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Q1: What is the product identification and applicable scope of the 2475212/247-5212 throttle motor for E312c/E320c?
A1: This product is the 2475212 (247-5212 with hyphen) excavator throttle motor—an OEM-compatible core electronic control component exclusively engineered for Caterpillar E312c (12-ton class) and E320c (20-ton class) mid-size excavators:
- E312c: Matched with the Caterpillar 3046T 4-cylinder diesel engine (rated power: 70.1kW @ 1950rpm), used for small-scale earthmoving, municipal engineering, and residential construction (continuous light-to-medium load operation);
- E320c: Paired with the Caterpillar 3066 6-cylinder diesel engine (rated power: 103kW @ 2000rpm), deployed in infrastructure construction, foundation works, and small-scale quarrying (continuous medium-to-heavy load operation).
As a critical throttle control part, it replaces faulty or worn-out OEM throttle motors, ensuring precise engine speed regulation for E312c/E320c. It complies with Caterpillar’s original electrical and mechanical specifications, suitable for routine maintenance, post-fault replacement (e.g., motor jamming, signal failure, speed regulation inaccuracy), and fleet electronic control system upgrades.
Q2: What core functions does the 2475212/247-5212 throttle motor perform for E312c/E320c?
A2: The throttle motor acts as the executive component of the excavator’s engine speed control system, delivering Caterpillar-specific speed regulation functions with seamless integration with the machine’s ECM:
Core Functions (Both Models)
- Precision engine speed adjustment: Receives electrical signals from the E312c/E320c’s ECM to drive the throttle linkage, realizing stepless speed regulation from idle (600rpm) to rated speed (1950rpm for E312c, 2000rpm for E320c), with a speed control accuracy of ±10rpm for stable engine power output.
- Idle speed stabilization: Automatically maintains a constant idle speed (600–700rpm) during non-working periods, reducing fuel consumption and engine idle wear for E312c/E320c.
- Load-adaptive speed regulation: Synchronizes with the excavator’s hydraulic system load signals; when the E320c engages in heavy digging or E312c handles medium-load earthmoving, it adjusts engine speed in real time to match hydraulic power demands, avoiding stalling or power loss.
- Fault self-protection: Integrates overcurrent, overheating, and position sensor fault protection functions. If the motor encounters jamming (e.g., due to cable aging or mechanical obstruction) or voltage anomalies, it triggers a signal to the ECM, which then activates a limp-home mode (fixed idle speed) to protect the engine and motor itself.
- ECM communication & diagnostic feedback: Transmits real-time throttle position data to the ECM via a built-in position sensor, enabling the ECM to monitor motor status and display Diagnostic Trouble Codes (DTCs) for faults (e.g., motor open circuit, position sensor failure) on the excavator’s monitor for quick troubleshooting.
Model-Specific Optimizations
- E312c: Optimized for light-load scenarios, with a smaller torque output (matching the 3046T engine’s throttle linkage load) and prioritized fuel efficiency during low-speed operation;
- E320c: Enhanced with higher torque to drive the 3066 engine’s throttle mechanism, ensuring fast and stable speed adjustment during medium-heavy load operations (e.g., foundation pit excavation).
Q3: What are the key technical parameters of the 2475212/247-5212 throttle motor (E312c/E320c matched)?
A3: All technical parameters are calibrated to Caterpillar E312c/E320c’s electrical and mechanical requirements for throttle control:
| Parameter | E312c (2475212/247-5212 Throttle Motor) | E320c (2475212/247-5212 Throttle Motor) |
|---|---|---|
| Operating Voltage | DC 24V (overvoltage: 32V max; undervoltage: 18V min) | DC 24V (overvoltage: 34V max; undervoltage: 17V min) |
| Rated Torque | 2.5N·m | 3.0N·m |
| Speed Regulation Range | 600–1950rpm (matches 3046T engine) | 600–2000rpm (matches 3066 engine) |
| Control Accuracy | ±10rpm | ±8rpm |
| Response Time | ≤0.3s (speed adjustment from idle to rated) | ≤0.25s (speed adjustment from idle to rated) |
| Position Sensor Type | Potentiometer-type (analog signal output) | Potentiometer-type (analog signal output) |
| Protection Rating | IP65 (water/dust proof for engine bay) | IP67 (enhanced sealing for heavy-load engine bay) |
| Operating Temperature Range | -30℃ ~ +80℃ | -40℃ ~ +85℃ |
| Vibration Resistance | ≤15g (10–2000Hz) | ≤20g (10–2000Hz) |
| Power Consumption | ≤25W (rated load) | ≤30W (rated load) |
| Interface Compatibility | 3046T engine ECU/monitor system | 3066 engine ECU/ |
