Get the
M59 and rent the excavator.
That's what I would do. For the past 5 years I've owned both a JD310SG with 6000 hrs and an
M59 with 1000 hrs doing flood repair, landscaping, and some general backhoe work.
First things first: reliability. Both machines have been reliable - although right now the 310SG has some sort of problem with it's temp gauge that I can't seem to find & I'm too stubborn to call out the dealer. I sure wish there was an online forum as good as TBN for JD310 TLBs. If something similar went wrong on the
M59, there's a ton of people here on TBn with knowledge who can help.
Otherwise, both tractors have had their main boom hydraulic cylinder rebuilt, but for different reasons. The
M59 had to have a throttle cable replaced. And that's about it.
Both start and run fine. The
M59 has a 6 range HST and the JD310 has the 4 speed powershift. Both are MFWD. The
M59 is better on snow and ice. The
M59 transmission is much handier for loader work than the 310 powershift. The 310 is much better traveling down a road with a load in the bucket. It would be better anyway, but the 310 has comfort ride & I didn't add that to the
M59. Should have done so. The 310 also has an air seat which the
M59 lacks but sure could use. In spite of that, we use the
M59 a lot more just because it is nearly the power and much more handy. I ought to add those things to the
M59 & maybe will someday. Or not.....
The 310 with a tall vertical exhaust sure beats the
M59's low exhaust in the fume-eating department. I keep meaning to put a vertical stack on the
M59, but it is nice not to have it there to hit things.... tossup..
The JD can lift and carry more than the
M59, but you almost never need to. The
M59 has a 1 cu yd bucket & 4000 lb lift capacity. Even heaped up you just can't stuff much more than 3000 lbs in that size bucket - which the
M59 handles with ease.
The JD310 has a much heavier 1.3 cu ft FEL bucket & 6000 lb capacity, but not nearly as good visibility as the
M59. The
M59 can load it's bucket fuller and quicker with less hassle and damage to the surroundings. The JD carries a load without bouncing so much.
Both machines are can lift a full load high enough to load a dump truck.
Same for the backhoe. The JD is more powerful, but the
M59 has plenty of power for the hoe. Both hoes have plenty of power to pick the machine up and shake it like a dog with a bone.. The
M59 has a thumb and the JD doesn't. Big difference there. Lots of time it is the thumb that makes the difference. Having a hydraulic thumb is almost like having a whole extra machine on site. I don't have a 36" BH bucket. Both tractors have quick change BH bucket attach - but I usually use a 24" bucket.. But I'd guess that either tractor has enough backhoe power to use a 36" bucket in average soil about the same. The
M59 doesn't care whether it has the 24" or 12" bucket. More than enough curl and lift power. I use 24" on either machine in rocky soil. It's about the same.
The
M59 has an open platform with a thick insulated canopy versus the JD310 which has a cab with heat & AC. I am lucky because I can choose to work on nice days. On nice days the open platform
M59 is much more convenient for actually getting work done and I really like the big insulated canopy. It's usually plenty. But in nasty weather the JD310 wins hands down - as long as you aren't always getting in and out of the cab. If so, it's a pain.
The 6-range HST on the
M59, thumb, and smaller size plus nearly as much power as the 310 but with half the weight all mean we use the
M59 more. It's always the first choice unless we need the extra reach of the JD backhoe's extendahoe. Then we use the 310 and glad to have it..... but after that extra reach job is done we usually park the 310 and get back on the
M59.
rScotty