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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

oc 3 vs jd 40

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lizardtrack

03-11-2004 19:07:35




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is there any comparison between the oc3,4 and a jd 40 what are the +s & -s of each, what about getting parts etc. I once had a terratrac highlift quite a machine but heavy. thanks lizardrack




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jdemaris

03-13-2004 06:03:20




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 Re: oc 3 vs jd 40 in reply to lizardtrack, 03-11-2004 19:07:35  
A few more things I forgot to mention. The Deere 40C and some OC4s have steering clutches. HGs, OC3s and some OC4s do not. The Deere has dry steering clutches which tend to get stuck from moisture and time sitting idle. To fix, tracks must be split and final drives removed. It's a problem with most all dry-clutch crawlers - but some crawlers allow access to steering clutches without removal of tracks and final drives (e.g. Deere 450, Allis Chalmers HD series, etc.). That's why Deere later changed over to wet cluthes. The HGs,OC3s and some OC4s have no steering clutches at all, and operate with a differential and wet brakes. Brakes are easily servicible without removing final drives. Downside is that full power does not go to both tracks, all the time - somewhat contrary to what their advertising claimed. The reality is - with the Deere you will loose all power to one track when steering. With the Cletrac controlled differential, you will loose SOME speed on one track when turning, but in most conditions, there will be some push on both tracks. Now, with the OC4 - it was available with two track-drive systems. One is the controlled differential system used in the HGs and OC3s, and the other is a wet-clutch and brake system. OC4 also came with a dual-disk engine clutch, four speed transmission, and an optional reverser or aux. trans. called the "Slo-Lo", and a choice of gas or diesel engine. Specs: Engine - 30 horse at the flywheel or 27 on the belt. Engines were 130 cubic inches. Weight of machine - 5000 lbs.
Ground speeds - OC-4 (with slo/lo in high range) 1st - 1.5 m.p.h. 2nd - 2.4 m.p.h. 3rd - 3.3 m.p.h. 4th - 5.2 m.p.h. rev. 1.8 m.p.h.
OC-4(with hi/lo in low range) 1st - .8 m.p.h. 2nd - 1.2 m.p.h. 3rd - 1.7 m.p.h. 4th - 2.7
m.p.h. rev.-.9 m.p.h. OC4 tested with a maximum pull of 5000 lbs. whereas the 40C pulled 4500 lbs. and the Deere 420C pulled 4860 lbs.

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jdemaris

03-12-2004 20:04:31




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 Re: oc 3 vs jd 40 in reply to lizardtrack, 03-11-2004 19:07:35  
40C weighs around 4600 lbs. Ground speeds 1st - .8 m.p.h., 2nd - 2.2 m.p.h., 3rd - 2.9 m.p.h., 4th - 5.3 m.p.h. Drawbar horsepower - 15 , PTO or belt horsepower - 23.5 belt. Engine size - 101 cubic inches.

OC3 or HG weigh around 3600 lbs. - Ground speeds 1st - 2.01 m.p.h., 2nd - 3.19 m.p.h., 3rd - 5.24 m.p.h OC3 - 20 drawbar horsepower, 24 belt horsepower. Engine size 132 cubic inches.

There are plusses and minuses to both. 40C Deere is heavier built, has an overhead-valve engine, weighs more and will pull/push more. Also has a very usable low first gear for dozing. Deere-specific parts can be very expensive and the powertrain is unitized which can make it somewhat harder to work on. Cletrac HG or OC3 is lighter - so it is easier to truck but won't push or pull as much as the Deere. It has a bigger engine and more horse, but is geared so high in first gear that it's too fast (and light) for many dozing jobs - unless it has the optional auxillary trans. which brings the ground speed of low-low to .6 m.p.h. The original 3 speed transaxle is a Clark unit and is used in many other machines (e.g. Case 310, Terratrac, BF Avery wheel tractor, etc.). Engine is a Hercules flathead, and some engine parts can be scarce. Drivetrain is not unitized, so it's easier to do certains kinds or repairs to. Many parts are generic and easy to get, and most of the rest are generally available new, reproduced, and/or used. They are both good machines, but the Deere is certainly has more rugged design. Keep in mind that the Oliver Cletrac HG/OC3s were originally designed more for row-crop farm work than for pushing dirt. Oliver didn't get serious about the industrial application of the small crawler series until the OC4.

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jed

03-12-2004 10:10:08




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 Re: oc 3 vs jd 40 in reply to lizardtrack, 03-11-2004 19:07:35  
OC 3's are poorly made. Frame rails crack, clutch problems and overall not enough power or weight. They would be good in a sandbox.



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Karen

03-12-2004 02:57:17




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 Re: oc 3 vs jd 40 in reply to lizardtrack, 03-11-2004 19:07:35  
I would stay away from the 40 three roller. Parts are harder to find and cost more then the four roller machine. Also stay with later OC3 with frame that goes around side of tranny. It is much stronger, OC4 is another good choice as is Case 320 or 310. When you get one email me. I know a place you can get parts.



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