Yanmar ViO20-3 Full Repaint, Undercarriage Repair and Scheduled Maintenance

before

The ViO20-3 before painting. Rust is visible in several places.

after

We finished with a clear coat, and the machine looks shiny and sharp.

Background

Hello, this is Saijuki Engineering.

Today we show repair work on a Yanmar ViO20-3 mini excavator. Along with a full repaint, the customer asked us to carry out scheduled maintenance and fix other problem areas.

Repair Method

Full repaint

Remove the covers and carefully wash areas covered with mud and grease.
Mask the decals.
Apply filler where needed.
Apply surfacer, then the top coat.
Finish with a clear coat, remove the masking and the job is done.

Why surfacer matters

Surfacer is a primer treatment applied before the top coat. It gives better paint adhesion and color, and rust protection. Saijuki Engineering applies surfacer in every paint repair. *We forgot to take photos of this step this time. Our apologies.

Front idler replacement

The rubber tracks are also being replaced, so we remove them.
Remove the old idler.
Install the new idler. (For details, see this article: https://saijuki.com/repair_case/repair_case-2345/)

[Scheduled Maintenance Performed]

500-hour scheduled maintenance

– Engine oil change
– Engine oil filter replacement
– Fuel filter replacement
– Water separator cleaning
– Air filter cleaning

[For Those with Similar Concerns]

As in this case, doing a full repaint when work on site is quiet, together with scheduled maintenance and repairs, saves a lot of time and is highly recommended. For machines brought to our yard, transport costs can also be reduced. Buyers exporting machines from Japan can also have painting and repairs done before shipment. Feel free to contact us.

More repair cases

Leave your heavy equipment problems to Saijuki Engineering.

We also offer on-site repair in Japan. Contact us by phone or LINE.

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Repair Details

First, we remove the covers and wash the machine. Good surface preparation is essential.
We apply filler to dents and larger scratches.
Applying filler to the arm.
The original paint was very thick and hard to remove.
We apply surfacer and paint the undercarriage.
The body also gets a full surfacer treatment before the top coat.
Next, we replace the front idler.
We reassemble the adjuster cylinder and install the front idler. The rubber tracks were also replaced with new ones.
We also carry out the 500-hour scheduled maintenance.