Semi-Truck Transmission Fluid and Repair

July 28, 2020

The Rolling Rig

Keep a worry-free truck with these maintenance tips!

Whether you’re driving in a team from coast to coast or trailering locally around, knowing the basics of semi-truck transmission repair will keep your rig running smoothly and on time. Doesn’t matter if you’re using a semi-truck manual transmission or a semi-truck automatic transmission, maintaining proper fluid levels and knowing the signs of a problem before it becomes critical is essential. Read on with the International Used Truck Center specialists as we go over how to check semi-truck transmission fluid and some other semi truck maintenance tips to keep your rig road-ready.


How to Check Semi-Truck Transmission Fluid

Improper levels in your semi-truck manual transmission can mean serious damages and costs, incurred from both from replacement parts and labor and missed time on the road. A brief overview of how to check semi-truck transmission fluid levels follows:

  1. Make sure your truck is parked securely on a level surface.
  2. Your rig should be running while you check the levels, so use your parking brake.
  3. Pull out the transmission fluid dipstick. This should be located at the back of the engine near the firewall.
  4. Wipe it off, replace it, then pull it out again.
  5. Using the markings at the bottom of the dipstick, check the transmission fluid level.
  6. A low level should be addressed immediately with a transmission specialist.
  7. Consider also the color of the fluid. It should run clear pink/red. Darkness or sign of debris means it’s time for a filter change.

Take care to use the correct fluid semi-truck automatic transmission. Consult your operator’s manual or a certified technician for the proper specifications, especially if you notice any of the signs you might require semi-truck transmission repair.

Signs that You are in Need of Semi-Truck Transmission Repair

  • Leaking transmission fluid: This can be the cause of any number of the other issues listed below, so it is useful to maintain proper fluid levels and check for leaks.
  • Grating noise or squeal when the clutch is depressed: This likely means the pilot bearing or clutch release bearing is failing. If this noise persists when the clutch is released, the clutch release, disc, or torque tube bearings could need service.
  • Rough shifting: On a semi-truck manual transmission, this could be operator error, or it could mean something more serious. If noticed on a semi-truck automatic transmission, faulty sensors or the throttle cable could also be the cause.

If you’re experiencing any of the above issues and aren’t sure of the root cause, be sure to have it checked by a professional. Note that semi-truck maintenance in summer and winter can affect fluid levels to some degree, as can other factors such as air pressure and elevation.

Keep Your Rig Running Smoothly with International Used Truck Center

Whether you want replacement parts or the best information on semi-truck transmission repair near you, International Used Truck Center has all the information. As you trailer around and beyond, we have more expert tips on brake maintenance and more you can access any time, anywhere, and you can always contact us today to get the latest on your workhorse.

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International Used Truck Center 41.776180, -88.200918.