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Kohler ZT720-3004 Vertical Confidant V-Twin Engine

The Kohler ZT720-3004 Confidant is a commercial-grade vertical-shaft engine engineered for zero-turn mowers, riding mowers, stand-on machines, and other professional turf equipment. This E16 marketing-spec engine combines a durable 725cc V-twin OHV design with 21 horsepower and 40.7 lb-ft of peak torque.

Key Features

  • Commercial-duty 725cc V-twin OHV engine
  • 21 horsepower
  • 40.7 lb-ft maximum torque
  • Vertical 1″ × 3-5/32″ keyed crankshaft
  • 1/4″ keyway
  • Drilled-and-tapped 7/16″-20 shaft end
  • Electric and recoil starting
  • 15-amp charging system
  • Heavy-duty cyclonic air cleaner
  • Full-pressure lubrication
  • Replaceable full-flow oil filter
  • Cast-iron cylinder liners
  • Remote throttle and choke controls
  • Pulse-type fuel pump
  • Consistent-Cut technology
  • Three-year limited manufacturer warranty

Specifications

Specification Details
Manufacturer Kohler / Rehlko
Product series Command PRO / Confidant
Model ZT720-3004
Manufacturer part number PA-ZT720-3004
Engine specification E16 marketing specification
Engine type Four-stroke OHV V-twin
Shaft orientation Vertical
Displacement 725cc (44.2 cu. in.)
Maximum power 21 HP (15.7 kW) at 3,600 rpm
Peak torque 40.7 lb-ft (55.2 Nm) at approximately 2,200 rpm
Number of cylinders Two
Bore × stroke 3.27″ × 2.64″ (83 × 67mm)
Compression ratio 9.1:1
Cylinder liners Cast iron
Cooling system Forced-air
Maximum governed speed 3,600 rpm
Fuel type Unleaded gasoline
Fuel delivery Carbureted
Fuel pump Pulse type
Fuel tank Not included
Ignition system Electronic CDI
Governor Mechanical
Starting system 12V electric and recoil
Charging system 15 amp
Throttle control Remote
Choke control Remote
PTO shaft type Straight and keyed
Shaft diameter 1″ (25.4mm)
Shaft length 3-5/32″ or approximately 3.16″ (80.3mm)
Keyway 1/4″
Shaft-end thread Drilled and tapped 7/16″-20
Shaft rotation Counterclockwise viewed from PTO end
Mounting pattern Approximately 10″ bolt circle
Lubrication system Full-pressure lubrication
Oil filter Replaceable full-flow filter
Oil capacity 2.0 US qt (1.9 L) with filter
Recommended oil SAE 10W-30 or viscosity appropriate for operating temperature
Air cleaner Heavy-duty cyclonic air cleaner with pre-cleaner
Grass screen Chopper-style debris screen
Muffler Not included
Approximate dimensions 18.6″ L × 17.8″ W × 13.9″ H
Approximate dry weight 91 lb (41.3 kg)
Maximum operating angle 25° with oil at the full mark
Warranty Three-year limited, unlimited-hour manufacturer warranty

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