How do I confirm pilotpart275827 fits my machine?

Compare the OEM or reference part number, machine model, engine model, and serial number. You can also submit a fitment inquiry before ordering.

In Stock

Engine Thermostat YM129150-49800 for Komatsu Engine 3D78N-1C 3D84N-2AA S3D84E-3A S3D84-2BA

For Komatsu Thermostat

Engine Thermostat YM129150-49800 for Komatsu 3D78N-1C Engine

OEM / REF: YM129150-49800SKU: pilotpart275827

Engine Thermostat YM129150-49800 for Komatsu Engine 3D78N-1C 3D84N-2AA S3D84E-3A S3D84-2BA is a Engine Thermostat replacement part indexed for Komatsu · 3D78N-1C and Komatsu · 3D84N-2AA, with 3 application records on file. Match OEM part number YM129150-49800 and confirm fitment for Komatsu Engine Spare Parts before...

Stock: In stock
Condition: New
Fitment: Komatsu Engine Spare Parts
Category: Thermostat

Fitment support before you order
Worldwide delivery options

In stock — ready to order

$147.99USD/EA

~~$21,099.00~~Save 99%

Estimated delivery by quantity

Estimated delivery windows
Qty	Estimated delivery
1	Oct 23 – Oct 30
10	Oct 21 – Oct 28
50	Oct 19 – Oct 26

Estimates from today; confirm exact lead time before payment.

Quantity

Buy online now or add to your quote list for bulk pricing and fitment confirmation.

Confirm fitment before ordering →

Lead times can vary by freight route and customs. Contact support for expedited shipping.

Thermostat Description

This Thermostat is indexed for Komatsu · 3D78N-1C; Komatsu · 3D84N-2AA; Komatsu · S3D84E-3A; Komatsu · S3D84-2BA. Compare reference number YM129150-49800 against the label on your existing Komatsu component before ordering.

Before checkout, compare OEM part number YM129150-49800, connector layout, mounting position, and machine serial number. For high-value or fitment-sensitive parts, submit the fitment form below so support can verify the match.

Part Numbers and Cross References

YM129150-49800

Applications

Komatsu · 3D78N-1C
Komatsu · 3D84N-2AA
Komatsu · S3D84E-3A
Komatsu · S3D84-2BA

Specifications

Part Number	YM129150-49800, YM12915049800

Fitment Notes

Brand or application signal: Komatsu Engine Spare Parts
Product family: Thermostat
System category: Engine Spare Parts > Lubrication & Cooling Systems > Thermostat
Recommended verification: OEM number, engine model, serial number, old part photos, and dimensions.

Shipping & Returns

Availability: InStock
Shipping: Shipping quotes can be confirmed before payment for heavy or urgent orders.
Returns: Returns are easier when fitment is confirmed before ordering.
B2B support: Bulk, fleet, and repair-shop requests can be handled through the inquiry form.

Frequently Asked Questions

How do I confirm this part fits my machine?

Match the OEM or reference number first, then verify machine model, engine model, serial number, connector layout, mounting points, and old part photos.

Can I order if my part number is not listed?

Yes. Send the old part number, machine plate, and photos through the fitment inquiry form. Support can review possible replacements or alternatives.

Is this an OEM part?

Products are indexed as replacement parts unless explicitly marked otherwise. Always compare reference numbers and confirm fitment before purchase.