Charger 55 Diesel 250 / 500 Hour Service kit

Essential Maintenance and Components for Diesel-Powered Screw Compressors

Compact yet powerful, diesel-powered screw compressors fitted with Yanmar engines are designed for mobile and remote applications where reliability is critical. To keep performance high and downtime low, regular maintenance of both the compressor side and engine side components is essential.

This guide outlines the key parts and service intervals to ensure your unit continues to deliver consistent, clean, and efficient compressed air.

Key Components and Their Roles

Compressor Side

Compressor Air Filter

• Purpose: Filters out dust and airborne debris before it enters the compressor element.

• Key Features: High-efficiency filter media ensures clean intake air for maximum compressor life.

• Tip: Replace at regular intervals or sooner in dusty environments to maintain airflow and reduce internal wear.

Compressor Oil Filter

• Purpose: Removes fine contaminants from compressor oil to protect bearings and rotating elements.

• Key Features: Pleated design for increased surface area and a reliable bypass valve for uninterrupted flow.

• Tip: Always use high-quality filters designed specifically for screw compressors.

Oil-Air Separator

• Purpose: Separates oil from compressed air, reducing oil carryover and ensuring oil recirculates efficiently.

• Key Features: Multi-stage separation with high-pressure compatibility.

• Tip: A clogged separator increases oil consumption and can reduce air quality—replace as per service schedule.

Compressor Oil

• Purpose: Provides vital lubrication, cooling, and sealing for screw compressor elements.

• Key Features: Synthetic-blend or full-synthetic oil with high thermal stability and anti-wear additives.

• Tip: Check levels regularly and change as per manufacturer recommendation or if oil degrades sooner due to heavy use.

Engine Side (Yanmar L100 Diesel)

Engine Air Filter

• Purpose: Protects the Yanmar engine by filtering intake air before combustion.

• Key Features: Rugged and efficient filtration to handle dirty jobsite conditions.

• Tip: Replace regularly to prevent loss of power and increased fuel consumption.

Engine Oil Filter

• Purpose: Filters contaminants from engine oil to ensure reliable engine lubrication.

• Key Features: Built to withstand the pressure and heat of a compact diesel engine.

• Tip: Never substitute with generic filters—always use engine-specific options for Yanmar compatibility.

Engine Fuel Filter

• Purpose: Cleans fuel of rust, water, and debris before it reaches the injectors.

• Key Features: High dirt-holding capacity and water separation ability.

• Tip: Regular replacement is critical—dirty fuel can quickly damage injectors and pumps.

Fuel Tank Strainer / Pre-Filter

• Purpose: First layer of defence to trap larger debris at the fuel tank before reaching the main filter.

• Key Features: Durable mesh or screen-type strainer.

• Tip: Often overlooked—clean or replace to protect downstream filters and fuel lines.

Recommended Service Intervals

250-Hour Service Kit

Replace:

1. Compressor Air Filter

2. Compressor Oil Filter

3. Compressor Oil

4. Engine Air Filter

5. Engine Oil Filter

6. Engine Fuel Filter

7. Fuel Tank Strainer

500-Hour Service Kit

Replace:

1. Compressor Air Filter

2. Compressor Oil Filter

3. Oil-Air Separator

4. Compressor Oil

5. Engine Air Filter

6. Engine Oil Filter

7. Engine Fuel Filter

8. Fuel Tank Strainer

Why Preventative Maintenance Matters

• Consistent Performance: Clean filters and fresh oil help maintain optimal airflow, pressure, and fuel efficiency.

• Protection: Replacing wear components on time prevents more costly damage to both the engine and compressor.

• Longevity: A well-maintained unit will run cooler, last longer, and remain reliable in demanding conditions.

Tip: Always use OEM-quality parts and fluids for best results with Yanmar-powered units.