O-ring for piston, replacement part for hammer drill model TMM1250 (19) — No name

O-ring for piston, replacement part for hammer drill model TMM1250 (19) is a circular sealing element manufactured to match the piston assembly of the TMM1250 hammer drill. It is intended to restore and maintain airtight and fluid-tight sealing inside the piston chamber, preventing loss of pressure that can reduce impact force or cause leakage during drilling and chiselling operations. The part is a basic consumable used during routine repair and maintenance to return the tool to correct working condition.

Advantages

This replacement O-ring provides a tight seal tailored to the piston geometry of the TMM1250 (19), helping to maintain consistent pressure and reliable impact performance. It minimizes the risk of air or fluid leakage that can lead to decreased efficiency or premature wear of other piston components. The simple design allows straightforward replacement during service, supporting cost-effective repairs without replacing the entire piston assembly.

Suitable for

• Repairing pressure loss or leakage in the piston chamber of the TMM1250 hammer drill
• Routine maintenance to restore optimal impact performance
• Replacing worn or damaged piston seals after extended use
• Workshop and field service tasks where maintaining sealing integrity is required

Key specifications

• Function: piston chamber sealing element for hammer drill
• Shape: circular O-ring profile designed to fit the specified piston assembly
• Material: elastomeric sealing material suitable for pneumatic/hydraulic pressure in power tools
• Compatibility: sized to match the mechanical dimensions of the TMM1250 piston assembly
• Application: sealing against air and fluid to maintain pressure and prevent leaks

How to use

To replace the piston O-ring, disassemble the hammer drill according to the manufacturer's service instructions until the piston assembly and old seal are accessible. Carefully remove the worn O-ring, clean the sealing groove and mating surfaces to remove debris and residues, then install the new O-ring ensuring it sits evenly in the groove without twisting. Reassemble the piston assembly and the tool, then perform a functional check to confirm correct sealing and restored impact performance. Use appropriate tools and follow safety procedures during disassembly and reassembly.

Usage recommendations

Use only O-rings that match the piston dimensions and material requirements for the TMM1250. Inspect related components such as the piston surface and housing for scratches or grooves that can damage a new seal, and replace any worn parts to ensure long-term sealing performance. Apply a light, compatible lubricant if recommended by the tool's service guide to ease installation and protect the seal during initial operation.