What do you think??

   / What do you think?? #1  

jcmseven

Veteran Member
Joined
Dec 19, 2004
Messages
2,314
Location
western NC
Tractor
JD 2320; 4520
Fellow Posters:

I have posted before on this topic in brief, but as time has worn on I am feeling a bit more serious about my question to see if it could be a reality. As many of you know, I own a JD 850D XUV Gator. I bought this machine about one year ago after much debate and I would say I am most pleased with its reliability and service. I have added some mods including ITP 27" Mudlites on polished wheels, a winch, power steering kit, 2" lift kit, among other things. I chose the Gator over the Polaris Ranger at the time because I felt John Deere offered a better overall package for my needs and due to my strong dealer network and support. Currently, I have about 150 hours use on the Gator and aside from some cool weather starting issues it has been a solid workhorse. The one thing I do not like about my Gator is its lack of power in mid range and high RPM areas. As expected with a diesel the Yanmar diesel has a great deal of low range torque and moves heavy loads well. Where I notice it to struggle is pulling the long hills in my neighborhood, especially with trailer in tow. It will really struggle to maintain any real speed in these cases--and I do this quite a lot. I understand the larger tires put more strain on the engine, but I need the aggressive tread pattern for some of the locations I go. I understand one can change the sheave and perhaps achieve more mid range at the expense of some top end, another good thought that I find less appealing.

My goal is to have a machine which can pull long, steep grades with adequate power (in low or high range) to keep loads moving without bogging to a crawl. I do not want to have a higher top speed, but would also prefer not to loose top end to achieve this. With a weight of 1760 pounds full of fuel, I have come to the conclusion that my machine is underpowered for the terrain I have and its sprung weight. I am considering swapping out for a higher HP Yanmar engine, perhaps a TNV88 (36 hp) or equivalent. Does anyone have experience or know of a good resource for information regarding this?? I would, of course, want to evaluate whether this is truly a cost-effective upgrade and if it is POSSIBLE to do this. My understanding is that the drive"train" and axles, etc. are rated for up to 40 hp so I would not want to consider going beyond that number. I do realize that Polaris has a 40 hp XP 700 stock which is an option, but I have been happy with my current machine otherwise and like the diesel engine, leading me to pose this question to the group. Thanks in advance for the advice.

John M
 
   / What do you think?? #2  
well after seeing my buddy ride his 700xp and working it too i would go with a rtv1100 i think it would better suit your needs as a worker and power house . sure my buddy latches on to a trailer with his xp and does 40 mph down the road but i'll be honest the thing is falling apart on him and i mean it . i really hate to say it but it is if you just wanted to use it for hunting hand wanted to carry a deer out the woods or some deer feed into the woods it would be fine but for a everyday worker don't waist your money this thing is falling apart. if you want sheer brute pulling power get you a rtv 1000 with that set throttle thing that raises the rpms put a lift kit on it and pop you some 27"mudlite xl's or 589's and there ain't nuthin that's gonna stop you. now this is just my opinion of what i have seen .
 
   / What do you think?? #3  
Can you modify the engine to get more power, maybe injection pump tuning, or adding a very small turbo. Many guys with polaris rzr`s add turbo`s to their machines {although they are gasoline powered}. I would have to beleive that it would be less expensive than repowering it with a bigger engine. I never tried it, but in your situation, it may be worth looking into a little bit.
 
   / What do you think?? #4  
IIRC these are the same engines in the 3x20 tractors. They are cabable of more than what they are set up at. I think the real issue here is tires. I think 26's would have been a better choice and you most likely would not be in this situation. If you could find a set of 26's to try, you might find the power is good, and the traction is almost the same.

Rather than a motor swap, I would look at tires and injection pressures.:D
 
   / What do you think?? #5  
well after seeing my buddy ride his 700xp and working it too i would go with a rtv1100 i think it would better suit your needs as a worker and power house . sure my buddy latches on to a trailer with his xp and does 40 mph down the road but i'll be honest the thing is falling apart on him and i mean it . i really hate to say it but it is if you just wanted to use it for hunting hand wanted to carry a deer out the woods or some deer feed into the woods it would be fine but for a everyday worker don't waist your money this thing is falling apart. if you want sheer brute pulling power get you a rtv 1000 with that set throttle thing that raises the rpms put a lift kit on it and pop you some 27"mudlite xl's or 589's and there ain't nuthin that's gonna stop you. now this is just my opinion of what i have seen .

RTVs have their issues. All machines have issues. I had a Deere - liked it. I went Ranger Crew and love it. Dealer sucks, but I can work on it. I have 35 hours on it - all good so far.

D.
 
   / What do you think??
  • Thread Starter
#6  
I have thought about going back with a more stock wheel and tire combo for the purpose of increased power up hills, etc. I did not particularly want the big wheel combination but my dealer enjoys modifying some of the Gators he sells, and did so for me. It looks great but I am thinking the larger tires do have some negative effect on the machine's hill performance. I do also wonder how much driveline strain I am putting on the machine, but so far so good. I cannot help but think there is some modification that can be done to the engine to achieve 4-5 more HP and combined with a smaller wheelset, it might do the trick. Thanks for the advice.

John M
 
   / What do you think?? #7  
there has to be some engine mod i mean these things do have a twin cylinder 620cc engine they really ain't at the bottom of the totem pole when it comes to engines they got less than 40 cc's than a rhino 660 and you can mod the heck out of that engine . what we need is a mechanic. what about boring out the engine? did you ever try talking to a kawasaki mechanic at a dealership instead of a john deere dealership mechanic.

i know when my engine does finnaly go on my hpx i'm gonna have fun with this thing .i'm gonna find out what it's capable of and what i can fit into this frame. there is a 29hp kawasaki engine out there with the same weight and measurments as this engine.
 
   / What do you think??
  • Thread Starter
#8  
I agree Tommy. Mine, though, has the diesel Yanmar engine. It is--I believe--854 cc in displacement. I have noted that the higher HP Yanmar's used in the front cut mowers, etc., are only 1,000-1,300 cc's, so it seems logical that someone could bore out this Yanmar to make about 10 extra HP. Of course, this might be cost-prohibitive. I would be willing to consider a gasoline one again if it was an easier proposition with the gas engine than with diesel, but I like my current machine and would really be interested in what could be done to it and for how much $$$$. As I have noted, it is not weak by any stretch, but with a 1500 pound trailer in tow up some paved and or graveled roads which approach 20-25% gradient I need more ponies to keep the speed up. And I do this almost daily. Currently, it is a smoke billowing 5 mph effort, even in low range.

John M
 
   / What do you think?? #9  
Why not buy agressive tires in the stock size? Seems like the cheapest route. JC
 
   / What do you think?? #10  
we have some inclines in the woods around here but when i pull my trailer i use high gear on the road and in the woods i drop it in low and she never grunts like you talk about. maybe something is wrong with yours or something??smoke is a sign of a dirty filter too. my gas hpx will spin the tires before it bogs down with the trailer and it weighs atleast 1200lbs dry. it's a 16' double axle trailer. to me that deisel hpx should pull it with ease. i have 27"589's on mine too.
 

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