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'78 312 "Frankentwelve"


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#1 Trav1s OFFLINE  

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Posted August 17, 2015 - 06:21 AM

I decided to split off the info on the '78 312 into this thread.  It has taken a different direction than I anticipated.  

This 312 is quite nice and I think lyall took care of me.  Ok, he was real good to me.  


The '78 312 arrived home and my dad and I could not leave it alone.  Swapped in the good battery from the 120 to see if it would turn over.  It did and it was strong.  Just for giggles we sprayed some MAF cleaner (because that is what I had handy) into the carb but it did not fire.  Checked the points and they were stuck together.  After a bit of cleaning and checking the gaps we had strong spark.  With a bit of gas into the carb thru a hose we cranked it over and it ran.  No smoke or funny sounds.    :D

 

One thing I noticed is that the '78 does not have the front hydro lines but the '77 does.  Also, the input shaft on the pump is bad on the '78 and good on the '77.  Looks like these two will get morphed together into a machine I will call the Frankentwelve.


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#2 Trav1s OFFLINE  

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Posted August 17, 2015 - 01:13 PM

Pics of the input pump damage.

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#3 Trav1s OFFLINE  

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Posted August 17, 2015 - 01:17 PM

Transaxle swap and parts from the other machine that will be leaving. Anyone need 312 parts?

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Edited by Trav1s, August 17, 2015 - 02:10 PM.

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#4 JDBrian OFFLINE  

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Posted August 17, 2015 - 01:30 PM

Ah! That looks so familiar. After doing major work on a 314 and doing a frame up restore of a 317 that all looks familiar to me. The input shafts often get damaged because of problems with the motor mounts. They go to pieces and a lot more movement and vibration is transferred to the input shaft. Nice save on the 312. They are a solid GT with a strong drivetrain. 



#5 Trav1s OFFLINE  

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Posted August 17, 2015 - 02:12 PM

I already appreciate the larger fuel tank under the seat. Still sorting out the driveshaft. Not a great design IMHO. This k301 runs higher than the 120 too - feels real strong with no smoke.

Edited by Trav1s, August 17, 2015 - 02:15 PM.


#6 dodge trucker OFFLINE  

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Posted August 17, 2015 - 05:32 PM

"need parts"  huh?  About 4 years too late for the 312 that I used to have



#7 adamjd200 OFFLINE  

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Posted August 17, 2015 - 05:33 PM

If the one tractor is parts would you sell the seat?  I need one for my 200.



#8 Trav1s OFFLINE  

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Posted August 18, 2015 - 10:59 AM

Brian - I do need to work on one of the motor mounts.  Add that to the list

 

Some facts I discovered about this machine as we worked on it Monday morning

- it us possible to mount a 41 deck with 48 draft arms but you end up with a 4" cutting height  :rolling:

- hydro linkage feels really loose and is still out of adjustment.  This hydro (out of the other 312) is really strong

- Walbro has a stumble from low idle to WOT when cold (Walbro =  :wallbanging: )

- angle grease zerk on steering box came out when I tried to grease it (installed a straight style with a socket to take care of the problem)

- There is a difference between the frame on '77 axle and the '78 axle.  

- Dash pedestal on the '78 will be replaced with the piece from the '77 (and invites me to repaint the tractor  :smilewink: )

- this hydro has type F in it like my 120

 

I also swapped the front tires from the '77 to the '78 it has matching fronts and rears.  The simple things in life make me happy  :bigrofl:


Edited by Trav1s, August 18, 2015 - 11:20 AM.


#9 Trav1s OFFLINE  

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Posted August 18, 2015 - 11:06 AM

If the one tractor is parts would you sell the seat?  I need one for my 200.

 

I removed the seat cushion from it and have stashed the pan for a new cover.  I do have an extra base if you wanted to go the Hapcoparts seat route or you could use your current seat pan.  


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#10 adamjd200 OFFLINE  

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Posted August 18, 2015 - 11:11 AM

I removed the seat cushion from it and have stashed the pan for a new cover.  I do have an extra base if you wanted to go the Hapcoparts seat route or you could use your current seat pan.  

Thanks for replying, I'll get one locally, my pan has rust issues and is unusable.


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#11 Trav1s OFFLINE  

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Posted August 21, 2015 - 08:20 PM

Gave Frankentwelve some attention today before mowing the lawn.  I adjusted the hydro linkage to so that neutral is actually in neutral on the dash then adjusted out creep.  Dropped the deck and installed the correct front draft arms on the mule drive then leveled the deck accordingly with cutting height moving from 4" to 3".  

 

After all of that work, it would not start because of no spark.  I swapped a condenser and coil (from the 120) and all was well once again.  

 

Things I like about the 312 compared to the 120:

- bigger gas tank under the seat

- hydro control on the dash

 

Frustrations with the 312 when compared to the 120:

- huge turning radius and hard to steer (I think my steering tweaks from the 120 would help the 312)

- vibrations in the tractor feel worse on the 312 than the solid mounted engine of the 120


Edited by Trav1s, August 22, 2015 - 09:03 AM.


#12 Trav1s OFFLINE  

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Posted September 02, 2015 - 01:47 PM

Used the 312 on Monday to move gravel from the front flowerbed to the back yard with the 7 cart.  I am putting up a 10'x12' shed (biggest possible without building permit) and I am repurposing the stone from the flowerbeds to be the foundation for the building.  The 312 did great other than it is a bit cranky when it comes to warm temp starts.  I also mowed the yard again with it.  All in all a great machine but there is something about my 120 that keeps me coming back.  My original intent was to use the 312 to remove snow and the 120 for cutting grass.  I am sticking to that plan at this time. 

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Edited by Trav1s, September 02, 2015 - 02:05 PM.


#13 hdg4400 OFFLINE  

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Posted September 02, 2015 - 05:03 PM

Trav1s:

 

Following and enjoying your "Frankentwelve" thread, but couldn't resist replying that I built my shed a little under 10x12 for the same reason, no building permit needed. Here is a picture of mine.

 

IMG_1074.JPG

 

Maybe not really right for a Garden Tractor forum, but would love to see pictures of the building process, or at least of the finished product.

 

 


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#14 Trav1s OFFLINE  

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Posted September 02, 2015 - 05:19 PM

Trav1s:

 

Following and enjoying your "Frankentwelve" thread, but couldn't resist replying that I built my shed a little under 10x12 for the same reason, no building permit needed. Here is a picture of mine.

 

attachicon.gifIMG_1074.JPG

 

Maybe not really right for a Garden Tractor forum, but would love to see pictures of the building process, or at least of the finished product.

 

For the sake of time I am going with a modular building from a shop down the road from the church.  They build the floor, walls, and roof pieces in their shop and bring the pieces on a trailer to my place.  The beauty is that it is considered "modular" and does not require a building permit but a 10'x12' stick-build technically does.  I will get pics up as it goes.  The 120 and Frankentwelve are looking forward to life in the shed and my Jeep is looking forward to being back in the garage.


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#15 Trav1s OFFLINE  

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Posted September 05, 2015 - 10:57 AM

Picked up a Pointsaver from Kirkengines.com for the 312 and installed it this morning. Starts much easier and runs much better at WOT. Overall the engine sounds stronger and revs easier.  Very easy to install with three wires - ground, negative on coil, and one to points.  Again, I am impressed with the stuff from Kirk.

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Edited by Trav1s, September 05, 2015 - 12:11 PM.





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