Mini excavator: change hydraulic oil?

Hydraulic oil decomposes over time and must therefore be checked and changed at regular intervals. In this article you can read when a change is necessary, how to proceed correctly when changing and what to consider.

Change: when?

With rented excavators, there is no need to worry about service work. Only if a warning light lights up should the landlord of the excavator be informed immediately. His instructions must then be followed.

  • Also read - Driving Mini Excavators: What You Should Pay Attention to
  • Also read - Operating Mini Excavators - You Must Pay Attention
  • Also read - Driving an Excavator - A Brief Guide

If you own the mini excavator yourself, you can tell when to change in several ways:

  • from the maintenance intervals specified in the operating instructions
  • by a message on the display
  • if topping up is often necessary

As a rule, you should also check the oil level again and again in order to be able to notice changes and also to top up sufficiently.

Control procedure

The displays are always slightly different depending on the model, but in most cases you will find a sight glass behind a maintenance door in which the oil level is visible between a min / max mark. The excavator must of course stand on a completely level surface and be switched off for the check - otherwise the reading will be incorrect.

How to refill

Here, too, there are often serious differences depending on the construction and model. Above all, the necessary levers and containers are in a different place on each excavator.

The basic steps for most models of excavators are:

  • Release the preload pressure of the reservoir for the hydraulic oil (this can be done in different ways, depending on the model)
  • Open the hydraulic oil tank
  • Refill through the filter
  • Replace the O-ring and close it again
  • Check the new oil level again
  • Stop releasing the preload pressure

Here too, of course, the excavator has to be on completely level ground. Always top up slowly to avoid having too much oil in the hydraulic system later.

Oil change

In principle, the oil change works like refilling, only that first via a drain plug (operating instructions!) all of the oil is drained and then topped up again until the specified oil level is reached. You should then properly dispose of all hydraulic oil.

Tips & Tricks Hydraulic oil is dangerous for the skin - you should therefore wear suitable gloves when changing oil. Also make sure not to smoke during any of this work and to keep ignition sources away.