farms]

Noises like this are next to impossible to diagnose over the internet, however I'd start by draining your transmission fluid into a clean white bucket and see if anything foreign comes out. If nothing, I would then remove the shift cover assy on the RH side of the case and inspect the magnet. If you still come up empty, I would then remove the top cover and visually inspect all of the gear teeth for anything unusual like a bent tooth. While there, grab the shafts and check for any unusual end play or up and down movement, which would indicate a bearing failure.

The fact that the rhythm increases when you shift the dual power into high range does not peg the problem as being in the dual power because when you shift it into high range you're simply spinning the main transmission faster. All that said, those transmissions are fairly rugged and reliable, so I would not jump to conclusions too quickly.

Okay. I will check that out and do some investigating. Thanks Bern

 

[Mccloy_Farms]

So, I drained some fluid out of the main tranny which I believe is the one that connects to the engine. I stuck my finger up in the drain hole, and felt chunks. I pulled out a piece around 3in long. It was sheared and bent I belive. I will link a picture to this post. Any idea what it is? The oil was metallic too which didn't surprise me after I pulled those pieces out. Can I rebuild this transmission without taking off the cab? Just splitting the tractor?

 

[Bern]

So, I drained some fluid out of the main tranny which I believe is the one that connects to the engine. I stuck my finger up in the drain hole, and felt chunks. I pulled out a piece around 3in long. It was sheared and bent I belive. I will link a picture to this post. Any idea what it is? The oil was metallic too which didn't surprise me after I pulled those pieces out. Can I rebuild this transmission without taking off the cab? Just splitting the tractor? View attachment 92084

It doesn't matter at this point what the piece is, you are looking at a transmission teardown. Yes, the transmission can be removed without removing the cab. I support the front of the cab and roll out the engine and trans as a unit. The trans can then easily be removed off of the engine.