Hay maker2
Member
For some time I have been watching and reading various posts and the responses about the Denso gear reduction starters. I have always here nothing but great things about them and how much faster they spin the engine over. Being that my 4020 is an early one from 1965 and has been converted to 12 Volts some 25 – 30 years ago I still have issues with the Delco 30MT Starter.
For a period of about 10 years I religiously removed the PITA every fall and replaced the brushes, bearings, springs, etc. and never once had an issue with it during this span. I must admit that I have not been that ambitious in removing it and maintaining it unless there is an issue which arises about every 2 – 3 years. For a while now I decided that I was going to make the leap and get the Denso gear reduction starter. I figured out the part number of the starter that would fit into the tractor and would clear the drop down intake manifold.
Anyway the Delco needed maintenance and I bit the bullet and had a new armature installed in it as the old one was bent. At this point I reinstalled the PITA and started my testing as I wanted to know the actual RPM’s that the engine was turning over at.
30 Degree Day
I have two 12 Volt Class 31 batteries with 925 CCA installed on the tractor and using my photo tachometer:
With the newly rebuilt Delco 30MT it cranked the engine at 155 RPM’s
With the newly rebuilt Delco 30MT and the pump DESTOKED it cranked the engine at 180 RPM’s
I removed the Delco and installed the Denso Gear reduction Starter and performed the same test as above. During the test my friends’s eyes got big and said “WOW, that thing really cranks over FAST!”
So the Denso Starter….
While searching for a gear reduction starter I ran across a bulletin from Deere that provided a conversion starter part number for the 30 – 60 series which utilized the 7000 & 8000 series starter. Link below:
https://jdparts.deere.com/partsmkt/document/english/pmac/33762_fb_DensoStarterMotorKit.htm
It provided part number RE549229 (4.8KW). I looked this up and it used on numerous applications and if you go in the online parts list under any one of the tractors (30 – 60 Series) and do a search for “conversion” it brings up the conversion starter and provides part number RE251126, which subs to the RE549229. This is a planetary style gear reduction starter. It is a little smaller than the Delco 30MT and a heck of a lot easier to install on my 4020 than the Delco!
The RE549229 is used on the 8120’s thru 8520’s so I figured that this would be a beast in my 4020!
When Checking the Cranking RPM’s pf the engine like I did with the Delco, this is what I got:
The Denso cranked engine at 130 RPM’s
The Denso and the pump DESTROKED cranked engine at 150 RPM’s
That little armature in that Denso sure spins fast and gives the impression that the engine is really cranking like heck.
Giving the facts now, I would rather of spent the money on an electric destroke. Yes they are pricey, but any John Deere with a Closed Center hydraulic Pump should have one installed on them as I now feel that the electric destroke is cheaper than batteries and starters!
For a period of about 10 years I religiously removed the PITA every fall and replaced the brushes, bearings, springs, etc. and never once had an issue with it during this span. I must admit that I have not been that ambitious in removing it and maintaining it unless there is an issue which arises about every 2 – 3 years. For a while now I decided that I was going to make the leap and get the Denso gear reduction starter. I figured out the part number of the starter that would fit into the tractor and would clear the drop down intake manifold.
Anyway the Delco needed maintenance and I bit the bullet and had a new armature installed in it as the old one was bent. At this point I reinstalled the PITA and started my testing as I wanted to know the actual RPM’s that the engine was turning over at.
30 Degree Day
I have two 12 Volt Class 31 batteries with 925 CCA installed on the tractor and using my photo tachometer:
With the newly rebuilt Delco 30MT it cranked the engine at 155 RPM’s
With the newly rebuilt Delco 30MT and the pump DESTOKED it cranked the engine at 180 RPM’s
I removed the Delco and installed the Denso Gear reduction Starter and performed the same test as above. During the test my friends’s eyes got big and said “WOW, that thing really cranks over FAST!”
So the Denso Starter….
While searching for a gear reduction starter I ran across a bulletin from Deere that provided a conversion starter part number for the 30 – 60 series which utilized the 7000 & 8000 series starter. Link below:
https://jdparts.deere.com/partsmkt/document/english/pmac/33762_fb_DensoStarterMotorKit.htm
It provided part number RE549229 (4.8KW). I looked this up and it used on numerous applications and if you go in the online parts list under any one of the tractors (30 – 60 Series) and do a search for “conversion” it brings up the conversion starter and provides part number RE251126, which subs to the RE549229. This is a planetary style gear reduction starter. It is a little smaller than the Delco 30MT and a heck of a lot easier to install on my 4020 than the Delco!
The RE549229 is used on the 8120’s thru 8520’s so I figured that this would be a beast in my 4020!
When Checking the Cranking RPM’s pf the engine like I did with the Delco, this is what I got:
The Denso cranked engine at 130 RPM’s
The Denso and the pump DESTROKED cranked engine at 150 RPM’s
That little armature in that Denso sure spins fast and gives the impression that the engine is really cranking like heck.
Giving the facts now, I would rather of spent the money on an electric destroke. Yes they are pricey, but any John Deere with a Closed Center hydraulic Pump should have one installed on them as I now feel that the electric destroke is cheaper than batteries and starters!
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