The Cub Cadet Big Country 6×4 Utility Vehicle Model 640 is a robust and versatile UTV designed for heavy-duty tasks and challenging terrains. This model features a powerful Honda 20 HP, 4-cycle gas engine that delivers a maximum torque of 32.5 lb-ft at 2500 rpm. With a displacement of 37.5 cubic inches (614cc), the engine is built for efficiency and durability, ensuring reliable performance across a range of applications.
The vehicle’s dimensions are designed to balance stability and maneuverability, with an overall length of 110.4 inches and a width of 65 inches. The high-back seats accommodate two passengers comfortably, and the vehicle boasts a payload capacity of 1,400 pounds, making it suitable for transporting heavy loads. The towing capacity stands at 1,200 pounds, further enhancing its utility.
Engine Specs
| Engine Make | Honda ** | Kohler |
| Engine Power | 20 hp | 20 hp |
| Maximum Torque | 32.5 lb-ft @ 2500 rpm | 32.6 lb-ft @ 2600 rpm |
| Engine Type | 4-Cycle Gas | 4-Cycle Gas |
| Cylinders | 2 | 2 |
| Valves | Overhead | Overhead |
| Engine Displacement | 37.5 cu. in. (614 cc) | 38 cu. in. (624 cc) |
| Ignition | Transistor Controlled | Transistor Controlled |
| Lubrication | Full Pressure | Full Pressure |
| Oil Filter | Replaceable (standard) | Replaceable (standard) |
| RPM, idle (no load) | 1400 rpm | 1250 rpm |
| RPM, fast (no load) | 3850 rpm | 3950 rpm |
| Cooling System | Air | Air |
| Air Cleaner | Heavy Duty, Replaceable, Dual Element | Heavy Duty, Replaceable, Dual Element |
** Cub Cadet Big Country 6×4 Utility Vehicle Model 640 / 37AS640C100
Electrical System
| Battery | 30 A/hr, 365 cold cranking amps |
| Alternator | 12 V 20 A Regulated |
| Headlights | Two 37.5 watt Halogen |
| Wiring | Automotive Style Fused Control System |
Dimensions
| Overall Length | 110.4” (280.4 cm) |
| Overall Width | 65.0” (165.1 cm) |
| Front-Tread Centers | 50.0” (127 cm) |
| Rear-Tread Centers | 52.0” (132.1 cm) |
| Overall Height | 41” (104.1 cm) |
| Wheel Base | 84.0” (213.4 cm) |
| Weight (including fuel/fluids) | 1,552 lbs. (704.2 kg) |
| Ground Clearance (Under Transaxle) | 6.4” (16.3 cm) |
| Ground Clearance (Under Foot Platform) | 7.5” (19.1 cm) |
| Seating Capacity | 2 persons |
| Seat Type | High Back |
| Turn Clearance Circle | 23.0 ft (7.0 m) |
| Towing Capacity | 1,200 lb (545.5 kg) |
| Payload Capacity | 1,400 lb (636.4 kg) |
Cargo Box
| Material | 14-Gauge Steel |
| Attachment | Rubber Isolated |
| Cargo Box Volume Capacity | 13.3 cu ft (0.38 m3) |
| Cargo Box Weight Capacity | 1,000 lb (453.6 kg) |
Transmission
| Transmission Type | Continuously Variable (CVT) |
| Differential Lock | Standard, Hand Operated |
| Max Speed | 19 mph (30.6 km/h) |
| Transaxle | Fully enclosed, Oil Bath |
| Gear Selection | Forward, Neutral, Reverse |
| Overall Reduction Ratio | Low: 73.8:1, High: 16.5:1 |
| Drive Chain | No. 60 Industrial Roller Chain |
| Rear Axle Housing | Welded Steel |
| Steering | Rack & Pinion w/ Ackerman-Type Geometry |
| Front Suspension | Independent, spring over shock, single A-arm |
| Rear Suspension | Fully Independent w/ Coil Over Shocks |
| Brakes | Wet Disk in Transaxle |
| Parking Brake | Foot Operated |
| Fuel Gauge | Located Under Seat |
| Low Fuel Indicator | Dash Indicator Light |
| Fuel Tank Capacity | 5.7 gal (21.6 L) |
Equipped with a Continuously Variable Transmission (CVT) and a standard hand-operated differential lock, the Big Country 6×4 UTV ensures smooth and controlled driving experiences. The fully independent suspension with coil-over shocks and the wet disk brakes in the transaxle provide excellent handling and stopping power.
Additional features include a 14-gauge steel cargo box with a capacity of 1,000 pounds and a volume of 13.3 cubic feet, as well as a 5.7-gallon fuel tank with a convenient dash indicator light for low fuel levels. The UTV also incorporates modern electrical components such as a 30-amp/hr battery, 12V-20amp regulated alternator, and two 37.5-watt halogen headlights, ensuring it meets the demands of both daytime and nighttime operations.
The Cub Cadet Big Country 6×4 Utility Vehicle Model 640 is engineered to provide superior performance, durability, and versatility for a variety of agricultural, industrial, and recreational uses.
got a used big country 6 wheel, I’m pretty sure fule pump is junk, looks like they replaced it… but, the one that’s on it is on the outside of gas tank and they put it on top of the gas tank.. question I have… is the fule pump supposed to be inside the gas tank, or did they modify it by putting a different type of fule pump on it.. thanks for any help
Hi, Barb. Sorry for the long reply. The fuel pump (KM-49040-2065) on the Cub Cadet Model 640 is located outside the fuel tank
my big country wont start. new battery, new spark plugs and plenty gas. Ran up until I parked it, went to start, wanted to turn over but not enough to start engine, did my replacements shown above, still nothing. the fuel is all good in the lines also. any idea
Hello Linda. Likely causes based on symptoms:
– Weak battery under load or poor cable connections
– Faulty starter or ignition switch
– Safety interlock not engaging
– Carburetor/fuel delivery issue
Since your Cub Cadet Big Country ran fine before, then wouldn’t start even after a new battery, spark plugs, and confirmed fuel flow, here’s how I’d troubleshoot it step by step:
1. Check Battery Voltage Under Load (Even a new battery can be weak). Use a multimeter:
12.6V or more = fully charged
12.2V–12.4V = borderline, may not start
Below 12.0V = too low, even if it spins the starter weakly
When cranking, voltage should not drop below 10V. If it does, the battery or connections may be the issue.
2. Inspect Battery Cables and Grounds:
– Corroded or loose cables can drop voltage to the starter.
– Remove, clean, and tighten both positive and negative terminals.
– Check the ground cable connection to the frame and engine block – poor grounds are a common cause.
3. Starter Motor & Solenoid – A failing starter can act weak even if it “clicks.”
– Tap the starter lightly with a hammer while someone cranks – if it starts, starter brushes may be worn.
4. Ignition Switch & Safety Interlocks (This model has neutral, brake, and possibly seat switch interlocks). Make sure:
– Transmission is in neutral
– Brake pedal is fully depressed
– Any seat or PTO safety switch is working properly
– If one fails, the starter circuit may be interrupted.
5. Check for Spark (Even with new plugs, no spark = no start)
– Pull a plug, ground it to the engine, crank — you should see a strong blue spark.
6. Fuel Delivery vs. Carb Issues (You said fuel is good in the lines, but if the carburetor float sticks or jets clog, it won’t start). Try a small squirt of starter fluid into the intake:
– If it fires, fuel delivery is the problem.
– If not, spark/compression is more likely.