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Husqvarna FS400 Parts

by Blades Admin

Husqvarna FS400 Parts: Complete Guide to Replacement Components, Maintenance, and Long-Term Reliability

When professionals search for Husqvarna FS400 parts, they are typically looking for reliable replacement components that keep their walk-behind concrete saw running at peak performance. The FS400 platform—most commonly referenced as the FS 400 LV—is widely used for concrete and asphalt cutting, which means wear parts, service components, and maintenance items are a normal part of ownership.

Understanding which Husqvarna FS400 parts wear out first, how the system is built, and how to identify the correct replacement parts helps reduce downtime, control repair costs, and extend the overall lifespan of the saw.

The FS400 is manufactured by Husqvarna, a global leader in professional concrete cutting equipment, diamond tools, and construction machinery. Genuine Husqvarna parts are engineered to match factory tolerances, ensuring correct fit, safety, and performance.

What Are Husqvarna FS400 Parts?

Husqvarna FS400 parts include every serviceable, replaceable, or wearable component on the FS400 walk-behind concrete saw. These parts support cutting performance, operator safety, drivetrain reliability, and water-assisted dust control.

They fall into several major categories:

  • Engine and fuel system parts

  • Blade shaft and cutting system components

  • Belts, pulleys, and drive components

  • Frame, handles, and control assemblies

  • Water system and wet-cutting components

  • Safety guards and protective covers

Each group plays a critical role in keeping the saw operating safely and efficiently.

Why Genuine Husqvarna FS400 Parts Matter

Using genuine Husqvarna FS400 parts is important for both performance and safety. The FS400 operates under high load, vibration, and heat—especially during asphalt cutting—so precision-fit components are essential.

Benefits of genuine parts include:

  • Exact fit and correct tolerances

  • Maintained cutting accuracy and alignment

  • Longer service life under jobsite conditions

  • Reduced risk of premature failure

  • Continued compatibility with factory safety systems

Aftermarket or mismatched components may appear cheaper upfront but can cause accelerated wear, vibration issues, or alignment problems that lead to larger repairs.

Commonly Replaced Husqvarna FS400 Parts

Some FS400 parts are replaced more often due to normal wear from cutting concrete and asphalt.

Drive Belts

Drive belts transfer engine power to the blade shaft. Over time, belts can stretch, glaze, or crack due to heat and load.

Signs belts need replacement:

  • Slipping during cutting

  • Reduced blade speed

  • Visible cracking or fraying

  • Burning rubber smell

Replacing belts on schedule helps maintain consistent cutting depth and speed.

Blade Shaft Bearings

Blade shaft bearings support smooth rotation of the cutting spindle. They are exposed to vibration, slurry, and dust.

Symptoms of worn bearings include:

  • Excessive vibration

  • Grinding or whining noises

  • Uneven blade wear

  • Shaft play

Timely bearing replacement prevents damage to the blade shaft and housing.

Blade Flanges and Arbor Hardware

Blade flanges and arbor bolts secure the diamond blade. These components must remain true and undamaged to ensure safe cutting.

Worn or damaged flanges can cause:

  • Blade wobble

  • Uneven cuts

  • Increased vibration

  • Accelerated blade wear

Water System Components

The FS400 relies on wet cutting to control dust and cool the blade. Common water-system parts include:

  • Water tank

  • Hoses and fittings

  • Valves and flow controls

  • Spray nozzles

Clogged or leaking components reduce dust suppression and blade life.

Throttle and Control Cables

Control cables connect the operator controls to the engine and cutting system. Over time, they may stretch or bind.

Common issues include:

  • Delayed throttle response

  • Sticking controls

  • Inconsistent engine speed

Replacing worn cables restores smooth, predictable operation.

Engine and Fuel System Parts

The Husqvarna FS400 typically uses a gasoline engine, and engine-related parts are among the most frequently serviced.

Common Engine Parts

  • Air filters

  • Spark plugs

  • Fuel filters

  • Carburetor components

  • Recoil starter assemblies

Regular replacement of these parts improves starting reliability, fuel efficiency, and engine longevity.

Fuel System Maintenance

Because jobsite fuel is often exposed to dust and moisture, fuel system parts can clog or degrade. Replacing filters and inspecting hoses helps prevent hard starting and power loss.

Cutting System and Blade-Related Parts

The cutting system is the heart of the FS400, and many parts directly affect cut quality.

Blade Shaft Assembly

This includes:

  • Shaft

  • Bearings

  • Housing

  • Retainers

Maintaining this assembly ensures straight, accurate cuts and protects the saw from vibration damage.

Blade Guards

Blade guards are critical safety components that also help manage slurry during wet cutting. Cracked or bent guards should be replaced immediately.

Depth Adjustment Components

Depth control systems include:

  • Handwheels

  • Adjustment rods

  • Locking mechanisms

These parts allow precise control of cutting depth, especially important for expansion joints.

Frame, Handle, and Operator Components

Structural and operator-interface parts contribute to stability, comfort, and safety.

Frame and Chassis Parts

The FS400 frame supports the engine, blade shaft, and controls. While durable, parts such as mounts, brackets, and fasteners may require replacement after years of vibration.

Handle Assemblies

Handle components include:

  • Grips

  • Mounts

  • Vibration-damping elements

Replacing worn handle parts improves comfort and reduces operator fatigue.

Safety-Related Husqvarna FS400 Parts

Safety components should never be ignored or bypassed.

Key safety parts include:

  • Blade guards

  • Belt covers

  • Emergency stop components

  • Warning decals

Using correct replacement parts ensures the saw continues to meet safety expectations on professional jobsites.

How to Identify the Correct Husqvarna FS400 Parts

Accurate identification is essential when ordering parts.

Model and Serial Number

Always reference:

  • Model designation (FS400 / FS 400 LV)

  • Serial number

These details ensure compatibility with the correct production variant.

Exploded Parts Diagrams

Husqvarna provides detailed exploded diagrams that show:

  • Individual components

  • Part numbers

  • Assembly order

These diagrams are the best way to verify you’re ordering the correct part.

Preventive Maintenance Using FS400 Parts

Replacing parts before failure reduces downtime and repair costs.

Preventive maintenance typically includes:

  • Regular belt inspection and replacement

  • Routine air and fuel filter changes

  • Water system flushing

  • Bearing inspection

  • Fastener torque checks

A well-maintained FS400 runs smoother, cuts straighter, and lasts significantly longer.

OEM vs Aftermarket Husqvarna FS400 Parts

While aftermarket parts may be available, OEM Husqvarna FS400 parts are recommended for professional use.

OEM advantages:

  • Factory-tested compatibility

  • Correct materials and tolerances

  • Maintained warranty integrity

  • Predictable service life

For critical components like blade shaft parts, belts, and safety guards, OEM parts are strongly preferred.

Who Uses Husqvarna FS400 Parts?

FS400 replacement parts are commonly purchased by:

  • Concrete contractors

  • Asphalt repair crews

  • Municipal maintenance departments

  • Equipment rental companies

  • Property maintenance professionals

Because the FS400 is widely used, parts availability remains strong.

FAQs About Husqvarna FS400 Parts

What are Husqvarna FS400 parts used for?
They are used to repair, maintain, and restore FS400 walk-behind concrete saws.

Are FS400 and FS400 LV parts the same?
Most references to FS400 parts apply to the FS 400 LV, but always confirm by serial number.

What parts wear out most often on the FS400?
Belts, blade shaft bearings, filters, water hoses, and control cables are common wear items.

Can I use aftermarket parts on my FS400?
Aftermarket parts exist, but OEM Husqvarna parts are recommended for reliability and safety.

How do I find the correct FS400 part number?
Use the model and serial number with Husqvarna exploded parts diagrams.

Do FS400 parts affect cutting accuracy?
Yes. Worn bearings, belts, or flanges can cause vibration and uneven cuts.

Are blade guards considered replacement parts?
Yes. Blade guards are safety components and should be replaced if damaged.

How often should FS400 belts be replaced?
Replacement depends on usage, but regular inspection is recommended on high-hour machines.

Can worn parts damage diamond blades?
Yes. Misalignment and vibration from worn parts can shorten blade life.

Are FS400 parts readily available?
Yes. The FS400 is a popular model with strong ongoing parts support.

Final Thoughts on Husqvarna FS400 Parts

Husqvarna FS400 parts are essential for maintaining the performance, safety, and longevity of one of the most widely used compact walk-behind concrete saws on the market. From belts and bearings to water-system components and blade guards, each part plays a critical role in reliable daily operation. By using genuine Husqvarna replacement parts, following preventive maintenance schedules, and identifying components accurately, contractors and crews can keep their FS400 cutting clean, straight, and efficiently for years of demanding jobsite use.



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