Craftsman 536773400 4-hp high wheel line trimmer Parts

No. For the Craftsman 536773400 4-hp high wheel line trimmer, we use 0.130-inch diameter trimmer line cut to 16.75 inches for proper fit and best cutting performance; .095 line is too thin for this model’s line retainer setup (it can slip, wear fast, and cut poorly). See the 536773400 owner's manual for the exact line specs and replacement steps.

The manual lists these specifications for the trimmer head:

Using a smaller diameter line than specified commonly causes:

• Line slipping in the retainer or pulling out while trimming
• Faster line breakage and shorter runtime per change
• Poorer cutting on thick weeds because the line flexes too much
• More vibration because the two line ends may not stay even

Follow the manual’s process and do these basics every time:

• Stop the engine and wait for all moving parts to stop
• Disconnect the spark plug wire before servicing
• Remove the worn line from the line retainer
• Thread the new 0.130 line through the outside loops, cross over the retainer, then feed through the center hole
• Make sure both ends are even before starting

This trimmer’s cutting head and line retainer are designed around a heavier-gauge line. Matching the 0.130-inch spec helps the line stay seated, last longer, and deliver the cutting power you expect from a 4-hp high wheel trimmer.

If you need to look up additional replacement items by model number, we list parts by model and category on the model page, and you can also search by model at Sears PartsDirect.

Last updated: February 2026

To replace the trimmer line on your Craftsman 536773400 4-hp high wheel line trimmer, stop the engine, disconnect the spark plug wire, remove the worn line, then thread a new 0.130-inch line cut to 16.75 inches through the outer loops and center hole so both ends are even (see the 536773400 owner's manual).

• Stop the engine and wait for all moving parts to stop.
• Disconnect the spark plug wire (prevents accidental starting).
• Pull the worn trimmer line out of the line retainer.
• Cut new line to the correct size: 0.130 inch diameter, 16.75 inches long.
• Thread both ends of the new line through the outside loops.
• Cross the line over the retainer and thread the ends through the center hole.
• Confirm both ends are even before trimming.

Using the correct diameter and length helps the trimmer head retain the line and improves trimming performance. Keeping nylon line moist prevents it from drying out and snapping, which reduces downtime and vibration.

We list replacement parts for the Craftsman 536773400 on the parts list for this model; you can also search by model number on Sears PartsDirect if you are looking for additional maintenance items.

Last updated: February 2026

For Craftsman model 536773400, use fresh unleaded gasoline in the fuel tank and fill the engine crankcase with SAE 30 motor oil to the FULL mark on the dipstick. The step-by-step fill procedure and safety notes are in the 536773400 owner's manual.

• Gasoline: Fresh, clean unleaded gasoline
• Engine oil: SAE 30 motor oil in the crankcase
• Oil level: Fill to the FULL line; do not overfill
• Fuel freshness: Replace old fuel; stale gasoline commonly causes hard starting and poor running
• Storage: For 30 days or more, run the engine until it runs out of gasoline or use fuel stabilizer

Even if your trimmer is described as “2-cycle 25cc,” the correct way to service Craftsman 536773400 is to:

• Put gasoline only in the fuel tank
• Put SAE 30 oil in the crankcase (separate oil fill cap/dipstick)

That separation matters because mixing 2-stroke oil into the gas on an engine designed for crankcase oil can cause poor running and heavy exhaust.

• Check oil on the dipstick; top off to FULL
• Tighten the oil fill cap/dipstick securely
• Fill the tank with fresh unleaded gasoline
• Run at FAST for best trimming performance
• Refuel outdoors; keep fuel away from sparks and flames

Correct gasoline and the proper crankcase oil level prevent overheating, reduce gum deposits in the fuel system during storage, and help the engine start and run consistently.

For parts diagrams and replacement items, search by model number on Sears PartsDirect.

Last updated: February 2026