14U-70-12120 Komatsu Pin

The 14U70‑12120 pin is a heavy‑duty steel pivot/fastener pin used in Komatsu machines to secure and align moving parts such as linkages, arms, buckets, or suspension components. It helps maintain precise movement while bearing load and resisting shear forces in critical mechanical joints.

Here’s a general installation guide:

1. Park the machine on level ground and shut off the engine before working.
2. Support the assembly (boom, linkage, bucket, etc.) to relieve load on the pin connection.
3. Remove any retaining hardware such as clips, bushings, or bolts.
4. Align the mating parts and carefully drive the old pin out using appropriate tools.
5. Clean the bore and mating surfaces of debris or corrosion.
6. Press or drive the new 14U70‑12120 pin into place, ensuring it seats fully and aligns correctly.
7. Reinstall any bushings, clips, or retainers and verify smooth movement.

Always refer to your equipment’s service manual for exact procedures and torque values.

The 14U70‑12120 pin is used wherever this specific part number is specified in Komatsu excavators, loaders, and construction machines. It’s typically found in linkage joints, bucket connections, track or suspension pivot points, and other heavy‑load pivot applications. Verify fitment using your parts manual before ordering. Please reach out to Propel Parts for help verifying fitment.

Yes. This pin is manufactured to match OEM quality standards for dimensional accuracy, strength, and wear resistance. Aftermarket versions like the one offered on Propel Parts are inspected for fit and performance to deliver reliable durability under heavy loads and demanding field conditions.

Pins should be checked during routine undercarriage or linkage maintenance or anytime associated assemblies are serviced. Inspect for wear, scoring, bend, corrosion, or play in the mating joint. Replace the pin when wear is evident to maintain precise alignment and prevent accelerated wear of bushings or connected components.

Typical indicators include:

1. Excessive play or looseness in the joint
2. Unusual noise (clunking, grinding) during movement
3. Visible wear, scoring, or flat spots on the pin surface
4. Corrosion or material deformation

A quality pivot pin ensures stable, precise movement across linked assemblies, reduces friction and wear, and supports consistent alignment of mechanical systems. Using parts that meet or exceed OEM specifications improves reliability, reduces maintenance costs, and contributes to long‑term equipment uptime and performance under heavy working conditions.