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Kubota Z231 Zero Turn Mower Specs

Kubota Z231 Engine

Kubota Z231KW-42 Engine

Engine Model ............... Kawasaki FR651V (GH7302V)
Engine Type ............... 4-cycle vertical shaft V-twin OHV air-cooled gasoline engine
Number of Cylinders ............... 2
Cylinder Liners ............... Cast iron
Displacement, cu.in (cc) ............... 44.3 (726)
Cylinder Bore, in (mm) ............... 3.07 (78.0)
Piston Stroke, in (mm) ............... 2.99 (76.0)
Engine Power, Hp (kW) ............... 21.5 (15.9)
Rated Engine Speed, rpm ............... 3600
Maximum Torque, Nm (ft-lb) ............... 53.2 (39.2)
Torque Speed, rpm ............... 1800
Compression Ratio ............... 8.2:1
Fuel System ............... Carburetor
Carburetor Type ............... Float type with fixed main jet, single barrel
Fuel Pump ............... Diaphragm type pulse pump
Fuel Type ............... Gasoline (86 or higher)
Governor Type ............... Flyweight all speed governor
Lubrication System ............... Pressure feed by positive displacement pump
Cooling System ............... Forced-air
Oil Filter ............... Cartridge type full flow
Air Cleaner ............... Single stage element, dry type
Ignition System ............... Transistorized-flywheel magneto
Spark Plug Gap, in (mm) ............... 0.030 (0.76)
Armature Air Gap, in (mm) ............... 0.008-0.016 (0.20-0.41)
Intake Valve Clearance, in (mm) ............... 0.004-0.006 (0.10-0.15)
Exhaust Valve Clearance, in (mm) ............... 0.004-0.006 (0.10-0.15)
Fuel Tank Capacity, gal (L) ............... 3.6 (13.6)
Oil Capacity, qts (L) ............... 2.0 (1.9)

Kubota Z231BR-48 Engine

Engine Model ............... Briggs and Stratton 44S677 (GH7301V, GH731V-1)
Engine Type ............... 4-cycle vertical-shaft V-twin OHV air-cooled gasoline
Number of Cylinders ............... 2
Displacement, cu.in (cc) ............... 44.2 (724)
Engine Bore, in (mm) ............... 3.12 (79.0)
Engine Stroke, in (mm) ............... 2.89 (73.0)
Crankshaft Type ............... Straight
Maximum Engine Power, hp (kW) ............... 22.0 (16.4)
Rated Engine Speed, rpm ............... 3600
Idle Speed, rpm ............... 1400-1600
Cylinder Bore Type ............... Cast iron
Fuel System ............... Carburetor
Carburetor Type ............... Float feed
Fuel Pump ............... Integral type
Governor Type ............... Mechanical
Lubrication System ............... Full pressure with oil filter
Cooling System ............... Forced-air
Ignition System ............... Electronic Spark
Spark Plug ............... Champion RC12YC
Spark Plug Gap, in (mm) ............... 0.030 (0.76)
Armature Air Gap, in (mm) ............... 0.010-0.014 (0.25-0.36)
Air Cleaner ............... Multi-stage filter
Intake Valve Clearance, in (mm) ............... 0.003-0.005 (0.08-0.13)
Exhaust Valve Clearance, in (mm) ............... 0.005-0.007 (0.13-0.18)
Fuel Tank Capacity, gal (L) ............... 4.3 (16.3)
Oil Capacity, qts (L) ............... 2.0 (1.9)

Kubota Z231KH-48 Engine

Engine Model ............... Kohler Confidant ZT720 (GH7301V, GH736V)
Engine Type ............... 4-cycle V-twin cylinder OHV vertical shaft air-cooled gasoline engine
Number of Cylinders ............... 2
Displacement, cu.in (cc) ............... 44.2 (725)
Engine Bore, in (mm) ............... 3.27 (83.0)
Engine Stroke, in (mm) ............... 2.60 (67.0)
Rated Engine Power, hp (kW) ............... 21.0 (15.7)
Rated Engine Speed, rpm ............... 3600
Maximum Torque, Nm (ft-lbs) ............... 55.2 (40.7)
Torque Speed, rpm ............... 2800
Compression Ratio ............... 9.1:1
Fuel System ............... Carburetor
Carburetor Type ............... Fixed main jet
Fuel Pump ............... Pulse type
Governor Type ............... Mechanical
Lubrication System ............... Full pressure
Oil Filter ............... Full-flow type
Air Cleaner Type ............... Dual element
Ignition System ............... Electronic
Spark Plug Type ............... Champion RC12YC
Spark Plug Gap, in (mm) ............... 0.03 (0.76)
Module Air Gap, in (mm) ............... 0.008-0.012 (0.203-0.305)
Intake Valve Clearance, in (mm) ............... 0.004-0.006 (0.10-0.15)
Exhaust Valve Clearance, in (mm) ............... 0.004-0.006 (0.10-0.15)
Fuel Tank Capacity, gal (L) ............... 4.3 (16.3)
Oil Capacity, qts (L) ............... 2.0 (1.9)

Electrical System

Electrical System Rating, Volts ............... 12
Charging System ............... Alternator
Alternator Rating, Amps ............... 15
Starting System ............... Electric starter

Power Take Off

PTO Operational Type ............... Independent
PTO Clutch ............... Electric
PTO Speed, rpm ............... 3600

Kubota Z231 Transmission

Transmission Model ............... Hydro-Gear ZT-2200 or ZT-3100
Transmission Type ............... Dual hydrostatic
Number of Forward Gears ............... Infinite
Number of Reverse Gears ............... Infinite
Oil Capacity, qts (L) ............... 5.0 (4.7)
Maximum Forward Speed, mph (kph) ............... 8.0 (12.9)
Maximum Reverse Speed, mph (kph) ............... 4.0 (6.4)

Wheels and Tires

Drive Wheels ............... 2WD 4x2
Steering Configuration ............... Front steer
Steering System ............... 2-hand levers
Front Tire Size ............... 11x4.00-5
Rear Tire Size ............... 22x10.00-14
Rear Tire Size (Z231KW) ............... 18x7.50-10

Dimensions and Weight

Wheelbase, in (mm) ............... 45.5 (1155)
Wheelbase (Z231KW), in (mm) ............... 48.5 (1230)
Overall Length, in (mm) ............... 76.4 (1940)
Overall Length (Z231KW), in (mm) ............... 74.4 (1890)
Overall Heigth, in (mm) ............... 65 (1650)
Overall Heigth (Z231KW), in (mm) ............... 65.3 (1655)
Overall Width, in (mm) ............... 47.5 (1205)
Overall Width (Z231KW), in (mm) ............... 42.4 (1070)
Weight (Z231BR), lb (kg) ............... 728 (330)
Weight (Z231KH), lb (kg) ............... 750 (340)
Weight (Z231KW), lb (kg) ............... 620 (281)

Mower Deck

Mower Deck Model ............... RCK42P-122Z
Mower Deck Type ............... Mid-mount
Deck Construction ............... Fabricated
Number of Blades ............... 2
Cutting Width, in (mm) ............... 42 (1060)
Total Width, in (mm) ............... 55.1 (1390)
Cutting Height, in (mm) ............... 1.5-4.25 (37-108)
Blade Engagement ............... Electric
Blade Length, in (mm) ............... 21.5 (545)
Lift System ............... Mechanical, foot operated

Mower Deck Model ............... RCK48P-124Z
Mower Deck Type ............... Mid-mount
Deck Construction ............... Fabricated
Number of Blades ............... 3
Cutting Width, in (mm) ............... 48 (1220)
Total Width, in (mm) ............... 61.1 (1550)
Cutting Height, in (mm) ............... 1.5-4.5 (37-114)
Blade Engagement ............... Electric
Blade Length, in (mm) ............... 16.7 (425)
Lift System ............... Mechanical, foot operated