The Genie 40658GT is a genuine OEM Flat Retaining Washer,.510 designed for a range of Genie and Terex equipment including TML-4000 and TML-4000N light towers, Z-45/25 and Z-45/25J IC Power articulating boom lifts, and Super Tower material lifts. As a direct OEM replacement, this washer is manufactured to the same specification as the original part, ensuring correct seating and retention performance in every application it covers. Cross-reference part number 40658GT against your parts manual to confirm fitment for your specific unit before ordering.
Key Features
- OEM-Spec Retention Surface — Manufactured to the original .510 diameter specification, delivering the correct load-bearing surface area for proper fastener retention without deformation under torque.
- Drop-In Replacement — Matches the original washer's dimensions exactly, so this part installs in the same position and orientation as the factory component with no rework needed.
- Broad Equipment Coverage — Fits Genie and Terex TML light towers, Z-series articulating boom lifts, and Super Tower material lifts, making it a useful stocking item across a mixed equipment fleet.
- Fastener Integrity at Every Service Interval — A correctly sized retaining washer distributes clamping load evenly across the mating surface; an undersized or worn washer allows fasteners to loosen prematurely, leading to assembly movement and accelerated wear on surrounding components.
- Aerial and Lighting Equipment Safety — On articulating boom lifts, structural and pivot fasteners must remain securely seated during operation. Using the correctly specified washer helps maintain the integrity of these connections as intended by the original design.
A flat retaining washer serves as the interface between a fastener head or nut and the surface it clamps against. By spreading the clamping force over a wider area, it prevents the fastener from pulling through or damaging the mating material and helps the assembly maintain the correct preload over time. When a retaining washer is missing, the wrong size, or worn thin, the fastener can work loose under vibration and load cycles — a particular concern on boom lifts and mobile equipment where structural connections are subject to repeated movement and stress.
Part Details
| Part Number | 40658GT |
|---|---|
| Brand | Genie |
| Part Type | Genuine OEM |
| Description | Flat Retaining Washer, .510 |
Compatibility & Fitment
| Name | Model |
|---|---|
| TML-4000 | TML-4000 |
| TML-4000N | TML-4000N |
| Super Tower | Super Tower |
| Z-45/25 | Z-45/25 |
| Z-45/25J IC Power | Z-45/25J IC Power |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
