Hydro-Gear ZT-3400 — Z9-WMJH-SL5B-1UXX (representative image) Click to zoom

Hydro-Gear Z9-WMJH-SL5B-1UXX ZT-3400 Hydrostatic Transaxle

MPN Z9-WMJH-SL5B-1UXX

Free shippingIn stockHydrostatic Transaxle

Overview

Hydro-Gear Z9-WMJH-SL5B-1UXX is a genuine Hydro-Gear ZT-3400 hydrostatic transaxle. The ZT-3400 is a Hydro-Gear integrated transaxle "designed for mid-size commercial vehicles."

Order by the full model number on the Hydro-Gear label (Z9-WMJH-SL5B-1UXX). Hydro-Gear builds each model to an OEM specification and advises against substituting a different model, so match every character; zero-turns use a left and a right unit — check which side you need.

More on this series: Hydro-Gear ZT-3400 guide · Shop all ZT-3400 transaxles

Specifications

Brand Hydro-Gear (genuine)
Model / part number Z9-WMJH-SL5B-1UXX
Series ZT-3400
Type Hydrostatic Transaxle
Pump / motor displacement 12 cc/rev pump, 16 cc/rev motor (series spec)
Input speed 3600 rpm max (no load), 1800 rpm min (series spec)
Output torque (up to) 500 lb-ft (677 Nm) (series spec)
Speed (up to) 10 mph (series spec)
Max machine weight 1600 lb (725 kg) gross vehicle weight (series spec)
Axle 1.125 in (28.56 mm); tapered, 4-bolt or 5-bolt flange (series spec)
Unit weight 34.5 lb (15.6 kg) (series spec)
Fluid 20W50 engine oil; 71.9 fl oz (2126 ml), or 56.6 fl oz (1674 ml) with internal expansion tank (series spec)
Filter External, Hydro-Gear 52114 (25 micron nominal / 40 absolute)

Service notes

  • Oil and filter: 20W50 engine oil and Hydro-Gear filter 52114 (hand-tighten 3/4 to 1 turn past gasket contact; 110–130 lb-in). First change at 75–100 hours, then every 400 hours.
  • Drain only when the oil is below 100 °F; units with an internal expansion tank can otherwise overfill and damage the breather.
  • After installing, purge air from the system following Hydro-Gear's procedure: wheels off the ground, cycle forward/reverse 5–6 times with the bypass open, then 5–6 times closed, and top up the oil.

Shipping and price

  • Free shipping (lower 48). Ships from distributor stock.
  • Low Price Guarantee: find a lower advertised price on a genuine Hydro-Gear Z9-WMJH-SL5B-1UXX and we'll beat it by 5% (before purchase). Details.

Frequently asked questions

Where do I find my Hydro-Gear model number?

On the Hydro-Gear label on the unit (on the transaxle). Current numbers look like ZX-GHEE-3K5A-13LX. See how to find your Hydro-Gear part number.

Can I use a different model that looks the same?

Hydro-Gear strongly discourages using any model not originally specified by the mower maker; similar-looking units can differ internally. Order the exact number on your label.