GENMA Maintenance · Hydraulic System | Tank Level: Don’t Wait for the Alarm

The hydraulic tank is the heart of your system. Too low, and the pump may starve — leading to cavitation, noise, or even pump failure. Too high, and you risk overheating or oil spillage.

When to check

Per GENMA guidelines: check the oil level every shift (8 hours). Ideally, do it when the machine is cold and the boom is retracted or lowered — cylinder positions affect the level.

Topping up? Keep these in mind

•    Let it cool — oil temperature should be below 40°C to avoid burns.
•    Clean the filler cap area before opening.
•    Use the same brand and grade — mixing oils is a bad idea.
•    Filter new oil — even fresh oil needs to go through a filter or strainer.
•    Run for 2 minutes after filling, then recheck the level — air bubbles need time to clear.

Why does the level keep dropping?

If you just topped up and the level drops again soon, there’s a leak — either external (visible) or internal (like worn cylinder piston seals).

Time to investigate.

The sight glass looks small, but it’s your system’s early warning device. Half a minute each shift can save you big headaches later. Don’t wait for the alarm — by then, the pump may already be starving.