JD 870 not pulling its own weight: Tractor Engine Repair Rebuild  -- Tractor Maintenance Discussion Forum and Review JD 870 not pulling its own weight: Tractor Engine Repair Rebuild -- Tractor Maintenance Discussion Forum

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 11-09-2008, 20:04 Post: 157771
trentvoigt



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 JD 870 not pulling its own weight

I just got this used 870. It worked well for a few weeks. Then I put a 5ft mower on the back and slowly but surely it would not pull it. I finally removed the mower and it now will not pull its own weight except in 1st gear.

What should I be looking for? Does anyone know what fluid goes in the transaxle in the back?






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 11-09-2008, 22:46 Post: 157773
kwschumm



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 JD 870 not pulling its own weight

Diesels are pretty simple, they just need air, compression, and fuel delivered at the right time. The easiest things to check are air and fuel filters. My bet is that the fuel system is gummed up.

If it has a glass fuel bowl, what's the fuel in it look like? Is it nice and clean or does it have a milky or odd appearance? If it looks in any way dirty I'd clean out the fuel bowl, change any fuel filters, drain out all the fuel in the tank and start with fresh fuel (not something that's been sitting for two months) and a healthy does of good diesel additive (Power Service or something like that).






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 11-09-2008, 22:53 Post: 157774
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 JD 870 not pulling its own weight

You sure it's the engine ...... and not the clutch?

//greg//






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 11-09-2008, 23:03 Post: 157775
trentvoigt



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 JD 870 not pulling its own weight

Definitely not engine. I am assuming clutch? How hard is it to replace? I can do just about any mechanical thing as I grew up in garages, but I don't want to go straight to the clutch if it might be a transmission problem? Are there pumps or anything else I should worry about? It seems to just not be able to pull its weight in any gear except 1st...makes for a very slow tractor.

Is the clutch fairly easy to get to and do yourself if you have a good garage?






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 11-10-2008, 00:07 Post: 157777
earthwrks

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 JD 870 not pulling its own weight

You'll have to split the tractor in half at the bellhousing.

I have never done it before but have read about it. BTW, my New Holland hydro has a clutch too (KW: you don't have a clutch?)

I would buy the service manual if you're the least apprehensive, or go online and research it.

As far as tools go I would use two wide-footed (so they don't tip over easily) floor jacks--one for each half. It will make rolling the halves apart and together much easier than just blocking both halves up and manhandling them.






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 11-10-2008, 07:01 Post: 157779
greg_g



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 JD 870 not pulling its own weight

Clutch replacement is pretty straightforward, if you replace the entire clutchpack. Separate the tractor into two pieces, remove old clutchpack/throwout bearing/pilot bearing, install new stuff, reassemble tractor.

If you go that route, find out from JD whether or not the clutchpack is already aligned - or if you have to do it yourself. Cuz all the post installation clutch adjustments in the world won't be any good if the stack height was wrong to begin with.

If you elect to have the clutchpack rebuilt, or simply replace the friction discs, then you'll have to align the reassembled clutchpack yourself. For that you need the tech specs, presumably available from your JD dealer. He might have a spline alignment tool that you can borrow/rent too.

//greg//






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 11-10-2008, 08:41 Post: 157783
kwschumm



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 JD 870 not pulling its own weight

Quote:
Originally Posted by earthwrks | view 157777
BTW, my New Holland hydro has a clutch too (KW: you don't have a clutch?)



I have an electric PTO clutch pack but no pedal. If there's a clutch buried in the hydro tranny somewhere it's news to me.






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 11-10-2008, 09:22 Post: 157785
earthwrks

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 JD 870 not pulling its own weight

KW: My hydro's clutch pedal is on the left. The PTOs have to be clutched before eng./dis. them.

The clutch is the first thing power is transmitted through before it gets to the hydro pump. From the pump power goes to a hydro motor then to a "3-range with reverse" gear transmission. Then the PTOs run off the trans. So, if the clutch is disengaged everything stops getting power.

If my machine were a gear type trans they offer a double-clutch--press the clutch so far and the PTO(?) stops, press it farther and the wheels stop.






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 11-10-2008, 09:42 Post: 157786
trentvoigt



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 JD 870 not pulling its own weight

The PTO seems to be still working fine. However, since I still have movement in first gear that could be enough power to run the PTO.

I have noticed that even with the clutch depressed the PTO grinds a little when you engage.






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 11-10-2008, 10:22 Post: 157788
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Quote:
Originally Posted by trentvoigt | view 157786
I have noticed that even with the clutch depressed the PTO grinds a little when you engage.

That's also a clutch adjustment. Your pedal isn't completely pulling the PTO friction disc away from the flywheel surface. Usually an easy adjustment. But from the other issues you described, it's the least of your problems right now.

/greg/






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Discussion Boards > Active Subjects > Messages as Posted > Tractor Engine Repair Rebuild Forum

Thread 157771 Filter by Poster:
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