Customer Service

Cat® Equipment Maintenance: Guide to Inspecting the Hydraulics on your Equipment

Estimated read time: 2 minutes

By Cat Publications

Published Jan 07, 2026

When you power up your machine, you’re not just beginning the day’s work — you’re also taking the first step in protecting your equipment. Begin with a quick visual inspection before operation, then follow through with smart operating habits and routine maintenance.

Don't just look at your machine - listen.  Hydraulic systems can tell you a lot if you pay attention. Unusual sounds often signal issues before they become serious problems.

Before diving in, review your Operation and Maintenance Manual (OMM) for safety guidelines and make sure you’re wearing the right personal protective equipment (PPE).

How to Inspect your Cat Hydraulic System:

1. Prepare the Machine

Park on a dry, level surface. Lower all attachments, lock the hydraulic controls, and shut off the engine.

2. Initial Check

Start the engine briefly and listen for unusual sounds—whining or grinding can signal pump cavitation or bearing issues.

3. Relieve Pressure

Turn the engine off, switch the key to the “on” position, and cycle the control levers to release any remaining hydraulic pressure. Allow components to cool before moving on.

4. Walk-Around Inspection

• Verify fluid levels using sight gauges.

• Look for leaks or worn hoses near steering and brake valves.

• Inspect the hydraulic pump area for damage or seepage.

• Tighten or replace loose hose clamps.

• Check oil cooler and condenser lines for leaks at fittings and hose wear.

• Ensure fan motor connections are dry and secure.

5. Cylinder and Linkage Check

Dirt buildup around seals can indicate leaks at lift and tilt cylinders. Examine rods, pins, and joints for wear or damage