The Genie 993890GT is a genuine OEM Lock Washer, 5/8 ZP designed for Genie and Terex portable light towers, including the AL4000, AL5000, RL4000, and TML-4000. Sourced directly from Genie, this washer matches the original hardware specification used on the production line — ensuring it seats and torques correctly without any guesswork. Cross-reference part number 993890GT against your parts manual to confirm fitment before ordering. Whether you are completing a routine service or replacing worn fastener hardware, this lock washer is the correct, direct-fit solution for these light tower platforms.
Key Features
- Genuine OEM Hardware Grade — Zinc-plated 5/8 lock washer produced to the same hardness and dimensional tolerance as the original fastener hardware, ensuring consistent clamping force under vibration.
- Direct-Fit Installation — Matches the original bolt pattern and bore diameter used on these light tower assemblies, so the washer drops into place alongside the existing fastener stack without modification.
- Broad Light Tower Compatibility — Fits the Genie AL4000, AL5000, RL4000, and Terex TML-4000 portable light towers, covering a wide range of jobsite lighting equipment in one part number.
- Vibration Resistance — The locking profile bites into mating surfaces to resist fastener loosening caused by generator vibration and road travel — a common cause of fastener hardware failure on towable light towers.
- Structural Integrity at Critical Joints — Light towers rely on secure fastener assemblies throughout the mast, generator mount, and frame; a failed or missing lock washer at these joints can allow critical connections to work loose during operation, making correct hardware an important safety consideration.
A lock washer is a hardened ring placed beneath a nut or bolt head to prevent the fastener from backing out under load, vibration, or thermal cycling. On towable light towers like the AL4000 and TML-4000, components including the mast assembly, generator frame, and tow hitch are all subject to significant road vibration, which gradually loosens standard fasteners over time. The lock washer's split or toothed profile creates mechanical resistance against rotation, maintaining clamping force and keeping critical connections secure. When a lock washer is missing, deformed, or worn flat, fasteners can loosen progressively, potentially leading to structural movement or component damage that requires more extensive repair.
Part Details
| Part Number | 993890GT |
|---|---|
| Brand | Genie |
| Part Type | Genuine OEM |
| Description | Lock Washer, 5/8 ZP |
Compatibility & Fitment
| Name | Model |
|---|---|
| AL4000 | AL4000 |
| AL5000 | AL5000 |
| RL4000 | RL4000 |
| TML-4000 | TML-4000 |
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.
