3900 Diesel vs 1975 4000 Gas

LarryBud

Member
Sorry to keep coming back but I'm getting closer on a purchase.

I have two candidates. A fully refurbished, pretty looking 3900 or a nice looking ( but not redone ) lest of the 3 cy gas builds.

My primary job is mowing. I'm thinking perhaps a 7' mower. I already have small tractor for the tight places. This one is for field mowing.

The 3600 will cost $500 more I'm guessing but it does have ROPS.

Thoughts?
 
Both may have 8 speed trans. 3600 with 8 speed will have live pto and shoe brakes. 4000 will have 8 speed with independent pto with wet disc brakes. the 4000 will handle 7ft shredder better.
 
The disk brakes on the 4000 would make
that an easy decision for me. Far superior
to the drums on the 3600... plus the extra
h.p.
 
Is it a 3600 or a 3900? The title and your first mention say 3900, but then a couple of sentences later you call it a 3600. The 3900 had the same rear axle as the 4000, but the front axle and steering of the 2xxx/3xxx series, sort of like a 4000 SU, but with a slightly smaller displacement engine.
 
(quoted from post at 06:43:33 11/22/22) Is it a 3600 or a 3900? The title and your first mention say 3900, but then a couple of sentences later you call it a 3600. The 3900 had the same rear axle as the 4000, but the front axle and steering of the 2xxx/3xxx series, sort of like a 4000 SU, but with a slightly smaller displacement engine.

Whoops. It's a 3600. Thanks for the feedback.
 
would not a 3900 have the wet brakes?? instead of a 3600 as the op says??? ALSO a 3900 would have an independent pto.. so the only difference between a 3900 and 4000, would be the HP and the front axle. One is totally rebuilt.. usually means a $100 paint job and new $36 decals.... If condition otherwise is equal, I would take the 4000 as it will handle an 8 foot shredder fairly well. However the 3900 may be a bit smaller for tighter areas, and a bit lighter with a smaller shredder..... if that's a concern. The 4000 is always been a bit weird, in as much as its a little bit too big to be small, and too small to be big.

If its a 3600, disreguard this post.
 
How many hours? Fully refurbished many times is a paint job and a new seat. A worn out diesel can be expensive and won't start cold.
 
Depends on what kind of mowing you want to do with a 7' mower. A heavy duty rotary mower on heavy brush will be pushing a 3600, but a 4000 won't break a sweat. But a 7' light duty or finish mower should be fine on frequent mowing of grass and weeds that are under control.
 
(quoted from post at 09:30:39 11/22/22) How many hours? Fully refurbished many times is a paint job and a new seat. A worn out diesel can be expensive and won't start cold.

Rebuild parts for the diesel are way easier, and cheaper to get than they are for the gasser (try finding a set of new pistons for a gasser). I would go with the 3600 diesel over the 4000 gasser any day, especially when running a 7' mower behind it.
 
Need to clarify - is it a 3900 or a 3600?
I didn't know they made a gas 3900...
A diesel tractor will use 30% less fuel.
But the fuel costs 60% more so no savings
there. A gasser is more pleasant to run.
Less noisy. Less stink.
I would be more apt to buy a tractor that
hasn't been prettyfied. Paint hides a
multitude of flaws and adds a lot to the
price.
I think the perfect tractor for you would
be a 4000 SU. Either gas or diesel.
The SU models are shorter and lower than
the All Purpose 4000 but they still have
the same heft, grunt and superb brakes of
the AP. If you were ever going to want a
loader on it then go with the AP.
I have a Heavy 6' 3 point rotary mower. I
run it behind my 3600 and 4000 AP depending
on what and where I'm cutting.
It is about all the 3600 can handle.
The 4000 handles it easily and could
probably take a 7 footer.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top