Mtd 990 - wip - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
Backyard Round Table - L & G Tractor Related Topics Lawn and Garden Tractor Related Topics General Discussion Board

Reply
 
Thread Tools Display Modes
post #1 of 24 Old 04-18-2017, 09:23 PM Thread Starter
MTF Junior Poster
 
Join Date: Apr 2017
Location: Ohio
Posts: 14
Mtd 990 - wip

Hi All, I'm new here and this is my second post.

I recently acquired what I believe is a 1971 MTD 990 (Fourteen Hudnred).
Model:320427
Type:0147-01
Code:7101281

I bought it because it came with a plow and PTO tiller. Wouldn't you know it, it started up after a little hesitation the day I bought it. I also got it to start to unload it from my trailer. It hasn't run since. I've contacted the seller and his was the typical response "it's always started right up for me, are you sure there's gas in it?"

So, here are the issues.
It sat outside for years and looks pretty bad. Almost no original paint.
The wiring is corroded pretty badly, I think this is my main problem, but I've done the following (the tractor does turn over:
I replaced the battery with a Walmart 24F, replaced the fuel filter, replaced the spark plug, and I replaced the solenoid.
I'm thinking that I'd like to make a new harness for it or in the least replace the battery cables and the cable that runs from the solenoid to the S/G.

Any suggestions on direction I should take? I really want this to run for a day or two so that I can get my 7000sq ft garden tilled up. If I can get it working so/so to get some rows tilled up, I'll put the time and money into to make it a nice tractor again. Also, The PTO shaft under this tractor isn't supported anywhere. If I detach the tiller the PTO shaft will be dragging in the mud. Is it common to remove the shaft when an implement isn't being used?

Here's a photo of the beast


Edit:fixed broken image link
NEOhio is offline  
Sponsored Links
Advertisement
 
post #2 of 24 Old 04-18-2017, 10:36 PM Thread Starter
MTF Junior Poster
 
Join Date: Apr 2017
Location: Ohio
Posts: 14
Re: Mtd 990 - wip

I forgot to mention that this tractor has been rewired sometime in the past. There are no safety switches. Is that the way this tractor is supposed to be?

Also, is there a wiring diagram available online? I found the owners manual for this tractor (I think), but it didn't contain anything relevant to wiring in the IPL.

Thanks.
NEOhio is offline  
post #3 of 24 Old 04-19-2017, 07:00 AM
Senior MTF Member
 
Join Date: Aug 2011
Posts: 374
Re: Mtd 990 - wip

Since the motor code says it is an early '71 and the decal says 14 horse power I think you are right in assuming the tractor is a '71 model. Any time you remove an attachment the pto shaft must be removed also, strictly from a safety standpoint. The tractor did originally have 2 safety switches, one on the pto engagement lever and the other I believe on the e-brake. I think most tractors this old have had the safeties by-passed by a previous owner.
As for the starting. Be sure the gas is turned on. A lot of these old 990's will not run with less than a half tank of gas because they are gravity feed and the tank sits lower than the carb in a lot of cases. There is a wiring diagram in the owners manual. However, just typing mtd 990 wiring diagram in your internet search will bring up five or six wiring diagrams. Just in case the safeties are actually there, put the e-brake in the start/park position and make sure the pto engagement lever is in the off position. Good luck, it seems to be a fairly straight and complete machine. I kind of like it just the way it is, no paint but good decals.
genefw is offline  
Sponsored Links
Advertisement
 
post #4 of 24 Old 04-19-2017, 07:44 AM Thread Starter
MTF Junior Poster
 
Join Date: Apr 2017
Location: Ohio
Posts: 14
Re: Mtd 990 - wip

Thanks for the reply, genefw.

The tractor currently has about 3 gallons of gas in it and I am turning the gas on and pulling the choke lever. It's definitely good to know that I may have to keep it full.

When I did a google search for MTD 990 wiring diagram, it did bring up a ton of wiring diagrams, but it looked like they were for other tractors. I did end up finding this one, though. Looks to be correct. If I were to make a new harness for it, would 12 awg be fine throughout?

NEOhio is offline  
post #5 of 24 Old 04-19-2017, 08:32 AM
Minding my P's & Q's
 
JP Savage's Avatar
 
Join Date: Nov 2014
Location: Lake Wobegon, MN
Posts: 816
Re: Mtd 990 - wip

Nice tractor. I've been on the look out for one myself. Hope I find on in that good of shape.

You can search just in MTF for MTD 990 or MTD 960 and find a lot of useful information. There are quite a few folks here that have repaired or rebuilt them.

12 AWG is fine. Can get by with 16 AWG in most places. Try to rewire with same colors as shown in the wiring diagram. Will save you a lot of grief later.
Doing it all in just 1 or 2 colors makes it hard to figure out a problem a year or two later. I once had a tractor someone had used only yellow wire on it. What a pain.

I would check and clean the battery cables and all connections first off.

A mixture of baking soda and water will clean and remove battery corrosion from wire ends and battery terminals. May need a wire brush to make it go quicker.
1/2 cup water and 2 table spoons soda. Enough soda so there is some undissolved on the bottom of container. Sometimes I use a narrow deep clear plastic container and soak the ends of battery cables in it over night. It will fizz the corrosion out. As long as you see bubbles forming, the mixture is working. Wear eye protection when messing with it though.

Sent from my DELL WS650 Desktop PC, by tappity tap tap'n on the keyboard. And which not even once have I dropped down the hole in the outhouse.
Utility before aesthetics.
JP Savage is offline  
post #6 of 24 Old 04-19-2017, 08:55 AM Thread Starter
MTF Junior Poster
 
Join Date: Apr 2017
Location: Ohio
Posts: 14
Re: Mtd 990 - wip

Thanks for the reply, JP Savage.

Quote:
Originally Posted by JP Savage View Post
Nice tractor. I've been on the look out for one myself. Hope I find on in that good of shape.
It is in pretty good shape and seems rock solid


Quote:
Originally Posted by JP Savage View Post
12 AWG is fine. Can get by with 16 AWG in most places. Try to rewire with same colors as shown in the wiring diagram. Will save you a lot of grief later.
Doing it all in just 1 or 2 colors makes it hard to figure out a problem a year or two later. I once had a tractor someone had used only yellow wire on it. What a pain.
It's been rewired twice I think and there is just random black and red wiring throughout. I plan on using the correct wire color per the diagram.
I'll put an order in for 12 and 16 awg this evening.

Quote:
Originally Posted by JP Savage View Post
I would check and clean the battery cables and all connections first off.
I can post a photo when I get home from work, but the battery cables are shot. They are cracking and the copper is heavily corroded.

[/QUOTE]
NEOhio is offline  
post #7 of 24 Old 04-19-2017, 10:45 AM
15,000 +posts!
 
Tractor-Holic's Avatar
 
Join Date: Jan 2008
Location: MA
Posts: 16,365
Re: Mtd 990 - wip

The points on those old Briggs often need a cleaning in order to get good enough spark to fire the plug...old timers used a dollar bill ,you'd open the points after turning it over by hand until the contacts were closed,insert the dollar bill,and pull it through to remove any corrosion on the contacts...usually it would get them to fire right up..

If it has good spark,a quick snort of some starting fluid or gas from a squirt bottle in the carb throat should get it to start and run ,if it fires up and stalls,then your not getting fuel to the carb..after sitting a long time the tank,carb,and fuel lines are likely full pf rust and maybe clogged with shellac or varnish..often an engine will run after being "woken up" after a long nap,but shortly after the fresh fuel loosens all the crud and it ends up in the fuel line,carb,and fuel filter..


Tractor-Holic is offline  
post #8 of 24 Old 04-19-2017, 10:50 AM Thread Starter
MTF Junior Poster
 
Join Date: Apr 2017
Location: Ohio
Posts: 14
Re: Mtd 990 - wip

Quote:
Originally Posted by Tractor-Holic View Post
The points on those old Briggs often need a cleaning in order to get good enough spark to fire the plug...old timers used a dollar bill ,you'd open the points after turning it over by hand until the contacts were closed,insert the dollar bill,and pull it through to remove any corrosion on the contacts...usually it would get them to fire right up..

If it has good spark,a quick snort of some starting fluid or gas from a squirt bottle in the carb throat should get it to start and run ,if it fires up and stalls,then your not getting fuel to the carb..after sitting a long time the tank,carb,and fuel lines are likely full pf rust and maybe clogged with shellac or varnish..often an engine will run after being "woken up" after a long nap,but shortly after the fresh fuel loosens all the crud and it ends up in the fuel line,carb,and fuel filter..
I did think about crud building up after the amount of time it's been sleeping. The fuel lines are clear and I replaced the gummed up filter. I have not checked the carb yet. If I can't get it started after a new solenoid, battery cables, and solenoid to S/G cable I'll spray some ether into the carb to see if she's not getting any fuel. I think she is, though. You could be right about the points needing to be cleaned up. I'll check that out this evening.
NEOhio is offline  
post #9 of 24 Old 04-19-2017, 02:17 PM
Senior MTF Member
 
Join Date: Aug 2011
Posts: 374
Re: Mtd 990 - wip

It looks like you're getting lots of good advice. I got one of these last December. As Tractor-holic pointed out, I had to clean the points to get it started. I finally used a steel finger nail file, because I wasn't having any luck with the other tried and proved shade tree methods. That was after doing the same things you have already done.
genefw is offline  
post #10 of 24 Old 04-19-2017, 05:59 PM Thread Starter
MTF Junior Poster
 
Join Date: Apr 2017
Location: Ohio
Posts: 14
Re: Mtd 990 - wip

genefw, definitely good advice.

Something else came up. So, I'm replacing the batter cables and the solenoid to S/G cable and I pulled a wire out of the ignition switch when I was dropping the battery in. I don't remember where it goes and none of my photos show where it was.

The wire is the one that runs from the ignition switch to the ignition coil. (See Pictures)
The wire on the left hand side of the coil is the one that runs to the ignition switch.
There are three possible places on the ignition switch the wire could run to. I could test all three, but it's having a rough time starting as it is and I'd have to remove the battery every time with no guarantee that it'll start anyway.

NEOhio is offline  
post #11 of 24 Old 04-19-2017, 08:19 PM
Senior MTF Member
 
CowboyBob's Avatar
 
Join Date: Sep 2015
Location: Canada's Detroit neighbour
Posts: 280
Re: Mtd 990 - wip

The coil will need power when the key is on and when cranking. A test light and turn of the key will figure that out quick. Also I had one of those tractors with the big 16 hp Briggs. Mine had the geared transmission. Just a word of advice mine, a friend who bought the same as mine and countless others that came through my shop had mouse nests. All above the flywheel. Or against it. Mine had the stator on the flywheel and mouse pee had totally wrote it off. No signs from the outside. But take a few covers off and check it out. You may not have important electrical in there, but that is the shrouding for your cooling. It can either cook your engine or catch the old dry nest on fire when working it hard. Like tilling. Just saying be cautious trying to limp it along to do the job. You'd hate to be out a good tractor like that from rushing into one season.


Sent from my iPhone using Tapatalk
CowboyBob is offline  
post #12 of 24 Old 04-19-2017, 09:10 PM
Senior MTF Member
 
Join Date: Aug 2011
Posts: 374
Re: Mtd 990 - wip

Okay, now I see. A previous owner replaced the mag with an automotive 12 volt coil. The one I got in December also has this conversion. Mine isn't wired into the ignition switch though. Mine has a toggle switch to energize the coil. A wire comes from the positive side of the battery into the toggle switch and the second wire goes from the toggle to the positive side of the coil. I have to flip the toggle into the on position, and then use the keyed ignition to start the engine. Flipping the toggle off kills the engine.
They say you should also ground the battery to the engine when using this setup. Don't know why.
genefw is offline  
post #13 of 24 Old 04-19-2017, 09:12 PM
Senior MTF Member
 
CowboyBob's Avatar
 
Join Date: Sep 2015
Location: Canada's Detroit neighbour
Posts: 280
Re: Mtd 990 - wip

Should be able to get the original stator for 70$. Id put it back to stock. Make things easier. It'll run forever without a battery if you have to. Coils can be a pain.


Sent from my iPhone using Tapatalk
CowboyBob is offline  
post #14 of 24 Old 04-19-2017, 09:42 PM Thread Starter
MTF Junior Poster
 
Join Date: Apr 2017
Location: Ohio
Posts: 14
Re: Mtd 990 - wip

Quote:
Originally Posted by CowboyBob View Post
The coil will need power when the key is on and when cranking. A test light and turn of the key will figure that out quick. Also I had one of those tractors with the big 16 hp Briggs. Mine had the geared transmission. Just a word of advice mine, a friend who bought the same as mine and countless others that came through my shop had mouse nests. All above the flywheel. Or against it. Mine had the stator on the flywheel and mouse pee had totally wrote it off. No signs from the outside. But take a few covers off and check it out. You may not have important electrical in there, but that is the shrouding for your cooling. It can either cook your engine or catch the old dry nest on fire when working it hard. Like tilling. Just saying be cautious trying to limp it along to do the job. You'd hate to be out a good tractor like that from rushing into one season.
Excellent advice. I'll dig deeper once, I get it started. One problem at a time.

Quote:
Originally Posted by genefw View Post
Okay, now I see. A previous owner replaced the mag with an automotive 12 volt coil. The one I got in December also has this conversion. Mine isn't wired into the ignition switch though. Mine has a toggle switch to energize the coil. A wire comes from the positive side of the battery into the toggle switch and the second wire goes from the toggle to the positive side of the coil. I have to flip the toggle into the on position, and then use the keyed ignition to start the engine. Flipping the toggle off kills the engine.
This is a fantastic idea. I'm going to try to get mine rigged up the same way tomorrow at least temporarily. I probably have some switches laying around from some previous electronics projects.

Quote:
Originally Posted by genefw View Post
They say you should also ground the battery to the engine when using this setup. Don't know why.
My battery is ground to the engine block, so I'm all good there.

Quote:
Originally Posted by CowboyBob View Post
Should be able to get the original stator for 70$. Id put it back to stock. Make things easier. It'll run forever without a battery if you have to. Coils can be a pain.
This may be something that I look into in the future. When I've got the tractor running decent. If I take a stronger liking to it, I'll do a rebuild or resto. Not sure how faithful I'll be to the original, time will tell, I guess.
NEOhio is offline  
post #15 of 24 Old 04-20-2017, 09:59 AM Thread Starter
MTF Junior Poster
 
Join Date: Apr 2017
Location: Ohio
Posts: 14
Re: Mtd 990 - wip

I feel dumb, guys.
I was just looking back through the photos that I posted on this thread and see that there are letters on my ignition switch.
I couldn't see any letters on it in real life.
But if you look directly to the left of the wire that are in place, there's the letter "M."
That's the magic location for my wire, I think. I could probably use the R as well, correct?

NEOhio is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome