Drivetrain

[TSB]

I have finally finished reassembly of my '53 Cub and it runs! However, when put in gear when the clutch is released there is a nasty knocking in the gear train? I replaced the throw out bearing with a Steiner bearing type and a new clutch plate but did not replace nor adjust the pressure plate. Can someone tell me what the problem is? I tried to send a video with the knocking noise, but was unsuccessful.

Scot

[Bob McCarty]

The three pressure plate fingers need to be adjusted evenly for either a graphite or Steiner type TOB. Look up through the hand hole and measure to see if one of the fingers is out of adjustment.

Bob

[Smokeycub]

Does the clutch pedal pulsate when you push it in? If so Bob's got you covered. Or is the noise coming from the transmission?

[TSB]

The clutch pedal does not pulsate. Sounds like the clanking noise is in the transmission.

Scot

[John *.?-!.* cub owner]

does it make the noise in neutral also?

[TSB]

There is no noise in neutral. Once the clutch is released and the clanking stops, it is runs fine.
I would like to post the video with the noise, but it doesn't work? It is an AVI file.

Scot

[TSB]

Here is a link to the video with the clanking noise.

http://1drv.ms/1Sdi1WK

Scot

[John *.?-!.* cub owner]

Is there a possibility you got the friction disk reversed? The long part of the hub should be toward the transmission. In addition I would check the bolts holding the finals.

[Smokeycub]

I listened to the video several times and it seems like it makes the noise just you begin to engage the clutch. Can't tell from the video if it's coming from the clutch area or the transmission. It kinda sounds like maybe, just maybe, the new disc is rattling on the input shaft or transmitting a stutter to the transmission. Were there any hot spots on either the flywheel or the pressure plate? That could cause a stutter effect/rattle when engaging the clutch.

[Denny Clayton]

Years ago I had to replace the pilot bushing in the flywheel for a similar situation. It was worn enough that the end of the drive shaft would bang around inside the bushing when the clutch pedal was in. After the pedal was released the hook up of the engine to the drive train was solid. The only thing different from yours was that it would rattle whenever the clutch pedal was down. Yours only seems to rattle as the clutch is engaging.

[challenger]

Back up and review how the tractor ran before you did the most recent work on it. Did the transmission sound OK before the recent work? If it did, it likely is not the tranny, but something in the clutch area where you did the recent work. Does the noise occur when the tractor is in neutral and you engage and disengage the clutch or does it occur only when the tractor is in gear?

[TSB]

The tractor ran fine before I completely disassembled it to replace the gaskets and seals. There were no problems with the transmission or the clutch. I did not take the trans. apart except to replace the seals and replace the PTO shaft. As I said before, I replaced the TOB and the clutch disc. I didn't replace the pressure plate nor make any adjustments to it since it worked well before. The PTO works fine and there is no noise when the PTO is engaged when the trans is not in gear. I am pretty sure that the disc is on correctly although it is difficult to see. It seems like when in gear and the clutch is released that it grabs rather than slips until the tractor is in motion. I can't figure out what would cause this and it would appear from those of you trying to help me that you have not seen this same problem before. I really don't want to split the tractor until I can figure out what is causing the problem.

[Bill Hudson]

... I replaced the TOB and the clutch disc. I didn't replace the pressure plate nor make any adjustments to it since it worked well before. ...

You did not mention adjusting the clutch free travel. Replacing the TOB and clutch disc will change the clutch free travel. A new clutch disc will alter the height of the pressure plate fingers, necessitating adjusting the fingers after the clutch disc and pressure plate are installed on the flywheel. My gut tells me that another split may be in your near future.

Good luck.

Bill

[robertst]

What about the front seal in the transmission,if it was replaced could have replaced it backwards letting input shaft move back and forth,Just a thought,LOL

[Smokeycub]

Were there any hot spots on either the flywheel or the pressure plate? That could cause a stutter effect/rattle when engaging the clutch.

I still think the problem is either the pressure plate and/or flywheel. High spots or hot spots can make the clutch "grabby" and the drivetrain will buck slightly when engaging. It could wear in after a while but it may take a long while depending on use.