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JohnF2015
JohnF2015, Small Engine Technician
Category: Small Engine
Satisfied Customers: 1009
Experience:  Owner/Service Technician at S & J Small Engines
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Have a JD 312 lawn tractor with hydrostatic drive and the

Customer Question

Have a JD 312 lawn tractor with hydrostatic drive and the drive shaft from engine to rear end keeps breaking bolts to engine and other parts/
is this due to hydrostatic pump lock up or do I have another problem
Submitted: 1 year ago.
Category: Small Engine
Expert:  JohnF2015 replied 1 year ago.

Hi, my name is***** will be assisting you.

How often is this happening? Does it only happen after the transmission is hot or you have been running for a while? Does it happen every time that you run the machine? What grade of bolt are you putting in it when you replace the broken ones?

Customer: replied 1 year ago.
This happens each time the engine is running/
Bolts are from JD
First time resulted in drive shaft getting bent / replaced
I have restorded this machine and since then this problem arrose
was without use for two years
Expert:  JohnF2015 replied 1 year ago.

This happens under normal use? It is not likely to be the transmission if it was it would not turn at all. Do you notice any vibrations when running that might indicate that the drive shaft is not running straight?

Expert:  JohnF2015 replied 1 year ago.

This happens under normal use? It is not likely to be the transmission if it was it would not turn at all. Do you notice any vibrations when running that might indicate that the drive shaft is not running straight?

Customer: replied 1 year ago.
No it seems to be smooth / drive shaft is straight / removed it to check
was adjusting carb when the thing went boom and bolts were shered
Expert:  JohnF2015 replied 1 year ago.

The shaft is pretty level going back to the transmission? The engine was not switched, raised or lowered?

Expert:  JohnF2015 replied 1 year ago.

Exactly which bolts are breaking? Are you still running the rubber mounts on either end of the drive shaft?

Customer: replied 1 year ago.
No the engine was not changed and shaft seems level.
I'm not the person that worked on tractor/ the tractor and person is in Tennessee / my home place but i'm in Indiana at the moment .
Is there any way that you can talk directly to Shannon and i will pay the extra $18.00 and you can talk directly to him.
He is not at home right now and i left him a message to call me soon as he gets in.
not sure when he will return home today.
will this create a problem?
Customer: replied 1 year ago.
not sure about rubber mounts on end of drive shaft?
Expert:  JohnF2015 replied 1 year ago.

I can talk directly with him. When he gets ready to accept a phone call from me let me know then we can proceed from there.

Customer: replied 1 year ago.
Sounds good and the $18.00 covers the call to him?
i know Shannon wants to find out what the problem is as he is probably sick of looking at it and i would like to get it back running as it was when he got it.
I just wanted to restore the tractor back to its orig new condition
I have all manuals and the orig bill of sale for tractor when purchased on 9/11/1978 ($2625.00) then.
Expert:  JohnF2015 replied 1 year ago.

Yes it would cover the phone call to him. I would just need his number when he is ready to proceed.

Customer: replied 1 year ago.
John
His name is*****
1-***-***-****
Still don't know when he will get back but i ifigure he will be there for diner.
I will call to let them know that you will be calling.
He is there now / 4;01 pm est
Customer: replied 1 year ago.
His name is*****
Customer: replied 1 year ago.
John,
can you make the call now?
Expert:  JohnF2015 replied 1 year ago.

I am sorry I was not able to make that call yesterday, I had to go to a doctors appointment.

I can make that call today, if you let me know when a good time would be.