The Genie 990880GT is a genuine OEM Star Lock Washer, 3/4 E designed for Genie and Terex portable light towers, including the AL4000, AL5000, AL4, AL5, AL5 with Vertical Mast, RL4, RL4000, and TML-4000. As a direct OEM replacement, this washer is manufactured to the same specifications as the original hardware installed at the factory, ensuring a correct fit with existing fastener assemblies. Cross-reference part number 990880GT against your parts manual to confirm fitment before ordering.
Key Features
- OEM-Grade Locking Retention — Sourced directly from Genie, this star lock washer delivers the same bite and holding force as the original hardware, preventing fastener loosening under vibration.
- Exact Hardware Match — The 3/4 E sizing matches the original fastener stack precisely, dropping into existing bolt patterns without any rework or shimming.
- Broad Light Tower Coverage — Fits a wide range of Genie and Terex portable and towable light tower models, including the AL4000, AL5000, RL4000, and TML-4000 series.
- Vibration-Resistant Fastening — Star lock washers are specifically designed to resist loosening caused by engine vibration and road travel, keeping structural and mechanical connections secure over time.
- Operational Safety Assurance — On light towers, loose fasteners in mast, frame, or generator mounting assemblies can create hazardous conditions; replacing worn or missing hardware with the correct OEM washer helps maintain structural integrity.
A star lock washer works by using its serrated or star-shaped teeth to bite into the mating surfaces of a bolt head and the component it secures, creating a mechanical lock that resists the rotational loosening caused by vibration. On portable light towers like those in the Genie AL and TML families, engine operation and towing over uneven terrain generate constant vibration that can gradually back out standard fasteners. When a lock washer wears flat, loses its teeth, or goes missing entirely, fastener joints can work loose, potentially affecting mast stability, generator mounting, or panel security — making prompt replacement with the correct hardware essential.
Part Details
| Part Number | 990880GT |
|---|---|
| Brand | Genie |
| Part Type | Genuine OEM |
| Description | Star Lock Washer, 3/4 E |
Compatibility & Fitment
| Name | Model |
|---|---|
| AL4000 | AL4000 |
| AL5000 | AL5000 |
| RL4000 | RL4000 |
| TML-4000 | TML-4000 |
| AL5 with Vertical Mast | AL5 with Vertical Mast |
| AL4 | AL4 |
| RL4 | RL4 |
| AL5 | AL5 |
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.
