Satoh Beaver S373-D 4-wheel drive

   / Satoh Beaver S373-D 4-wheel drive #1  

EBGwd59

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Jan 1, 2022
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14
Tractor
Satoh
My Beaver is a S373-D, 3-cyl, 4-wheel drive selectable version from late 70's.
Had some wiring smoke and burns this winter and finally got parts to fix it.
Color and age on a few wires not readable since it has been painted over.
Many connectors were broken and a few wires burned and insulation cracked off.
I have the manual and have traced many of the wires.
It will crank and run but I want some advice about the wiring before I head off into the woods.
Got a new regulator for it and not sure if I have the wires hooked up correctly and need some help to verify.
The wire colors are as follows.

Alternator--------------------Regulator
wire color--------------------wire color

Blk/Y---------goes to--------Yellow wire
White--------goes to--------Blk wire
White/Red---goes to--------White wire
White/Blk----goes to--------Blk/W

Yellow Fuse line wire goes to Green wire and also has continuity to white/red wire at regulator
With switch on wire goes to Green wire and also has continuity to white/red wire at regulator

I have been through the manual several times.
Seems like a typo in at least one location in the repair manual.
It calls point 3 or L as being a Yellow/white lead when mine is a Yellow/green.
It also shows a 35 amp alternator when mine is 15 amp.
Who has more experience with wiring and can help me figure out if I have a couple of wires crossed.
The regulator does get warm when the tractor runs.
The battery voltage goes from about 12.5 to 14 when tractor runs.
Here are a few pictures of the manual and my notes.
Thanks for any advice and discussion.
It is normal for the new regulator to get warm?
I turned it off and disconnected battery till I get a good solid answer.
Don't want to guess and kill the old blue girl, she has been so good that past 40+ years.
Yes, I have replaced the fuse holder with a modern one, new lights and light switch.:)
EB
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IMG_7333.jpg

Alternator S373A 3KA engine.jpg
3Cyl diesel wiring.jpg


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   / Satoh Beaver S373-D 4-wheel drive #2  
I do know the Yanmar VRs, Mitsubishi VRs and the Shibarua VRs in the new solid state are much more interchangeable now.

Is your new VR a VR-550 solid state? Those have all 6 terminals in use like my Yanmar YM2610.

In the Satoh S370 manual I have this page. But your machine is a S373 right?

1647745701796.png

A closer look at the VR.
1647745754504.png


At the way beginning of the manual, there were 3 engines listed in the KE series. It's possible your arrangement is the 15A version we are not seeing here.

1647745866448.png


Section 8-8 is the VR info.
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The S373 became the MT373. I do have the manual too.
 

Attachments

  • MITSUBISHI MT373 S373 BEAVER-3.pdf
    1.7 MB · Views: 146
   / Satoh Beaver S373-D 4-wheel drive
  • Thread Starter
#3  
Thanks for all the help. Got it back working great now.
 
   / Satoh Beaver S373-D 4-wheel drive
  • Thread Starter
#5  
Take meter and trace continuity for each wire from known source. Track wires back as far as needed and disregard wire color codes as some do not match drawings but some do. Drawings do help align pin configuration into plugs so that if someone works on tractor in the future pin configuration will be correct per drawing. Link to drawings and photos here. Satoh Tractor S-373D.
IMG_7143_Original.jpeg
 
   / Satoh Beaver S373-D 4-wheel drive #6  
Take meter and trace continuity for each wire from known source. Track wires back as far as needed and disregard wire color codes as some do not match drawings but some do. Drawings do help align pin configuration into plugs so that if someone works on tractor in the future pin configuration will be correct per drawing. Link to drawings and photos here. Satoh Tractor S-373D.
View attachment 805736
Nice write up.

I love the image gallary you have. Nice machine overall too.
 
   / Satoh Beaver S373-D 4-wheel drive #7  
Hey there, great write up and detailed info. Does anyone have a diagnosis procedure for the generator/charging system or a link? I just bought my tractor, belt was very loose also battery was going blow, found out it’s not charging with tight belt. I almost burnt my finger on the VR when I reached under the dash. Any tips?
 
   / Satoh Beaver S373-D 4-wheel drive #8  
Update, I quickly found the fuse was bad. Replaced and now I have dash lights. Removed the voltage regulator and found a giant burn spot. I think I’ll be replacing that and retesting.
 
   / Satoh Beaver S373-D 4-wheel drive #9  
My Beaver is a S373-D, 3-cyl, 4-wheel drive selectable version from late 70's.
Had some wiring smoke and burns this winter and finally got parts to fix it.
Color and age on a few wires not readable since it has been painted over.
Many connectors were broken and a few wires burned and insulation cracked off.
I have the manual and have traced many of the wires.
It will crank and run but I want some advice about the wiring before I head off into the woods.
Got a new regulator for it and not sure if I have the wires hooked up correctly and need some help to verify.
The wire colors are as follows.

Alternator--------------------Regulator
wire color--------------------wire color

Blk/Y---------goes to--------Yellow wire
White--------goes to--------Blk wire
White/Red---goes to--------White wire
White/Blk----goes to--------Blk/W

Yellow Fuse line wire goes to Green wire and also has continuity to white/red wire at regulator
With switch on wire goes to Green wire and also has continuity to white/red wire at regulator

I have been through the manual several times.
Seems like a typo in at least one location in the repair manual.
It calls point 3 or L as being a Yellow/white lead when mine is a Yellow/green.
It also shows a 35 amp alternator when mine is 15 amp.
Who has more experience with wiring and can help me figure out if I have a couple of wires crossed.
The regulator does get warm when the tractor runs.
The battery voltage goes from about 12.5 to 14 when tractor runs.
Here are a few pictures of the manual and my notes.
Thanks for any advice and discussion.
It is normal for the new regulator to get warm?
I turned it off and disconnected battery till I get a good solid answer.
Don't want to guess and kill the old blue girl, she has been so good that past 40+ years.
Yes, I have replaced the fuse holder with a modern one, new lights and light switch.:)
EB
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View attachment 738126
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View attachment 738130
I found parts for mine was out of sight, i discovered Cub Cadet 7193, 1996-1997 700 series compact utility tractor Mitsubishi built parts interchange with my Mitsubishi/BeaverIII Satoh, the parts are reasonably priced.
 
   / Satoh Beaver S373-D 4-wheel drive
  • Thread Starter
#10  
I found parts for mine was out of sight, i discovered Cub Cadet 7193, 1996-1997 700 series compact utility tractor Mitsubishi built parts interchange with my Mitsubishi/BeaverIII Satoh, the parts are reasonably priced.
Do any of these models have interchangeable 3-pt hitch parts? Who is a good supplier? Any suppliers online?
 
 
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