Komatsu Dozer Right-Hand Door Glass for 12Y-978-3940 | Depco

📘 Overview

Komatsu dozer door glass replacement — right Hand Door Glass — the Komatsu replacement for OEM 12Y-978-3940. It covers 3 published Komatsu models, listed in full further down this page. The pane installs into the original cab frame using the factory glazing seal and retaining hardware, so no cab modification is required. Sold as a komatsu dozer door glass replacement and listed as a komatsu dozer door glass replacement, it is matched to the OEM number rather than offered as a universal fit.

⚙ Key Features of the Komatsu Dozer Right Hand Door Glass (OEM 12Y-978-3940)

• Direct interchange with OEM 12Y-978-3940 — same mounting points and same fit as the original Komatsu part
• One part number across 3 models spanning Komatsu dozers — one spare covers a mixed fleet
• Packed for crate — the shipping method Depco specifies for this part
• A true dozer right hand door glass — the komatsu right hand door glass is dimensioned from the original Komatsu part, not adapted from a similar one

🔑 Why Fit the OEM 12Y-978-3940 Right Hand Door Glass Replacement

• Restores the original sightline — cracked cab glass is a visibility and pre-start inspection failure, not a cosmetic problem
• Aftermarket pricing against a dealer pane with the identical cut and the identical mounting method
• Ordering a komatsu dozer by OEM number removes the guesswork — the right hand door glass replacement fitment on this page is published, not inferred

📊 Komatsu dozer door glass replacement Specifications — OEM 12Y-978-3940

Specification Value OEM part number 12Y-978-3940 Depco part number D12Y-978-3940 Part type Right Hand Door Glass Glass Length 28.5" Box Glass Width 16" Glass Height 56.5" Machine class Dozer Models covered 3 Installation Original cab frame, factory glazing seal Shipping method CRATE

🚜 Which Komatsu Models Take the OEM 12Y-978-3940 Right Hand Door Glass?

This is a machine-specific replacement part matched to OEM 12Y-978-3940, not a universal fit. Fitment follows the published model list below:

Machine group Models Komatsu dozers D12Y, 978, 1372

Find your model in the table above and verify the serial-number range before ordering. If your model is not listed, email support@eskidsteer.com or message us on chat with the machine model and serial number. Everything needed to confirm fitment is on this page — add it to your cart to check delivered pricing for your address.

🔗 Parts Often Bought With the 12Y-978-3940 Right Hand Door Glass

Komatsu owners replacing this right hand door glass commonly need one of these as well, all held in stock:

Part OEM number Why it is listed here Komatsu Dozer Left-Hand Door Glass for Various Models - D12Y-978-3930 OEM 12Y-978-3930 the opposite-hand part Komatsu Dozer Left-Hand Door Glass for Various Models - D12Y-978-1362| Depco OEM 12Y-978-1362 the opposite-hand part Komatsu Dozer Right-Hand Door Glass OEM 12Y-978-1372 the same part for other models

❓ OEM 12Y-978-3940 Right Hand Door Glass Questions, Answered