Engine Specifications
Engine model – Kohler Command LT CV12.5
Type – Gasoline, Air Cooled, Single Cylinder, 4-Cycle, Overhead Valves
Crankcase Oil Capacity (with filter) – 1.8 L (1.9 U.S. qt)
Oil Type – (Warm Climate) – 10W30 (Warm Climate) / 5W30 (Cold Climate)
Power (3600 RPM, corrected to SAE J1995) – 9.33 kW (12.5 HP)
Max Torque (RPM indicated) – 27.8 Nm (20.5 ft. lb.) /2500
Bore – 87 mm (3.43 in.)
Stroke – 67 mm (2.64 in.)
Displacement – 398 cc (24.3 cu. in.3)
Compression Ratio – 8.5:1
Compression Release – Automatic/Centrifugal
Crankshaft Type – Vertical (counterbalanced)
Weight (approx.) – 39.54 kg (87 lb.)
Oil Capacity (approx.) – 1.9 L (2.0 U.S. qt.)
Lubrication – Gerotor Pump (0—60 psi)
Oil Filter – Full Flow (W/O By-Pass Valve)
Oil – John Deere Turf-Gard
Lubrication Interval – 50 Hours First Change, Every 100 Hours After or
Yearly
Air Cleaner Base Nut Torque – 9.9 Nm (88 in.lb.)
Air Cleaner Wing Nut Torque – 1.5 Nm (12 in.lb.)
Angle of Operation – Maximum (at full oil level) Intermittent /
Continuous – 35 / 20 degrees
Carburetor – Walbro
Carburetor Type – Side Draft
Throttle/Choke – Unitized Control Linkage
Carburetor Fuel Shut-Off Solenoid (Optional) – Electric
Fuel Delivery – Gravity Flow
Fuel Filter – Replaceable Paper (in-line type)
Fuel Type – Unleaded (87 octane minimum)
Fuel Tank Capacity – 4.7 L (1.25 gal)
Fuel Shut-Off Valve – Replaceable (In-Line Type)
Fuel Shut-Off Solenoid (Optional) – Replaceable (Below Carburetor Float
Bowl)
Air Filter – Paper Element with Foam Pre-cleaner
Muffler Type – Anti-Backfire
Gasoline/Alcohol Blends – Up To 10% Ethyl Alcohol-90% Unleaded (By
Volume)
Gasoline/Ether Blends – Up To 15% MTBE-85% Unleaded (By Volume)
John Deere STX30 Electrical
Charging System – Flywheel/Electronic Magneto
Magneto Air Gap – 0.2-0.3 mm (0.008-0.012 in.)
Charging Capacity – 15 amp (regulated)
Spark Plug – Champion RC12YC
Spark Plug Air Gap – 1.0 mm (0.040 in.)
Battery Type – BCI Group, U1
Battery Reserve Capacity – 23 min. at 25 amp
Battery Cold Cranking Amp – 25 amp at 27C (0F) for 20 minutes
Battery Specific Gravity – Above 1.225 Points
Starter Type – Bendix Inertia Drive
PTO Clutch Type – Electric (Manufactured by Warner)
Fuel Shut-Off Solenoid (Optional) – Replaceable (Below Carburetor Float
Bowl)
Headlight Kit (Optional) – Two Bulbs-Each 12 Volt/23W/1.9 Amp Draw
JD STX30 Transaxle
Gear Transaxle – Dana
Transaxle Model – Spicer Heavy-Duty 4360 Transaxle
Type – Five-Speed/Linear Shift
Brake Type – Single, External Brake Disc With Dual Friction Pucks
Traction Drive Belt
Type – Gear
Actual effective length – 2660±8 mm (104.7±0.3 in.)
Theoretical effective length (short) – 2631 mm (103.6 in.)
Theoretical effective length (long) – 2710 mm (106.7 in.)
John Deere STX30 Chassis
Wheelbase – 1135 mm (44.69 in.)
Overall Length – 1524 mm (60 in.)
Overall Width (w/o mower deck) – 908 mm (35.75 in.)
Height – 980 mm (38.6 in.)
Horizontal Pull Maximum – 250 N (56 lbs)
Tongue Weight Maximum – 65 N (15 lbs)
Trailer Load Maximum – 136 kg (300 lbs)
Trailer Tongue Weight Maximum – 23 kg (50 lbs)
Steering
Steering Type – Manual-Pinion/Sector
Axle Pivot Hub – Shim Adjustable
Lubrication – DuBois MPG-2 Multipurpose Grease
Lubrication Interval – 10 hrs (maximum)
Toe-In – 6 mm (0.24 in.)-Non-Adjustable
Turning Radius – 584 mm (23 in.)
JD STX30 Wheels and Tires
Front Wheels – 6.0×4.50
Rear Wheels – 8.0×6.18
Front Tires – 13×5-6 NHS (2 ply)
Rear Tires – 18×6.50-8 NHS (2 ply)
Front Tires Pressure (with mower deck) – 83 kPa (12 psi)
Rear Tires Pressure (with mower deck) – 97 kPa (14 psi)