The document provides instructions for servicing components of a 330B L excavator including:
1. Installing a compression brake on the engine and connecting wires.
2. Removing and assembling the rocker shaft and pushrods, including disassembling the rocker shaft into individual components.
3. Removing the cylinder head from the engine which involves removing manifold, pushrods, and bolts holding the head in place. Proper lifting equipment is needed due to the head's weight.