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Recently the tractor keeps over heating and loosing cooling water. Initial inspection reveals that there is water leaking out of the weep hole on the water pump housing indicating that the seal has gone West. So I was disappointed to check my trusty spares manual and find out that the water pump is only provided as an assembly and no mention of a replacement seal.<br>
Does anybody know or have experience if a replacement seal can be fitted or am I stuck with buying a replacement assembly? I've seen a few water pump seals advertised for Hinomoto's but they don't specify which model they replace.<br>
Is this water pump assembly more complex than a Rolex watch and beyond the endeavours of a competent home mechanic, due to special tools and lack of available spares or can it be tackled? I'd rather spend time and $8.75 than $155.00 for a replacement assembly.<br>
Thanks in advance for any feedback or experiences.<br>

Rebuilding a Hinomoto N249 water pump
Hinomoto
Replies 2 Post by MattyH

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.

Hinomoto PTO problem
Hinomoto
Replies 3 Post by MattyH