Alternative HDU 27/-series Offline Fine Filter

Introduction

The FM 27/- series Offline Fine Filter is a high-efficiency kidney loop filtration system designed as a direct alternative to the CJC® HDU 27/27 filter unit. models includes FM 27/27, 27/54, 27/81, 27/108

It continuously removes solid particles, varnish, sludge, oxidation products, water, and acidity from hydraulic oil, lubrication oil, turbine oil, gear oil, and industrial fluids.

By maintaining oil cleanliness, the system significantly reduces equipment wear, prevents unexpected failures, and extends both oil and component service life.

Key Benefits

Ultra-Fine Particle Removal

Removes contaminants larger than 3 microns with high efficiency.

3 μm Absolute Filtration
98.7% removal efficiency for particles >3 μm
Continuous kidney loop filtration
ISO cleanliness improvement

Varnish & Sludge Removal

The cellulose filter media effectively captures:

Varnish
Resin
Oxidation by-products
Sludge deposits

This helps prevent:

Sticky servo valves
Valve malfunction
Surface lacquering
Bearing damage

Water Removal Capability

The filter inserts absorb free and emulsified water from oil.

Benefits include:

Reduced corrosion
Prevention of micro-pitting
Reduced bacterial growth
Lower sludge formation

Acid Reduction (TAN Control)

Removes acidic oxidation products that accelerate oil degradation.

Results:

Slower oil aging
Reduced equipment wear
Longer oil service intervals

Why Use an Offline Oil Filtration System?

Studies show that nearly 80% of hydraulic and lubrication system failures are caused by oil contamination.

Common contaminants include:

Hard Contaminants

Metal particles
Dust
Sand
Rubber debris

Soft Contaminants

Varnish
Resin
Oxidation residues
Sludge

Water Contamination

Free water
Dissolved water
Emulsified water

The FM 27/27 continuously cleans oil while equipment is operating, preventing contamination-related failures before they occur.

Technical Specifications

Item	Specification
Model	FM 27/-series
Equivalent Model	CJC® HDU 27/-series
Filter Insert	27/27 Series
Filtration Rating	3 μm Absolute
Motor Power	0.18 kW
Flow Rate	120 – 550 L/h
Operating Temperature	10°C – 80°C
Filtration Type	Offline / Kidney Loop
Installation	Independent Bypass System

System Components

The filtration unit consists of:

Electric motor
Gear pump
Filter housing
Filter insert
Pressure gauge
Control components
Inlet connection
Outlet connection
Drain port

The compact design allows easy installation on existing hydraulic and lubrication systems.

Filter Insert Performance

Solid Particle Retention

Each filter insert provides:

3 μm Absolute Filtration
0.8 μm Nominal Filtration
50% retention efficiency for particles >0.8 μm

Dirt Holding Capacity

Depending on insert type:

4 – 16 liters of solid contaminants

Varnish Absorption Capacity

Retains:

Oxidation products
Resin
Sludge
Varnish

Capacity:

Up to 4 – 16 kg of degradation products

Water Absorption Capacity

Can absorb:

Up to 2,000 – 8,000 mL water

Equivalent to approximately 50% of total contaminant holding capacity.

Available Replacement Filter Inserts

We supply replacement filter inserts compatible with CJC® systems.

A Series

For low-flow applications and smaller oil reservoirs.

B Series

For larger systems and higher flow rates.

F Series

Designed for:

Quenching oils
Diesel oils

BLA Series

Suitable for:

Water-based fluids
Emulsions

BLDA Series