The manual says to use White Lithium Grease.
You should grease the top of the wear plate and the turret pin.
Here's the maintenance instructions;
Quote:
MAINTENANCE:
1.For ease of hookup: frequently lubricate the wedge surfaces, around the king pin, and the skid plate surface, apply a lithium grease to the bearing surfaces as described in the assembly section of this manual. (Note: Resistance is typical in the Sidewinder™ arm)
2.Keep pin-box hitch painted to prevent rust and maintain a good appearance. (Do Not paint over labels)
3.At least once per season, disassemble unit to clean, inspect, lubricate and re-torque fasteners.
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