The Genie 139798GT Starter, 12V, Cummins B3.3T is a genuine OEM starter built for Genie S-100HD, S-120HD, and Z-135/70 boom lifts. Sourced directly from Genie, this starter is engineered to the exact voltage and engine specification of the Cummins B3.3T powerplant fitted to these machines. Compatible with the S-100HD, S-120HD telescopic booms, and the Z-135/70 articulating boom, part number 139798GT cross-references directly against your machine's parts manual for a confident match.
Key Features
- Genuine OEM Cummins B3.3T Compatibility — Built to the precise 12V electrical and mechanical specification of the Cummins B3.3T engine, ensuring correct engagement, draw, and output from first crank.
- Direct OEM Replacement — Matches the original starter in mounting configuration, pinion geometry, and connector interface, so this component installs without adaptation.
- Broad Boom Lift Fitment — Fits Genie S-100HD and S-120HD telescopic booms and the Z-135/70 articulating boom, covering multiple high-reach Genie platforms running the B3.3T engine.
- Dependable Cold-Crank Performance — A correctly specified starter delivers the torque needed to turn over the B3.3T under load. A weak or failed starter means the machine will not start, taking the unit out of service entirely.
- Operational Safety Assurance — On large-platform boom lifts, a reliable starter is the first link in the ignition chain. Using a genuine OEM part maintains the integrity of the starting circuit and supports safe, predictable machine startup.
A starter motor converts electrical energy from the battery into the mechanical rotation needed to turn the engine over and initiate combustion. On Cummins B3.3T-powered Genie boom lifts, the 12V starter engages a ring gear on the flywheel, spins the engine to cranking speed, then automatically disengages once the engine fires. When a starter fails — through worn brushes, a seized solenoid, or a faulty drive pinion — the engine will not crank, leaving the machine inoperable until the unit is replaced. Fitting the correct OEM-specified starter ensures the cranking torque and electrical draw match what the Cummins B3.3T and the machine's electrical system were designed to handle.
Part Details
| Part Number | 139798GT |
|---|---|
| Brand | Genie |
| Part Type | Genuine OEM |
| Description | Starter, 12V, Cummins B3.3T |
Compatibility & Fitment
| Name | Models |
|---|---|
| S-100HD | S-100HD |
| S-120HD | S-120HD |
| 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.
