Genie Counterbalance Valve 77303GT – Hydraulic Safety Valve for Z-45/25, S-60, S-85 Boom Lift

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Counterbalance Valve 77303GT (Hydraulic Load Holding Valve) – Optimized Product Page Content

Replacement Genie Hydraulic Counterbalance Valve 77303GT for Z-Series and S-Series Boom Lift Cylinders

🔹 Product Overview

The Counterbalance Valve with part number 77303GT (often cross-referenced as 77303) is a crucial, high-specification hydraulic safety component used in the main boom circuits of a vast array of Genie Articulating (Z-Series) and Telescopic (S-Series) Boom Lifts.¹ This valve is a load-holding device typically mounted directly onto a critical hydraulic cylinder (lift or telescope). Its primary function is to lock the cylinder’s position, preventing the boom from moving or collapsing under the weight of the boom/platform or due to a sudden loss of hydraulic pressure (e.g., hose failure).

This counterbalance valve is absolutely essential for the safety, stability, and control of the boom movement. The part number 77303GT is the necessary replacement for addressing dangerous issues such as boom drift, uncontrolled lowering, or jerky, unstable motion in the circuit it controls. A new, correctly specified valve is paramount for operator safety and machine compliance.

🔹 Key Features & Benefits

✅ Load-Holding Safety: Essential safety device that prevents cylinder creep, drift, or catastrophic collapse under load.

✅ Controlled Movement: Ensures smooth, controlled, and predictable movement when lowering or retracting the associated boom section.

✅ Broad Z/S-Series Fitment: Essential replacement for critical cylinders on popular models like the Z-45/25, S-60, and S-85.2

✅ Direct OEM Cross-Reference: High-quality aftermarket equivalent for Genie part numbers 77303GT and 77303.3

🔹 Technical Details

Detail	Specification
Part Number	77303GT (Also known as 77303)
Condition	100% new aftermarket replacement
Type	Hydraulic Counterbalance / Overcenter Valve
Function	Locks the cylinder rod’s position and provides controlled release when pilot pressure is applied.
Intended Use	Main Lift, Primary Boom, or Telescope Cylinders (Varies by application).
Application Location	Typically screws directly into the hydraulic port of a critical boom cylinder.
Warranty	12 months against manufacturing defects

🔹 Compatible Genie Models & Applications

The Counterbalance Valve 77303GT is a widely used, vital replacement part for the following Genie Boom Lifts:

Genie Equipment Series	Specific Compatible Models (Examples)
Z-Series (Articulating Boom)	Z-40/23N, Z-45/25, Z-51/30J, Z-60/37, Z-62/40
S-Series (Telescopic Boom)	S-40, S-45, S-60, S-65, S-80, S-85

Common Application: Crucial component for the load-holding circuit of the main boom cylinders, ensuring safe and stable positioning at height across a large portion of the Genie articulated and telescopic boom fleets.

🔹 Why Choose RQ Parts?

Safety Assurance: Guarantees the necessary load-holding safety feature is fully functional, protecting personnel and equipment.

Restore Control: Eliminates boom drift and ensures smooth, controlled motion during lift or lower operations.4

High Quality: Manufactured to resist internal leaks and ensure reliable valve operation under high pressure and load.

Competitive Pricing: Cost-effective solution for replacing complex, safety-critical hydraulic control components.

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Delivery Times

Average Delivery Time is 10-15 days within worldwide.
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General Returns: All returns must be requested within 30 days of invoice.
Please note that this refund policy applies to parts purchases only. There are no refunds available for equipment purchases.

General Returns: All return requests must be made within 30 days of the invoice date. Returned merchandise will ONLY be accepted with an issued Return Authorization number and must be returned within 30 days of issuing that Return Authorization number. Special-Order products, electronics, paints, chemicals, lubricants, LPG tanks, and fire extinguishers are non-returnable once ordered. Returned items must be sent to Shanghai RQMACHINE Equipment with freight prepaid.

All returns, except those involving a Shanghai RQMACHINE Equipment order or product error, will be subject to a 25% restocking charge per line item.

Merchandise returned as defective will be thoroughly tested and inspected. For items verified as defective, Shanghai RQMACHINE Equipment will, at its sole discretion, either repair or replace the merchandise at no charge, or issue a full credit for the defective merchandise, including freight. Merchandise returned as defective but found to be working properly will be subject to a testing fee and the 25% restocking charge per line item.

Credit will not be issued for merchandise damaged due to corrosive materials, abuse, alteration, or misuse.

Before returning any merchandise to Shanghai RQMACHINE Equipment, a Return Authorization Number must be obtained from our sales/customer service department.

Your request must include:

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Phone: +8618221399269