top shaft lubrication D4

I think it's all by "splash" and it seems likely that the top shaft will not dip into the oil in the transmission to pick up oil. However, if the transmission is like the J series D2 with a single reverse gear, it is probably a two shaft design where the transmission input/clutch shaft has a drive gear fixed to it right at the front of the case and this turns the countershaft (pto drives from the rear of it) at all times the clutch is engaged. The output/bevel gear pinion shaft is fitted as an extension of the input shaft, but is independent of it, being driven only when a gear is engaged with the countershaft. When you have a reverser lever and a 3 shaft transmission, it may be different, so which D4 you are talking about might be important

The recommendation for stationary PTO work is certainly because that would usually be high speed, loaded and might be continuous for a day or more where as leaving it idling in neutral with the clutch engaged probably would not be that severe of a duty and not expected to last that long. In fact the engineers may not have considered that the field recommendation would become to leave tractor idling in neutral with clutch engaged.

sorry. it is a d46U. the information i have is from the Hyster manual for the D4 early winch. i suppose the rule would be same for a pto or belt drive.

I thought I heard or read somewhere that its recommended to overfill the transmission on stationary tractors doing shaft work do to the lack of lubrication because of the transmission design?

U series D4 does not require periodic attention - let it run all day every day in neutral with clutch engaged. All bearings are lubricated in neutral. Same for D2. D6 and 7 need the direction lever in either forward or reverse and the speed lever in neutral. U series D8 needs the periodic steering clutch engagement to lubricate bearings when stationary. Later D8s do not and both levers should be in neutral.

Thanks. the D4 6U that i have doesn't have the johnson bar. the info i am quoting is from the Hyster winch manual so it could be generic enough to cover other applications. i would think that if lube for the top shaft was an issue though there would be a warning in the op manual for stationary PTO work like belt pulley operations.

Information from Cat on lubrication needs for stationary work. It's not too specific but does include the models I described

[attachment=53433]Stationary operation - trans lubrication.jpg[/attachment]