Just my $.02 from reading many, many posts on lubrication, and my 1945 Square Dial MG manual from Monarch, a lubrication manual from Monarch allegedly appropriate for the year
, the lubrication manual
posted to Vintage Machinery, the 1942 round dial and 1965 square dial manuals posted there, links at the top of the forum as "Stickies." Add in way back in 1977, my aircraft powerplant instructor provided his observation that it's the improvements in lubrication that has contributed more than metallurgy to component longevity. And his beating into my head "What does the manual say
?" When I was in the Army, I was known as the guy who had the manual for every thing we had in the unit. I was never sorry I had them.
The specifications have changed over the years. My 1954 square dial MG manual calls for SAE weight 10 in the spindles, SAE 20 in the headstock. Me: "Uh, no thanks, not after 71 years of lubrication improvements. The above mentioned lubrication manual specifies Vactra Lignt in the front and rear spindles and the headstock reservoir. Sounds much better than the SAE specified in my manual, and it was provided by Monarch. So no worries about the spillage into the headstock from the spindle resivours per Monarch
as they also specified for the single sight glass headstock. Leadscrew end bearing? Per the lubrication manual, Mobile Vactra Heavy Medium vs the grease most find in there.
The 1965 manual, page 20 lists "Shell Hydraulic Oil 27
" as well as Vactra Light. At one time or another, Monarch listed them all as acceptable. Now, well there are threads that report conversations with Monarch and they recommending the Mobile DTE machine oils, not the numbered hydraulic oils. But (behold the underlying truth), at one time Monarch did list hydraulic oil. So pick your truth. A suggestion? Why question what Monarch recommends as the most appropriate modern formulation? The DTE numbered machine lubricants. Will the other stuff work? Well at one time, yes Monarch said it would.
What I would really like to know is what is the apron "Special recommendation. See pink tipped in sheet on page 19"? No real matter, by 1965 Monarch called for Vactra #2 and seeing as it lubricates the ways, makes sense to me.
I have no doubt the argument will go on long after my death.