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Cat Pump Pressure Sensor 434-3436 for E312 E320 E330 E336 E390 Excavator
Brand Name:
MSGB
Model Number:
434-3436
Place of Origin:
China
Minimum Order Quantity:
1
Price:
Negotiable
Supply Ability:
1000pcs/month
Product Details
| Application: | Used In Excavator Electrical Systems For Power Distribution And Control | Deliery: | DHL Fedex EMS |
|---|---|---|---|
| Part Number: | 434-3436 | Oem: | Avaliable |
| Specifiions: | 24V/30A B95-29 | Function: | Electrical System Components For Excavators |
| Delivery Terms: | Express,Sea,Air | Connectortype: | Standard Plug Connectors |
| Condition: | 100% Brand-new | Service: | Online Support |
| Highlight |
Cat Pump pressure sensor for excavators,Excavator pressure sensor 434-3436,E312 E320 E330 pressure sensor |
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Product Description
🌟 Product Features
- Direct OEM fit: Matches original thread, port depth, and 3-pin connector — bolt-in replacement with no harness modification.
- Stainless steel diaphragm: Welded stainless sensing diaphragm resists corrosion, fatigue, and pressure spikes from pump pulsation.
- Linear 0.5–4.5V output: Ratiometric signal gives the ECM an accurate, drift-free pressure reading across the full range.
- Stable 5V supply tolerance: Built-in regulation prevents reading errors from wiring voltage drop or alternator noise.
- High vibration resistance: Solid-state sensing element with no moving parts survives continuous excavator frame vibration.
- IP67/IP69K sealed housing: Epoxy-potted electronics and multi-lip seals keep out water, mud, and high-pressure washdown.
- Wide temperature range: Calibrated performance from -40 °C cold starts to +125 °C engine-bay heat.
- Fast response time: Millisecond-level response lets the ECM react instantly to load changes for smooth compound movements.
- Cross-reference support: Match by OEM number, serial number, or symptom (low-power mode, weak hydraulics, fault code).
🔍 Technology & Principle
The pump pressure sensor is the ECM's "eyes" on hydraulic system load:
- Pressure pickup: Hydraulic oil from the main pump delivery line acts on the welded stainless diaphragm inside the sensor body.
- Strain conversion: Diaphragm deflection changes the resistance of a bonded strain gauge / piezoresistive bridge.
- Signal conditioning: An onboard ASIC amplifies, temperature-compensates, and linearizes the tiny bridge signal.
- Voltage output: A clean 0.5–4.5 V ratiometric signal is sent to the ECM — 0.5V at zero pressure, 4.5V at full scale.
- ECM processing: The ECM compares actual pump pressure against engine speed, joystick demand, and other sensors to compute optimal pump displacement and engine torque.
- System control: Results drive pump regulator solenoids for horsepower matching, auto-idle, swing priority, travel shift, and derate/limp-mode protection — plus trigger diagnostic codes if readings go out of range.
🏗️ Applications
- Main pump pressure monitoring: Restoring correct power matching and eliminating unexplained power loss on E320/E330/E336.
- Fault code diagnosis: Resolving persistent pump-pressure-related diagnostic codes and warning messages.
- Limp/low-power mode: Fixing machines stuck in derate mode due to implausible or missing pressure signals.
- Fuel economy recovery: Correcting erroneous rich/high-RPM mapping caused by false low-pressure readings.
- Hydraulic sluggishness: Restoring smooth combined boom-arm-swing movements in loading and trenching cycles.
- Fleet preventive maintenance: Replacing aging sensors during scheduled hydraulic service on E312–E390 fleets.
- Reman & repair shops: Drop-in replacement for rebuilding pump regulators and main control systems.
⚙️ Manufacturing Process
- Material selection: 17-4PH / 316L stainless diaphragm and housing — spectrometry and material-cert verified.
- Diaphragm forming & welding: Precision-formed sensing diaphragm laser/TIG welded to the body, leak-tested at 1.5× full scale.
- Strain gauge bonding: Semiconductor/piezo-resistive bridge applied and cured under controlled temperature for stable zero point.
- Signal chip calibration: Individual temperature and pressure point calibration across the full range; coefficients stored in the ASIC.
- CNC machining: Threads and sealing surfaces machined to tight tolerances for leak-free installation.
- Cleaning & assembly: Ultrasonic cleaning of all wetted parts; assembly in dust-controlled environment.
- Sealing & potting: Electronics potted in epoxy; multi-lip seals installed to IP67/IP69K standard.
- 100% testing: Zero/span accuracy test, hysteresis & repeatability check, overpressure burst test, leakage test, insulation resistance, thermal cycling, and vibration test before dispatch.
🤝 Company Services
- Global shipping: Air freight (3–5 days) or sea freight (15–25 days); anti-static individual packaging in export cartons.
- 12-month warranty: Covers signal drift, zero offset failure, leakage, and connector defects under normal use.
- Technical support: 24/7 remote assistance for fault-code diagnosis, wiring checks, and pressure verification with a gauge.
- Part-number cross-reference: Free lookup by OEM number, serial number, or symptom description.
- Bulk & fleet pricing: Special rates for dealers, rental fleets, repair shops, and large orders.
- Full sensor range supply: Pump pressure sensors, rail/supply pressure sensors, temperature sensors, speed sensors, switches, and harnesses for Cat same-platform machines.
- Core exchange & inspection: Returns accepted for failure analysis and lot traceability.
❓ FAQ
Q: Will sensor 434-3436 fit my Cat E336?
A: It is designed for Cat E312–E390 same-platform models. Provide your serial number and original part number so we can confirm exact fitment, thread, and connector type.
A: It is designed for Cat E312–E390 same-platform models. Provide your serial number and original part number so we can confirm exact fitment, thread, and connector type.
Q: What symptoms indicate a failed pump pressure sensor?
A: Common signs include unexplained power loss, machine stuck in low-power/derate mode, sluggish or jerky combined movements, poor fuel economy, erratic gauge readings, and pump-pressure-related diagnostic codes.
A: Common signs include unexplained power loss, machine stuck in low-power/derate mode, sluggish or jerky combined movements, poor fuel economy, erratic gauge readings, and pump-pressure-related diagnostic codes.
Q: Can a bad sensor cause low power without any mechanical fault?
A: Yes. If the ECM receives an implausible or absent pressure signal, it will derate the engine and limit pump displacement as a protective measure — even when the pump itself is healthy.
A: Yes. If the ECM receives an implausible or absent pressure signal, it will derate the engine and limit pump displacement as a protective measure — even when the pump itself is healthy.
Q: Do I need to recalibrate after replacing the sensor?
A: Usually no — the sensor is pre-calibrated and plug-and-play. Some models may require clearing stored fault codes with a service tool; a few may need a pressure calibration routine. We can advise based on your serial number.
A: Usually no — the sensor is pre-calibrated and plug-and-play. Some models may require clearing stored fault codes with a service tool; a few may need a pressure calibration routine. We can advise based on your serial number.
Q: How do I verify the sensor is working?
A: With the key on and engine off, measure supply voltage (~5V) at the connector and signal voltage (should read near 0.5V at zero pressure). Then start the engine and compare the rising signal against a mechanical gauge on the same port.
A: With the key on and engine off, measure supply voltage (~5V) at the connector and signal voltage (should read near 0.5V at zero pressure). Then start the engine and compare the rising signal against a mechanical gauge on the same port.
Q: Is this a genuine Cat part?
A: This is an aftermarket/OEM-grade replacement part manufactured to match Cat specifications. It is not a genuine Cat-branded part unless explicitly stated. Cross-reference numbers are for identification only.
Product Highlights
Direct OEM-fit Cat pump pressure sensor 434-3436 with stainless steel diaphragm, IP67/IP69K sealing, and 0.5-4.5V ratiometric output. Resists corrosion, vibration, and temperature extremes (-40°C to +125°C) for reliable hydraulic system monitoring in E312-E390 excavators.
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