RPM Speed Sensor Compatible with XCMG Excavator

1. Product Overview & Wholesale Price Range

The RPM Speed Sensor is a magnetic pickup-type sensor that monitors engine crankshaft rotational speed and piston position signals, feeding real-time data to the engine ECU for fuel injection timing control for XCMG excavator.

• Factory Wholesale Price: $14 – $60 USD (Direct manufacturer pricing — Save up to 50% vs regional dealer markups)
• Sensor Type: Magnetic Pickup (MPU) / Variable Reluctance Type
• MPN: RPM Speed Sensor
• MOQ & Bulk Discount: 1 Unit (Tiered wholesale discounts available for repair shop & distributor batch orders)
• Lead Time: 1–3 business days (Large factory stock ready for immediate worldwide dispatch)
• Warranty: 12 Months full replacement warranty with signal output test guarantee

2. Application Worksite Checklist

Engineered with heat-resistant magnetic coil and threaded steel probe to withstand harsh engine compartment conditions:

• Excavator Engine Control: Provides accurate crankshaft RPM and TDC signals to engine ECU for precise fuel injection timing.
• Heavy Earthmoving & Quarry Operations: Sealed brass housing resists oil, dust and vibration under continuous high-RPM engine loading.
• Long-Hour Mining & Loading Work: Stable signal output prevents engine stalling, misfiring and ECU fault codes during multi-shift operation.
• Cold Start & Idle Control: Reliable magnetic pickup ensures consistent RPM reading from cold cranking to full operating temperature.

3. RPM Speed Sensor Troubleshooting & Diagnostic Guide

If your XCMG excavator is exhibiting sensor-related failure, consult the diagnostic guide below:

• Fault 1: Engine Crank No Start / No RPM Reading on Gauge
  Root Cause: Failed or intermittent RPM speed sensor — ECU receives no crankshaft position signal and cannot trigger fuel injection.
  Solution: Replace with a new RPM speed sensor and inspect the sensor gap to the flywheel ring gear.
• Fault 2: Intermittent RPM Fluctuation & Engine Stalling
  Root Cause: Cracked internal coil winding or loose connector causing signal drop-out under engine vibration.
  Solution: Install a new RPM speed sensor and clean or replace the wiring harness connector pins.
• Fault 3: ECU Fault Code P0335 / P0340
  Root Cause: Open circuit, short circuit or incorrect air gap between sensor tip and trigger gear.
  Solution: Replace RPM speed sensor and verify 0.5–1.5mm installation gap; clear DTC with diagnostic scanner.
• Fault 4: Engine Misfire & Poor Acceleration
  Root Cause: Weak or erratic crankshaft position signal causing incorrect fuel injection timing.
  Solution: Replace the speed sensor before pursuing expensive fuel system repairs.
• Fault 5: Oil Contamination on Sensor Probe
  Root Cause: Oil seal leakage or blow-by deposits on the magnetic tip, weakening signal strength.
  Solution: Clean the probe surface or replace with a new RPM speed sensor; inspect rear main seal.

4. Hot Machinery Replacement Parts Recommendation

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5. Frequently Asked Questions & Technical Support

Q1: How do I verify if this RPM speed sensor fits my XCMG excavator?
A: Check your original sensor shape and connector, confirm your machine is XCMG excavator. Send machine serial number to us for quick fitment check.

Q2: What type of sensor is it and what is its function?
A: This is a magnetic pickup (variable reluctance) RPM speed sensor. It detects flywheel gear teeth to measure engine RPM and crankshaft position, sending signals to the engine ECU for fuel injection timing control.

Q3: What should the installation gap be between the sensor and flywheel?
A: The recommended air gap between the sensor tip and the flywheel ring gear is 0.5–1.5mm. Incorrect gap causes weak signal, no-start or intermittent stalling. Use a feeler gauge during installation.

Q4: Does this RPM speed sensor come with a wiring pigtail and connector?
A: Yes, each sensor ships with the standard pigtail connector and sealed harness end matching the original machine plug, ready for direct plug-and-play installation.