Wear parts: when to change breaker tool pins and auger teeth

Wear parts cost little to change and a lot to ignore. The intervals below are the ones printed in the breaker and auger drive manuals. Where the manual gives a diagram or a table per model, we point to it. The manual is e-mailed from the "Download manual" button on the product page. Page numbers refer to it.

Updated 2026-10-18

Short answer

Breaker tool pins: turn the worn face every 100 to 150 hours, replace every 500 hours. Front cover: measure the clearance to the tool every 50 hours or weekly and replace it once the gap is beyond the maximum. Seals: every 2000 hours. Auger teeth and pilot: check regularly against the wear diagrams in the manual.

Hydraulic breaker

Part	What the manual says
Tool pins	Change the face that touches the tool every 100 to 150 hours of actual operation. Replace the pins every 500 hours. Deformed pins make the tool hard to change.
Front cover and tool	Check the clearance every 50 hours or weekly. Replace the front cover once the gap between it and the tool is over the maximum wear allowance. The reject limits per model are in the manual (section 5-10, table 1).
Rubber plug or spring pin	Fit new ones after they have been removed and fitted two or three times.
Seals	Replace every 2000 hours of actual operation, or when oil leaks. Find and fix the cause of the damage.

Changing the tool

From the breaker manual, section 6-1. Use a crane for the tool and other heavy parts, and wear safety shoes.

Set the breaker horizontal on wood blocks with the accumulator on top.
Knock out the rubber plug or spring pin and the stop pin from the opposite side with a hammer and the press pin from the tool box. Make sure nobody stands where the pins come out.
Put the press pin into the hole of a tool pin from below, lift the tool pin up and remove the tool pins from the front head.
Insert the tool in the front head. Grease the shank and the impact area first.
Insert the tool pins, then fit the stop pin and the rubber plug or spring pin.
Drive the rubber plug or spring pin home with the hammer and press pin.

Removing the tool is the same steps in reverse.

Auger teeth and pilot

The manual says to check the cutting teeth and the pilot regularly. Its diagrams (page 26) show acceptable wear. Teeth and pilot that are worn too far can damage the auger and are listed in the manual as a cause of slow digging. Choose teeth and pilot that suit the ground. The manual gives no hour figure for them, so the check is by wear, not by the clock. Pins and clips for S4 and S5 are listed as separate articles.

How to order the right part

Have the model, the serial number and the spare part number of the attachment ready, and take photos of the whole attachment, the marking and the way the part is fitted. The same hitch or shaft size does not tell which tooth, pilot, pin or bushing fits. Contact us or see the wear parts page.

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