How to Change Differential Oil on a Yamaha Grizzly

You should change the front differential and the final drive fluids in your Yamaha Grizzly every 3,200 miles or once a year. 

A rule of thumb is to change these fluids every time you do your regular your oil changes so that it's easy to keep track. Changing the drive gear fluids on your Grizzly can save you a ton of drivetrain woes. Here's how to do this simple maintenance task for your Yamaha ATV. 

Tools and Parts Needed - Yamaha Grizzly Differential Oil Change


  • Torque wrench
  • 3/8th ratchet
  • Extensions 
  • Swivel for ratchet and sockets
  • 21mm socket
  • 5mm, 6mm Allen

Yamaha Grizzly Front Diff Fluid Change

Step 1. Locate the 21mm fill nut near the top of the front differential. It's #23 in our Yamaha Grizzly YFM700 front differential diagram. Remove it using a ratchet (and a swivel if necessary). Be careful not to lose the fill plug gasket

Yamaga Grizzly front differential oil change

Step 2. Get a drain pan underneath your ATV and look for the cutout that's located slightly off-center. The plug is #17 on our YFM700 front diff diagram. Remove it using a 5mm Allen to drain the fluid out of the front differential. This plug also has a gasket, so be careful not to lose it.  

Yamaha Grizzly front diff oil change

Step 3. Look at the fluid's color and consistency as it's draining. If it's anything other than a brown color, you may have a leak. Milky looking transmission fluid indicates water intrusion, and is a symptom of a bad seal in the transmission. 

Step 4. Replace the drain plug and its gasket once the fluid has drained out. Just get it snug, then use a torque wrench to tighten it to 7 foot-pounds.

Step 5. Use your hand pump to refill with gear oil. Run the tube from your hand pump straight into the fill opening. We're using an 80-weight GL4 hypoid oil from Kawasaki. It won't hold much, maybe a quarter of a quart, so just keep filling until it starts to run out. 

Yamaha Grizzly YFM700 final drive fluid change

Step 6. Replace the fill bolt once it's full. Use your 21mm socket and a torque wrench to tighten it to 17 foot-pounds. 

Yamaha Grizzly front diff oil replacement

Yamaha Grizzly Final Drive Fluid Change

Step 1. Remove the fill plug. It's a 21mm bolt located at the rear of the housing, and it's #26 in our Yamaha Grizzly drive shaft diagram. This bolt will have a fill plug gasket, just like up front. Don't lose it. 

Step 2. Look for an opening in the skid plate underneath your Grizzly, which allows you to access the drain bolt. The bolt is #25 on our Yamaha Grizzly drive shaft diagram. Get a drain pan underneath it and remove it with a 6mm Allen. This bolt also has a gasket. Once again, the presence of a milky fluid indicates water intrusion. 

Yamaha YFM700 Grizzly final drive fluid change

Step 3. Replace the drain bolt and gasket once it's drained. The torque is 7 foot-pounds.

Step 4. Before refilling, remove the check bolt on the final drive housing to help you fill to the correct level. It's located on the right side of the housing.

Yamaha Grizzly  final drive fluid replacement

Step 5. At the fill bolt/plug opening, use your hand pump to begin pumping in gear oil. You'll know that you've gotten the level correct when you start to see overflow from the check bolt opening. 

Yamaha Grizzly final drive fluid change

Yamaha Grizzly YFM700 final drive fluid replacement

Step 6. Replace the check bolt and torque it to 7 foot-pounds. Replace the fill plug, torque it to 17 foot-pounds and you're done!

As mentioned, your Grizzly's gear drive service should be done with every oil change. Watch the video below to see how to do the oil change for a Yamaha Grizzly YFM700.



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