Should you check the fluid level on drive axles with or without a trailer? I checked and it shows that it’s low with trailer. When I dolly off of it the level is fine. I would think you should check without the trailer. Does it matter?
Differential rear axle fluid level
Discussion in 'Ask An Owner Operator' started by Rob2isking, Sep 28, 2020.
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Huh? That's a new one on me.
The fluid level in the axle doesn't change according to load. The only way you're going to get a difference when measuring is if there is some rotation of the axle unloaded vs loaded... and I just can't imagine it would even be noticeable unless something is broken.
I'm guessing a more likely scenario is the two checks were done in different locations and one had a slight slope to it.
So, to answer your question: level ground, trailer or not shouldn't matter, but there's no trailer attached when the truck is built.Crude Truckin' and Socal Xpress Thank this. -
U checked last weekend. Had the trailer n load on. It was weekend and I’m off I grease n check things. Checked the rears Took plug out n stuck finger in n could feel barely at tip. So I added some to the plug level. Drove it all week. This time decided take trailer off cuz easier to get to. Took plug off and big stream started pouring out. Opposite of what I would’ve expected
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Like @not4hire said only way that could happen is if the axles had rotated so when you checked it with the trailer hooked up was the suspension air bags filled up?? If not they will rotate forward causing the pinion to drop and the oil level to be lower since the plug is now rotated higher then its normal position when the suspension is aired up.
not4hire Thanks this. -
Maybe you checked it when it was warm or hot versus cold
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AModelCat Thanks this.
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Flat, level ground. Suspension aired up and axles not under stress/torque is how I've always checked.
not4hire Thanks this. -
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