Kubota KX121-3 Parts and Parts Manual PDF

Kubota KX121-3 Parts

The Kubota KX121-3 is a compact excavator known for its power, durability, and versatility. It features a load sensing hydraulic system that optimizes oil flow based on demand, enhancing efficiency. The machine has an operating weight of 9,063 pounds (4,111 kg) and is equipped with a Kubota V2203-M engine producing 42 hp (31 kW) at 2250 rpm.

Key features include a large cabin with optional air conditioning, easy maintenance, and a Kubota anti-theft system. The KX121-3 has a digging depth of 3,510 mm and offers excellent stability with proportional control for the auxiliary circuit.

Regarding pricing, the current market value for a Kubota KX121-3 is approximately $45,999 for a new model. Rental options are also available, with daily rates at $275, half-day at $198, and weekly at $825. For those in the UK market, a used KX121-3 Alpha model is listed at £15,995.

Kubota KX121-3 Specs

The Kubota KX121-3 is a compact excavator with the following key specifications:

– Operating Weight: 9,063 pounds (4,111 kg)
– Engine: Kubota V2203-M diesel engine
– Engine Output: 42 hp (31 kW) at 2250 rpm
– Fuel Capacity: 16.9 gallons (61 liters)
– Hydraulic Pump Flow Capacity: 25 gallons/minute (95 liters/minute)
– Hydraulic System Fluid Capacity: 17.7 gallons (64 liters)
– Max Digging Depth: 11.5 feet
– Width to Outside of Tracks: 5.58 feet
– Ground Clearance: 1.09 feet
– Max Travel Speed: 3.1 mph

The KX121-3 features a load sensing hydraulic system that optimizes oil flow based on demand, enhancing efficiency. It offers excellent stability and proportional control for the auxiliary circuit. The machine comes with a spacious cabin that has optional air conditioning and a digital panel for easy monitoring.

For versatility, the KX121-3 can be equipped with various bucket types including digging buckets, trenching buckets, and grading buckets. It also features a two-pattern selection system (TPSS) allowing operators to switch between ISO and SAE operating patterns.

Regarding pricing, a new Kubota KX121-3 is priced at approximately $45,999. Rental options are also available, with daily rates at $275, half-day at $198, and weekly at $825.

Kubota KX121-3 Weight

The Kubota KX121-3 has an operating weight of 9,063 pounds (4,111 kg). This weight makes it a compact yet capable mini excavator, suitable for various construction and landscaping tasks while still being relatively easy to transport and maneuver on job sites.

Kubota KX121-3 Fuel Capacity

The fuel capacity of the Kubota KX121-3 is 16.9 gallons (64 liters).

Kubota KX121-3 Tracks

The Kubota KX121-3 uses rubber tracks with the following specifications:

– Track size: 350×54.5×86 mm
– Width: 14 inches (350 mm)

Pricing for replacement tracks varies among suppliers:

– Ontrac Parts offers a pair for $1,135.00 with free shipping
– United Skid Tracks sells a single track for $1,275.00 with free shipping
– Fortis HD prices their tracks at $1,436.00 with free shipping
– Riverview Track & Materials has a premium duty track priced at $982.00 with free shipping

For Canadian customers, Rubber Track Canada offers tracks for CA$1,510.00.

These tracks are designed to meet OEM specifications and are made with high-quality rubber compounds and steel cord technology for durability and longevity. They are engineered to prevent issues like dry rotting and tearing, even in challenging terrain.

Most suppliers offer warranties on their tracks, with Ontrac Parts providing a 12-month or 1,000-hour pro-rated warranty for skid steer tracks and an 18-month or 1,500-hour pro-rated warranty for mini excavator tracks against factory defects.

When purchasing, it’s important to verify the exact size needed for your specific Kubota KX121-3 model, as there may be slight variations. Many suppliers offer free shipping and discounts for purchasing pairs of tracks.

Kubota KX121-3 Rubber Tracks

The Kubota KX121-3 uses rubber tracks with the following specifications:

– Track size: 350×54.5×86 mm
– Width: 14 inches (350 mm)

Pricing for replacement tracks varies among suppliers:

– Ontrac Parts offers a pair for $1,135.00 with free shipping
– AMT Equipment Parts & Tracks sells a pair for $2,142.35 with free shipping
– Rubbertrax prices a single track at $1,250.00 with free shipping
– Prowler MFG offers a track for $1,296.90 with free shipping

For Canadian customers, Rubber Track Canada offers tracks for CA$1,510.00.

These tracks are designed to meet OEM specifications and are made with high-quality rubber compounds and steel cord technology for durability and longevity. They are engineered to prevent issues like dry rotting and tearing, even in challenging terrain.

Ontrac Parts provides a 12-month or 1,000-hour pro-rated warranty for skid steer tracks and an 18-month or 1,500-hour pro-rated warranty for mini excavator tracks against factory defects.

When purchasing, it’s important to verify the exact size needed for your specific Kubota KX121-3 model, as there may be slight variations. Many suppliers offer free shipping and discounts for purchasing pairs of tracks.

Kubota KX121-3 Bucket

The Kubota KX121-3 has several bucket options available, varying in size and purpose:

1. Digging Buckets:
– 12″ (300mm) bucket: Priced between $814 and $1,379, depending on the supplier.
– 16″ (400mm) bucket: Available for $1,267.
– 18″ (450mm) bucket: Priced at $1,299 to $1,360.
– 24″ (600mm) bucket: Also available, though pricing is not provided in the search results.

2. Specialty Buckets:
– Ditch Cleaning Bucket: 36″ (915mm) wide, designed for cleaning and grading tasks.
– Riddle/Shaker Bucket: 30″ (760mm) wide, used for sifting and separating materials.
– Grading Beam/Ditching Beam: Available in 48″ (1200mm) or 60″ (1500mm) widths
– Tilt Grading Bucket: 36″ (915mm) wide, with tilting capability for precise grading work

3. Other Attachments:
– Ripper Tooth: For breaking up hard soil or rock.
– Land Rake: 48″ (1200mm) wide, useful for landscaping and ground preparation.

Most of these buckets and attachments are designed to be compatible with Kubota’s Quick Attach system, allowing for easy switching between tools. Prices generally range from about $800 to $1,400, with free shipping offered by many suppliers.

When selecting a bucket, consider the specific tasks you’ll be performing and the width that best suits your needs. The 12″ bucket is popular for general digging, while wider buckets are better for grading and cleaning tasks.

Kubota KX121-3 Problems

The Kubota KX121-3 mini excavator has experienced several reported issues:

1. Engine Problems:
– Bogging and stalling issues, particularly after periods of inactivity.
– Fuel delivery problems, which may occur even after major repairs like head replacement.

2. Hydraulic System Issues:
– Blade drifting down constantly, making it ineffective for grading tasks.
– Hydraulic performance degradation when the system gets hot, affecting the machine’s ability to turn on its tracks.

3. Track Movement Problems:
– Difficulty in turning once the hydraulics heat up, limiting the excavator to only forward and backward movement.

4. Travel Lever Malfunction:
– Issues with the left travel lever not returning to neutral position.

5. Potential Internal Damage:
– In some cases, fine metal particles or debris found in the hydraulic filter may indicate pump or other internal component problems.

These issues can significantly impact the excavator’s performance and reliability. It’s worth noting that proper maintenance, regular inspections, and timely repairs can help prevent or address many of these problems. If experiencing any of these issues, it’s advisable to consult with a qualified Kubota technician or heavy equipment mechanic for diagnosis and repair.

Stalling

There are several common causes of stalling issues in the Kubota KX121-3:

1. Fuel system problems:
– Clogged or dirty fuel filters
– Water or contaminants in the fuel tank
– Fuel delivery issues, possibly related to the fuel pump or injectors

2. Engine issues:
– The engine may bog down and stall when under load or when hydraulic functions are engaged
– Problems can persist even after major repairs like head replacement

3. Hydraulic system problems:
– When the hydraulic system heats up, it can affect the machine’s performance, potentially leading to stalling

4. Air intake issues:
– Dirty or clogged air filters can contribute to engine performance problems

5. Fuel quality:
– Using old fuel or fuel that has degraded over time can cause stalling issues

6. Mechanical problems:
– Internal damage to components like pumps or other parts can lead to performance issues and stalling

To diagnose and address these issues, it’s recommended to:

– Check and replace fuel filters regularly
– Inspect the fuel system for contamination
– Ensure proper maintenance of the air intake system
– Use fresh, high-quality fuel
– Have the hydraulic system inspected for leaks or worn components
– Consider professional diagnosis if problems persist after basic troubleshooting

Here are some ways to check if your fuel injectors are dirty or clogged:

1. Listen for clicking sounds: Use a mechanic’s stethoscope or long screwdriver to listen for clicking sounds from each injector while the engine is running. A lack of clicking may indicate a clogged injector.

2. Check fuel pressure: Use a fuel pressure gauge to measure fuel pressure at the fuel rail. Low or fluctuating pressure could indicate clogged injectors.

3. Perform a visual inspection: Remove the injectors and visually inspect the nozzle tips for buildup or debris.

4. Conduct a balance test: Use a fuel injector pulse tester to compare the spray pattern and volume from each injector. Uneven patterns may indicate clogs.

5. Monitor engine performance: Watch for symptoms like rough idling, misfires, poor acceleration, or decreased fuel economy, which can indicate dirty injectors.

6. Use a scan tool: Check for fuel trim codes or misfires that could be related to injector issues.

7. Perform a leak-down test: Use a special tool to pressurize the fuel system and check if injectors hold pressure or leak.

8. Check exhaust emissions: Excessive hydrocarbons in the exhaust can indicate incomplete fuel combustion due to clogged injectors.

9. Use an infrared temperature gun: Check the temperature of each exhaust runner – a significantly cooler one may indicate a clogged injector on that cylinder.

If you suspect dirty or clogged injectors, it’s best to have them professionally cleaned and flow-tested for optimal results.

If the issue continues after attempting these solutions, it may be necessary to consult with a qualified Kubota technician or heavy equipment mechanic for a more thorough diagnosis and repair.

Kubota KX121-3 Maintenance

Key maintenance points for the Kubota KX121-3 mini excavator:

1. Regular oil and filter changes:
– Engine oil and filter
– Hydraulic oil and filter
– Drive motor oil

2. Air filter inspection and replacement:
– Check the air filter regularly for dust and debris
– Clean or replace as needed

3. Fuel system maintenance:
– Change fuel filters according to the maintenance schedule
– Clean the fuel sediment bowl
– Use high-quality fuel and consider fuel additives to prevent contamination

4. Hydraulic system:
– Monitor hydraulic performance and address any issues promptly
– Check for leaks or worn components

5. Track maintenance:
– Inspect tracks for wear and proper tension
– Adjust or replace as necessary

6. General lubrication:
– Grease all pivot points and moving parts regularly

While specific intervals are not provided in the search results, it’s generally recommended to perform major maintenance checks around 500-600 hours of operation. For a machine with 496 hours, as mentioned in the search results, it would be advisable to:

1. Request the full maintenance history from the dealer
2. Perform a comprehensive inspection and service, including all fluid and filter changes
3. Address any pending maintenance items as part of the purchase agreement

It’s important to consult the operator’s manual for exact maintenance schedules and procedures, as these can vary depending on the specific model and operating conditions. Regular maintenance is crucial for preventing issues like the fuel delivery problems and engine bogging mentioned in the search results.

Kubota KX121-3 Service Manual

1. Availability:
The Kubota KX121-3 service manual is available in various formats:

– PDF download: A complete service manual can be downloaded, often including the KX161-3 model as well.
– USB thumb drive: The manual is available on a USB drive, which can be purchased.
– CD: Some sellers offer the manual on CD upon request.

2. Content:
The service manual typically includes:

– Comprehensive workshop information
– Detailed service and repair instructions
– Specifications and technical data
– Troubleshooting guides
– Wiring diagrams and electrical information

3. Page Count:
One version of the manual is reported to contain 994 pages in PDF format

4. Related Manuals:
– An operator’s manual is also available, which is different from the service manual and focuses on operation and basic maintenance.
– Some versions include information for both the KX121-3 and KX161-3 models.

5. Sections:
The manual typically covers various sections, including:

– Sales Engineering Section
– Service Engineering Section
– Machine Specifications
– Hydraulic Systems
– Electrical Systems
– Troubleshooting and Diagnostics.

6. Importance:
Having access to the service manual is crucial for proper maintenance, troubleshooting, and repairs of the Kubota KX121-3 excavator. It provides detailed information that goes beyond what’s available in the operator’s manual.

When obtaining a service manual, ensure it’s the correct version for your specific model and year of the KX121-3, as there may be variations in specifications and components across different production runs.

Kubota KX121-3 Parts Manual

1. Availability:
The Kubota Excavator KX121-3 Parts Manual is available for purchase. It’s listed as being in stock, indicating that it’s readily accessible for those who need it.

2. Format:
While not explicitly stated in the search results, parts manuals are typically available in digital formats (such as PDF) or as physical copies.

3. Content:
Parts manuals generally include:
– Detailed diagrams of all components
– Part numbers for each component
– Assembly and disassembly instructions
– Specifications for parts

4. Related Resources:
– There’s also an operator’s manual available for the Kubota KX121-3 and KX161-3 models. While this is different from a parts manual, it can be a useful complementary resource.
– Messicks offers a Kubota Parts Catalog Lookup for the KX121-3 (SN:20000-29999), which allows users to find specific parts using detailed diagrams.

5. Importance:
A parts manual is crucial for:
– Identifying the correct replacement parts
– Understanding the assembly of various components
– Assisting in maintenance and repair tasks

6. Additional Information:
While not directly related to the parts manual, it’s worth noting that Garton Tractor, Inc. provides access to the Kubota KX121-3 Operator’s Manual as a downloadable PDF

For those needing to order parts or perform maintenance on a Kubota KX121-3 excavator, obtaining the official parts manual would be highly beneficial. It provides the most accurate and detailed information specific to this model.

Kubota KX121-3 Lifting Capacity

The KX121-3 has different lifting capacities depending on the lift point radius and height. Key figures include:

1. Over the front, blade down:

– At 8 ft radius:
– Ground level: 4.16 x 1000 lbs (1,887 kg)
– 8 ft height: 3.96 x 1000 lbs (1,796 kg)

– At 12 ft radius:
– Ground level: 2.39 x 1000 lbs (1,084 kg)
– 8 ft height: 2.27 x 1000 lbs (1,029 kg)

2. Over the side:

– At 8 ft radius:
– Ground level: 2.51 x 1000 lbs (1,138 kg)
– 8 ft height: 2.57 x 1000 lbs (1,166 kg)

– At 12 ft radius:
– Ground level: 1.44 x 1000 lbs (653 kg)
– 8 ft height: 1.47 x 1000 lbs (667 kg)

These capacities are given in 1000 lb units, so the actual capacity is 1000 times the listed number. The lifting capacity is generally higher when lifting over the front with the blade down compared to lifting over the side.

It’s important to note that these figures can vary based on factors such as the specific configuration of the machine, attachments being used, and operating conditions. Always refer to the official operator’s manual for the most accurate and up-to-date lifting capacity information.

Kubota KX121-3 Hydraulic Pump

The Kubota KX121-3 hydraulic pump is a critical component for the excavator’s operation. Here’s a summary of the available options and pricing:

1. OEM Part Numbers:
– RD118-61115
– B0610-42003
– PSVL-42CGKX121-3SS

2. Price Range:
– Prices vary significantly, from around $966 to $4,500
– Most reputable suppliers price the pump between $2,500 and $3,800

3. Top Options:
– Hydraulic America offers a new pump for $3,717 with free shipping and a one-year unlimited-hour warranty.
– FridayParts.com has a pump (RD101-61110/RD101-61112) for $2,499.99 with free shipping.
– Pro Couplings sells the pump for $3,241.07 with free shipping.

4. Features:
– These pumps are designed for smooth and consistent hydraulic power
– They’re typically easy to install and should provide immediate performance improvement

5. Warranty and Shipping:
– Many suppliers offer a one-year warranty
– Free shipping is common within the continental US and Canada

6. Considerations:
– Ensure compatibility with your specific KX121-3 model
– Check if the pump comes with necessary components like the coupling assembly

Kubota KX121-3 Attachments

1. Quick Attach Systems:
– Haugen Attachments Kubota Tach-All Quick Attach: $1,995.00
– Kubota KX121-3 Quick Attach Mounting Bracket: $450.00

2. Buckets:
– 12″ Quick Attach Bucket: $1,229.00
– 16″ Quick Attach Bucket: $1,267.00
– 18″ Quick Attach Bucket: $1,299.00
– 24″ Quick Attach Bucket: $1,398.00
– Digging Bucket – 24″ / 600mm
– Ditch Cleaning Bucket – 36″ / 915mm
– Tilt Grading Bucket – 36″ / 915mm
– Micro Trenching Buckets – various sizes

3. Other Attachments:
– Ripper: $1,599.99
– Land Rake – 48″ / 1200mm
– Grading Beam / Ditching Beam – 48″ / 1200mm or 60″ / 1500mm

Most of these attachments come with free shipping. Many are designed to be compatible with Kubota’s Quick Attach system for easy switching between tools.

When selecting attachments, consider the specific tasks you’ll be performing and choose the appropriate size and type. The Quick Attach system seems to be a popular option for the KX121-3, allowing for versatility in attachment use.

Trenching:

There are several specialized attachments available for trenching with the Kubota KX121-3:

1. Micro Trenching Buckets:
– 27″/700mm depth, 4″ width: $910.00
– 27″/700mm depth, 5″ width: $960.00
– 15″/380mm depth, 5″ width: $810.00

These micro trenching buckets are designed specifically for the KX121-3 with a Quick Attach system. They’re offered by Rhinox Group US with free shipping.

2. Standard Trenching Buckets:
– 12″ Trenching Bucket: $1,242.18 (eBay)
– 12″ Quick Attach Bucket: $1,229.00 (USA Attachments)
– 16″ Quick Attach Bucket: $1,267.00 (USA Attachments)
– 18″ Quick Attach Bucket: $1,299.00 (USA Attachments)

3. Other Relevant Attachments:
– Ditch Cleaning Bucket – 36″ / 915mm
– Tilt Grading Bucket – 36″ / 915mm
– Grading Beam / Ditching Beam – available in 48″ / 1200mm or 60″ / 1500mm

These specialized attachments are designed to enhance the KX121-3’s trenching capabilities, offering various widths and depths to suit different trenching needs. The micro trenching buckets, in particular, are ideal for precise, narrow trenches often required for utility work.

When selecting a trenching attachment, consider the width and depth of the trench you need to create, as well as compatibility with your machine’s quick attach system if applicable.

Kubota KX121-3 Engine Oil Capacity

1. Engine oil capacity: 9.2 liters (2.43 gallons)

2. Recommended oil:
– Kubota Genuine OEM SAE 10W-30 Engine Oil (part #70000-10200)
– Kubota SAE 15W-40 Engine Oil is also available

3. Oil pricing:
– 1 gallon of Kubota 10W-30: $42.99 – $48.87
– 2.5 gallons of Kubota 15W-40: $62.81 – $105.87
– 6-pack of 1-quart bottles (10W-30): $36.99

4. Oil change information:
It’s generally recommended to change the oil and filter every 500 hours or annually, whichever comes first, for most Kubota excavators.

5. Oil filter:
The oil filter part number is HH151-32430, priced at $12.59.