Caterpillar 508-1900 Piston Kit (for C4.4 Engine) Detailed Introduction

Overview

The 508-1900 is a genuine OEM piston assembly kit engineered and manufactured by Caterpillar, purpose-built for the C4.4 series heavy-duty diesel engines. As a core component of the engine combustion system, this piston kit converts thermal energy from fuel combustion into mechanical power via reciprocating motion, while ensuring stable compression, optimal combustion efficiency, and reliable lubrication sealing. It is designed to deliver consistent performance and extended service life under demanding operating conditions in construction, agriculture, power generation, and material handling applications.

Core Technical Specifications

Parameter	Specification
Official Part Number	508-1900
Component Type	Complete Single-Cylinder Piston Assembly Kit
Primary Compatible Engine	Caterpillar C4.4 Series Diesel Engines
Unit Weight	Approx. 4.5 lbs (2.04 kg) per kit
Piston Body Material	High-strength heat-resistant aluminum alloy
Piston Pin Configuration	Full-floating hardened steel design
Supply Condition	Genuine new; premium aftermarket replacement options available
Compatible Fuel	Ultra-low sulfur diesel (ULSD) & standard low-sulfur diesel

Key Features & Performance Advantages

1. Precision Calibration for OEM-Grade Fit & Performance

Manufactured to Caterpillar's strict dimensional and performance tolerances, the 508-1900 piston kit guarantees perfect drop-in compatibility with C4.4 engine cylinders. The precision-machined combustion bowl and ring grooves ensure consistent compression ratios across all cylinders, maintaining the engine's rated power output (up to 150 kW / 200 hp) and factory-calibrated fuel efficiency.

2. Heavy-Duty Construction for Extreme Durability

The piston body is forged from high-grade aluminum alloy with optimized thermal conductivity, delivering excellent thermal stability and fatigue resistance under high combustion temperatures and continuous heavy loads. The piston skirt features a wear-resistant low-friction coating to reduce friction against the cylinder liner, minimize scuffing risk, and extend the service life of both the piston and cylinder bore.

3. High-Performance Piston Ring Package

The kit includes a complete set of precision-engineered piston rings (two compression rings and one oil control ring) with advanced surface treatments such as chrome plating and gas nitriding. This design delivers superior gas sealing performance, effectively reducing blow-by and oil consumption, while maintaining excellent abrasion and corrosion resistance for long-term reliable operation.

4. Full-Floating Piston Pin Design

The kit comes with a hardened steel full-floating piston pin and matching retaining circlips. This design allows uniform load distribution across the pin, piston pin bosses, and connecting rod small end, reducing localized wear and improving overall reliability under high torque and variable load conditions.

5. Emissions Compliance Support

Calibrated to match the combustion parameters of C4.4 engines, the 508-1900 piston kit supports compliance with stringent global emissions standards including U.S. EPA Tier 3, Tier 4 Final, and EU Stage IIIA / Stage V, depending on the specific engine configuration.

Kit Components

Each 508-1900 piston kit contains all necessary components for single-cylinder service replacement:

• 1 × Aluminum alloy piston body with machined combustion bowl
• 1 × Complete piston ring set (top compression ring, second compression ring, oil control ring)
• 1 × Hardened steel full-floating piston pin
• 2 × Piston pin retaining circlips

Compatibility

Compatible Engine Models

• Caterpillar C4.4 series diesel engines (naturally aspirated, turbocharged, and turbocharged aftercooled configurations)
• Compatible with industrial, construction, and generator set variants of the C4.4 platform

Applicable Equipment

This piston kit is widely used in Caterpillar equipment including, but not limited to:

• Backhoe Loaders: 416E, 416F, 420E, 420F, 422E, 428E, 430F, 442E
• Wheel Loaders: 910K, 914K
• Compactors & Paving Equipment: CB-534D, CB-564D, CP-433E, CS-433E, CS-533E series
• Generator Sets: C4.4DE series industrial generator sets
• Agricultural & Forestry Equipment: Tractors, harvesters, and irrigation power units equipped with C4.4 engines

Cross Reference Part Numbers

The 508-1900 piston kit can be cross-referenced with the following equivalent part number formats:

• 5081900 (hyphen-free standard format)
• CA5081900 (Caterpillar aftermarket part number format)

Warranty & Maintenance Recommendations

Genuine Caterpillar 508-1900 piston kits are covered by a 12-month global parts warranty against defects in materials and workmanship, supported by Caterpillar's worldwide dealer network.iDjR
For maximum service life and optimal engine performance:

• Always inspect and replace cylinder liners and connecting rod bearings when installing new pistons during engine overhaul
• Use Caterpillar approved engine oils and follow the recommended oil change intervals
• Replace engine fuel and oil filters at scheduled maintenance intervals to prevent abrasive contamination
• Ensure proper piston-to-cylinder clearance and ring end gap during installation per Caterpillar service specifications
• Use clean, high-quality ultra-low sulfur diesel to avoid premature corrosion and wear of piston components