Hydro-Gear ZT-5400 Powertrain — 1015-1057R (representative image) Click to zoom

Hydro-Gear 1015-1057R ZT-5400 Hydrostatic Transaxle

MPN 1015-1057R

Replaces Ferris 5103963; Snapper 5103963, 5110534; Stihl WB05 640 0110

Free shippingIn stockHydrostatic Transaxle

Overview

Hydro-Gear 1015-1057R is a genuine Hydro-Gear ZT-5400 Powertrain hydrostatic transaxle. The ZT-5400 Powertrain is Hydro-Gear's largest transaxle — it "handles the biggest & toughest jobs."

Order by the full model number on the Hydro-Gear label (1015-1057R). 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.

Replaces / cross-reference: Ferris 5103963; Snapper 5103963, 5110534; Stihl WB05 640 0110. Confirm against your mower's parts list.

More on this series: Hydro-Gear ZT-4400 & ZT-5400 guide · Shop all ZT-4400 & ZT-5400 transaxles

Fits these mowers

Brand Model
Ferris ISX 3300
Simplicity Cobalt LE

Used as a pair with 1015-1057L on Ferris ISX 3300 and Simplicity Cobalt LE — check your label for which side you have.

Fitment from Hydro-Gear's cross-reference. Always confirm the number on your unit's label before ordering.

Specifications

Brand Hydro-Gear (genuine)
Model / part number 1015-1057R
Series ZT-5400 Powertrain
Type Hydrostatic Transaxle
Pump / motor displacement 16 cc/rev pump, 21.8 cc/rev motor (series spec)
Reduction 18.6:1 low speed, 12.9:1 high speed (series spec)
Input speed 3600 rpm max, 1800 rpm min (series spec)
Output torque (up to) 700 lb-ft (949 Nm) (series spec)
Speed (up to) 18 mph (series spec)
Max machine weight 2200 lb (997 kg) gross vehicle weight (series spec)
Axle 1.375 in; tapered, 4-bolt or 5-bolt flange (series spec)
Unit weight 57 lb (25.85 kg) (series spec)
Parking brake Internal disc (series spec)
Fluid 20W-50 engine oil; 164.8–166.5 fl oz (4875–4925 ml) (series spec)
Filter Hydro-Gear 71943 (25 micron nominal / 40 absolute)

Service notes

  • Oil and filter: 20W-50 engine oil (biodegradable oils are not approved) and Hydro-Gear filter 71943. First change at 100 hours, then every 400 hours or yearly, whichever comes first.
  • Hydro-Gear's oil service kit 72881 covers the ZT-4400 and ZT-5400.
  • 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 1015-1057R 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 1015-1001R. 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.