The COGENG RE51774 Water Temperature Sensor is a high-precision, direct OEM replacement sensor specifically designed for a wide range of John Deere tractors and equipment, including the 2355, 2750, 2755, and 2955 models. This sensor is critical for monitoring engine coolant temperature, which directly affects fuel injection timing, cold start performance, and engine protection.
This sensor uses a Negative Temperature Coefficient (NTC) thermistor—as coolant temperature increases, electrical resistance decreases, sending a variable signal to the dashboard gauge or ECU. Accurate coolant temperature readings are essential for:
Fuel Injection Timing: Adjusting timing for optimal combustion
Cold Start Assistance: Enabling glow plugs in cold weather
Dashboard Gauge: Displaying accurate temperature to the operator
Manufactured under ISO9001 certified processes, the COGENG RE51774 features a brass sensor body with a sealed plastic connector housing for durability in demanding conditions .
Why Choose COGENG RE51774?
Direct OEM Replacement: Replaces John Deere RE51774, AL24527, RE515494
High Accuracy: Precise temperature measurement for optimal engine performance
In Stock: Ready for immediate shipment
| Component | Quantity | Description |
|---|---|---|
| Water Temperature Sensor | 1 | Complete sensor assembly with terminal/connector |
| Rubber O-ring / Sealing Washer | 1 | Pre-installed on threaded base |
| Protective Plastic Cap | 1 | For shipping protection only |
Note: No additional hardware or sealant is required for installation.
This sensor is specifically designed for the following John Deere tractors:
| Model | Engine | Typical Year Range | Application |
|---|---|---|---|
| John Deere 2355 | John Deere 4-cylinder diesel | 1986–1992 | Utility tractor |
| John Deere 2750 | John Deere 4-cylinder diesel | 1984–1989 | Utility tractor |
| John Deere 2755 | John Deere 4-cylinder diesel | 1986–1992 | Utility tractor |
| John Deere 2955 | John Deere 6-cylinder diesel | 1986–1992 | Utility tractor |
Additional compatible models (verify before purchase):
| Model | Compatibility |
|---|---|
| John Deere 2350 | ✅ Likely compatible |
| John Deere 2455 | ✅ Likely compatible |
| John Deere 2555 | ✅ Likely compatible |
| John Deere 2655 | ✅ Likely compatible |
| John Deere 2855 | ✅ Likely compatible |
| John Deere 3050 | ✅ Likely compatible |
| John Deere 3150 | ✅ Likely compatible |
| John Deere 3350 | ✅ Likely compatible |
| John Deere 3650 | ✅ Likely compatible |
⚠️ Important: The RE51774 is a widely used temperature sensor across John Deere's 50 and 55 series utility tractors. It is used with John Deere 4-cylinder and 6-cylinder diesel engines.
| Model | Engine | Displacement | Configuration |
|---|---|---|---|
| 2355 | John Deere 4-cylinder | 3.9L (239 cu in) | Naturally aspirated / Turbo |
| 2750 | John Deere 4-cylinder | 3.9L (239 cu in) | Naturally aspirated |
| 2755 | John Deere 4-cylinder | 3.9L (239 cu in) | Naturally aspirated / Turbo |
| 2955 | John Deere 6-cylinder | 5.9L (359 cu in) | Naturally aspirated / Turbo |
Normal Coolant Temperature Ranges:
| Condition | Temperature | Gauge Reading | Action |
|---|---|---|---|
| Cold Start | 0-30°C (32-86°F) | Cold | Glow plugs active |
| Warmup | 30-70°C (86-158°F) | Rising | Normal |
| Normal Operating | 75-95°C (167-203°F) | Mid-range | Normal |
| High Temperature Warning | 100-105°C (212-221°F) | Red zone | Check cooling system |
| Overheat | >105°C (>221°F) | Maximum | Shut down engine |
| Brand | Part Number | Notes |
|---|---|---|
| COGENG | RE51774 | Direct replacement |
| John Deere (OEM) | RE51774 | Original equipment |
| John Deere (alternate) | RE25614 | Similar (verify) |
| Aftermarket | AR57310 | Similar (verify) |
| Aftermarket | 6066C | Common cross-reference |
Note: Always match your original sensor part number. RE51774 is the John Deere OEM number for this sensor.
✅ Direct OEM replacement for:
John Deere part number: RE51774
✅ Designed For:
John Deere 2355 tractor
John Deere 2750 tractor
John Deere 2755 tractor
John Deere 2955 tractor
✅ Engine Compatibility:
John Deere 4-cylinder diesel (3.9L) – 2355, 2750, 2755
John Deere 6-cylinder diesel (5.9L) – 2955
✅ Electrical Specifications:
Connector: Single spade terminal (6.3mm)
Output: Variable resistance (to dashboard gauge)
Operating Voltage: 12V (gauge circuit)
✅ Mechanical Specifications:
Thread Size: 1/8-27 NPT
Hex Size: 17mm, 19mm, or 22mm
Sealing: Rubber O-ring or copper washer
⚠️ Before purchasing, please verify:
| Check Item | Why It's Important |
|---|---|
| Tractor Model | 2355, 2750, 2755, or 2955 |
| Engine Type | 4-cylinder or 6-cylinder diesel |
| Old Part Number | RE51774 or confirm |
| Connector Type | Single spade terminal |
| Thread Size | 1/8-27 NPT |
❌ NOT Compatible With:
John Deere 30 Series (check connector type)
John Deere 40 Series (check connector type)
John Deere 10 Series (older – different)
Non-John Deere equipment (different gauge calibration)
Tools Required:
| Tool | Purpose |
|---|---|
| 17mm, 19mm, or 22mm wrench / socket | Remove and install sensor |
| Torque wrench (recommended) | Achieve 15–25 Nm spec |
| Clean rag | Wipe coolant spills |
| Flashlight | Locate sensor |
| Coolant (recommended) | Top up if needed |
| Small pliers | Remove wire if stuck |
Installation Tips:
⚠️ Engine must be cool – hot coolant can cause severe burns.
🧹 Clean mounting surface – debris can prevent proper sealing.
💧 Apply coolant to O-ring – helps seating and prevents twisting.
🔧 Do NOT overtighten – brass housing can crack at >30 Nm.
🚫 Never use PTFE tape – can clog coolant passages.
🔌 Ensure wire connection is secure – loose wire causes intermittent gauge readings.
🔍 Check for leaks after engine reaches operating temperature.
Q1: What are the symptoms of a failing water temperature sensor on a John Deere 2755/2955?
A: Common symptoms include:
Temperature gauge reads 0°C or stays at cold (even when engine is hot).
Temperature gauge pegs at maximum (overheating warning).
Hard starting in cold weather (no cold-start assist).
Poor fuel economy.
Engine overheating without warning.
Erratic gauge readings (fluctuates).
Q2: Is this a genuine John Deere OEM part?
A: No. COGENG is an aftermarket manufacturer (ISO9001) . Our parts are built to OEM specifications, offering the same fit and function at a reduced cost.
Q3: Will this sensor fit my John Deere 2355?
A: Yes – the 2355 is one of the primary compatible models.
Q4: Will this sensor fit my John Deere 2750?
A: Yes – the 2750 is one of the primary compatible models.
Q5: Will this sensor fit my John Deere 2755?
A: Yes – the 2755 is one of the primary compatible models.
Q6: Will this sensor fit my John Deere 2955?
A: Yes – the 2955 is one of the primary compatible models.
Q7: Will this sensor fit my John Deere 2555?
A: Yes – the 2555 is also compatible with the RE51774 sensor.
Q8: Will this sensor fit my John Deere 3050?
A: Yes – the 3050 is likely compatible, but verify your old part number.
Q9: What is the correct torque for this sensor?
A: 15–25 Nm (11–18 ft-lbs) . Do not overtighten – the brass housing can crack.
Q10: Can I install this sensor myself?
A: Yes, with basic mechanical skills (15–20 minutes). If unsure, professional installation is recommended.
Q11: Is this sensor in stock for immediate shipping?
A: Yes – COGENG maintains stock of 500+ units. Orders ship within 24–48 hours.
Q12: How long does shipping take?
A:
Express (DHL/FedEx/UPS/TNT): 3–7 business days worldwide.
Air freight: 7–12 days.
Sea freight: 20–40 days.
Q13: How do I place a trial order?
A: Contact your COGENG distributor. MOQ is 1 piece.
Q14: What is the warranty?
A: COGENG provides a 6-month warranty against manufacturing defects.
To ensure we ship the correct sensor, please provide:
Tractor Model: 2355 / 2750 / 2755 / 2955
Engine Type: 4-cylinder or 6-cylinder diesel
Old Part Number: RE51774 (or confirm)
Photo of Old Sensor: (recommended – helps identify connector and thread type)
✅ In Stock – Ready to Ship.
✅ MOQ 1 piece accepted for trial orders.
*shipping Details Return Sales*
Sales price:
Please contact COGENG sales customer service for specific prices.
Shipping method:
The specific arrangement will be based on the cargo situation.
Estimated delivery time:
It is based on the shipping time of the logistics company, and the arrival time shown shall prevail.
Contact details are at the bottom.
MerchantReturnPolicy:
The products shipped are not returnable or exchangeable.
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