Hydro-Gear ZJ-GAEE-3B7B-1JLX ZT-3100 Integrated Transaxle

This is the working heart of one side of a zero-turn drive, and the complete build code determines whether it belongs on the machine. Hydro-Gear ZJ-GAEE-3B7B-1JLX is an integrated ZT-3100 transaxle for equipment originally fitted with this exact configuration.

The official family specifications describe the platform; shafts, controls, brake arrangement, orientation, and mounting are set by the full build code. Match the entire code before ordering.

Why this matters

• Integrated pump-and-motor construction creates a compact, serviceable drive package.
• Exact configuration matching protects steering response and installation alignment.
• Official product and service documents support informed maintenance planning.

Family specifications

Official Hydro-Gear resources

• ZT-3100 manufacturer page
• ZT-3100 product card (PDF)
• ZT-2800/3100/3200 service and repair manual (PDF)

Manual note: This is a family service manual, not mower-specific installation instructions.

Ordering, lead time, returns, and warranty

• Match the complete identification number on the original component and verify the mower model and serial number.
• Many HydroDrives-supplied units are built to order and may require approximately 10–15 business days before shipment.
• Approved returns may incur a 20% restocking fee; original and return shipping charges are nonrefundable.
• Build-to-order, installed, used, damaged, or fluid-filled components may be ineligible for return.
• Hydro-Gear warranty coverage may require installation by an authorized service center. Retain installation and service records.

Orders may ship directly from a U.S. partner warehouse. Availability and timing are subject to supplier confirmation.