Yanmar 1500D 4 wheel drive does not work: Yanmar Tractors  -- Other Tractor Brands Discussion Forum and Review Yanmar 1500D 4 wheel drive does not work: Yanmar Tractors -- Other Tractor Brands Discussion Forum

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 11-10-2002, 16:50 Post: 44833
Ruel
2002-11-10 16:50:42
Post: 44833
 Yanmar 1500D 4 wheel drive does not work

My 4 wheel drive is inop. Can anyone tell me where to start the trouble shooting.
The fluid is full and the lever seems to be fine.
Thanks
Ruel






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 11-11-2002, 06:02 Post: 44858
TomG

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 Yanmar 1500D 4 wheel drive does not work

My 4wd engage linkage broke inside the DIFF cases. Something mechanical still felt like it was happening when pulling the engage lever, but the lever moved over a much further range than normal. I didn't need to test it, but I imagine that I could have pulled the lever back and forth while the tractor was running and the clutch out with no effects. Without chutching, it should seriously grind.

If it grinds while trying to engage the 4wd with the clutch out, the linkage is good and the problem likely is in the front drive train. In that case, the problem could be anywhere from a pinion at a differential ring-gear to final reduction gears on the ends of the front axles. One test for a broken front axle is to raise both front wheels and rotate a wheel by hand. The other wheel should rotate backwards. There may be better tests that others will suggest, and keep in mind that sometimes broken shafts will turn when they aren't under loads.






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 11-11-2002, 10:38 Post: 44869
DavesTractor



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 Yanmar 1500D 4 wheel drive does not work

You might want to pull back the driveshaft cover and see if it is spinning. You'll need to have it jacked up and put stands under it first. Dave






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 11-12-2002, 06:59 Post: 44906
TomG

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 Yanmar 1500D 4 wheel drive does not work

I believe that Dave knows his Yanmars, so looking at the front drive shaft likely can be done and that would be a pretty good test.

Take care with things on stands. We just had the second funeral around here in four years due to people working underneath vehicles on stands. There aren't that many people to start with, so two in four years is a pretty significant rate.






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 11-12-2002, 08:15 Post: 44912
DRankin



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 Yanmar 1500D 4 wheel drive does not work

And DON'T trust your FEL to hold up the front end. Use heavy duty quality jackstands all the way around.






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 12-16-2002, 18:04 Post: 46185
yanmar



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 Yanmar 1500D 4 wheel drive does not work

Thanks to all for your help,and a special thanks to Dave.
You were on target in the trouble shooting phase. The coupling on the drive shaft was slipping. I replaced the coupling on the Drive shaft and the ball bearings. The shaft seems to be at an angle to great to to keep the coupling intact, or the shaft coming out of the front axle is worn. When I have it on the jack stands all works fine, but if I start working it, it starts to slip again. Any suggestions other than replacing the shaft coming out of the front axle?
Again my thanks to all of you for your kind help.
Ruel






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 12-16-2002, 22:45 Post: 46201
lsheaffer



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 Yanmar 1500D 4 wheel drive does not work

You have to visually inspect the fwd input shaft to determine if it is bad. The splines should have square cut edges & not be rounded.






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 12-17-2002, 08:21 Post: 46210
TomG

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 Yanmar 1500D 4 wheel drive does not work

This is sort of an alternative possibilities comment. I'm curious if the input to the coupling can be seen to spin with no output rotation when the tractor is working and the drive is slipping. I ask this only because it not unheard of for some types of failures in differentials/axles to work OK on stands but not under loads.

The comment that the shaft and coupler don't seem be be at the right angle on the ground bears checking. As Leonard mentioned certainly the splines on both halves to be OK and inspection shouldn't be too difficult. I do recall a discussion about a Ford 1210 I think where a frame cross-member failed and resulted in a similar problem. Such a possibility might be checked unless the splines are in very bad shape.






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 03-18-2014, 13:00 Post: 189625
Bentrailfab



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 Yanmar 1500D 4 wheel drive does not work

Hello,

I just picked up my first tractor (Yanmar 1500d) and after 3 hours of moving some dirt around in the backyard the 4wd stopped working. It is amazing how fast you can get stuck in sand with only RWD. I bought it through a private party and he had just replaced the couplers on the front driveshaft and it looks like that is what failed again. Since I don't trust the guy I bought it from I am going to replace the couplers myself. I already have the manuals on order but I would like to take off the shaft just to get some parts on order. I removed the cotter pin, slid the washer and spring back and it will not slide back "into the tranny" to be removed. Am I missing a step? Any help would be greatly appreciated!
Thanks!






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 03-18-2014, 13:21 Post: 189626
lsheaffer



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 Yanmar 1500D 4 wheel drive does not work

The coupler on the front of the shaft needs to slide back.






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