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MTD 990 YARD-MAN

mtd 990 yard man

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#1 Rock farmer OFFLINE  

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Posted July 20, 2015 - 07:00 PM

So, I've been entriged by MTD 990's
I've never seen one, and I don't know anyone who owns one.
But, I told myself if I ever saw one selling cheap, I'd buy it.
Well I woke up Sunday morning, and checked Craig's list for a Yard Man.
Three pictures didn't show much. The description wasn't very helpful either.
But the price was very attractive! So I went and bought it.

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At first, I thought it might be a Columbia. It has a Columbia grille.
But, it is a Yard Man. MTD bought yard man from Montgomery ward in 1975.
The engine is not Siezed. That's about as far as I gotten!

Joe
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#2 boyscout862 ONLINE  

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Posted July 20, 2015 - 08:48 PM

We do have some good manuals to download. It is similar to the 1200 I bought in May. I am 6' tall and find my machine a little uncomfortable but it is a well made machine. Good Luck, Rick


Edited by boyscout862, July 20, 2015 - 08:48 PM.

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#3 Diesel1050 ONLINE  

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Posted July 20, 2015 - 09:26 PM

You lucky sonafagun! Lucky I was picking up my new Jeep Sunday or that woulda been in MY shop! Anyway nice machine! Should have a 16 horse Briggs single?
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#4 Rock farmer OFFLINE  

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Posted July 21, 2015 - 03:43 AM

I'm 6' tall as well. Hope it fits me!
Seller said eight or ten horse. But, I believe it's the origional sixteen.
I took off one of the wheel weights. " MTD" is cast right into it.
I think MTD cast iron wheel weights are pretty rare?
I do like that shaft drive PTO!

Joe
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#5 JDBrian OFFLINE  

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Posted July 21, 2015 - 06:16 AM

Congratulations, Nice Yardman! I see a guy locally using what looks like a very nice 990. If it has 15" wheels it's a 990 clone. I think the 960 has 12" wheels. A lot of them out there are in pretty rough shape mechanically. That one looks like it's weathered from being outside but overall looks pretty solid. Wheel weights= big bonus. 


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#6 crittersf1 ONLINE  

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Posted July 21, 2015 - 07:30 AM

Nice lookin' rig!


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#7 Rock farmer OFFLINE  

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Posted July 28, 2015 - 07:13 PM

So the engine number is

326431 0139-01 7502121

Can anyone tell me the year from that?

Thanks!

Joe

#8 Diesel1050 ONLINE  

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Posted July 28, 2015 - 07:53 PM

75 I think!

#9 Rock farmer OFFLINE  

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Posted January 05, 2016 - 10:03 PM

So, I've been slowly chipping away at this.
I removed the engine. Removed the fan shroud.
And a large mouse nest.
Discover that the coil was in very bad shape. Bought a new one.
Tested the starter generator and it seems to work!
I drained the old oil. And, blew out all the rest of the tins real good.
Points and spark plug looked good. I haven't messed with the carberator yet.
I bought a new belt for the starter. The old one was seized to the fan and rotted bad.

Next step is to wire in the coil. It has two wires coming out of it.
I believe one will be power to the points.
And, the other is the kill wire. Is that right?
How do I know which is which?
I have a stud near the coil that I think had two wires joined on it.
That must have been for the kill switch?
The kill switch wire joins the tractor harness at a small Fiber board attached to the points cover?
Where do the two wires to the points join and get mounted?
I'm thinking they need to be insulated from the block?
If and when I succeed in starting it, I will want a wire coming from that small Fiber board that I can ground out on the engine block to kill the motor right?

Also, I be looking for a shroud and fan when I get this running.
The shroud is rotted away on the bottom and the fan is a bit broken.

Thanks!

Joe
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#10 VTXrider ONLINE  

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Posted January 08, 2016 - 09:35 AM

Good start on getting it running Joe. Do you have the manual downloaded for your machine for reference?

 

The magneto on the 16hp Briggs has one wire going to that insulated stud. Then two wires from there going to the points/condenser connection and to the small fiber block bolt on the points cover screw. (either wire could be used for each point). The kill wire connection from the ignition switch "M" post goes to the fiber block. You are correct that the points are insulated from the block and shorting it to the block will stop the engine.

 

If you have installed a new ignition switch, be aware some look the same but have different internal switch patterns. Make sure +12v is never connected to the magneto or it will smoke. (Sorry if you already know this but it happens often).

 

I may have a engine fan shroud that needs repair to sell for a few bucks.

 

By "fan" do you mean the front aluminum pulley/fan? I have an extra one of those also.


Edited by VTXrider, January 08, 2016 - 09:55 AM.

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#11 Rock farmer OFFLINE  

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Posted January 08, 2016 - 07:42 PM

Thanks for the reply VTXrider!
I have a tractor manual and, a engine manual.
But the tractor manual doesn't cover the engine and the engine manual doesn't cover this bit of wiring.
I'm hoping to start the engine on the floor without the tractor or, its wiring or, ignition key switch.

This is what I've got;

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I may have got the wrong coil / magneto.
I intend to just jump 12 volts to the starter / generator.
Hopefully it will crank fast enough to start (250 rpm's).
So, no risk of 12 volts to the coil.

Is this wiring correct?
What do I do with the extra wire from the coil / magneto?

4.image.jpeg

Thanks!

Joe

#12 VTXrider ONLINE  

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Posted January 09, 2016 - 08:08 PM

This is a closeup of the coil on a past restore. Yours is a bit different having an insulated wire for the ground. Shows it under one of the mounting bolts.

 

That little yellow box on the right side of the coil is not on mine. That magneto may be an electronic unit. It may or may not run on your engine.

 

Here is a link to the Briggs service manual on my MS Onedrive that includes the 16hp like yours. First item in this folder. Download it or any of 990 manuals you want.

http://1drv.ms/1AYpow5

 

The PDF files are parts lists for the 326421 engine.

 

It looks like you may be missing a governor spring also.

Attached Thumbnails

  • coil.jpg
  • Image 01.jpg

Attached Files


Edited by VTXrider, January 09, 2016 - 08:44 PM.

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#13 Dayton_King OFFLINE  

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Posted January 09, 2016 - 08:11 PM

Columbia? Wasn't that the only version that had that grill
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#14 VTXrider ONLINE  

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Posted January 09, 2016 - 08:48 PM

Columbia? Wasn't that the only version that had that grill

Yes, I believe so DK. May be a different hood from original.


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#15 Dayton_King OFFLINE  

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Posted January 09, 2016 - 08:54 PM

I reread. Lol. It was mentioned above. Love those 990s
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