The Genie 139798GT is a genuine OEM 12V Cummins B3.3T Starter designed for Genie S-series telescopic boom lifts and Z-series articulating boom lifts, including the S-100HD, S-120HD, S-125, and Z-135/70. As a factory-authorized replacement, this starter is built to the same specification as the unit it replaces, ensuring dependable engine cranking performance in the field. Verify part number 139798GT against your machine's parts manual to confirm it is the correct starter for your serial number and engine configuration. Compatible models also include the S-100, S-105, S-120, S-3200, and S-3800.
Key Features
- Genuine OEM Electrical Specification — Rated at 12V to match the exact electrical output and pinion engagement spec of the original Cummins B3.3T starter, eliminating guesswork on compatibility.
- Direct OEM Replacement — Mounts to the same bolt pattern and connector positions as the original unit, allowing a straightforward swap without modification.
- Broad Boom Lift Coverage — Fits multiple Genie S-series telescopic and Z-series articulating boom lift models, including the S-100HD, S-120HD, S-125, and Z-135/70, among others.
- Dependable Engine Cranking — A properly functioning starter delivers the torque needed to spin the Cummins B3.3T engine reliably at startup. A worn or failing starter can result in slow cranking, no-start conditions, or intermittent ignition failure that takes a machine out of service.
- Operational Safety — On large-platform boom lifts, a reliable start-every-time starter is essential. An engine that fails to crank predictably can strand an operator at height or delay a critical lift cycle.
The starter is the electric motor responsible for cranking the engine during ignition. When the operator turns the key or presses the start switch, the starter draws current from the battery to spin the engine flywheel fast enough for combustion to take place. On Cummins B3.3T-powered Genie boom lifts, the starter must deliver sufficient torque to turn the engine reliably under all operating conditions, including cold-weather starts. A starter that is slow to engage, fails to crank, or draws excessive current is a sign the unit needs replacement — and fitting the correct OEM part ensures the engine cranks with the same performance as when the machine left the factory.
Part Details
| Part Number | 139798GT |
|---|---|
| Brand | Genie |
| Part Type | Genuine OEM |
| Description | Starter, 12V, Cummins B3.3T |
Compatibility & Fitment
| Name | Model |
|---|---|
| S-100HD | S-100HD |
| S-120HD | S-120HD |
| S-3800 | S-3800 |
| S-3200 | S-3200 |
| S-120 | S-120 |
| S-125 | S-125 |
| S-100 | S-100 |
| S-105 | S-105 |
| Z-135/70 | Z-135/70 |
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.
