Komatsu Arm Pins & Bushings
Komatsu arm pins and bushings help control looseness between the boom, arm, bucket linkage, and hydraulic cylinder pivots. Use this WQC Parts page to research aftermarket Komatsu arm pivot components and confirm the right part number before repair work begins.
Arm Pivot Locations to Verify
Boom-to-Arm Joint
The main connection between boom and arm carries high digging loads and must match by serial range and configuration.
Arm Cylinder Pivot
Cylinder-end pivots depend on correct pin length, diameter, bushing size, retainers, and lubrication path.
Arm-to-Bucket Link Area
Wear at the bucket end can spread into the arm boss, links, H-link, bucket ears, or cylinder mount.
Why Serial Number Confirmation Is Important
Komatsu arm pins and bushings can vary by machine series, serial number, arm length, attachment arrangement, and regional specification. A PC200, PC220, PC300, or PC400 arm pivot search should be confirmed against the parts book or existing part number before ordering.
- Check the exact pivot location before comparing part numbers.
- Inspect the arm boss and linkage bores before installing new parts.
- Replace worn bushings and seals when the pin shows scoring, looseness, or grease contamination.
- Avoid assuming that similar-looking PC-series excavator parts are confirmed cross-references.
WQC Parts Fitment Help
WQC Parts can help match aftermarket Komatsu replacement arm pins and bushings using the part number, dashless search number, model, serial range, and photos. Selected pivot parts may be covered by the WQ Certified™ Komatsu Pivot Standard.
Common Questions
Can arm pins be ordered from measurements only?
Measurements can help, but they should be checked against the Komatsu part number and machine serial range when possible.
Should I inspect the bore before installing new arm bushings?
Yes. New pins and bushings cannot correct a stretched or damaged bore by themselves.
Need help confirming fitment? Send WQC Parts the Komatsu part number, machine model, serial number, and pivot location. We can help narrow the correct aftermarket replacement path before you order.