Owner’s manual
How to replace trimmer line on Craftsman Weedwacker?
To replace the trimmer line on your Craftsman 358745350 electric line trimmer, remove the old line, clean the cutting head, then feed a new piece of 0.080 inch (2 mm) line through the correct hole pattern so both ends come out equal length. See the owner's manual for the exact hole locations and routing.
Steps to replace the line (fixed-line head)
- Unplug the trimmer before servicing the cutting head.
- Pull out and discard the old line.
- Wipe debris off the cutting head and locate the three-hole pattern on the line glide plate.
- Insert both ends of a new line through the proper holes on the side of the cutting head.
- Pull each end until the line seats against the hub and runs fully through the positioning tunnels.
- Confirm both line ends are the same length before you start trimming.
Correct line size and what not to use
Use the specified line size to keep the head feeding and cutting correctly.
| Item | What to use | Why it matters |
|---|---|---|
| Line diameter | 0.080 inch (2 mm) | Prevents poor cutting and head damage |
| Line material | Craftsman trimmer line | Designed for safe, stable cutting |
| Do not use | Wire, rope, string | Can break and become a thrown hazard |
If the head will not cut well after restringing
These checks fix most “it spins but won’t trim” complaints.
- Make sure the line is routed through the correct holes (not crossed).
- Make sure the line is fully seated in the positioning tunnels.
- Keep only the tip of the line contacting grass; do not force the head into the work.
- Inspect the debris shield and cutting head for cracks or missing pieces.
Why it matters
Correctly installed 0.080 inch line keeps the cutting head balanced, protects the hub and tunnels from damage, and reduces vibration while trimming, edging, or mowing.
Last updated: February 2026
What size line for Craftsman trimmer?
For the Craftsman electric line trimmer model 358745350, we use 0.080 inch (2 mm) diameter nylon trimmer line. Using a different diameter can cause poor cutting performance, line welding, or cutting head problems; the correct size is listed in the owner's manual.
Recommended line size and what to avoid
- Correct line diameter: 0.080 inch (2 mm)
- Material: nylon trimmer line only
- Do not use: wire, string, rope, or any non-nylon substitute
- Do not oversize: thicker line can overload the head and feed path
- Do not undersize: thinner line can break too easily and cut poorly
Quick fit check
If you are buying line and want to confirm it will work in your 358745350 trimmer, use this checklist:
| Check | What you want | Why it matters |
|---|---|---|
| Diameter | 0.080 in (2 mm) | Ensures proper cutting head function |
| Material | Nylon trimmer line | Prevents dangerous breakage and head damage |
| Condition | Smooth, not brittle | Reduces snapping and “welding” in the head |
How to replace the line (basic steps)
We follow the same process outlined for this model:
- Remove the old line from the cutting head.
- Clean the cutting head surface so debris does not bind the line.
- Locate the three-hole pattern on the head/line glide plate.
- Insert both ends of the new line through the correct holes.
- Pull both ends until they are seated against the hub and equal length.
Why it matters
This trimmer is designed around a specific line diameter. When the line is too large or routed incorrectly, it can jam, wear the head faster, and cause the line to weld onto the cutting head during use.
Last updated: February 2026
Where is the model number on a Craftsman Weedwacker?
On a Craftsman electric line trimmer like model 358745350, the model number is printed on the unit’s rating/ID label (often on the motor housing, handle area, or along the shaft). Use the number from the label on the trimmer itself for the most accurate parts match; see the 358745350 owner's manual.
Where to look on the trimmer
Check these common label locations first:
- On the motor housing (near the air vents or rear of the housing)
- On the handle or trigger switch area
- Along the shaft/tube (often on the upper tube)
- Near the debris shield mounting area
- On a sticker or plate that also lists electrical information (amps/volts)
What the label usually shows (and why it matters)
The ID label typically includes the model number and other details that help us match the correct Craftsman parts list.
| Label item | What it’s used for | Example for this unit |
|---|---|---|
| Model number | Ensures correct diagrams and parts | 358.745350 (often shown as 358745350 online) |
| Electrical rating | Helps troubleshoot power issues safely | 4.6 amp motor (from the manual) |
| Serial/date code | Helps identify production run | Varies by unit |
Tips to avoid ordering the wrong part
Using the exact model number from the trimmer prevents mismatches, especially for electrical parts like switches.
- Write the model number exactly as shown on the label
- Ignore partial numbers printed on packaging or generic paperwork
- If the label is worn, clean it gently with a damp cloth and mild detergent
- Match the model number to the parts list before ordering
- For a no-start issue, confirm the trigger action and consider the line trimmer on/off switch 530402879 if the switch is faulty
Why it matters
Craftsman trimmers can look similar across model families, but small differences in the tube assembly, wiring, and switch style change which replacement parts fit. The model number on the unit is the fastest way to get the right diagrams and parts the first time.
Last updated: February 2026
