The Genie 40665GT is a genuine OEM Counterbalance Valve designed for Genie telescopic and articulating boom lifts, including the S-80, S-85, Z-34/22 N, Z-34/22 DC, Z-34/22 Bi-Energy, Z-34/22 IC, and Z-30/20 N. As a factory-sourced component, this valve meets the exact specifications Genie engineers built into these machines from the start. Cross-reference part number 40665GT against your parts manual to confirm fitment before ordering. This is the direct OEM replacement for worn or failed counterbalance valves across the covered boom lift models.
Key Features
- OEM-Spec Hydraulic Calibration — Manufactured to the precise pressure ratings and flow tolerances specified for Genie boom lift hydraulic circuits, ensuring the valve opens and holds load at the correct thresholds.
- Drop-In Replacement — Ports, thread pattern, and body dimensions match the original, allowing installation directly into the existing hydraulic manifold without modification to fittings or lines.
- Broad Boom Lift Coverage — Fits Genie S-series telescopic booms (S-80, S-85) and Z-series articulating booms (Z-34/22 N, Z-34/22 DC, Z-34/22 Bi-Energy, Z-34/22 IC, Z-30/20 N) from a single part number.
- Controlled Load Holding — A correctly functioning counterbalance valve prevents uncontrolled boom drift or drop under load, keeping lift movements smooth and predictable during operation.
- Critical Safety Component — On aerial boom lifts, counterbalance valve integrity is directly tied to platform stability and load control. Using a genuine OEM part ensures the valve performs to the pressure and bypass specs the machine's safety system depends on.
A counterbalance valve is a hydraulic safety valve installed in the cylinder circuit of a boom lift. Its job is to hold a load in position by blocking return flow from the cylinder until a controlled pilot signal releases it — this prevents the boom from dropping or drifting if a hose fails or pressure is lost elsewhere in the system. When a counterbalance valve wears, leaks internally, or fails to hold its set pressure, the result can be slow or erratic boom movement, unintended lowering under load, or complete loss of position control — all of which compromise safe machine operation.
Part Details
| Part Number | 40665GT |
|---|---|
| Brand | Genie |
| Part Type | Genuine OEM |
| Description | Counterbalance Valve |
Compatibility & Fitment
| Name | Model |
|---|---|
| S-80 | S-80 |
| S-85 | S-85 |
| Z-34/22 N | Z-34/22 N |
| Z-34/22 DC | Z-34/22 DC |
| Z-34/22 Bi-Energy | Z-34/22 Bi-Energy |
| Z-30/20 N | Z-30/20 N |
| Z-34/22 IC | Z-34/22 IC |
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.
