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Plow Leaving Streaks or a Ridge: A Field Troubleshooting Table by Symptom

Why is the plow leaving a streak or a ridge behind it?

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Illustration for snow plow leaving streaks: a plow truck, a regional map with a pin and a gear
Published October 27, 2026 Updated November 8, 2026 4 min read Topic Setup Symptoms
4 answersAsked 27 October 2026·Troubleshooting & Wear in Service

SENTHAI Editorial Team

TALK / FIELD TROUBLESHOOTING DISCUSSION
Buyer question

Our plow keeps leaving a thin streak or a ridge of snow behind it and the driver cannot tell why. Where should we look first, and how do we narrow it down?

Main answerSENTHAI Editorial Team

Main answer

Short answer
Look at where the streak is and what it looks like, and the pattern usually points to one of a short list of causes: a chipped or worn spot on the edge, a bent moldboard, a high shoe on one side, wrong tilt or too much speed. The table below is a field aid; confirm by inspection.

Troubleshooting table

What you see Likely cause What to check Fix
Thin streak in one fixed place Chip or low spot in the edge Look along the edge for a gap, then check whether carbide is missing Replace or repair the edge section
Ridge along the full length of one side One end set high or worn unevenly Compare both skid shoes and both edge ends Adjust shoes, replace worn parts
Ridge in the middle Bowed moldboard or edge Sight along the edge with a straight bar Straighten or replace
Streaks that come and go Speed or float problem Ask the driver about speed and down pressure Adjust technique and settings
Wide ridge on one side only Tilt or truck lean Check tyre pressure, frame level and tilt Level the setup
Fresh streaks after a hard hit Bent edge or loose bolts Check bolts and the edge for movement Re-torque or replace

How to run the check

A streak or a ridge is a geometry symptom, so the first checks are the cheapest ones.

  1. Park on flat ground and clean the plow.
  2. Lower the blade onto a flat surface and look at the gap under the edge.
  3. Put a straightedge along the cutting edge and look for low spots.
  4. Compare shoes, ends and frame level.
  5. Change one thing at a time and test again.

Limits

Snow type and surface also affect the pass. Wet snow and packed ice leave different marks than dry powder, so repeat the test in the same conditions.

When to stop and ask for help

If you cannot find a cause after one pass through the table, or if you see cracks in the moldboard or frame, take the plow out of service and ask the maker or a qualified shop. Cracks and bending can affect safety, and guesswork is not a fix.

Boundary: The table is a field aid based on general shop practice and not a diagnosis; snow type, surface and speed also affect results.

Further reading on this site.

A blade scrapes well at first and leaves more snow later in the shift. What should the log capture? ↗The new blade lasts longer but leaves more cleanup work. How should the trial account for that? ↗Carbide snow plow blades ↗Snow Pusher Edges: Rubber, Steel or Wear-Strip for Lots and Docks ↗Edge Catching on Joints and Seams: Reading the Gouge Marks ↗Why a Plow Blade Chatters on Cold Pavement: Five Causes in the Order to Check Them ↗

Field-check perspective

Reply

↳ Replying to SENTHAI Editorial Team

Do the check in the yard before blaming the road. A flat surface and a straight bar show chips and bowing quickly. Take a photograph of the gap under the edge, then compare after any adjustment. Drivers learn a lot by seeing the gap themselves, not only by being told. Photograph the gap before and after each adjustment so the effect can be seen.

Maintenance perspective

Reply

↳ Replying to Field-check perspective

If the streak follows one part of the edge, replace or rotate that section. If both ends differ, look at the shoes first, since they set the angle. Log the finding and the fix so the next time the same symptom appears, the answer is faster and the record is clear. Keep a short log of symptoms and fixes for each truck; patterns appear after a few entries.

Selection perspective

Reply

↳ Replying to Maintenance perspective

Repeated streaks despite good setup can mean the edge profile does not suit the surface or snow. Ask whether a different profile or a segmented edge would help, and trial it on one truck. Change one factor at a time so you know which change worked. Compare notes with other depots running similar equipment before you decide on a change.

Next step

Question: why is the plow leaving a streak or a ridge behind it?

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