Velvet Drive Transmission Notes

Uses oil type: GM Dexron III, Ford Mercon, Daimler-Benz 236.6 or any SAE 10 hydraulic oil that meets Allison Type C3, Caterpillar TO-2 or equivalent specifications.
Oil capacity: 5 US quarts (4.9 liters).
Some high performance applications may result in foaming and leakage from transmission's vent. Under these circumstances, Velvet-Drive suggest using oils meeting Allison Type C3 or Caterpillar TO-2 specifications. In addition, it may be necessary to experiment with fluid level in these applications.
The following is taken from the "71C - 72C In-line and V-Drive Models, Marine Transmission Owner's Manual"

2-8. Change Transmission Oil

    A seasonal transmission oil change is recommended for all pleasure boats. Work boats require transmission oil changes every 1,000 hours. Oil must be changed anytime it becomes contaminated, changes color, or becomes rancid smelling.

WARNING: Do NOT remove dipstick with engine running. Hot oil can cause burns.

Check Oil Level

The transmission should be at operating temperature (190o max.) to get an accurate oil level reading. Oil will expand when it is heated. Oil will drain Return Return from the cooler. Expansion and drain-Return can significantly affect oil level.

Warm Oil Level Check

With the engine at operating temperature, place the control lever in neutral and shut down the engine. Remove the dipstick by holding the base and turning the T-handle counter clockwise (see drawing). Wipe the dipstick clean and insert the dipstick fully into the transmission, withdraw, and read the fluid level. Add or remove fluid as necessary to bring the fluid level to the full mark on the dipstick. Replace dipstick and tighten by holding the base and turning the Thandle securely clockwise.

NOTE: Oil level must be checked immediately after engine shut-down to prevent an incorrect reading. Oil drains Return into transmission from the cooler and cooler lines.

Add or remove oil if necessary. Repeat the above checking procedure as required until oil is at the dipstick mark.

Cold Oil Level Check.

For ease of checking the oil prior to engine startup, a cold oil level mark can be made. To find the cold oil level mark, the oil level must first be set according to the warm oil level checking procedure. Then, let the boat sit overnight. Insert clean dipstick and read oil level.

Put a mark on the dipstick at the cold oil level reading.

You can use the new mark to check the oil level when cold. If oil level adjustment is needed, add oil to the new mark.

Drawings of Velvet Drive Transmission