Komatsu Part BUSHING 707-76-11220

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Product Overview

The 707-76-11220 BUSHING is a genuine Komatsu OEM replacement bushing from the 707 prefix series. Bushings are the sacrificial wear components at every pivot point in your machine — they provide the bearing surface between the pin and the housing, absorbing the friction and surface degradation that would otherwise scar and elongate the structural bore. Replacing a worn bushing is a standard maintenance procedure that restores the joint to factory clearance at a fraction of the cost of housing repair.

Part Number: 707-76-11220 Part Name: BUSHING Part Type: OEM Komatsu Replacement Bushing Availability: In stock

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The Wear Pattern

Bushings wear in a characteristic pattern. The load direction at most pivot joints is primarily in one direction — the bushing sees compressive force from the pin pushing against one side during the working stroke, then relaxes on the return. Over thousands of cycles, the bushing bore gradually becomes oval, with the largest wear at the primary load point and progressively less wear around the circumference. Once the clearance grows beyond the design limit, the load transitions from distributed contact to impact contact — the pin hammers against the bushing with each direction change, dramatically accelerating the wear rate. This is the transition point where a simple bushing change escalates to a pin replacement, and if left further, to housing damage.

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When to Replace

• Rocking the connected parts reveals movement — clearance has grown beyond the design limit
• The bushing bore is visibly oval or elongated, especially when the pin is removed
• Surface cracks, galling, or scoring are visible on the bore surface
• Grease purges from around the bushing face rather than through the designed clearance path
• The mating pin displays any visible wear ridge at the bushing contact zone

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Installation

1. Confirm 707-76-11220 in your Komatsu parts catalog
2. Press or drive out the old bushing using a driver with the correct pilot diameter
3. Clean the housing bore completely — all old bushing fragments must be removed
4. Inspect the pin — replace it if any wear ridge or surface damage is present
5. Press the new bushing to the correct depth — verify alignment of any grease grooves or holes
6. Apply assembly grease to the bushing bore before inserting the pin
7. Pump fresh grease after assembly until clean grease appears at the seals, and cycle the joint

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Request a Quote

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