The Genie 66399GT is a genuine OEM Dielectric Grease, 4 oz, designed for the full range of Genie aerial lifts, telehandlers, and light towers. Sourced directly from Genie, this grease meets the exact formulation specified for electrical connector maintenance across the GS scissor lift line, S and SX telescopic boom lifts, Z and ZX articulating boom lifts, GTH telehandlers, TZ trailer-mounted booms, and AL and RL light towers. Keeping electrical connections properly protected is essential for consistent machine performance, and this 4 oz tube delivers the right compound in a ready-to-use size. Cross-reference part number 66399GT against your Genie parts manual to confirm fitment for your specific machine serial range.
Key Features
- OEM-Specified Formulation — The exact dielectric compound Genie calls out for electrical connector protection, ensuring the grease does not conduct current, attack connector plastics, or degrade seals over time.
- Direct Drop-In Application — Packaged in a 4 oz tube sized for field use; applies directly to connector pins, terminals, and wiring harness plugs without any mixing or modification.
- Broad Genie Fleet Coverage — Compatible with GS scissor lifts, S and SX telescopic booms, Z and ZX articulating booms, TZ trailer-mounted booms, GTH telehandlers, and AL and RL light towers, making it a practical stock item for mixed Genie fleets.
- Connector Protection Where It Counts — Seals terminals against moisture, road salts, and corrosive jobsite contaminants that cause resistance build-up, intermittent faults, and control-system errors.
- Electrical Safety Compliance — On aerial work platforms, degraded or corroded electrical connections can affect safety-critical functions including platform controls and interlock circuits; using the correct dielectric grease helps maintain the integrity of those systems.
Dielectric grease is a non-conductive, silicone-based compound applied to electrical connectors, terminals, and plug housings to seal out moisture and contaminants. By blocking water ingress and preventing oxidation on metal contacts, it keeps resistance levels at the connector stable and prevents the intermittent faults and fault codes that corroded terminals cause. When connectors go unprotected — especially on machines operating outdoors or in wet and dusty conditions — terminal corrosion can develop quickly, leading to erratic sensor readings, control failures, and unplanned downtime. Regular application during connector servicing is one of the simplest ways to maintain electrical reliability across a Genie machine's service life.
Part Details
| Part Number | 66399GT |
|---|---|
| Brand | Genie |
| Part Type | Genuine OEM |
| Description | Dielectric Grease, 4 oz |
Compatibility & Fitment
| Name | Model |
|---|---|
| AL5 with Vertical Mast | AL5 with Vertical Mast |
| RL4 Vertical Mast | RL4 Vertical Mast |
| RL4 LED Vertical Mast | RL4 LED Vertical Mast |
| AL4 | AL4 |
| AL5 | AL5 |
| IWP Super Series | IWP Super Series |
| AWP Super Series | AWP Super Series |
| S-80X | S-80X |
| S-80 | S-80 |
| S-85 | S-85 |
| S-60 | S-60 |
| S-65 | S-65 |
| S-60X | S-60X |
| S-60 XC | S-60 XC |
| S-60 HC | S-60 HC |
| S-60 TRAX | S-60 TRAX |
| S-65 TRAX | S-65 TRAX |
| SX-150 | SX-150 |
| S-65 XC | S-65 XC |
| S-60 HF | S-60 HF |
| S-65 HF | S-65 HF |
| SX-180 | SX-180 |
| SX-135 XC | SX-135 XC |
| S-40 | S-40 |
| S-45 | S-45 |
| S-80 XC | S-80 XC |
| S-85 XC | S-85 XC |
| S-80 HF | S-80 HF |
| S-85 HF | S-85 HF |
| SX-105 XC | SX-105 XC |
| SX-125 XC | SX-125 XC |
| S-40 XC | S-40 XC |
| S-45 XC | S-45 XC |
| S-40 TRAX | S-40 TRAX |
| S-45 TRAX | S-45 TRAX |
| S-40 HF | S-40 HF |
| S-45 HF | S-45 HF |
| S-60 J | S-60 J |
| S-80 J | S-80 J |
| S-60 FE Hybrid | S-60 FE Hybrid |
| S-60 DC | S-60 DC |
| S-60 FE | S-60 FE |
| S-85 XC FE | S-85 XC FE |
| S-85 XC E | S-85 XC E |
| GS-3384 | GS-3384 |
| GS-3390 | GS-3390 |
| GS-4390 | GS-4390 |
| GS-5390 | GS-5390 |
| GS-2046 | GS-2046 |
| GS-2646 | GS-2646 |
| GS-3246 | GS-3246 |
| GS-2032 | GS-2032 |
| GS-2632 | GS-2632 |
| GS-3232 | GS-3232 |
| GS-4047 | GS-4047 |
| GS-1530 | GS-1530 |
| GS-1532 | GS-1532 |
| GS-1930 | GS-1930 |
| GS-1932 | GS-1932 |
| GS-2669RT | GS-2669RT |
| GS-3369RT | GS-3369RT |
| GS-4069RT | GS-4069RT |
| GS-1330m | GS-1330m |
| GS-4655 | GS-4655 |
| GS-4046 | GS-4046 |
| GS-1332m | GS-1332m |
| GS-1432m | GS-1432m |
| GS-1932m | GS-1932m |
| GTH-636 | GTH-636 |
| GTH-844 | GTH-844 |
| GTH-1056 | GTH-1056 |
| GTH-1256 | GTH-1256 |
| GTH-1044 | GTH-1044 |
| GTH-1244 | GTH-1244 |
| GTH-1544 | GTH-1544 |
| TZ-34/20 | TZ-34/20 |
| TZ-50/30 | TZ-50/30 |
| TZ-50 | TZ-50 |
| Z-45/25 | Z-45/25 |
| Z-45/25J DC | Z-45/25J DC |
| Z-45/25J Bi-Energy | Z-45/25J Bi-Energy |
| Z-40/23N | Z-40/23N |
| Z-40/23N RJ | Z-40/23N RJ |
| Z-62/40 | Z-62/40 |
| Z-30/20 N | Z-30/20 N |
| Z-30/20N RJ | Z-30/20N RJ |
| Z-45/25J IC Power | Z-45/25J IC Power |
| ZX-135/70 | ZX-135/70 |
| Z-80/60 | Z-80/60 |
| Z-34/22 Bi-Energy | Z-34/22 Bi-Energy |
| Z-34/22 DC | Z-34/22 DC |
| Z-34/22 N | Z-34/22 N |
| Z-45 XC | Z-45 XC |
| Z-34/22 IC | Z-34/22 IC |
| Z-60/37 DC | Z-60/37 DC |
| Z-60/37 FE Hybrid | Z-60/37 FE Hybrid |
| Z-45/25 IC | Z-45/25 IC |
| Z-60 DC | Z-60 DC |
| Z-60 FE Hybrid | Z-60 FE Hybrid |
| Z-33 DC Power | Z-33 DC Power |
| Z-45 FE Hybrid | Z-45 FE Hybrid |
| Z-45 DC | Z-45 DC |
| Z-51/30J | Z-51/30J |
| Z-60 FE | Z-60 FE |
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.
