knocking noise

[TimberHole]

Have you put a stethoscope on the engine while it’s making the sound. Often times I can isolate an issue using that technique.

Amazon.com: Lisle 525 Mechanic's Stethoscope: Automotive

 

[ptsg]

It might be the same "knocking" sound I have after all. To me, the sound seems to come from the bell housing area, but still hard to be 100%.

I was checking the service manual. While the Branson HST models doesn't have a clutch, they do have a damper. So it might be just the springs making noise.

Mine has the dumper built in on the clutch, like most clutches. but the HST models, only use the damper.

HST:

Gear:

 

[K5lwq]

Have you put a stethoscope on the engine while it痴 making the sound. Often times I can isolate an issue using that technique.

Amazon.com: Lisle 525 Mechanic's Stethoscope: Automotive

+1 on this!

I agree with Scotty, now it is even more of mystery to me. It very well may be coming from the bell housing area but at one point I was suspecting a pulley noise.

Ptsg, you probably have the best shot of getting this one correct. I have not noticed that sound on mine yet but it could be because of the Cab. I will run it some this weekend and will see if I can duplicate it walking around the tractor.

 

[ruffdog]

Have you put a stethoscope on the engine while it’s making the sound. Often times I can isolate an issue using that technique.

Amazon.com: Lisle 525 Mechanic's Stethoscope: Automotive

You can use a piece of hose too. I use a 3/8 ID hose a few feet long and put one end to your ear and listen with the other end. Put a ear plug in your other ear to limit hearing surrounding noise.

 

[bindian]

Have you put a stethoscope on the engine while it’s making the sound. Often times I can isolate an issue using that technique.

Amazon.com: Lisle 525 Mechanic's Stethoscope: Automotive

I use a two foot long straight slot screwdriver.
hugs, Brandi

 

[Wagtail]

I use a two foot long straight slot screwdriver.
hugs, Brandi

That's one of the 'tricks of the trade' that I learnt in the Navy... I was hesitant to mention it here for fear of being called 'mad'.

You put the blade on what you want to listen to, the handle into your ear and 'plug' the other ear with your finger. It works... especially in confined spaces.

 

[ElCreative]

My 2515h was experiencing the same and I worked it until one day it completely lost power. This happened at about 50-60 hours.

It smoked like crazy and I could barely get it onto the trailer to take to the dealer. Turns out it was a bad valve and I had a new cylinder head and gaskets replaced. Picture of everything they replaced attached.

After about 2-3 weeks I got it back. Power restored, drives fine but I definitely still hear a slight knock still. I reached out to the dealer again and they said to just continue working it. The response was that the 2515 has a slight rattle as compared to the 3015 or larger. .

 

[K5lwq]

My 2515h was experiencing the same and I worked it until one day it completely lost power. This happened at about 50-60 hours.

It smoked like crazy and I could barely get it onto the trailer to take to the dealer. Turns out it was a bad valve and I had a new cylinder head and gaskets replaced. Picture of everything they replaced attached.

After about 2-3 weeks I got it back. Power restored, drives fine but I definitely still hear a slight knock still. I reached out to the dealer again and they said to just continue working it. The response was that the 2515 has a slight rattle as compared to the 3015 or larger. . View attachment 665579

First of all, Welcome to TBN and thank you for sharing your experiences. I hope you continue to share.

Would you say the noise you are hearing now is different than before you experienced the failure?

 

[ElCreative]

First of all, Welcome to TBN and thank you for sharing your experiences. I hope you continue to share.

Would you say the noise you are hearing now is different than before you experienced the failure?

Thanks.

The noise I’m hearing now is different. Not as consistent. The knock was more pronounced before and now it’s almost more of a rattle at idling RPMs. I don’t really hear it at higher RPMs. Here is what it sounds like now. Kind of hard to hear though like this...

youtu.be/z0t7d_18m-k

 

[bindian]

That's one of the 'tricks of the trade' that I learnt in the Navy... I was hesitant to mention it here for fear of being called 'mad'.

You put the blade on what you want to listen to, the handle into your ear and 'plug' the other ear with your finger. It works... especially in confined spaces.

No problem. I'll be the "mad" one here. The screwdriver is great for getting in near moving pulleys and belts.

Have you ever used two mirrors, out in the sunlight, to shine light into a dark spot on an engine? My first boss taught me to do it out on the ramp while running up engines. The second mirror really lights it up better than a flashlight.
hugs, Brandi