Kubota BX1850 Parts and Parts Market PDF

Kubota BX1850 Parts

The Kubota BX1850 is a compact utility tractor designed for versatility and efficiency in various agricultural and landscaping applications.

Powered by a reliable Kubota D722 three-cylinder diesel engine, the BX1850 delivers a maximum gross engine output of around 18 horsepower.

It features a hydrostatic transmission that provides smooth and easy operation, allowing users to control speed and direction with precision. The tractor is equipped with a three-point hitch, enabling the attachment of various implements and tools for tasks such as mowing, tilling, and hauling.

With its compact size and maneuverability, the BX1850 is suitable for small to medium-sized properties, making it a popular choice for homeowners, hobby farmers, and landscapers.

Kubota BX1850 Parts List

  1. Engine: The Kubota BX1850 is equipped with a D722 three-cylinder diesel engine, which is a vital component responsible for generating power to drive the tractor.
  2. Transmission: The tractor features a hydrostatic transmission that allows for smooth and easy control of speed and direction.
  3. Three-Point Hitch: The three-point hitch system enables the attachment of various implements and tools for tasks such as mowing, tilling, and lifting.
  4. PTO (Power Take-Off): The PTO provides power to the implements attached to the tractor, allowing them to perform their specific functions.
  5. Chassis and Frame: The tractor’s chassis and frame provide structural support and durability, ensuring stability during operation.
  6. Tires and Wheels: The tires and wheels contribute to the tractor’s mobility and traction on different terrains.
  7. Hydraulic System: The hydraulic system is responsible for powering hydraulic implements and controlling various tractor functions.
  8. Fuel System: This includes the fuel tank, fuel pump, and fuel filters, ensuring a consistent and clean fuel supply to the engine.
  9. Cooling System: The cooling system, consisting of a radiator and cooling fan, helps regulate the engine temperature to prevent overheating.
  10. Electrical System: Components like the battery, alternator, starter motor, and wiring make up the electrical system, providing power for starting the engine and operating electrical components.
  11. Operator Controls: The controls and instrumentation in the operator’s station, including the steering wheel, pedals, and levers, facilitate the tractor’s operation.
  12. Lights and Indicators: Lights and indicators contribute to safety and visibility during

Kubota BX1850 Body Parts

  1. Hood: The hood covers the front portion of the tractor and protects the engine.
  2. Fenders: Fenders are located on both sides of the tractor to provide protection and prevent debris from reaching the operator.
  3. Grille: The grille is positioned at the front of the tractor, allowing air to flow through and cool the engine.
  4. Rollover Protection System (ROPS): ROPS is a safety structure that helps protect the operator in the event of a rollover.
  5. Seat and Seat Pan: The seat and seat pan provide a comfortable and secure seating area for the operator.
  6. Instrument Panel: The instrument panel houses various gauges, indicators, and controls for monitoring and operating the tractor.
  7. Fender Flares: Fender flares may be present to provide additional coverage and protection for the tires.
  8. Fuel Tank Cover: A cover or panel may be present to protect the fuel tank.
  9. Footrests and Platform: Footrests and the operator’s platform provide a stable surface for the operator to stand or rest their feet.
  10. Rear Fender Extensions: Depending on the model, there may be rear fender extensions for added protection.
  11. Bumper: Some tractors may have a front or rear bumper for additional protection.
  12. Side Panels: These panels cover the sides of the tractor, enclosing various components for protection.

Kubota BX1850 Attachments

Some common attachments for the Kubota BX1850 include:

  1. Loader: A front-end loader attachment allows the tractor to handle materials like soil, gravel, and other heavy loads.
  2. Backhoe: A backhoe attachment adds digging capabilities to the tractor, making it useful for excavation and trenching.
  3. Mower Deck: Kubota offers mower decks that can be attached to the tractor for lawn mowing and maintenance.
  4. Tiller: A tiller attachment is used for soil preparation and cultivation, making it easier to plant crops or create garden beds.
  5. Box Blade: This attachment is useful for leveling, grading, and backfilling, particularly in landscaping applications.
  6. Snow Blower: A snow blower attachment allows the tractor to clear snow from driveways and pathways.
  7. Blade: Blades can be attached to the front or rear of the tractor for grading, leveling, and moving materials.
  8. Rotary Cutter: A rotary cutter or brush hog attachment is used for cutting tall grass, weeds, and light brush.
  9. Forks: Fork attachments can be added to the front-end loader for lifting and transporting pallets or other materials.
  10. Sprayer: A sprayer attachment is useful for applying pesticides, herbicides, or fertilizers to crops.
  11. Post Hole Digger: This attachment is designed for digging holes for fence posts or other similar applications.
  12. Grapple: A grapple attachment is used for handling logs, branches, or other materials, providing a secure grip.

Kubota BX1850 Backhoe

The backhoe attachment provides additional digging capabilities for tasks such as excavation, trenching, and other earthmoving applications.
Specs :
  1. Digging Depth: The BT601 backhoe typically offers a maximum digging depth, which is the depth to which the backhoe can reach into the ground.
  2. Bucket Options: Backhoe attachments often come with different bucket options for various digging applications.
  3. Subframe Mounting: The backhoe is usually mounted on a subframe that is attached to the tractor, providing stability and support during operation.
  4. Hydraulic Controls: The backhoe is controlled hydraulically, and the tractor typically requires a rear hydraulic outlet to power the backhoe.
  5. Swing Arc: The backhoe has a swing mechanism that allows it to pivot to the side, extending its reach.
  6. Stabilizers: Stabilizer legs are typically included to provide stability when the backhoe is in use.
  7. Transport Position: The backhoe can often be easily detached and raised to a transport position when not in use.

Kubota BX1850 Loader Lift Capacity

In general, the lift capacity for the Kubota LA203 loader on the BX1850 is approximately 500 to 600 pounds (227 to 272 kg) to a height of around 72 inches. The rear lift capacity of the tractor is specified as 670 lbs (303 kg) at 24 inches.
There is also a 3-point hitch lift capacity. This measures how much weight the tractor can lift through its rear 3-point hitch arms, and for the BX1850, it’s 661 pounds at 24 inches. This is a good general indicator of the tractor’s overall lifting capability.

Kubota BX1850 Common Problems :

Some common problems reported with the Kubota BX1850 include issues with the hydraulic system, such as foamy hydraulic fluid indicating air suction into the hydraulics on the suction side.

There have also been reports of fuel system issues, potentially related to computer malfunctions leading to power application and fuel control. Additionally, some owners have experienced a decrease in engine RPM, shaking, and black smoke emission after the tractor ran for a while.

Kubota BX1850 Hydraulic Problems :

Common hydraulic issues with the Kubota BX1850 reported by users include foamy hydraulic fluid, which may indicate air suction into the hydraulics on the suction side, leading to slow or spongy movement of the loader and bucket.

Additionally, there have been discussions about the hydraulic system not operating at idle, with normal operation resuming when the engine is revved up. These issues suggest potential problems with air ingress, fluid levels, or hydraulic pump performance.

The foaming of hydraulic fluid in a Kubota BX1850 can be caused by several factors.

According to BioBlend Lubricants & Industrial Products, foaming can lead to issues such as compromised lubrication, premature aging of the hydraulic fluid, and potential cavitation and pitting damage.

The formation of foam is often attributed to air entrainment, which can occur due to mechanical issues such as excessive aeration of the hydraulic fluid or the release of dissolved air as pressure drops.

Additionally, water contamination in the hydraulic oil, overfilling of the fluid, or loose hydraulic lines can also contribute to foaming issues

Kubota BX1850 stalls going up hills

Common issues and troubleshooting steps:

  1. Fuel System Issues:
    • Fuel Filter: Check the fuel filters for clogs or contaminants. Replace them if necessary.
    • Fuel Lines: Inspect fuel lines for any kinks or restrictions that may impede fuel flow.
  2. Air Intake System:
    • Ensure the air filter is clean and not clogged. A dirty air filter can affect the air-fuel mixture and engine performance.
  3. Exhaust System:
    • Check the exhaust system for any restrictions. A blocked exhaust can lead to poor engine performance.
  4. Engine Overheating:
    • Inspect the cooling system, including the radiator and coolant levels. Overheating can cause engine stalling.
  5. Transmission Issues:
    • Check the transmission fluid level and condition. Low or contaminated transmission fluid can impact performance on inclines.
  6. Throttle and Linkage:
    • Inspect the throttle linkage for any binding or sticking. Ensure smooth and responsive throttle operation.
  7. Ignition System:
    • Check the spark plugs for wear or fouling. Faulty spark plugs can lead to misfires and stalling.
  8. Battery and Charging System:
    • Ensure the battery is in good condition and the charging system is functioning properly. Electrical issues can affect engine performance.
  9. Hydrostatic Transmission:
    • If your tractor has a hydrostatic transmission, check for proper fluid levels and ensure there are no leaks.
  10. Fuel Quality:
    • Ensure that you are using clean and quality fuel. Contaminated fuel can lead to engine issues.
  11. Operator Technique:
    • Ensure you are operating the tractor within the recommended speed and load limits. Excessive loads on steep inclines can strain the engine.

Kubota BX1850 Power Steering Leak

How to address a power steering leak

  1. Locate the Leak:
    • Inspect the power steering system to identify the location of the leak. Look for visible signs of hydraulic fluid around hoses, connections, or the power steering pump.
  2. Check Hose Connections:
    • Ensure that all hose connections are tight and secure. A loose or damaged connection can lead to leaks.
  3. Inspect Hoses:
    • Examine the power steering hoses for any visible damage, such as cracks or abrasions. If you find damaged hoses, they may need to be replaced.
  4. Check Power Steering Pump:
    • Inspect the power steering pump for leaks around the pump housing and connections. If the pump is leaking, it may need to be repaired or replaced.
  5. Examine the Steering Cylinder:
    • If applicable, check the steering cylinder for leaks. Look for hydraulic fluid around the cylinder housing and connections.
  6. Fluid Level Check:
    • Check the power steering fluid level in the reservoir. Low fluid levels can indicate a leak. Top up the fluid if necessary, using the recommended hydraulic fluid for your tractor.
  7. Clean and Monitor:
    • Clean the affected area to remove any accumulated dirt or oil. After cleaning, monitor the area for new signs of leakage to identify the source.
  8. Seek Professional Assistance:
    • If you are unable to identify or fix the power steering leak, it’s advisable to seek professional assistance. Contact your local Kubota dealer or a qualified technician to inspect and repair the power steering system.
  9. Preventive Maintenance:
    • Regularly check the power steering system for leaks as part of your tractor’s preventive maintenance routine. This can help identify issues before they escalate.


What loader fits a Kubota BX1850

The Kubota BX1850 tractor is typically compatible with the Kubota LA203 front-end loader.
The LA203 loader is specifically designed for the BX series tractors, providing enhanced lifting capacity and versatility for various tasks. It’s essential to use loaders that are specifically engineered and tested for compatibility with a particular tractor model to ensure proper fitment, safety, and optimal performance.

How to change the oil on a Kubota BX1850

Changing the oil on a Kubota BX1850 tractor involves several steps. Here’s a general guide on how to change the engine oil:

Materials Needed:

  1. Engine oil (as per Kubota’s recommendations)
  2. Oil filter
  3. Oil drain pan
  4. Funnel
  5. Socket set or wrenches
  6. Oil filter wrench
  7. Shop rags or paper towels


  1. Gather Materials: Ensure you have all the necessary materials and tools ready.
  2. Warm Up the Engine: Run the engine for a few minutes to warm up the oil. Warm oil tends to drain more easily.
  3. Turn Off the Engine: Ensure the tractor is turned off, and the key is removed from the ignition.
  4. Locate the Oil Drain Plug: Underneath the tractor, find the oil drain plug. It is usually located on the engine oil pan. Consult your operator’s manual for the exact location.
  5. Place Oil Drain Pan: Position the oil drain pan underneath the drain plug to catch the oil.
  6. Remove the Drain Plug: Using a socket set or wrench, carefully loosen and remove the oil drain plug. Allow the oil to drain completely into the pan.
  7. Remove and Replace the Oil Filter: Use an oil filter wrench to remove the old oil filter. Before installing the new oil filter, apply a small amount of oil to the rubber gasket on top of the filter. Screw the new filter onto the filter base hand-tight.
  8. Install the Drain Plug: Once the oil has fully drained, clean the drain plug and its threads. Reinstall the drain plug securely.
  9. Refill with Oil: Locate the oil fill cap, typically near the engine. Using a funnel, add the recommended amount and type of oil for your tractor. Refer to your operator’s manual for specific oil capacity and specifications.
  10. Check Oil Level: Start the engine and let it run for a few minutes. Check for any leaks around the oil filter and drain plug. Turn off the engine and check the oil level using the dipstick. Add more oil if necessary.
  11. Dispose of Used Oil: Properly dispose of the used oil and the old oil filter at a recycling center or in accordance with local regulations.

How to change the fuel filters on a Kubota BX1850

Materials Needed:

  1. New fuel filters (primary and secondary)
  2. Wrenches or socket set
  3. Fuel-resistant gloves
  4. Rags or paper towels
  5. Drain pan (for catching fuel spills)


  1. Safety Precautions:
    • Ensure the tractor is turned off and the key is removed from the ignition.
    • Work in a well-ventilated area away from open flames or sparks.
  2. Locate the Fuel Filters:
    • Identify the primary and secondary fuel filters on your Kubota BX1850. The primary filter is usually located between the fuel tank and the engine, while the secondary filter is typically mounted on or near the engine.
  3. Prepare for Fuel Spillage:
    • Have a drain pan ready to catch any fuel that may spill during the filter change.
  4. Remove the Old Primary Fuel Filter:
    • Using a wrench or socket set, carefully loosen and remove the bolts securing the primary fuel filter housing.
    • Once the housing is removed, take out the old primary fuel filter.
  5. Drain the Fuel Separator (if applicable):
    • If your Kubota BX1850 is equipped with a fuel water separator, drain any accumulated water from it according to your tractor’s manual.
  6. Install the New Primary Fuel Filter:
    • Fill the new primary fuel filter with clean diesel fuel.
    • Install the new filter in the housing and secure it with the bolts.
  7. Remove the Old Secondary Fuel Filter:
    • Use a wrench or socket set to remove the old secondary fuel filter from its housing. Be cautious of any remaining fuel in the housing.
  8. Install the New Secondary Fuel Filter:
    • Fill the new secondary fuel filter with clean diesel fuel.
    • Install the new filter in the housing and tighten it securely.
  9. Check for Leaks:
    • After replacing both filters, visually inspect the fuel system for any signs of leaks around the filter housings.
  10. Prime the Fuel System (if needed):
    • Consult your tractor’s manual for instructions on priming the fuel system after changing the filters. This step is necessary to remove air from the fuel lines.
  11. Dispose of Old Filters and Fuel:
    • Properly dispose of the old fuel filters and any collected fuel in accordance with local regulations.

Kubota BX1850 Different Lever Functions :

  1. Throttle Lever:
    • Controls the engine speed. It is usually located near the steering wheel.
  2. Hydrostatic Transmission Pedal:
    • The hydrostatic transmission is controlled by a pedal. Pressing the pedal forward increases speed, while pressing it backward decreases speed.
  3. PTO (Power Take-Off) Lever:
    • Engages and disengages the PTO, which powers implements such as mowers or tillers.
  4. 3-Point Hitch Control Lever:
    • Operates the 3-point hitch system, allowing you to raise and lower attached implements.
  5. Differential Lock Pedal:
    • Engages the differential lock for improved traction in challenging conditions.


What is the horsepower of a Kubota BX1850

The Kubota BX1850 is equipped with an 18 horsepower (hp) Kubota D722 3-cylinder diesel engine

What is the weight of a Kubota BX1850

The weight of the Kubota BX1850 is 1,255 lbs (569 kg

What is the fuel capacity of a Kubota BX1850

The fuel capacity of the Kubota BX1850 is 6.6 gallons (25.0 liters)