345C Hydraulic Main Pump Assembly Compatible with CAT

Welcome to LongYing hydraulic supply. We specialize in providing the complete CAT 345C excavator 3 Hydraulic Main Pump Assembly assembly, precision-manufactured as a heavy-duty aftermarket replacement power pump compatible with CAT heavy mining engineering machinery equipment.

1. Product Overview & Factory Price Range

Designed for extreme open-pit mining and heavy earthmoving applications, this power unit resolves high heat pressure drops and weak compound operations. Direct factory wholesale pricing ranges from $4,500 to $8,200 USD depending on customization and bulk orders.

2. Complete Assembly vs. Repair Kit Selection

3. 5-Step Factory Quality Inspection Process

• Step 1: Raw Material Spectral Analysis: Ensures strict compliance with high-grade alloy steel specifications.
• Step 2: Precision CNC Machining: Micro-meter tolerance control for valve plates and cylinder blocks.
• Step 3: Component Ultrasonic Cleaning: Removes all microscopic burrs and manufacturing debris.
• Step 4: Dynamic Full-Load Bench Testing: Simulates extreme hydraulic pressure up to 35MPa.
• Step 5: Anti-Rust Sealing & Export Packaging: Secure wooden crating for international shipping protection.

4. Hydraulic Main Pump Troubleshooting Guide

• Issue 1: Cold machine runs fine, hot machine drops pressure. Root Cause: Severe wear on valve plate and cylinder block matching faces. Solution: Replace with LongYing precision matching pump assembly.
• Issue 2: Abnormal pump noise and cavitation vibration. Root Cause: Air suction in inlet hose or clogged suction filter. Solution: Check suction pipeline integrity and replace filter elements.
• Issue 3: Insufficient pilot and main system working pressure. Root Cause: Regulating valve sticking or internal leakage in swashplate servo piston. Solution: Clean spool valve or replace internal control seals.
• Issue 4: Metal debris found in return oil filter element. Root Cause: Piston slipper or bearing cage fatigue failure. Solution: Flush hydraulic tank completely and install new main pump.
• Issue 5: Slow actuator response under compound movements. Root Cause: Swashplate feedback linkage dead band or insufficient displacement control pressure. Solution: Calibrate displacement sensor and check regulator pressure.

5. Cross-Category & Brand Product Recommendation Matrix

6. Frequently Asked Questions (FAQ)

Q1: Is this a direct drop-in replacement for the original CAT part?
A1: Yes, it is 100% dimensionally interchangeable with OEM specifications for easy installation.

Q2: What is your standard warranty period?
A2: We offer a comprehensive 12-month standard warranty on all hydraulic main pump assemblies.