The Genie 990400GT is a genuine OEM Lock Washer, 1/4 ZP designed for Genie AL-series light towers, including the AL5000, AL5, AL5 with Vertical Mast, and AL5HT. Sourced directly from Genie, this hardware component matches the original specification used in factory assembly. Cross-reference part number 990400GT against your parts manual to confirm fitment before ordering. Built to the same tolerances as the hardware installed at the factory, this lock washer delivers the secure, consistent clamping performance your light tower depends on.
Key Features
- Genuine OEM Hardware Grade — Zinc-plated 1/4" construction meets the corrosion-resistance and hardness standards specified for Genie light tower assemblies, ensuring the washer holds its locking tension over repeated service cycles.
- Direct Drop-In Replacement — Sized and profiled to seat exactly as the original, this lock washer installs without rework or modification to the fastener stack.
- Confirmed Fitment for AL5-Series Light Towers — Compatible with the AL5000, AL5, AL5 with Vertical Mast, and AL5HT, covering the full AL5 product family in a single part number.
- Prevents Fastener Loosening Under Vibration — Light towers operate in high-vibration environments. A correctly functioning lock washer bites into the mating surface to resist fastener back-off, protecting structural and electrical connection points from working loose in the field.
- Electrical and Structural Safety Relevance — On light towers, loose fasteners at panel mounts, mast connection points, and generator brackets can compromise both structural integrity and electrical grounding — making this small component genuinely critical to safe operation.
A lock washer is a hardened, split or toothed ring placed under a nut or bolt head to resist loosening caused by vibration, thermal cycling, or dynamic loading. The washer's spring tension and bite into the mating surfaces create friction that keeps the fastener torqued to spec even as the machine moves or vibrates during transport and operation. When a lock washer is missing, deformed, or overly compressed from reuse, fasteners can gradually back off — leading to loose panels, unstable mast sections, or compromised electrical ground paths. Replacing worn or damaged lock washers with the correct genuine OEM part is a straightforward step that preserves the integrity of every assembly it secures.
Part Details
| Part Number | 990400GT |
|---|---|
| Brand | Genie |
| Part Type | Genuine OEM |
| Description | Lock Washer, 1/4 ZP |
Compatibility & Fitment
| Name | Model |
|---|---|
| AL5000 | AL5000 |
| AL5 with Vertical Mast | AL5 with Vertical Mast |
| AL5 | AL5 |
| AL5HT | AL5HT |
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.
