1. Sight Glass Level Check
Before starting the engine, glance at the hydraulic tank sight glass. The oil should be between the low and full marks. Low oil often means a leak somewhere — small hoses, cylinder rod seals, or the swivel joint. Topping up without finding the leak just hides the problem.
2. Breather Cap Condition
The breather cap on top of the hydraulic tank keeps dirt out while letting air in. Tap it with a wrench handle. If dust falls out or the cap feels clogged, replace it. A blocked breather creates vacuum in the tank, leading to pump cavitation and premature failure.
3. Quick Coupler Hose Inspection
On excavators with hydraulic quick couplers, the short hoses between the arm tip and coupler see constant flexing. Run your hand along each hose (engine off). Feel for bulges, cracks, or chafing against the bucket linkage. A burst here dumps all hydraulic oil in seconds.
4. Cylinder Rod Scoring
Walk around the machine and look at every cylinder rod — bucket, arm, boom, and blade if equipped. Shiny streaks running lengthwise indicate scratches or hard chrome loss. A scored rod will cut the cylinder seal and leak oil within weeks. Small nicks can be smoothed with a fine stone. Deep grooves require rod replacement.
5. Unusual Temperature After Warm-Up
Run the machine for ten minutes with moderate movement. Place your hand near the hydraulic tank (do not touch hot surfaces). If the tank feels too hot to hold for five seconds, cooling is inadequate. Check the oil cooler fins for debris and the return filter bypass indicator.
Want a printable daily checklist for your operators? Reply with your excavator model — we will send a one‑page PDF tailored to your machine’s inspection points.
