Iseki TX1500 - no drive to rear wheels

[dantnz]

Its not on axle stands yet but will be later on tonight. what I described above was just on the ground. Will report back once I run through the tests again on stands. What I'm getting on the ground with the diff lock off and both brakes engaged is just engine revs - suggesting maybe a sheared left axle or a breakage within the diff itself? Will be clearer when on blocks.

 

[fxrs55]

Here are a few schematics for a TX1300F I'm not sure how
close they are to your tractor

 

[ArtMech]

Very good write up by fxrs55. I just wanted to propose you exactly the same test, but it's well done already :thumbsup:. Good luck. And keep us up-to-date.

 

[fxrs55]

I realize that tractor has no drive so the test I have suggested seems odd
but if you have it up and safely secured you could listen
from the back for noise while running tractor in gear.

 

[fxrs55]

I have been looking at the schematics and it looks like
pinion shafts 1 and 17 go into diff gear #9 which I have
always referred to as spider gears. If you have any
experience with automotive differential Items #1 and #17
would be the same as the axles in a rear wheel drive car.
Item #21 is the diff lock shifter fork and it goes over
item #2 which is what locks the diff. If you look close
at item #2 you will see 2 drive dogs on the side and I
think when the diff lock is on item #2 is engaged to
the end of item #4 which is the diff case. That then
would lock both pinion shafts together. When diff is
not locked then one wheel or other could spin. Part of
how that works is through items #11 which is also
referred to as a pinion gear which I know as spider
gears also. Now you said that you had a bang when
you disengaged the diff and then another
and then no drive. If you drive around with the diff
locked and you make sharp turns you are going to
stress all 4 of those spider gears until they break.
With the diff locked and you go around a sharp
turn the inside tire has to go as fast as the outside
tire or at least it needs to slid or spin but if
both tire have good traction then something will
eventually give out. The item numbers I've referenced
are on fig 32 above in post #12

 

[dantnz]

Update.

On axle stands:

Diff lock on - drive through right wheel, weak drive through left (can stop it with your hand)

Diff Lock off - Weak drive through both wheels (can stop either with hand)

Diff Lock off - right brake on: weak drive through left (stop with hand).

Diff Lock off - left brake on: Good drive through right wheel.

Diff lock off - both brakes on: No drive, engine runs free.

Hand turning wheels with engine off - both wheels free turn independently, no noise in the left wheel, but some slight grinding noises turning the right wheel.

fxrs55 - hear what you saying reference the pinion/spider gears, for the record I don't drive around with the diff lock lock on, just needed it to get out of the bog - also, being 2wd, this tractor will not turn a corner at all with it on! Back to the problem though, if the spider/pinion gears had given out, then shouldn't I still get drive through the left with the diff lock on (as it effectively bypasses the differential)? Also, the left appears to be the primary drive side, so if the spider gears were gone, then it shouldn't be possible to get drive to the right without the diff lock engaged?

What I can't quick work out is why I get good drive through the right with the right brake down, but also that I can apply both brakes without stalling the engine. That seems contradictory to me, other wise I would have said the problem must be the splines on the left pinion.

I will probably repeat the test again later, in a different order, in case the diff lock is staying on through part of the 'off' test.

Thanks for all your continued input, very helpful! With any luck I'll be able to get this narrowed down to a likely component before the spanners come out, so I can disassemble as little as possible.

Dan

 

[ArtMech]

The following are my thoughts.

Diff lock on - drive through right wheel, weak drive through left (can stop it with your hand) - not normal

Diff Lock off - Weak drive through both wheels (can stop either with hand) - normal if you stop them separately one after another by hand (diff. effect)

Diff Lock off - right brake on: weak drive through left (stop with hand) - not normal

Diff Lock off - left brake on: Good drive through right wheel. - normal

Diff lock off - both brakes on: No drive, engine runs free. - not normal: make sure the gear was really engaged, haven't you feel any smell of "burning clutch" while being stuck in the mud, are the brakes effective enough? Can you turn the wheels separately by hand with the engine stopped, both brakes applied?

Hand turning wheels with engine off - both wheels free turn independently, no noise in the left wheel, but some slight grinding noises turning the right wheel. - when you turn one wheel by hand, does another one turn in the opposite direction at the same time (diff. effect)? Not normal if not.

We'll see what else can be done.

 

[fxrs55]

Hand turning wheels with engine off - both wheels free turn independently, no noise in the left wheel, but some slight grinding noises turning the right wheel. - when you turn one wheel by hand, does another one turns in opposite direction at the same time (diff. effect)? Not normal if not.

We'll see what else can be done.

Ah, Very good point about trying to turn one wheel then the other with engine off.
saracenas has some good insight.
Just curious, which rear tire to you consider to be the right and the left.
Not trying to be a wise guy but when you're sitting on the seat looking
forward is that how you see right or left or are you standing in
front of tractor looking toward the back is that your left and right?
Now like saracenas suggested with tractor engine off
put transmission in 1st gear ( most resistance ) and clutch engaged
( pedal out ) don't use the brake but have someone hold
one wheel while you try to turn the other. What happens ?
If you can turn one wheel while in gear and someone holding the
other is not good. If you turn one wheel while trans is in gear
and no one is holding the other and no brakes are applied
the other wheel has to turn the other way, if not then
as saracenas has said not normal.

 

[ArtMech]

...or are you standing in
front of tractor looking toward the back is that your left and right?

No, I'm considering right/left from the seat point of all the vehicles. If that's about me .
And you're right, better to do that test with the lowest gear in.

 

[fxrs55]

Update.


What I can't quick work out is why I get good drive through the right with the right brake down, but also that I can apply both brakes without stalling the engine. That seems contradictory to me, other wise I would have said the problem must be the splines on the left pinion.


Dan

I have looked at the the schematics for almost a half hour and I
do not see how that is possible!