Product Description
**Milwaukee parts change not only by model# but also by serial number. To look up your tools parts break down on Milwaukee's website please click here:
Milwaukee Spring
Model Number: 40-50-0890
The Milwaukee 40-50-0890 Spring is a genuine OEM replacement part designed for the Milwaukee 2646-20 M18 2-Speed Cordless Grease Gun (serial code E98A). Identified as Figure 5 on Milwaukee's 2646-20 service parts bulletin, this small precision spring is positioned in the trigger and lock-on switch assembly area of the grease gun, working in conjunction with the Lock On-Off Shuttle (Milwaukee 42-42-0037), Switch Trigger (Milwaukee 45-72-0088), and adjacent plate springs to deliver the correct mechanical tension and detent action that the trigger and lock-on mechanism require for reliable operation. Milwaukee specifies a quantity of two of these springs per grease gun, so if you are replacing one due to wear, breakage, or loss of tension, it is good practice to inspect both positions and replace any showing similar wear at the same time.
A broken, fatigued, deformed, or missing spring at this location can cause the trigger to feel sloppy, the lock-on mechanism to fail to hold, or the trigger to fail to return cleanly to the rest position after release. These symptoms make the grease gun inconsistent and frustrating to use, and on a tool used for routine lubrication of equipment, vehicle, and machinery grease fittings, that inconsistency can lead to under-greased or over-greased service points. Replacing the spring with this OEM service part restores the correct mechanical tension and reliable trigger and lock-on function. Because Milwaukee Tool specifies replacement parts by both catalog number and serial number, always verify your tool's serial number against the official Milwaukee 2646-20 service parts diagram before ordering, since Milwaukee occasionally implements running production changes that affect part compatibility within the same catalog number. The 40-50-0890 is one of many Milwaukee springs sharing similar appearance in the 40-50-0xxx series, so confirming the exact part number called out for your tool's serial number is essential to avoid ordering the wrong spring. Verify by serial number using Milwaukee's online parts lookup before ordering to confirm correct fitment.
Features
- Genuine Milwaukee OEM replacement, direct factory part for the 40-50-0890 reference
- Designed for the Milwaukee 2646-20 (E98A) M18 2-Speed Cordless Grease Gun
- Small precision spring positioned in the trigger and lock-on switch assembly
- Works with the Lock On-Off Shuttle (42-42-0037), Switch Trigger (45-72-0088), and adjacent plate springs
- Milwaukee specifies a quantity of two of these springs per grease gun
- Restores correct trigger and lock-on mechanical tension and reliable detent function
- Manufactured to Milwaukee factory tolerances and spring rate specifications
- Direct-fit replacement, no modification required for installation
- Restores correct trigger function after breakage, fatigue, deformation, or loss of tension
Specifications
- Manufacturer: Milwaukee Tool
- Part Number: 40-50-0890
- Official Description: Spring
- Component Type: Trigger and Lock-On Switch Assembly Spring
- Primary Fitment: Milwaukee 2646-20 (E98A) M18 2-Speed Cordless Grease Gun
- Service Bulletin Reference: 2646-20 Service Parts List, Figure 5
- Quantity Required Per Tool: 2 springs per grease gun
- Quantity: Sold individually, 1 spring per order
- Part Type: OEM Service Replacement Part
Includes
- (1) Milwaukee 40-50-0890 Spring
- Note: Milwaukee specifies two of these springs per 2646-20 grease gun. Order quantity 2 if replacing both positions in the trigger and lock-on assembly
- Note: Verify your tool's catalog number (2646-20) and serial number against the official Milwaukee parts diagram before ordering
