Komatsu Part SHIM 421-70-11470

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Product Overview

The 421-70-11470 SHIM is a genuine Komatsu OEM replacement shim from the 421 prefix series. Shims are precision-ground spacers that enable the exact dimensional adjustments required during assembly of gearboxes, final drives, bearing housings, pump assemblies, and other components where multiple machined parts must be assembled to a precise overall dimension. The difference between a correctly shimmed assembly and one where the shim pack was guessed rather than measured can be thousands of operating hours of service life versus premature failure.

Part Number: 421-70-11470 Part Name: SHIM Part Type: OEM Komatsu Replacement Shim Availability: In stock — ready to ship

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When to Replace

Replace the 421-70-11470 when the shim is physically damaged — bent, crushed, torn, or its precision surfaces show corrosion that affects thickness; when clearance or preload measurements during assembly indicate the existing shim pack is outside the specification range; when the assembly is being rebuilt and all shims must be measured and verified against Komatsu's published dimensions; or when the shim shows uneven wear patterns — this indicates the assembly has been operating with incorrect clearance and the shim has been subjected to abnormal loading.

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Installation

1. Confirm 421-70-11470 in your Komatsu parts catalog — verify the shim thickness against your measurement requirements
2. Clean the shim and all contact surfaces completely — even a thin film of oil or a microscopic particle of debris affects the final assembled dimension
3. Install in the correct position — note the stack order if multiple shims are being used together
4. Measure the resulting clearance or preload with a dial indicator, feeler gauge, or micrometer as specified in the Komatsu service manual
5. Adjust by adding or removing individual shims until the specification is achieved
6. Record the final shim pack thickness for future reference during the next rebuild

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Request a Quote

Need the Komatsu 421-70-11470 SHIM? Contact us through the form on this page, or reach us by phone, email, or WhatsApp. We respond within one business day.