2218859 Hydraulic Pump High Pressure Sensor for Caterpillar Excavators

Product Overview

The 2218859 (221-8859) is an OEM-quality replacement high pressure sensor built for Caterpillar excavator hydraulic main pumps. It is manufactured to match original fit, dimensions and performance, serving as a key monitoring part for the excavator hydraulic system.

Part Number Cross Reference

• Original CAT part number: 221-8859, 2218859

• Replacement part number: 157-3182, 1573182

Compatible Caterpillar Equipment

• Crawler excavators: 320B, 320C, 320D, 320D GC, 320D L, 321C, 321D, 349D

• Wheeled excavators: M325D, M330D

• Fits S6K engine equipped models

Key Features

• Stainless steel sensor body for corrosion resistance and long service life in harsh job site conditions

• Corrugated tubing protects the wiring harness from abrasion, oil and aging, reducing cable failure risk

• 3-pin waterproof connector, plug-and-play, direct drop-in replacement with no modification needed

• High-precision sensing element delivers stable signal output and accurate pressure readings

• Wide operating temperature range, works reliably in both cold and high-temperature working environments

Function & Working Principle

Mounted on the hydraulic main pump, this transducer converts hydraulic pressure into electrical signals and sends them to the excavator control unit. It helps the system adjust pump output in real time, keeps hydraulic pressure within a safe range, prevents component damage from overpressure, and reduces unplanned downtime.

Quality & Delivery

Every unit goes through pressure calibration and durability testing before shipment. We keep regular stock for this part and support fast worldwide shipping via DHL, FedEx, TNT and other international logistics.