Engine Specifications
Engine model – Kohler Command LT CV13S
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 – 10W30 / 5W30
Power (3600 RPM, corrected to SAE J1995) – 9.75 kW (13 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
Weight (approx.) – 39.54 kg (87 lb.)
Oil Capacity (approx.) – 1.9 L (2.0 U.S. qt.)
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)
Air Filter – Paper Element with Foam Pre-cleaner
Muffler Type – Anti-Backfire
Valve Adjustment – None (hydraulic lifters)
Oil Pressure (Minimum at 1250 rpm) – 124 kPa (18 psi)
Crankcase Vacuum (Minimum At Operating Temp.) – 25 mm (1 in.) Water
Movement
Automatic Compression Release Minimum Lift (Engine Cold) – 0.25 mm (0.01
in.)
Carburetor Slow Idle Mixture Screw Initial Setting – Lightly Seat, Then
1 Turn Out
Slow Idle Speed – 1650 ±75 rpm
Fast Idle Speed – 3350 ±50 rpm
John Deere STX38 Electrical System
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
John Deere STX38 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
Hydro Transaxle – Kanzaki
Hydro Transaxle Model – Tuff Torq K50 Transaxle
Type – Hydrostatic
Forward Speed – 0-9.3 km/hr (0-5.8 mph)
Reverse Speed – 0-4.7 km/hr (0-2.9 mph)
Brake Type – Single, External Disc Brake With Friction Pucks
Lubrication – John Deere Plus-4 10W30 Engine Oil, Class CD
Reservoir – Internal
Capacity – 1.6 L (3.4 pt)
JD STX38 Traction Drive Belt
Type – Hydro
Actual effective length – 2485±8 mm (97.8±0.3 in.)
Theoretical effective length (short) – 2477 mm (97.5 in.)
Theoretical effective length (long) – 2530 mm (99.6 in.)
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.)
Average Overall Weight (with mower deck/no fuel) – 195.05 kg (430 lbs)
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)
JD STX38 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.)
Wheels and Tires
Front Wheels – 6.0 x 4.50
Rear Wheels – 8.0 x 6.18
Front Tires – 13×6.50-6 NHS (2 ply)
Rear Tires – 18×8.50-8 NHS (2 ply)
Rear Tires – 18×9.50-8 NHS (2 ply)
Front Tires Pressure – 83 kPa (12 psi)
Rear Tires Pressure (with mower deck) – 55 kPa (8 psi)