MK2 Service Wide Examination (SWE) Practice Exam 2026 - Free MK2 SWE Practice Questions and Study Guide

The introduction of contaminants into a hydraulic system can occur in several distinct ways, which are crucial to understand for maintaining the integrity and functionality of such systems. The correct answer highlights three primary categories: Built-In, Ingress, and Internally Generated.

When looking at these categories, "Built-In" refers to contaminants that are present due to the manufacturing processes and materials used to create the components and fluids of the hydraulic system. These can include particles and residues that are inherently part of the system from the time of assembly.

"Ingress" describes the entry of contaminants from external sources into the hydraulic system. This can happen through seals, gaskets, or any breaches in the system meant to keep out dirt, moisture, and other foreign materials. Identifying and preventing ingress is critical to sustaining system performance.

"Internally Generated" contaminants arise from within the system itself during operation. This can include wear particles from components, thermal decomposition of fluids, and chemical reactions that create sludge or varnish. Understanding how internal generation occurs is key to developing effective maintenance and monitoring programs.

Each of these categories contributes to the overall contamination risk in hydraulic systems, emphasizing the need for ongoing vigilance and appropriate maintenance interventions to ensure optimal performance and longevity.