Komatsu Pins & Bushings Technical Guide
Komatsu pins and bushings are simple parts with serious consequences. The right pin and bushing can keep a boom, arm, bucket linkage, loader linkage, or cylinder mount working properly. The wrong part can create looseness, accelerate bore wear, damage surrounding components, and turn a normal wear-part repair into a much more expensive machining or line-boring job.
This Komatsu Pins & Bushings Technical Guide from WQC Parts is designed to help equipment owners, mechanics, dealers, exporters, and repair shops research aftermarket Komatsu pins and bushings by part number, machine family, model, serial range, component location, and fitment details.
Built Better. Lasts Longer. Use this page to narrow the application first, then confirm the exact part number, dimensions, component location, and serial range before ordering.
Start Here
Use these WQC Parts hubs to move from a broad search into the correct machine family, system, and part category.
- Komatsu Parts Master Hub
- Komatsu equipment pins and bushings
- Shop Komatsu pins
- Shop Komatsu bushings
- WQ Certified™ Komatsu Pins and Bushings Standard
What This Guide Helps You Research
Komatsu fitment is rarely confirmed by description alone. Similar terms such as pin, bushing, spacer, washer, seal, or linkage hardware may refer to different parts depending on the machine serial number, component group, installed arrangement, and parts-book callout.
This guide is intended to help with research around common Komatsu pivot locations, including:
- Boom foot and boom cylinder pin areas
- Arm, stick, and bucket pivot locations
- Bucket link, bellcrank, and linkage wear points
- Loader lift-arm and bucket linkage locations
- Dozer blade, tilt, and frame pivot points
- Cylinder-end pins and bushings
- Bushings, thrust washers, spacers, seals, and related hardware
Why Pin and Bushing Fitment Matters
Pins and bushings carry load every time the machine digs, lifts, curls, pushes, or travels over uneven ground. When the pin and bushing fit correctly, the joint can articulate as intended and the surrounding structure is better protected.
When a joint becomes loose, the damage usually does not stop at the wear parts. Excess movement can enlarge the bore, damage the linkage, wear cylinder mounts, crack bosses, and create repair costs far beyond the price of a pin and bushing set.
Common signs of pin and bushing wear include:
- Visible movement in the bucket, arm, boom, or linkage
- Knocking or clunking under load
- Uneven grease movement around the joint
- Oval-shaped or worn bores
- Excessive play in the bucket or attachment
- Difficulty keeping the joint properly greased
- Premature wear on replacement parts after installation
How to Confirm the Correct Komatsu Pin or Bushing
The best starting point is always the original Komatsu part number. If the original part number is not available, confirm the machine model, serial number, application location, dimensions, and parts-book diagram before ordering.
Before ordering, check:
- Komatsu part number
- DASHED and non-dashed part-number formats
- Machine model and serial number
- Component group or parts-book section
- Diagram callout position
- Quantity required per machine or joint
- Pin outside diameter and overall length
- Bushing inside diameter, outside diameter, and width
- Whether thrust washers, spacers, seals, or hardware are also required
The same machine family can have different pin and bushing part numbers depending on serial range, market, arrangement, attachment, or component update. Do not rely on model name alone when ordering pivot parts.
Komatsu Bushing Checks
Bushings are especially sensitive to fit. A bushing that is too loose in the housing can move, spin, or damage the parent bore. A bushing with the wrong inside diameter can create improper running clearance with the pin. A bushing with poor surface finish can shorten pin life.
When checking a Komatsu bushing, confirm:
- Inside diameter for the matching pin
- Outside diameter for the housing or bore
- Bushing width
- Flanged or non-flanged design
- Grease groove, oil hole, or lubrication feature when applicable
- Whether the mating pin should also be replaced
- Condition of the parent bore before installation
When to Replace Pins and Bushings Together
Replacing only one side of the joint can sometimes create a short-lived repair. A new bushing running on a badly worn pin may wear faster. A new pin installed into a worn or loose bushing may still allow movement in the joint.
In many high-load locations, it is worth inspecting the pin, bushing, seals, spacers, thrust washers, and parent bore at the same time. The goal is not just to install a new part. The goal is to restore the joint so the machine can work without unnecessary movement.
WQ Certified™ Komatsu Pivot Standard
Selected WQC Parts pins and bushings are marked under the WQ Certified™ Komatsu Pivot Standard. This standard is used to identify aftermarket Komatsu pins and bushings that have been reviewed for material suitability, fitment, dimensional consistency, and heavy-equipment pivot use.
- WQ-KOM-PIN-01 applies to selected Komatsu replacement pins.
- WQ-KOM-BUSH-01 applies to selected Komatsu replacement bushings.
To learn more about what those standards mean, visit the WQ Certified™ Komatsu Pins and Bushings page.
Why Use WQC Parts
WQC Parts focuses on practical replacement paths for Komatsu equipment: clear model-family navigation, part-number research, serial-range caution, and WQ Certified sourcing standards.
Our goal is to help maintenance teams, dealers, exporters, repair shops, and equipment owners avoid wrong-part orders and keep machines working. If an exact Komatsu application is not shown as a live product listing yet, this guide helps buyers move toward the correct machine family, system, or quote path instead of guessing from a broad search result.
Need Help Finding the Right Part?
If this page does not show the exact product you need, send the Komatsu part number, machine model, serial number, photos, dimensions, or component tag information through the WQC Parts contact page.
We can help check availability, replacement options, and quote paths for WQ Certified™ aftermarket Komatsu pins, bushings, and related pivot parts.