Gear reduction starters

Anonymous-0 · Feb 7, 2009

I have a 6410JD that came with a big heavy Bosch starter.I put a lighter gear reduction with a smaller motor on it.The guy i bought it from said it would turn the engine over faster.Is this true?I know it has more torque and is easier on your battery because of lower starting amps.

ericlb · Feb 7, 2009

i wouldnt think so but i could be wrong, the main advantage to gear reduction starters is more tourque drawing less amps, for example, remember the sound of the old real hemi or big block dodges firing up? they had so much compression they almost sounded like the battery was low while they were cranking, but they cranked relativly slow,all dodges and plymouths back in the day had gear reduction starters, [even the slant 6's]

buickddeere · Feb 7, 2009

It's HP or KW on the starter's pinion shaft that turns the diesel.
Unless we know the KW of the old direct drive starter and the KW of the new reduction starter.
I would dare say a MT41 or MT42 Delco will turn an engine faster than the Denso or Nipper gear reduction unit Deere uses.
All other factors equal a 4KW PM starter will draw less current than a 4KW conventional direct drive starter.
To make power on the starter pinion, it still takes amps X volts. A direct drive starter drawing 750amp at 10V is going to out crank a PM starter drawing 500amp at 10V.

JDemaris · Feb 7, 2009

I've been using them on tractors and trucks for years, since AC Delco switched over in 1988 from DD to GR and had their starters made in Japan (now China).

Direct drive free spins at 13,000 RPM and a gear reduction free spins at 4000 RPM.

When mounted on an engine, if KWs of power are equal, the GR will turn over a diesel faster in cold weather, and a bit slower in warm weather. Also tends to outlast the DD because there's less of a shock load on it.

I've been buying Chinese clones for $120 brand new and so far, not had one single problem. Funny thing is, some of these clones accept standard Delco replacement parts.

One thing to watch out for is low power starters.
When the Chinese invasion first began, the GR starters had the same KW ratings as the DDs they replaced. But lately, they're selling down-sized power starters. Many that were 3.5 or 4 KW a few years ago, are now sold only 2.5 KW.

Anonymous-0 · Feb 7, 2009

Hi jdemaris and others, where do you get you GR stater from?

JDemaris · Feb 7, 2009

I've bought most of mine from DB Electrical. I'm sure there are others as good, but they've given me great service. They have some pretty good on-line catalogs, real people answer their phones, etc.

http://www.db-starter-alternator.com/

Gear reduction starters

Anonymous-0

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ericlb

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buickddeere

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JDemaris

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Anonymous-0

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JDemaris

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