COGENG 320/04038 320/04046 Oil Pressure Sensor JCB 3CX 4CX

Product Specification Sheet

PRODUCT OVERVIEW

The COGENG JCB Oil Pressure Sensor (Part Nos. 320/04038 & 320/04046) is a high-precision direct OEM replacement designed specifically for JCB 3CX and 4CX backhoe loaders – two of the most popular and widely used construction machines worldwide.

This critical engine component continuously monitors engine oil pressure and transmits real-time signals to the dashboard gauge or ECU (depending on model year), ensuring proper engine lubrication and protecting your valuable equipment from costly damage caused by low oil pressure.

Designed for the demanding environment of construction sites, farms, and demolition projects – including constant vibration, extreme temperature fluctuations (-40°C to +125°C), and exposure to oil, dust, and debris – this sensor features a rugged iron housing and premium rubber seals that deliver leak-proof performance and exceptional durability.

Why Choose COGENG 320/04038 & 320/04046?

Feature	Benefit
✅ Direct OEM Replacement	No modifications, no adapters – bolt it on and go
✅ Two Part Numbers Available	320/04038 and 320/04046 cover different JCB variants
✅ High Accuracy	Reliable oil pressure readings for dashboard and ECU
✅ Durable Iron Construction	Withstands impact, corrosion, and vibration
✅ Leak-Proof Design	Premium rubber O-ring pre-installed
✅ In Stock	Ready to ship immediately
✅ Affordable	OEM quality at aftermarket prices
✅ ISO9001 Certified	Consistent quality you can trust

Decompose pictures

Parts List

COMPATIBLE JCB MODELS

This oil pressure sensor is specifically designed for the following JCB backhoe loader models:

Additional compatible JCB machines (verify before purchase):

Important: Always confirm your original part number before ordering. The 3CX and 4CX have been in production for decades – the correct sensor depends on your machine's year and electrical system.

Compatibility Notes

✅ Direct OEM replacement for:

• JCB part number: 320/04038

• JCB part number: 320/04046

✅ Designed for:

• JCB 3CX backhoe loader (all variants)

• JCB 4CX backhoe loader (all variants)

✅ Engine compatibility (typical):

• JCB Dieselmax 444 (4.4L, 4-cylinder turbo)

• Perkins 1004-4 (4.0L, 4-cylinder)

• Perkins 1104-44 (4.4L)

• Perkins 1000 series

✅ Electrical specifications (by part number):

⚠️ Before purchasing, please verify:

❌ NOT compatible with:

• JCB 3CX with Perkins engines requiring different thread size (rare – verify)

• JCB machines with Isuzu or Cummins engines

• JCB Telehandlers (different engine family)

• Non-JCB machines without proper thread adapter

Part Number Cross-Reference Guide

Tools Required:

Installation Tips:

• ⚠️ Engine must be cool – hot oil can cause severe burns

• 🧹 Clean mounting surface – debris can prevent proper sealing

• 💧 Apply clean engine oil to O-ring before installation

• 🔧 Do NOT overtighten – iron housing can crack at >30 Nm

• 🚫 Never use PTFE tape – can shred and clog oil passages

• ✅ 320/04038: Single spade connector – ensure tight fit

• ✅ 320/04046: Listen for "click" when connecting 2-pin
• 🔍 After installation, idle engine for 2 minutes and inspect for leaks

*Shipping Details Delivery Return*
Sales Price:
The displayed price is for reference only. Please contact COGENG sales support for the exact price.
Shipping Method:
Sea, land, or air transport; the specific method is determined based on the nature of the shipment.
Estimated Delivery Time:
Based on the dispatch time from the logistics carrier; the displayed arrival time serves as the reference.
Contact information is provided at the bottom of the page.
Merchant Return Policy:
Products shipped are not eligible for return or exchange.

Frequently Asked Questions 

Q1: What is the difference between 320/04038 and 320/04046?
A: These are two different sensors for different JCB 3CX/4CX variants:

Always match your old sensor part number.

Q2: What are the symptoms of a failing oil pressure sensor on a JCB 3CX or 4CX?
A: Common signs include:

• Oil pressure warning light stays on or flashes (even when oil is full)

• Oil pressure gauge reads zero or maximum constantly

• Intermittent warning light, especially when engine is hot

• Engine knocking or ticking (low oil pressure not detected)

• On newer machines (320/04046): error codes or Check Engine light

• Machine may go into derate / limp mode (electronic models)

Q3: Is this a genuine JCB OEM part?
A: No. This is a COGENG aftermarket replacement manufactured to meet or exceed OEM specifications. It is a direct replacement for JCB part numbers 320/04038 and 320/04046.

Q4: Will this sensor fit my JCB 3CX with Perkins engine?
A: Yes – most JCB 3CX and 4CX machines with Perkins 1004 series or JCB Dieselmax engines are compatible. Verify your old part number for confirmation.

Q5: Will this sensor fit my JCB 4CX Super?
A: Yes – the 4CX Super typically uses 320/04046 (electronic version). Check your old sensor connector type.

Q6: How do I know which part number I need for my JCB?
A: Check your old sensor:

• Single spade terminal → 320/04038

• 2-pin connector → 320/04046

• If unsure, take a photo of your old sensor and send to your COGENG distributor.

Q7: Is this sensor in stock for immediate shipping?
A: Yes – COGENG maintains stock of 500+ units (both part numbers). Orders ship within 24–48 hours.

Q8: What is the warranty?
A: COGENG provides a 6-month warranty against manufacturing defects. Warranty does not cover damage from improper installation, physical impact, or environmental contamination.

Q9: 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

Q10: Do I need any special tools to install this sensor?
A: No. A standard 22mm or 24mm wrench is all you need. For 320/04046, a small screwdriver helps release the connector lock.

Q11: Can I install this sensor myself, or do I need a mechanic?
A: With basic mechanical skills, you can install it yourself in about 15–20 minutes. However, if you are uncomfortable working around the engine, professional installation is recommended.

Q12: What is the correct torque specification?
A: 15–20 Nm (11–15 ft-lbs). Do not exceed 25 Nm.

Q13: Do I need to use thread sealant or PTFE tape?
A: No – the rubber O-ring provides the seal. Never use PTFE tape – it can shred and clog oil passages.

Q14: Will this sensor work with my JCB's electronic display?
A: 320/04046 is designed for electronic displays/ECU. 320/04038 is for analog gauges. Choose the correct part number for your machine.

Q15: How do I place a trial order?
A: Contact your COGENG distributor directly. MOQ is 1 piece for trial orders – we welcome first-time buyers.

Q16: What is the pressure range of this sensor?
A: The sensor measures from 0–150 PSI (0–10 bar) , covering the full operating range of JCB 3CX/4CX engines (normal operating pressure is 30–80 PSI at operating RPM).

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