91-078 Mower Blade for John Deere M128485 — 20-7/8 in.
91-078 Mower Blade for John Deere M128485 — 20-7/8 in.
91-078 Mower Blade is a replacement mower blade with a profile intended to restore consistent cutting performance. Match the complete part number, mounting pattern, dimensions, and equipment configuration before ordering.
Purpose and Value
A worn, bent, or incorrect blade can leave uncut strips, tear grass, increase vibration, and reduce discharge quality. Correct geometry helps restore an even cut and limits avoidable spindle and deck vibration.
Verified Supplier Specifications
| Blade length | 20-7/8" |
|---|---|
| Blade width | 2.50" |
| Thickness | 0.312" |
| Center hole | 7/8" |
| Offset | 7/16 |
| Air lift | 7/8" |
Supplier-Verified Application Details
Requires 3 blades for 60" cut Fits many 7 iron decks Major brand replacement: John Deere Replace OEM No. M128485
Supplier Model and Replacement Guide
Model Fit Guide and Parts Cross Reference Fit Guide John Deere Replacement Guide J Thomas John Deere Laser Mowmore PLP Rotary Stens Sunbelt Product Details Requires 3 blades for 60" cut Fits many 7 iron decks Major brand replacement: John Deere Replace OEM No. M128485
Deck quantity guidance: Requires 3 blades for 60" cut Fits many 7 iron decks Major brand replacement: John Deere Replace OEM No. Confirm the exact deck configuration before ordering.
What One Purchase Includes
One blade. Multi-blade decks require the quantity stated for the exact deck.
Fitment Safeguard
Verify the complete OEM or replacement number, mower or engine model, serial range, deck size, mounting pattern, orientation, and required quantity. Similar-looking parts can differ in offset, rotation, hole pattern, thread, connector, or other critical details.
Installation and Service
No product-specific installation manual was verified in the supplier record. Follow the equipment manufacturer's procedure. For blades, stop the engine, remove the key, disconnect the spark-plug lead, secure the blade, wear cut-resistant gloves, install in the correct orientation, and torque hardware to the equipment manufacturer's specification.