Komatsu Part BUSHING 8240-70-7123

—

Product Overview

The 8240-70-7123 BUSHING is a genuine Komatsu OEM replacement bushing. Bushings are the replaceable bearing surfaces at pivot points throughout your machine — boom connections, arm linkages, bucket pins, cylinder mounts, and track frame pivots all rely on bushings to provide a controlled wear surface between the pin and the structural bore. A bushing is intentionally designed to be softer than the pin and the housing, ensuring it wears first and can be replaced economically when clearance exceeds specification.

Part Number: 8240-70-7123 Part Name: BUSHING Part Type: OEM Komatsu Replacement Bushing Availability: In stock

—

The Replacement Decision

The economics of bushing replacement are straightforward if you understand the wear progression. When a new bushing is installed with the correct grease, wear is slow and linear — each thousand cycles removes a predictable amount of material. As clearance grows, loading transitions from distributed to concentrated, and the wear rate accelerates. The key decision point is whether the pin is still serviceable. A bushing that's worn beyond the service limit almost always means the pin has some wear too, though it may still be within specification. The most reliable results come from replacing the pin and bushing as a set — this restores the joint to factory clearance and ensures both components wear at the same rate.

—

When to Replace

• Rocking the joint reveals movement that exceeds the Komatsu specification
• The bushing bore is visibly oval or elongated rather than round
• Surface cracks, galling, or embedded debris visible on the bore
• Grease leaks past the bushing face rather than flowing through the designed clearance
• The mating pin shows any visible wear ridge — replace as a set

—

Installation

1. Confirm 8240-70-7123 in your Komatsu parts catalog
2. Press out the old bushing using a driver with the correct pilot diameter
3. Clean the housing bore — all old bushing fragments must be completely removed
4. Inspect the pin — replace if any wear is visible; pin and bushing wear together
5. Press the new bushing to the correct depth — align any grease holes or grooves
6. Apply assembly grease to the bore before inserting the pin
7. Pump fresh grease after assembly until clean grease purges at the seals, then cycle the joint

—

Request a Quote

Need the Komatsu 8240-70-7123 BUSHING? Contact us through the form or by phone, email, or WhatsApp. We respond within one business day.