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Old 10-22-2017, 03:15 PM   #1
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Velvet Drive

When do you check the fluid in the transmission, when the unit is cold or after running and hot.
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Old 10-22-2017, 03:34 PM   #2
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Old 10-22-2017, 03:42 PM   #3
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http://www.trawlerforum.com/forums/s...ion-35105.html

See the above thread, it was just discussed a few days ago and will answer your question and some you haven't thought of asking.
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Old 10-22-2017, 07:21 PM   #4
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Originally Posted by jleonard View Post
http://www.trawlerforum.com/forums/s...ion-35105.html
See the above thread, it was just discussed a few days ago and will answer your question and some you haven't thought of asking.
Prior thread is full of good info.

In practice, I check my fluids before starting so everything is cold.
You can take a file and put min/max marks on the dip stick if needed.
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Old 10-25-2017, 12:51 PM   #5
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Originally Posted by kartracer View Post
When do you check the fluid in the transmission, when the unit is cold or after running and hot.
There is a Velvet Drive operators manual in this Forums Library (Tab in the upper right corner of this page, manuals, page 2) which you can download and carry with you for your reference. Be sure and read page 13 in the manual about oil bleed down from the oil cooler.
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Old 10-25-2017, 01:12 PM   #6
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http://www.hyvair.com/pdf/hydraulicfluid.pdf

Looks to be around a 4 to 5% volume change over 100 degrees. So, for a simple rectangular container, that would be a 5% increase from the bottom of the pan (not the end of the dipstick).
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Old 10-25-2017, 02:29 PM   #7
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Originally Posted by Edelweiss View Post
There is a Velvet Drive operators manual in this Forums Library (Tab in the upper right corner of this page, manuals, page 2) which you can download and carry with you for your reference. Be sure and read page 13 in the manual about oil bleed down from the oil cooler.
Thanks for the reminder. That’s a good manual.
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Old 10-25-2017, 02:54 PM   #8
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Originally Posted by diver dave View Post
http://www.hyvair.com/pdf/hydraulicfluid.pdf

Looks to be around a 4 to 5% volume change over 100 degrees. So, for a simple rectangular container, that would be a 5% increase from the bottom of the pan (not the end of the dipstick).
Wouldn't it be closer to 10%? 4 quarts in transmission and reduction gear, with temp rising from 70F to 190F (temp range is 140-190)
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Old 10-25-2017, 03:09 PM   #9
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I'm using a hydraulic fluid coefficient of volume change per degree figure of 0.0005 / deg.

Moved the decimal over two places (100 deg delta) to get .05. Convert to %, two more decimals. Now its 5% total volume change over temperature. Still not a dipstick change yet. I assumed a straight wall volume, so a 5% change in volume must equal a 5% change in height. A few assumptions made in there, but should be fairly close to a BW VD. Also, my VD never got too hot to place a hand on it.
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