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Hinomoto PTO problem

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MattyH
Join Date: Sep 2011
Posts: 4 Queensland, Australia
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2011-09-21          180481

I’ve appreciated the knowledge that gets contributed to these forums as just searching and reading has helped me diagnose and fix a starting problem with my Hinomoto N279.
So now I need some REAL help! I noticed an oil leak from the PTO shaft and set about fixing it. On the face of it fairly straightforward, remove the seal/bearing retaining housing, knock out old worn seal, replace with off the shelf equivalent, make up a new gasket and reassemble.
One minor event that occurred was that I pulled the PTO shaft out about 1 ½ inches during the operation but after a long difficult time jiggling it about, managed to get it back in.
Anyhow after reassembling it and filling back up with oil I had an oil tight PTO housing but...
• I cannot move the PTO gear selector at all, no movement front to back or side to side and
• The PTO now is permanently in drive, I cannot disengage it.
I took the housing off again and partially withdrew the PTO shaft but trying the PTO gear selector it was still completely immovable. I can’t fathom what could have happened.
I’ve got a parts manual on order from Scheaffers as I’ve got no knowledge of what goes inside the box and hope that a schematic might give me some clue. Access to the PTO components is going to entail some industrial scale disassembly of the tractor which I would rather avoid if at all possible

The only variation between the starting state and where I ended up is that I didn’t completely fill the
rear axle oil to capacity, only enough to run the check that highlighted the problem. There isn’t some complex oil based transmission that I haven’t taken into account is there?
Any suggestions about how to fix this? I’ve got two paddocks which haven’t stopped growing and its bush fire season soon.
Thanks in advance for any assistance


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Hinomoto PTO problem

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MattyH
Join Date: Sep 2011
Posts: 4 Queensland, Australia
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2011-09-25          180561

Okay Sunday night and I now have a functioning tractor. For anybodies reference the problem must have occured when disturbing the set of gears and forks on the PTO out putshaft setting the gearchange forks up in a unsupported configuration.
The solution was to remove the housing that contains the bearing for the input shaft (the PTO seal housing was already off), pull out the input shaft and get a clearer view of what was going on. It was apparent that the configuration was not set up as being in neutral. The gear lever wouldn't shift so a G clamp carefully inserted into the box, one edge on the back of the first fork, the other edge on the outside of the box and then gently tightened allowed the fork acting on the furthest back set of gears to pop forward and place that configuration in neutral. The action needed to be repeated for the other set of gears put they needed to go forward so a small diameter socket in the approriate gear change shaft tunnel and again a G clamp to apply gentle pressure popped it forard.
So with all gears no correctly aligned, remove the oil seal cove and slowly draw out the lower PTO until it comes out of the front bearing.
This is necessary to get enough clearance to insert the top shaft. Because of a mortal fear of the splined sleeve that connects the shaft to the power train slipping off and being lost in the bowels of the diff housing I degreased it and addedd a dab of super glue to retain it during the manouvers.
So with the top shaft in place, put in the rear bearing, replace the retaining clip, and tighten down the back retaining plate.
On the bottom PTO, carefull insert the shaft until it slides into the front bearing, put in the back bearing, replace the retaining clip, slide the oil seal housing over, don't forget the flanged sleeve that goes between the seall and the PTO shaft and replace the retaining clip and bolt down the housing. Try the gearbox at this point and you should hear the comforting snick as it enages with each gear. Best to test at this point before the next stage, refilling the gearbox with oil.
And that should be it. Hope this is useful to someone, happy to discuss any details that are'nt clear. ....

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Hinomoto PTO problem

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DennisCTB
Join Date: Nov 1998
Posts: 2707 NorthWest NJ
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2011-09-25          180564

Nice work Marty! Great description. ....

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