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Old 09-08-2010, 11:23 AM   #38
ralphyost
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City: Cape Coral FL
Country: USA
Vessel Name: Say GoodBye
Vessel Model: 21 Mako
Join Date: Oct 2007
Posts: 261
RE: 120hp Lehman lube

"The manual for our Velvet Drives states that only ATF (Dexron) should be used in them. Later manuals apparently added the bit about using lube oil but from what I've been told by our diesel shop and a marine gear transmission specialist, ATF is still the preferred lubricant for a Velvet Drive. As I understand it there are restrictions that apply when using lube oil. There are no restrictions when using ATF."

Quoting directly from the Velvet Drive manual, dated 8-82, it states on page 11:

Type F Dexron and other hydraulic fluids which meet Detroit Diesel Allison Division of General Motors Corp specifications for type C3 oils are recommended for use in all Velvet drive marine gears.
Lubricating oils which are recommended for us in diesel engines and fall within the Allison specifications for C3 oils may be used in all Velvet drive marine gears if the engine RPM does not exceed 3000 RPM. SAE #30 is preferred. SAE #40 is acceptable if high operating temperatures are anticipated. Multi viscosity oils such as 10-40W are not acceptable. The first choice is SAE-API service class "CD" oils. The second choice is SAE-API service class "CC" oils.
The equivelent DOD* mil specs are:
CD MIL-L-21046
CC* MIL-L-45199

Detroit Diesel Allison Division of General Motors Corp developed the C3 specifications for oils to be used in their hydraulic automatic and power shift* transmissions used in heavy duty or severe service conditions.These oils are very well suited for use in all Velvet drive marine gears.
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