| Parameter | Details |
|---|---|
| Product Name | Oil Pressure Sensor |
| Part Number | 4332040 |
| Compatible Brands | Hitachi |
| Compatible Excavator Models | EX120-5, EX200-5 |
| Compatible Engine | 4HK1 |
| Material | Iron + Rubber |
| Packing | PP bag inside, carton box outside |
| Payment Terms | Western Union, L/C, T/T, MoneyGram, D/A, D/P |
| MOQ | Acceptable trial order |
| Shipping Mode | By air, by sea, by express (FedEx, UPS, DHL, TNT, etc.) |
| Place of Origin | Guangdong, China |
| Brand Name | COGENG |
| Certification | ISO9001 |
| Stock Status | ✅ In Stock |
| Supply Capacity | 500 PCS |
The COGENG 4332040 Oil Pressure Sensor is a high-precision direct OEM replacement for Hitachi EX120-5 and EX200-5 excavators powered by the 4HK1 engine. This critical component continuously monitors engine oil pressure and transmits real-time signals to the ECU, ensuring proper lubrication and protecting your engine from costly damage caused by low oil pressure.
Designed for the demanding environment of construction sites – vibration, temperature extremes, and exposure to oil and debris – this sensor features a durable iron housing and high-quality rubber seals that provide leak-proof performance and long service life. Every unit is manufactured under ISO9001 certified processes and undergoes rigorous testing for accuracy, sealing integrity, and response time.
Why choose COGENG 4332040?
✅ Direct fit – No modifications required
✅ High accuracy – ±2% pressure reading tolerance
✅ Durable construction – Iron body resists impact and corrosion
✅ Leak-proof design – Premium rubber O-ring included
✅ In stock – Ready to ship immediately
✅ Affordable – OEM quality at aftermarket prices
| Component Name | Quantity | Description |
|---|---|---|
| Oil Pressure Sensor | 1 | Complete assembly, ready to install |
| Rubber O-ring / Sealing Ring | 1 | Pre-installed, prevents oil leaks |
| Protective Cap | 1 | Plastic (shipping protection only) |
| Instruction Card | 1 | Basic installation notes |
Key Features (Exploded View):
Connector Pins – Gold-plated for corrosion resistance
Internal Piezoresistive Element – Converts pressure to voltage
Signal Conditioning Circuit – Ensures stable output
Iron Housing – Zinc-plated for rust protection
Integrated O-ring – Pre-installed, no additional sealant needed
Actual product images are available from your COGENG supplier.
This sensor is specifically designed for the following Hitachi excavator models:
| Model | Engine | Year Range (typical) |
|---|---|---|
| Hitachi EX120-5 | 4HK1 | 1998–2005 |
| Hitachi EX200-5 | 4HK1 | 1998–2005 |
Additional compatible models (verify before purchase):
| Model | Compatibility Note |
|---|---|
| Hitachi EX120-3 | ❌ Not compatible (different engine) |
| Hitachi EX120-6 | ⚠️ Check connector type – may differ |
| Hitachi EX200-3 | ❌ Not compatible (different engine) |
| Hitachi EX200-6 | ⚠️ Check connector type – may differ |
| Hitachi ZX120 | ❌ Different series |
| Hitachi ZX200 | ❌ Different series |
Important: Always confirm your engine is 4HK1 before ordering.
✅ Direct OEM replacement for:
Hitachi OEM part number: 4332040
Also replaces: 4432040,4432041, 4432042 (check connector style)
✅ Designed for:
Hitachi EX120-5 with 4HK1 engine
Hitachi EX200-5 with 4HK1 engine
12V and 24V electrical systems (auto-detecting)
✅ Specifications:
Pressure range: 0–150 PSI (0–10 bar)
Output signal: Analog (0.5V – 4.5V) or variable resistance
Thread size: 1/8-27 NPT (standard) – confirm with old sensor
⚠️ Before purchasing, please verify:
Your excavator model is EX120-5 or EX200-5
Your engine is 4HK1 (check engine data plate)
Your old sensor part number matches 4332040 or similar
Connector type (2-pin vs 3-pin) – photo recommended
❌ Not compatible with:
Hitachi EX120-3, EX200-3 (Isuzu 4BD1/6BD1 engines)
Hitachi EX120-6, EX200-6 (different electrical system)
Any non-Hitachi machine without 4HK1 engine
Marine or generator applications (different vibration environment)
Installation decomposition diagram
Tools required:
22mm or 24mm deep socket or wrench
Torque wrench (recommended: 15–20 Nm / 11–15 ft-lbs)
Clean rag
Optional: Thread sealant (not required – rubber O-ring provides seal)
Installation tips:
⚠️ Engine must be COOL – risk of burns from hot oil
Do NOT overtighten – iron housing can crack
Do not use PTFE tape – rubber O-ring is sufficient
After installation, idle engine for 2 minutes, check for leaks
If oil light stays on, check connector and pressure reading
| Parameter | Value |
|---|---|
| Sensor Type | Piezoresistive (solid-state, no moving parts) |
| Pressure Range | 0–150 PSI (0–10 bar) |
| Output Signal | Analog 0.5V – 4.5V (linear) |
| Operating Voltage | 5V DC regulated (or 12V/24V with internal regulator) |
| Accuracy | ±2% full scale |
| Response Time | <10 ms |
| Operating Temperature | -40°C to +125°C |
| Thread Size | 1/8-27 NPT (confirm with old sensor) |
| Hex Size | 22mm or 24mm |
| Housing Material | Zinc-plated iron |
| Seal Material | Nitrile rubber (NBR) – oil resistant |
| Connector Type | 2-pin or 3-pin Deutsch / Packard (matches Hitachi OEM) |
| Protection Class | IP67 (waterproof when mated) |
| ISO Standard | ISO9001:2015 |
| Country of Origin | China (Guangdong) |
| HS Code | 90262090 |
| Order Option | Details |
|---|---|
| Minimum Order Quantity (MOQ) | 1 piece (trial order accepted) |
| Stock Status | ✅ 500+ pieces in stock |
| Lead Time | Ships within 24–48 hours |
| Payment Methods | Western Union, L/C, T/T, MoneyGram, D/A, D/P |
| Shipping Methods | FedEx, UPS, DHL, TNT, air freight, sea freight |
How to Order:
Send inquiry with your excavator model (EX120-5 or EX200-5)
Confirm engine is 4HK1
Provide photo of old sensor connector (to verify pin count)
Place order – we will send invoice
Receive tracking number within 24 hours
Q1: How do I know if my oil pressure sensor is failing?
A: Common symptoms:
Oil pressure warning light stays on or flashes
Oil pressure gauge reads zero or maximum constantly
Intermittent warning light (especially when engine is hot)
Engine derates or goes into "limp mode"
No oil pressure reading on display
Q2: Is this a genuine Hitachi OEM part?
A: No. This is a COGENG aftermarket replacement manufactured to meet or exceed OEM specifications. It is a direct replacement for Hitachi part number 4332040.
Q3: Will this fit my EX120-5 with 4HK1 engine?
A: Yes – this sensor is specifically designed for that exact combination.
Q4: Is this sensor in stock?
A: Yes – COGENG maintains stock of 500+ units. Orders ship within 24–48 hours.
Q5: What is the warranty?
A: COGENG provides a 6-month warranty against manufacturing defects.
Q6: How long does shipping take?
A: By express (DHL/FedEx): 3–7 days worldwide. By air: 7–12 days. By sea: 20–40 days.
Q7: Do I need any adapters to install this sensor?
A: No – it is a direct fit. Thread size matches the Hitachi 4HK1 engine block.
Q8: Can I install this sensor myself?
A: Yes, with basic mechanical skills. The installation takes about 15–20 minutes.
Q9: What is the difference between a pressure sensor and a pressure switch?
A: A sensor (like this one) provides continuous pressure readings to the ECU. A switch simply turns on/off at a set pressure. This is a sensor.
Q10: How do I place a trial order?
A: Contact your COGENG distributor directly. MOQ is 1 piece for trial orders.
✅ Direct OEM replacement
✅ High accuracy, durable, leak-proof
✅ In stock – ships immediately
✅ Trial orders accepted
✅ 6-month warranty
Contact COGENG supplier today to place your order!
*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.
Contact COGENG
📞 Phone: +86-185-2913-1515 🌐 Instagram
📧 Email: hugo@cogeng.net 🌐 Facebook：Excavator Parts Selection and Replacement Community
💬 WhatsApp +86-185-2913-1515 Facebook: Excavator Wiring Harness
💬 WeChat: +86-185-7865-1106 Facebook: Excavator Wire Harness
🌐 Website: cogeng.net Facebook: Excavator SolenoidValve
