Another lauson question

[hondaatc]

Hey fellas I’m looking to find out what oil if any would go into the upper cases on my newly acquired t651r full shift model these case ” if thats what they should be call ” are high up on both side of the lower unit one side has the shift linkages and the other side looks like it might have a drain plug any help is appreciated

 

Thanks

James

[joecb]

That is the “transmission housing”.  to fill, remove the inspection cover and fill with #62 Mobil fluid up to the small oil level screw located on the opposite side of the case. So says the Lauson manual. I researched the #62 Mobil fluid and found that it’s similar to a hydraulic fluid or a light machine spindle oil. I use the spindle oil in my motor, seems to like it just fine.

Joe B

PS, someone had posted the Owners manual here a while ago, maybe he wil come back with the link

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hondaatc

[Buccaneer]

I didn’t realize Lauson even had a “shift” model.

Prepare to be boarded!

[joecb]

Oh’ ya’ – shift motor, F – N – R. But what an engineers wet dream. I don’t know if they were trying to avoid patent infringement issues or if the engineering department just “got away” from the bean counters. The Lauson “transmission it built into the leg below the powerhead and contains a automotive style disc clutch and a planetary gear train for reverse. The entire thing is a elegant assembly of bearings, springs and leavers. With the planetary reverse, you only ger half speed in reverse. To make things even more complicated the gear shift lever are linked to both the transmission and the carburetor, so as to prevent overspeed in neutral and reverse. I believe that they only made this trans for a couple of years, maybe 1951 -53 … before the bean counters caught up to them.

Joe B

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hondaatc

[hondaatc]

Thanks joe fantastic information this sounds like the lauson way to over Engineer everything i have heard that the transmission on these didn’t work great or were to complicated to fix what did u mean by spindle oil

[joecb]

Spindle oil =  light viscosity high quality oil used to lubricate high speed spindles on machine tools.  I use Mobil Velocite light #6

available on flea bay … in quart and gallons

Joe B

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hondaatc

[jcrigan]

The engine sump uses 30 weight, non detergent oil. About 22 ounces. Thanks for posting what the transmission needs for lubrication. I have one of these motors and appreciate the information.

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hondaatc

[Author]

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