Exmark Zero-Turn Mower HydrosDrive System: Hydros

Our hydro drive system is how most things should be: painless. It’s exclusively designed to contain fewer parts and pieces, reducing maintenance and increasing durability. Take its unitized pump and wheel motor. They eliminate hoses and potential leak points. And the tow valves can be operated without the use of tools, not to mention that the customized valving provides smooth control. Like we said, painless.

Split System Hydro - 21cc

  • Used on Lazer Z D-Series
  • Pump: Hydro-Gear PW
  • Type: Axial piston
  • Displacement: 21.8 cc/rev
  • Motor: Sauer Danfoss OMEW 315
  • Type: Gerotor
  • Displacement: 310 cc
  • Peak Torque: 406 ft.lb
  • Reservoir: 2 quart, die cast aluminium


Split System Hydro - 12cc

  • Used on the Navigator
  • Pump: Hydro-Gear PK
  • Type: Axial piston
  • Displacement: 12.0 cc/rev
  • Motor: Hydro-Gear PRM-18
  • Type: axial piston with 2-stage planetary gear reduction
  • Effective Displacement: 295 cc/rev
  • Peak Torque: 692 ft.lb
  • Reservoir: 1 quart, die cast aluminium


Split System Hydro - 10cc

  • Used on Viking, Turf Tracer S-Series and X-Series, and Vantage
  • Pump: Hydro-Gear PE
  • Type: Axial piston
  • Displacement: 10.2 cc
  • Motor: Parker TE190
  • Type: Geroller
  • Displacement: 190 cc
  • Reservoir: 1 quart, die cast aluminium

UHT Hydro - 16cc

  • Used on Lazer Z X-Series with 60" and 72" Cutting Decks
  • Pump: Parker 16cc
  • Type: Axial piston
  • Displacement: 16.0 cc/rev
  • Motor: Parker
  • Type: Gerotor
  • Displacement: 280 cc/rev
  • Peak Torque: 684 ft.lb
  • Reservoir: 2 quart integral


UHT Hydro - 12cc

  • Used on Lazer Z E-Series, Lazer Z S-Series and Lazer Z X-Series with 48" and 52" Cutting Decks
  • Pump: Parker 12cc
  • Type: Axial piston
  • Displacement: 11.4 cc/rev
  • Motor: Parker
  • Type: Gerotor
  • Displacement: 240 cc/rev
  • Peak Torque: 684 ft.lb
  • Reservoir: 2 quart integral

ZT 3400

  • Used on 60” Pioneer and 30” Aerator
  • The ZT-3400® transaxle was designed for larger commercial applications. The ZT-3400’s large 12cc variable displacement seven piston pump and 16cc fixed displacement seven piston motor is capable of delivering up to 225 ft/lbs. of continuous torque. Power is routed through a mechanical gear reduction with a single 1.125 inch shaft output.  The ZT-3400 delivers smooth, infinitely variable speed and bi-directional control in a durable integrated package.
  • Fewer potential leak points for greater reliability
  • External oil filter for easier maintenance
  • Debris free internal brake

ZT 3100 Hydro - 10cc

  • Used on Pioneer S-Series
  • The ZT-3100® is designed for commercial applications and has these additional features:
    • Relief valve for added protection
    • Charge pump for increased durability and speed
    • Cut steel pinion for greater durability

ZT 2800 Hydro - 10cc

  • Used on Pioneer E-Series
  • The ZT-2800® has proven reliability and performance. The ZT-2800 is an integrated transaxle featuring Hydro-Gear’s popular 10cc variable displacement seven piston pump and a 16cc fixed displacement seven piston motor. Designed for residential applications, power is routed through a mechanical gear reduction with a single one inch shaft output.  The ZT-2800 delivers smooth, infinitely variable speed and bi-directional control in a compact rugged package.
  • Fewer potential leak points for greater reliability
  • External oil filter for easier maintenance
  • Heavy duty one inch shaft
  • Debris free internal brake

ZT 2200 Hydro - 10cc

  • Used on Quest with 50" Cutting Deck
  • The EZT® is Hydro-Gear’s most popular integrated unit and a proven performer in the consumer market. This integrated transaxle was designed to meet the demands of residential customers with heavier machines and greater horsepower. The EZT transaxle features a 10cc variable displacement seven piston axial pump and a 10cc fixed displacement five piston motor. Power is routed through a mechanical gear reduction with a single 1 inch axle to support heavier loads. The EZT delivers smooth, infinitely variable speed and bi-directional control in a compact lightweight package.
  • Low maintenance design
  • Fewer potential leak points for greater reliability
  • Outstanding operational efficiency
  • Large 7 in. fan keeps system cool

ZT 2100 Hydro - 10cc

  • Used on Quest with 42" Cutting Deck and 24” Aerator
  • The ZT-2100™ is a proven performer in the consumer market. This integrated transaxle was designed to meet the demands of residential customers. The heart of the ZT-2100™ is a 10cc variable displacement seven piston axial pump and a 10cc fixed displacement five piston motor. Power is routed through a mechanical gear reduction with a single shaft output. The ZT-2100™ delivers smooth, infinitely variable speed and bi-directional control in a compact lightweight package.
  • Low maintenance design
  • Fewer potential leak points for greater reliability
  • Excellent operational efficiency
  • Large 7 in. fan keeps system cool

Exmark® Premium Hydro Oil

Not all hydraulic oils are created equal. Most have been designed for the ever-changing automotive and truck market. Until now. Exmark recognizes the need for the right hydraulic oil specifically designed to perform under tough, commercial mowing conditions.

Today's higher-performing hydro systems require a premium oil to enhance control performance. To get that performance, Exmark has formulated an oil with twice the shear stability of competing oils. Field tested and proven, Exmark hydro oil will deliver superior anti-wear protection for any Exmark hydraulic system.

To back that up, Exmark will now honor our hydraulic warranty with change intervals two times longer (500 hours) than your current oil (250 hours) on new machines*.

See your Exmark dealer and ask for the right oil for your mower today — Exmark Premium Hydro Oil!

Download MSDS Sheet