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Oil Cooler for Komatsu PC78UU-6, PC78US-6, PC78MR-6 Excavators

SKU:
21W-03-41120
FitsModel:
PC78MR-6 (S/N 1001-UP EU), PC78MR-6 (S/N 1001-UP NA), PC78UU-6 (S/N 22001-UP), PC78US-6 (S/N 4001-UP), PC78US-6 (S/N 4001-UP NA), PC78US-6 (S/N 4001-UP Overseas)
ListDescription:
Excavator Oil Cooler
Part # 21W-03-41120

Fits Models At A Glance:

  • Komatsu PC78MR-6 Series: PC78MR-6 (S/N 1001-UP – For EU), PC78MR-6 (S/N 1001-UP – For North America)
  • Komatsu PC78UU-6 Series: PC78UU-6 (S/N 22001-UP)
  • Komatsu PC78US-6 Series: PC78US-6 (S/N 4001-UP), PC78US-6 (S/N 4001-UP – For North America), PC78US-6 (S/N 4001-UP – Overseas Version)

Key Notes:

  • Part Number: 21W-03-41120
  • Dimensions: 32" L x 32" W x 10" D
  • Weight: 50 lbs
  • Application: Hydraulic oil cooler; manages hydraulic fluid operating temperature on Komatsu compact excavator
  • Material: Heavy-duty construction
  • Notes: EU, North America, and Overseas Version regional variants — confirm machine specification and region before ordering; PC78MR-6 is a minimum-swing-radius compact excavator — verify component compatibility before purchasing; all models are serial-number qualified — verify S/N range before purchasing
  • Location: Hydraulic cooling module on Komatsu PC78-6 series compact excavator

This is an aftermarket replacement part.

Why Choose Broken Tractor:

  • ✅ Three PC78-6 Variant Coverage – Fits PC78UU-6, PC78US-6, and PC78MR-6 across EU, North America, and Overseas regional specifications with one part number
  • ✅ Serial-Number Verified Fitment – S/N ranges clearly listed for each variant so you can confirm the correct cooler for your exact machine
  • ✅ Fast Shipping from a U.S.-Based Team – Processed and shipped quickly to minimize downtime on your compact excavator
$1,050.00

Shipping calculated at checkout. If any item in your order is temporarily unavailable, we'll contact you to arrange a back-order or refund — whichever you prefer.

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Do you need your part quickly? You're in luck! We have warehouses all over the country to ensure a quick and easy delivery time. Most of our parts ship from our warehouses the same day you place your order. And many times, orders are delivered in Two to Three days.

Our in house parts are manufactured following strict quality standards in our warehouse in Ohio. Parts such as hydraulic cylinders, pins, bushings, sheet metal, track adjusters, booms and dipper sticks are all ready to ship same day that they are purchased! With less time to wait for your shipment, you will be able to get back to work as quickly as possible.

Did you accidentally purchase the incorrect part? We offer returns and exchanges here at Broken Tractor. To proceed with a return, please call us toll free, and we will provide you with return authorization and a step by step return process for your convenience. We are more than happy to help you exchange your part for the correct one! Give us a call at 1-800-909-7060 and we would be pleased to help you.

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Product: Category: Brand: Head Title: Oil Cooler for Komatsu PC78UU-6, PC78US-6, PC78MR-6 Excavators