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Pulling The 1978 MTD 990 In For Winter Project


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#1 VTXrider OFFLINE  

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Posted October 09, 2015 - 04:26 PM

I have had this 990 for a couple of years as a parts machine. Never needed any parts from it so far. So I am bringing it in the shop for a winter project. I never tried to start it, just parked it.

 

One obvious problem is a rear axle seal. Another is steering. It works and is faily tight but I can feel the gears binding some.

 

Hoping a fellow in Canada can make a new dash tower for this from a pristine dash I sent him. He has a positive mold made and is trying to find a proper plastic material for it.

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Edited by VTXrider, October 09, 2015 - 04:31 PM.

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#2 KennyP OFFLINE  

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Posted October 09, 2015 - 04:37 PM

Not a bad looking tractor! Have fun!


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#3 DH1 ONLINE  

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Posted October 09, 2015 - 05:34 PM

Yes looks like a good start, I notice you tractor has the Quick attac on it, mine has the Scissors lift.

I also have a 50" mower deck with all the brackets and Quick attac for it. Do you know what has to be done to put a Quick attc on a tractor that was made with the Scissors lift? 


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#4 glgrumpy ONLINE  

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Posted October 09, 2015 - 08:14 PM

Hey, that's NO parts tractor, looks good!  Junk I have had in past were parts tractors, and still made them good.  Let us know on that dash mold thing, might be interested in one, even tho I'm between MTD's now and getting out of hobbie. Never know when one might come along and fall off a truck in driveway! 

  ON quick attach, think you CAN change over pretty easy, but need a whole new lift rack/linkage on the tractor. Might need a parts tractor to get all that. Think it uses same mount holes on frame and all. Works similar, but just has those slip-on slots on deck and bars running accros the lift linkage for those to grip on, both front and rear. You would remove the link mount behind engine then.


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#5 JDBrian OFFLINE  

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Posted October 10, 2015 - 07:29 AM

Thanks for the pics. Looking forward to seeing what needs to be done to get that 990 in top shape. 


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#6 VTXrider OFFLINE  

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Posted October 10, 2015 - 07:56 AM

Yes looks like a good start, I notice you tractor has the Quick attac on it, mine has the Scissors lift.

I also have a 50" mower deck with all the brackets and Quick attac for it. Do you know what has to be done to put a Quick attc on a tractor that was made with the Scissors lift? 

When I first became a member of the tractor forums, I posted about making the rockshaft on a 1980 restore project. D-Dogg asked to make a sticky on MTF for the purpose of also changing from a scissors style to the quick change carriage lift. It is a fair amount of work to change but can be done.

http://www.mytractor...ft-rebuild.html


Edited by VTXrider, October 10, 2015 - 08:07 AM.

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#7 holdenboy1960 OFFLINE  

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Posted October 10, 2015 - 08:19 AM

looks to be a good project & reasonably tidy 1 too 


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#8 VTXrider OFFLINE  

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Posted October 11, 2015 - 08:41 PM

Started work on it today. Going over the engine to see if it will run. Oil looks good enough to start with and will be changed if it runs. Checked fuel tank an it's clean inside but will need a rubber bushing for the shutoff valve. New fuel hose and filter. Cleaned and set the points. The carb is very clean inside but I spent a couple hours scrubbing the outside. Removed the fan shroud and found no nest. Have spark. The battery that has been sitting in there for 2 years is taking a charge. Sticker says it is a 2011 and 525 cranking amps.


Edited by VTXrider, October 11, 2015 - 08:42 PM.

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#9 VTXrider OFFLINE  

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Posted October 12, 2015 - 09:14 AM

Went to the local shop and picked up a tank bushing. I was kind of excited to see it run. Started it with no problem and the carb was good at the nominal settings. Bad news is it smokes. Letting it run did not clear it up. Hydraulics are not working so no lift and no motion forward or reverse.

 

At his point I think I will pick up the mess and ponder whether to continue on or just keep it for parts.

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Edited by VTXrider, October 12, 2015 - 09:50 AM.

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#10 VTXrider OFFLINE  

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Posted October 12, 2015 - 04:05 PM

I pondered over a Coors and decided to continue.

 

The transmission and gearbox was 2 quarts low and now have hydraulics. The rings may be frozen so I removed the head and poured some Marvel Mystery oil into the cylinder which is clean and no wear ridge.

 

Battery took a full charge. :D

 

Ordered a rear axle seal and head gasket.


Edited by VTXrider, October 12, 2015 - 04:07 PM.

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#11 DH1 ONLINE  

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Posted October 12, 2015 - 04:12 PM

Good to hear things aren't so bad, getting the hydro trans axle working is a big step, the engine might smooth out as you use it more and more. :thumbs:  Keep us posted.


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#12 KennyP OFFLINE  

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Posted October 12, 2015 - 05:55 PM

Run some of that MMO in the oil too. If the rings are stuck, it might pop them loose once it warms up good!


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#13 VTXrider OFFLINE  

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Posted October 14, 2015 - 07:13 PM

Got the skins and dash off and ready for power washing tomorrow.

 

More observations:

The steering wheel and the brake disc came off easily. :say_what:

The steering pinion and segment gears and the segment shaft are worn out. I have another assembly to replace it.

Wire harness is in good condition, just a few new spade connectors needed.

The front spindles and axle are in good shape.

 

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#14 VTXrider OFFLINE  

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Posted October 15, 2015 - 11:14 AM

Power washed and spray degreaser to clean up. Should be ready for further tear down now.

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#15 Rock farmer ONLINE  

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Posted October 15, 2015 - 04:51 PM

Oh that photo is so undignified!
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