Craftsman 917776741 gas line trimmer Parts

To replace trimmer line on your Craftsman 917776741 gas line trimmer, we disconnect the spark plug wire first, remove the worn line from the carrier plate, then cut and install new line using the debris shield marks so both sides end up the same length (18-3/4 inches per line).

Steps to replace the trimmer line

• Disconnect the spark plug wire and keep it away from the plug (prevents accidental starting).
• Remove the worn trimmer line from the carrier plate.
• Measure and cut new line using the built-in length gauge on the debris shield:
  • Start at the debris shield mark.
  • Wrap the line around the front of the chassis cover.
  • Cut at the “22” mark (cutting width reference).
• Fold the cut line in half.
• Insert the folded end through the carrier plate opening to the back side of the retainer clip.
• Pull outward until the line is fully seated under the retainer clip.
• Repeat for the other side; confirm both lines match in length.

Correct line size and length

The 917776741 uses .155 diameter trimmer line. Replace the line when it is worn to less than half its original length.

Item	What to use	What to check
Line diameter	.155 in	Too small can slip; too large may not seat
Line length (each)	18-3/4 in	Both sides must match
Final check	Equal lengths	Reduces vibration and improves cut

If the head will not retain the line

These are the most common causes and fixes:

• Line not seated under the retainer clip: reinstall and pull until fully seated.
• Lines are uneven: recut and reinstall so both sides match.
• Wrong diameter line: switch to .155 diameter.
• Retainer clip is broken: replace the carrier plate.

Helpful part reference: line trimmer carrier plate 594935003

Why it matters

Correct line length and diameter help the trimmer cut efficiently, reduce excessive vibration, and prevent premature wear on the trimmer head and mow ball when trimming near hard surfaces.

For diagrams and the exact procedure wording for your unit, use the 917776741 owner's manual.

Last updated: February 2026

For the Craftsman gas line trimmer model 917776741, the thickest specified trimmer line is 0.155 inch diameter (about 3.9 mm). This model uses pre-cut 18-3/4 inch lengths; using thicker line can overload the cutting system and reduce performance (see the 917776741 owner's manual).

What this model is designed to use

Our documentation for model 917776741 lists the correct line as 0.155 diameter x 18.75 long. If you buy bulk line, cut it to 18-3/4 inches before installing.

• Use only the specified trimmer line material (not wire, rope, or string)
• Cut bulk line to 18-3/4 in before use
• Keep both cutting lines the same length
• Install the line through the carrier plate and under the retainer clip
• Disconnect the spark plug wire before servicing the cutting head

Quick size guide (common trimmer line ranges)

These ranges help when you are comparing products on the shelf; for this Craftsman unit, match the spec above.

Trimmer type	Typical line diameter	Notes
Light-duty electric/battery	0.065 to 0.080 in (1.7 to 2.0 mm)	Best for grass and light weeds
General homeowner gas	0.080 to 0.105 in (2.0 to 2.7 mm)	Mixed trimming
Heavy-duty/high-wheel style (like 917776741)	0.155 in (3.9 mm)	Handles thicker weeds; uses pre-cut lengths

Why it matters

Line diameter affects cutting power and engine load. On model 917776741, going thicker than 0.155 in can strain the drive system and reduce cutting speed; going thinner can break more often and cut poorly.

Related part you may need

If you want the factory-specified line for this unit, look for the pre-cut line bundle listed for the model: line.bund.18 580412601.

Last updated: February 2026

For the Craftsman gas line trimmer model 917776741, the fuel line size depends on whether you are replacing the small supply/return line or a larger vent line; most Craftsman trimmers use a small line around 9/64-inch OD with about 0.080-inch ID. Confirm the exact routing and connection points in the 917776741 owner's manual.

How to confirm the correct fuel line size on model 917776741

We recommend matching the new hose to the old hose and the fittings on the fuel tank and carburetor so it seals tightly and does not leak.

• Remove the air filter cover so you can see the carburetor fuel nipples.
• Check whether your trimmer uses one line (fuel supply only) or two lines (supply and return).
• Measure the inside diameter (ID) of the old line; ID is what determines the seal on the fitting.
• Measure the outside diameter (OD) to ensure it passes through the tank grommet (if equipped).
• Replace any hardened grommet or cracked primer bulb at the same time (common leak sources).

Typical fuel line sizes you will see (quick reference)

These are common small-engine fuel hose sizes used on many Craftsman trimmers; use them as a starting point, then match to your fittings.

Fuel line use	Typical OD	Typical ID	Notes
Small supply/return line	9/64 in	0.080 in	Common for small tank and carb fittings
Medium line (varies by setup)	3/16 in	1/8 in	Used when fittings are larger

Why it matters

Using the wrong ID can cause air leaks (hard starting, surging) or fuel leaks (strong fuel smell, wet tank area). A snug-fitting line keeps the carburetor fed with steady fuel flow.

Related parts you might replace during a fuel system refresh

These parts are not fuel hoses, but they are commonly serviced on the same Craftsman 917776741 trimmer when you are already doing maintenance:

• Husqvarna line trimmer cutting head control cable 584954101 (if the control feels sticky or does not return smoothly)
• Line trimmer return spring 532173811 (if the control does not snap back)

Last updated: February 2026