Craftsman 917773703 high wheel line trimmer Parts

A gas high wheel line trimmer like the Craftsman 917773703 typically lasts 8 to 12 years with routine maintenance and normal homeowner use. Keeping the engine clean for airflow, changing oil, and replacing worn trimmer line on time are the biggest factors in extending service life (see the owner's manual).

Typical lifespan ranges

Lifespan depends most on hours of use, storage, and maintenance. Here are practical expectations for this type of trimmer:

Use pattern	Typical lifespan	What usually ends the life
Light homeowner (seasonal trimming)	10 to 12 years	Fuel system issues, neglected maintenance
Average homeowner (weekly in season)	8 to 10 years	Drive belt wear, engine wear
Heavy use (large property, rough conditions)	5 to 8 years	Cutting head wear, drivetrain wear

Maintenance that extends engine life

Your manual calls out cleaning and routine checks that directly help the engine run cooler and last longer.

• Keep the top of the engine around the starter clear of grass and chaff to maintain airflow
• Frequently clean the underside of the trimmer to prevent heavy grass buildup
• Check engine oil level before use; change oil on schedule (oil capacity is typically 20 oz for this model)
• Clean or replace the air filter as recommended
• Inspect and service the spark plug (Champion RJ19LM or J19LM, .030 in gap)

Wear items that affect performance first

Many “end of life” complaints are really normal wear parts that are replaceable.

• Trimmer line: use .155 in diameter; replace when worn to less than half its original length
• Drive system: if the unit stops self-propelling, inspect the belt and pulleys; replace the high-wheel trimmer driveshaft belt 532185476 if worn or broken
• Cutting head wear: avoid letting the trimmer head ride on concrete or asphalt, which can wear the mow ball prematurely

Why it matters

A line trimmer usually fails gradually: harder starting, reduced cutting power, vibration, or loss of drive. Staying ahead of basic cleaning and scheduled service prevents overheating and premature engine wear, which is the most expensive type of failure.

Last updated: February 2026

No. Strimmer (trimmer) spools and line are not universal; the correct size depends on your specific trimmer model. For the Craftsman high wheel line trimmer model 917773703, the specified cutting line is 0.155 inch diameter and each piece is cut to 18-3/4 inches (18.75 inches); see the owner's manual.

What fits the Craftsman 917773703

This model uses fixed-length line pieces installed on the carrier plate (not a typical bump-feed spool). For best cutting and smooth operation:

• Use 0.155 inch diameter trimmer line
• Cut each line to 18-3/4 inches
• Replace lines when they wear to about half their original length
• Keep both sides matched in length (within about 1 inch) to reduce vibration
• Never substitute wire, rope, or string; those can break and become hazardous

Quick compatibility checklist (before you buy line)

Use this checklist to avoid line that will not fit or will cause vibration:

• Confirm your model number is 917773703
• Match the diameter first (0.155 inch for this model)
• Match the cut length (18-3/4 inches)
• Verify your trimmer uses a carrier plate/retainer clip style head
• If buying bulk line, plan to cut equal lengths for both sides

Common line sizes vs this model

Item	Many handheld trimmers	Craftsman 917773703 high wheel trimmer
Line diameter	Often 0.065 to 0.095 inch	0.155 inch
Feed style	Spool (bump-feed or auto-feed)	Pre-cut pieces on carrier plate
Line length	Varies by spool	18-3/4 inches per piece

Why it matters

Using the wrong diameter can prevent the line from seating correctly in the carrier plate, and mismatched line lengths can unbalance the cutting head. That leads to excess vibration, faster wear on the driveline components, and rough trimming.

Last updated: February 2026

To start the Craftsman 917773703 4-cycle high wheel line trimmer, make sure the engine has the correct oil level (4-cycle engines do not use a gas and oil mix), set the throttle to FAST, then follow the starting steps in the owner's manual.

Quick start steps (4-cycle)

• Place the trimmer on level ground with the trimmer head clear of debris.
• Check engine oil on the dipstick; add oil if needed (do not overfill).
• Move the throttle lever to FAST (FAST is the starting position).
• Prime if your engine has a primer bulb (press it several times until you see fuel moving).
• Pull the starter rope briskly; once it starts, let it warm up briefly.
• To stop the engine, move the throttle to STOP.

Before you pull the cord: what to check

Starting problems are usually fuel, spark, or airflow. These checks fix most no-starts:

• Oil level: Too little oil can prevent safe operation; too much oil can cause smoking on startup.
• Fuel: Use fresh gasoline; old fuel can make starting difficult.
• Throttle position: Starting and normal trimming are done in FAST.
• Spark plug wire: Make sure it is firmly connected.
• Air filter: A dirty filter can cause hard starting and poor performance.

4-cycle vs 2-cycle fuel: the key difference

Engine type	Fuel in tank	Oil location
4-cycle (this trimmer)	Straight gasoline	Separate crankcase (fill/check with dipstick)
2-cycle	Gas mixed with 2-cycle oil	Mixed into fuel

Why it matters

Using a gas and oil mixture in a 4-cycle trimmer can cause heavy smoke, fouled spark plug, and poor trimming performance. Keeping the throttle on FAST for starting and maintaining correct oil level helps the engine start easier and keeps the trimmer head running consistently.

Last updated: February 2026

To replace the trimmer line on your Craftsman high wheel line trimmer model 917773703, we install two equal-length pieces of line into the carrier plate and seat each one under its retainer clip. The key is cutting the correct length first and making sure both sides match.

Before you start (safety)

• Shut the engine off and let it cool.
• Disconnect the spark plug wire and keep it away from the plug.
• Wear gloves and eye protection.
• Tip the trimmer only as needed; keep fuel from spilling.

Cut the line to the correct length

Your 917773703 uses 0.155-inch diameter trimmer line. If you buy bulk line, cut each piece to 18-3/4 inches. The debris shield has a built-in length gauge to help you measure and cut consistently.

Steps to replace the trimmer line

1. Disconnect the spark plug wire.
2. Pull out and remove the worn line from the carrier plate.
3. Cut two new pieces of line to the correct length.
4. Fold one piece in half.
5. Insert the folded end through the carrier plate opening to the back side of the retainer clip.
6. Pull the line outward until it is fully seated under the retainer clip.
7. Repeat for the other side.
8. Confirm both lines are the same length, then reconnect the spark plug wire.

For the diagrams and the exact carrier plate and clip locations, follow the Maintenance section in the owner's manual.

Quick checks if the line keeps coming out

• Line is the wrong size (use 0.155-inch diameter).
• Line is not fully seated under the retainer clip.
• Lines are uneven lengths.
• The carrier plate or retainer clip is worn or damaged (replace the carrier plate if needed).

Common parts involved (if you need replacements)

What you are servicing	What it does	When to replace
Line trimmer carrier plate 594935003	Holds and retains the trimmer line	Line will not stay seated, openings are worn
Trimmer line (0.155-in)	Cutting line	Worn to less than half original length

Why it matters

Correct line length and proper seating under the retainer clip prevents tangling, reduces breakage, and restores cutting performance. Keeping both lines equal also helps the trimmer cut evenly and reduces vibration.

Last updated: February 2026

For the Craftsman 917773703 high wheel line trimmer, use unleaded regular gasoline and fill the engine with SAE 30 oil (above 32°F) or SAE 5W-30 (below 32°F). This model is a 4-cycle style engine that uses straight engine oil in the crankcase, not a 2-cycle fuel mix; see the owner's manual.

What to use (fuel and oil)

• Gasoline: Unleaded regular
• Gas tank capacity: About 1.6 quarts
• Engine oil type (above 32°F): SAE 30 (API SF-SJ)
• Engine oil type (below 32°F): SAE 5W-30
• Oil capacity: About 20 oz

Quick temperature guide

Outdoor temperature	Oil to use	Why
Above 32°F (0°C)	SAE 30	Better viscosity for warm-weather mowing/trimming
Below 32°F (0°C)	SAE 5W-30	Easier starting and better cold-flow protection

Why your “2-cycle” question matters

Many handheld trimmers are 2-cycle and require a gas and 2-stroke oil mix. The Craftsman 917773703 high wheel line trimmer is different: it has an engine oil fill cap with dipstick and a specified oil change schedule, which means it runs on straight gasoline plus separate engine oil.

Before you start (important checks)

• Add engine oil before the first start; the trimmer ships without oil or gasoline.
• Check the oil level before each use.
• Wipe up any spilled fuel or oil before starting.
• Keep fuel and oil off tires and plastic parts.
• Let the engine cool before storing.

Helpful related parts for maintenance

If you are doing routine service or a teardown, these commonly replaced hardware items are available for this model:

• Hex flange lock nut 532409149
• Lock nut 596322601
• Husqvarna lawn & garden equipment washer 532851074

Last updated: February 2026