Bedrock AW 68
Anti-Wear Hydraulic Oil

Bedrock AW 68 is an anti-wear hydraulic oil in ISO viscosity grade 68, the heaviest of the three Bedrock AW grades. Equipment makers specify ISO 68 where the oil runs hot for long stretches, where loads on the pump and cylinders stay high through the shift, or where the pump design needs a thicker oil film. The anti-wear additive protects pump parts under that sustained pressure.

A heavier oil keeps a thicker film between moving parts as the reservoir warms, which helps a pump hold pressure and a cylinder hold its load on a hot afternoon. In service, AW 68 resists oxidation and thickening at high operating temperature, separates from water that enters the reservoir, controls foam and protects steel and yellow-metal parts against rust and corrosion. Because it flows more slowly when cold, let the system warm up before loading it hard.

Use AW 68 where the operator's manual or the maker's temperature chart names ISO 68, and in older machines where the maker's service bulletin allows a step up in grade. For most mobile equipment in a warm climate, Bedrock AW 46 is the grade the manual names, and Bedrock AW 32 covers systems that call for the lighter oil. Keep the three grades separate on the shelf and fill by the grade on the reservoir decal.