Echo 20-Inch Ranch Chainsaws (Field Test)

The Echo CS-590 Timber Wolf with a 20-inch bar is a capable landowner saw for bucking and occasional felling of suitable timber, but bar length is not a safe cutting-capacity rating. Its 59.8 cc engine is rated at 3.9 hp. Wood, cut conditions, operator skill, and hazards determine whether a job is appropriate.

A common complaint when comparing ranch saws is that the bar length looks like a clear measure of cutting ability. It is not. A 20-inch bar tells you the bar’s nominal length, not how wide a tree you can safely fell in one pass or how well the saw will handle a particular hardwood.

I assess this setup from published specifications and practical work requirements, rather than claiming instrumented field results I cannot verify. The key question is whether the CS-590’s power and 20-inch configuration suit your work, and whether you can keep the saw sharp, maintained, and under control. Here is how I would judge it before buying or taking it to a job.

Equipment Setup and Safety Preparation

This section covers how to confirm the 20-inch setup, prepare the saw, and reduce avoidable risks before starting. A correct fit matters: the bar, chain, and drive sprocket must match. Safety gear and a clear work area are essential, but they do not make an unsuitable cut safe.

The CS-590 has a 59.8 cc engine and a rated output of 3.9 hp. Those figures place it in a substantial landowner-saw class, but they do not predict performance in every log. Hardwood density, log diameter, frozen or dirty wood, chain sharpness, and operator technique all affect cutting.

On a common 20-inch configuration, the chain has a 3/8-inch pitch and .050-inch gauge. Pitch is the spacing between the chain’s drive links; gauge is the thickness of those links where they fit into the bar groove. Configurations can vary, so check the bar label and chain markings before ordering. Also confirm the required drive-link count. A chain that matches pitch and gauge can still be the wrong length.

Before use, inspect the chain, bar rails, sprocket, fasteners, chain brake, throttle lockout, and chain catcher. Check fuel and bar-oil levels. Wear a helmet, eye and face protection, hearing protection, chainsaw-rated leg protection, gloves, and boots. Plan stable footing and, for felling, clear escape routes. Follow ANSI Z133 practices and applicable OSHA requirements.

Start the saw cold or warm as directed in the operator’s manual. Keep the brake engaged during starting, and use the manual’s method for holding the saw or placing it on firm ground. Once it is running, confirm that the chain stays still at idle and that lubrication reaches the chain before cutting. If the chain moves at idle, stop and address the fault.

Field Cutting and Landscaping Operation

This section explains what the 20-inch setup is suited to and where its limits matter. Bucking means cutting a felled trunk or limb into shorter sections. Felling means bringing a standing tree down. Each task calls for a separate risk check; a longer bar does not make either task automatically safe.

For ranch work, the CS-590 can be a sensible choice when you regularly buck logs and sometimes fell trees that are appropriate for your experience and equipment. A 20-inch bar can reach farther than a shorter bar, but that reach is not a promise that a 20-inch trunk can be safely cut in one pass. Tree lean, branch load, internal decay, wind, and nearby structures may matter more than the diameter alone.

Use two hands and a firm stance. Keep the bar nose clear of the wood and other obstructions. Contact with the upper part of the bar tip can cause rotational kickback, which drives the saw back toward the operator. Do not cut with the tip, and do not rely on the chain brake to prevent kickback. A brake is a safety device, not a substitute for control or training.

Pinching is another practical limit. A cut can close on the bar when wood shifts or is under tension. Stop and reassess if a log moves, hangs up, or behaves differently than expected. Do not force a dull chain through wood, and do not cut above shoulder height. For felling or complex landscape removals, use a trained sawyer; walk away if the job exceeds your skill.

These planning examples are not claims of measured field-test results:

• Routine bucking: For a stable, already-felled log in an open work area, the CS-590 may fit the job if the chain is sharp and the cut can be made with secure footing and good control. Check for tension or compression in the wood before choosing a cut.
• Occasional felling: A standing tree needs an assessment of lean, crown weight, wind, escape paths, and nearby hazards. If the tree’s direction or movement is uncertain, do not treat the 20-inch bar as a solution. Get qualified help.
• Brush and small limbs: A 20-inch setup may be less convenient than a shorter, lighter saw for repeated small cuts. Choose for the work you do most often, not just the largest cut you hope to make.

As a buying decision, this setup makes more sense for regular log work than for occasional light pruning. If most of your jobs are small limbs, the extra bar reach may not serve you. If your work includes larger timber, a 20-inch bar still does not replace suitable training, safe methods, or a more appropriate saw and crew.

Maintenance, Sharpening, and Carburetor Service

This section covers the upkeep that preserves cutting performance and helps reveal faults early. A sharp chain, sound bar, and correct lubrication matter as much as engine size. Use the saw’s current operator’s manual and the chain maker’s instructions for service steps and adjustment limits.

After the saw is switched off and the brake is engaged, let it cool in a clear area before cleaning or inspecting it. Check chain tension, cutters, depth gauges, the bar groove, and oil passages. Clean chips from the saw and inspect the bar rails for damage or uneven wear. Refuel only with the engine stopped and cool, away from ignition sources.

A depth gauge controls how much wood each cutter removes. Set it to the chain manufacturer’s specification; .025 inch is common for some 3/8-inch chains, but it is not a universal setting for every CS-590 chain. Use the specified file and gauge tools, and replace a chain or bar if wear or damage is beyond the maker’s service limits.

Use bar-and-chain oil, but do not assume one oil viscosity or oil-flow rate suits every temperature and oil formulation. Check lubrication as described in the manual. If the chain is dry, the oil tank is empty, or the oil passages appear blocked, stop cutting and diagnose the issue rather than continuing.

The stated engine speeds are approximately 2,800 rpm at idle and 12,800 rpm maximum. These are service reference points, not instructions to tune by ear. Follow the model-specific manual and use a tachometer when service limits call for it. If the saw will not idle correctly or its engine speed seems wrong, seek qualified service rather than making uncertain carburetor adjustments.

Quick fault checks

• Chain moves at idle: Stop the saw and have the idle setting or clutch checked.
• Chain appears dry: Stop, check bar oil, and inspect the oil path as directed in the manual.
• Cutting slows: Check sharpness, chain tension, and bar condition before assuming the engine lacks power.
• Engine speed seems abnormal: Use model-specific service guidance and a tachometer; do not tune by ear.

Storage and Seasonal Care

This section explains how to put the saw away without leaving fuel, dirt, or damage unaddressed. Storage needs depend on the fuel product and the manufacturer’s instructions. The safe baseline is to clean and inspect the saw, protect the cutting equipment, and follow the current manual for fuel handling and long-term storage.

After work, switch the saw off, engage the brake, and let the engine cool in a clear area. Clean chips from around the clutch cover and cooling areas, then inspect the chain, bar, and fasteners. Store the saw so the bar and chain are covered and cannot contact people or other objects.

Do not use straight gasoline, a guessed oil ratio, or stale fuel. The specified mix is 50:1 gasoline to ECHO-approved 2-cycle oil, using fresh fuel and the gasoline requirements in the current operator’s manual. Incorrect lubrication or degraded fuel can damage the engine, including causing seizure. Follow the manual’s instructions for fuel during longer storage; do not improvise a storage method.

Before the next job, inspect the saw again rather than assuming it is ready because it was put away clean. Check chain tension, safety controls, fuel and oil levels, and the cutting equipment. If a part is damaged or a control does not work, repair it before cutting.

Conclusion and Buying Decision

The CS-590 with a 20-inch bar is best judged as a substantial ranch and landowner setup for bucking and occasional, suitable felling—not as a one-pass capacity guarantee. Its 59.8 cc engine and 3.9 hp rating provide useful context, but they cannot account for every species, log condition, or cut.

I would shortlist this configuration if your regular work includes bucking sizable logs and you have the training and maintenance routine to use it safely. I would look at a shorter-bar setup for mainly small-limb work, and I would not buy based on bar length alone. Before purchase, confirm the exact bar and chain configuration, local service support, and current manual requirements.

FAQ

Is the Echo CS-590 powerful enough for a 20-inch bar?
The CS-590 is rated at 59.8 cc and 3.9 hp. Suitability depends on wood, chain condition, cut type, and operator skill, not bar length alone.

Does a 20-inch bar mean the saw can cut a 20-inch tree in one pass?
No. Bar length is not a safe one-pass capacity rating. Tree shape, hazards, wood condition, and the operator’s skill affect the cut.

What chain fits the CS-590 with a 20-inch bar?
A common setup uses 3/8-inch pitch and .050-inch gauge. Verify the bar label, chain markings, and required drive-link count before buying.

What fuel mix does the CS-590 use?
Use a 50:1 gasoline-to-ECHO-approved 2-cycle oil mix. Use fresh fuel and follow the current operator’s manual for gasoline requirements.

What is the CS-590’s maximum engine speed?
The approximate maximum is 12,800 rpm, with idle around 2,800 rpm. Use the model-specific manual and a tachometer for service limits.

Is .025 inch the correct depth-gauge setting?
Not for every chain. It is common for some 3/8-inch chains, but follow the specification from the chain manufacturer.

Can I adjust the carburetor by ear?
No. Use the model-specific service limits and a tachometer, or have a qualified technician service the saw.

What should I do if the chain moves at idle?
Stop using the saw. The idle setting or clutch may need attention; do not continue cutting until the problem is resolved.

(This article was written by one of our staff writers, Marcus Thorne. Visit our Meet the Team page.)