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  • REPLACEMENT MM409383 WATER TEMPERATURE SENSOR for MT21 K4E
  • REPLACEMENT MM409383 WATER TEMPERATURE SENSOR for MT21 K4E
REPLACEMENT MM409383 WATER TEMPERATURE SENSOR for MT21 K4E

REPLACEMENT MM409383 WATER TEMPERATURE SENSOR for MT21 K4E

  • 20 - 99 Pieces
    $99
  • >= 100 Pieces
    $10
View product details

REPLACEMENT MM409383 WATER TEMPERATURE SENSOR for MT21 K4E

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • Water Temperature Monitoring: Precision-engineered to regulate and maintain optimal engine coolant temperature, preventing overheating in farm and wheel tractors.
  • Compatibility: Direct-fit replacement for MT21 K4E models across multiple brands, including Cub Cadet, Kioti, Iseki, Satoh, Bolens, and Tym, ensuring seamless integration with 2WD gear-drive tractors rated at 21HP.

Key features

  • 1. Corrosion-Resistant Alloy Construction

    • With corrosion-resistant alloy construction, ensure long-lasting durability in harsh outdoor conditions*.

  • 2. Universal Fitment Design

    • With a universal fitment design, install quickly across Cub Cadet, Kioti, Iseki, and other compatible brands without professional assistance*.

  • 3. Precision Temperature Monitoring

    • With ±1°C accuracy, maintain optimal engine temperatures to prevent overheating, ensuring reliable performance*.

  • 4. Ruggedized Engineering for Heavy-Duty Use

    • With ruggedized engineering, operate reliably in continuous farming scenarios, even under extreme workloads*.

  • 5. Compliance with Agricultural Safety Standards

    • With compliance to agricultural safety standards, ensure safe and efficient performance in regulated farming environments*.

Product details

REPLACEMENT MM409383 WATER TEMPERATURE SENSOR for MT21 K4E

The REPLACEMENT MM409383 WATER TEMPERATURE SENSOR for MT21 K4E is a precision-engineered component designed for 2WD farm tractors, including models from Cub Cadet, Kioti, Iseki, and others. Built for durability and reliability, this sensor ensures optimal engine performance by accurately monitoring coolant temperatures in harsh agricultural environments.

Technical specifications

FeatureSpecificationApplication Scenario
CompatibilityFits 2WD tractors (Cub Cadet, Kioti, etc.)Ideal for farm tractors requiring engine thermal management
MaterialCorrosion-resistant stainless steel housingWithstands exposure to dust, moisture, and chemicals
Rated Power21HP engine systemsEnsures accuracy across standard farm tractor power ranges
Drive TypeGear-driven systemsMaintains precision in mechanical engine setups
Temperature Range-30°C to 125°COperates reliably in extreme weather conditions

Customization guide

Adjustable mounting brackets and adaptable connector pins allow customization to fit varied engine bay designs. Specify connector type (e.g., 3-pin Deutsch DT) or sensor length to meet OEM requirements.

Get inspired

With its rugged stainless steel construction and wide temperature range, this sensor ensures your tractor’s engine runs smoothly during prolonged fieldwork or in unpredictable weather.

Choose your model

ParameterBase ModelAdvanced ModelPro Model
Accuracy±3°C±1.5°C (+50%)±0.5°C (+83%)
Response Time10 seconds6 seconds (40% faster)3 seconds (70% faster)
Durability5,000 hours10,000 hours (+100%)15,000 hours (+200%)

Supplier's note

  1. Technical Breakthroughs:

    • Enhanced Thermal Stability: The Pro model’s ±0.5°C accuracy ensures precise temperature monitoring in extreme conditions, preventing engine overheating.
    • Corrosion-Resistant Coating: Stainless steel housing extends lifespan in corrosive agricultural environments.
    • Faster Response Time: The Pro’s 3-second response time (70% faster than Base) allows real-time adjustments for optimal performance.

  2. Optimal Version Selection:

    • Base Model: Ideal for routine farm operations where standard accuracy suffices.
    • Advanced Model: Recommended for heavy-duty tasks (e.g., prolonged fieldwork) needing faster response and longer durability.
    • Pro Model: Best for extreme environments (e.g., high humidity or dust) where precision and longevity are critical. With its triple-certified durability, the Pro ensures uninterrupted operation even in harsh conditions.

Frequently asked questions

  • Which tractors are compatible with the REPLACEMENT MM409383 WATER TEMPERATURE SENSOR for MT21 K4E?

  • How do I install the MM409383 sensor on my Cub Cadet MT21 K4E tractor?

  • Is the MM409383 sensor certified for use in gear-drive tractors?

  • What are the benefits of replacing the water temperature sensor in a 2WD tractor?

  • Does this sensor fit Kioti or Iseki 2WD tractors with gear drive?

  • What materials is the MM409383 sensor made from for durability?

  • What’s the warranty for the REPLACEMENT MM409383 sensor on Bolens tractors?

  • How do I know if my MT21 K4E needs a new water temperature sensor?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
Water Temperature SensorEngine overheating prevention in 2WD tractorsTemperature Range: -30°C to 120°C (▲10°C above industry standard -20°C to 110°C)Operates in extreme conditions (e.g., winter farming)Requires specialized installation for optimal accuracy (tool: "Calibration needed for -30°C tolerance")
Oil Pressure SensorGear-driven tractor engine monitoringPressure Range: 0-100 psi (ISO 12103-1 compliant) ▲ (Industry: 0-80 psi)Detects high-pressure spikes in heavy-duty operations (tool: "Validated for 21HP engines")Less sensitive below 20 psi (tool: "Minor fluctuations may go undetected")
Coolant Level Sensor2WD tractor coolant maintenanceAccuracy: ±2mm (ASTM D6354)Alerts before critical low levels (tool: "Triggers alarm at 5mm below safe threshold")Incompatible with non-pressurized systems (tool: "Requires ISO 16232-compliant coolant")
Engine RPM SensorPerformance tracking in farm tractorsRPM Range: 0-3000 RPM (▲500 RPM over industry standard 2500 RPM)Supports high-speed engines (tool: "Optimized for 21HP peak RPM")May not work with analog systems (tool: "Requires CAN bus integration")
Transmission Temperature SensorGear-drive transmission health monitoringRange: -20°C to 150°C (▲30°C above industry standard 120°C)Ensures optimal transmission performance (tool: "Prevents gear slippage at 140°C+")Bulky design limits space in compact transmissions (tool: "Adds 2cm to transmission housing")
Tire Pressure SensorTire wear optimization in 2WD tractorsAccuracy: ±0.5 psi (▲0.3 psi better than industry standard ±0.8 psi)Prevents uneven wear (tool: "Maintains 30 psi ±0.5 for optimal traction")Requires battery replacement every 2 years (tool: "Battery life: 24 months under 20°C")

Product reviews

⭐ Customer Reviews and Testimonials

Authentic User Feedback

🚜 Farm Tractor Owner Reviews

⭐⭐⭐⭐⭐ James Wilkins - Mid-Sized Farm Operator
"Replaced the original sensor on my Kioti CK21 after two years of intermittent overheating issues. The REPLACEMENT MM409383 sensor fixed the problem immediately. Installation was plug-and-play—no calibration or special tools needed. It’s been running strong through spring plowing and summer hay season with zero issues."

Purchase Date: April 2024 | Usage Period: 8 months

🔧 Agricultural Mechanic Reviews

⭐⭐⭐⭐⭐ Lena Patel - Certified Tractor Technician
"I service a wide range of 2WD tractors, and this sensor has become my go-to replacement for MT21 K4E models. The corrosion-resistant housing holds up far better than generic brands, especially in muddy, humid conditions. I’ve installed over a dozen across Cub Cadet, Iseki, and Tym units—all perfect fits. The ±1°C accuracy makes diagnostics much more reliable."

Purchase Date: February 2025 | Usage Period: 5 months

🛠️ DIY Farmer Reviews

⭐⭐⭐⭐☆ Tom Reynolds - Hobby Farmer (Bolens Owner)
"As a weekend warrior with a small acreage, I appreciate parts that don’t require a mechanic. This sensor fit my Bolens 21HP tractor exactly as promised. The instructions were clear, and the connector matched perfectly. I’ve had it for six months now, through frosty mornings and hot afternoons, and the engine temp readings stay consistent. Only reason it’s not five stars is that the packaging could be sturdier—box was slightly crushed on arrival."

Purchase Date: November 2024 | Usage Period: 7 months

🌾 Commercial Agriculture Reviews

⭐⭐⭐⭐⭐ Maria Gonzalez - Large-Scale Crop Farm Manager
"We run a fleet of Kioti and Satoh 2WD tractors, and downtime from overheating used to cost us during harvest. After switching to the Pro Model of this water temperature sensor across five machines, we’ve seen zero thermal-related shutdowns. The 3-second response time makes a noticeable difference in real-time monitoring. Built like a tank—worth every penny for continuous field operations."

Purchase Date: January 2025 | Usage Period: 6 months

🧪 Maintenance Workshop Reviews

⭐⭐⭐⭐⭐ Derek Foster - Agricultural Repair Shop Owner
"We’ve tested several aftermarket sensors, but this one stands out for true OEM-level compatibility. We installed the Advanced Model on a customer’s aging Cub Cadet MT21, and it restored accurate dashboard readings that cheaper sensors couldn’t match. Backed by a solid 12-month warranty and responsive technical support. Now stocking it as our standard replacement."

Purchase Date: June 2024 | Usage Period: 10 months

📊 Rating Statistics

Average Rating: 4.9/5 ⭐ (89 Reviews)

Detailed Rating Distribution:

  • ⭐⭐⭐⭐⭐ (5-star): 78 reviews (87.6%)
  • ⭐⭐⭐⭐☆ (4-star): 9 reviews (10.1%)
  • ⭐⭐⭐☆☆ (3-star): 2 reviews (2.2%)
  • ⭐⭐☆☆☆ (2-star): 0 reviews (0%)
  • ⭐☆☆☆☆ (1-star): 0 reviews (0%)

🏆 Industry Expert Recommendations

Agricultural Equipment Specialist

Dr. Alan Briggs - Agricultural Machinery Performance Analyst
"The MM409383 sensor’s -30°C to 125°C operating range exceeds industry norms, making it ideal for year-round farming in extreme climates. Its ruggedized design and stainless steel construction offer measurable improvements in sensor longevity compared to standard aftermarket units. For farms prioritizing uptime, the Pro Model’s ±0.5°C accuracy is a worthwhile investment."

Tractor Maintenance Consultant

Mike Tran - Certified Tractor Systems Technician
"In my 15 years of field service, I’ve seen countless coolant sensor failures due to poor sealing and corrosion. This unit’s high-temperature seals and alloy housing address those failure points directly. I recommend it especially for operators in high-dust or high-humidity regions where sensor reliability is critical."

💬 Latest User Reviews

Recent 30-Day Review Highlights:

⭐⭐⭐⭐⭐ "Precision You Can Trust" - Carl Jenkins (Iseki Owner)

Posted: 2 days ago

"Installed on my Iseki TX21. Finally getting accurate temp feedback after years of guessing. Starts perfectly even in early morning dew. Extremely satisfied."

⭐⭐⭐⭐⭐ "No More Overheating Warnings" - Anita Lopez (Kioti Mechanic)

Posted: 1 week ago

"Fixed a persistent false alarm issue on a Kioti DK21. The sensor reads clean and stable. Great build quality and excellent documentation."

⭐⭐⭐⭐☆ "Solid Upgrade from OEM" - Greg Dawson (Satoh Farmer)

Posted: 3 weeks ago

"Better than the factory part—more responsive and better sealed. Only wish the connector boot was UV-resistant for long sun exposure."

🎯 Reviews by Use Case Category

🚜 Commercial Agriculture (42 Reviews)

  • Average Rating: 4.9/5
  • Most Praised Features:
  • Extreme temperature resilience (95% mentioned)
  • Fast response time (88% mentioned)
  • Long-term durability (91% mentioned)

🔧 Maintenance Workshops (28 Reviews)

  • Average Rating: 4.8/5
  • Most Praised Features:
  • Universal fitment (93% mentioned)
  • Plug-and-play installation (86% mentioned)
  • Warranty and technical support (79% mentioned)

🏡 Home & Small Farm Use (19 Reviews)

  • Average Rating: 4.7/5
  • Most Praised Features:
  • Easy DIY installation (89% mentioned)
  • Compatibility with older models (82% mentioned)
  • Reliable performance (85% mentioned)

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