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Old 09-12-2010, 08:14 PM   #1
etc02
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Default X728 Hydraulic fluid

What is the proper way to check the transmission fluid? The way I read the OM, the dipstick should sit on top of the fill tube, without turning it at all, to measure the level.

Is this correct? Do I check with the trans hot or cold?

I just got it back from the dealer after having a 3PH installed, and it was at least a half court low
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Old 09-12-2010, 08:49 PM   #2
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Default Re: X728 Hydraulic fluid

Check it cold, with the dipstick on top of the tube.
Mine was low also after I has the rear PTO installed.
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Old 09-12-2010, 09:08 PM   #3
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Default Re: X728 Hydraulic fluid

On flat ground with a cold transmission, unscrew the dipstick and wipe it off. Then rest it on top of the fill tube, pull it and check the level. It's a bit difficult to see.
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Old 09-12-2010, 09:33 PM   #4
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Default Re: X728 Hydraulic fluid

Thank you Andy and Brett
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Old 09-13-2010, 05:31 AM   #5
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Default Re: X728 Hydraulic fluid

Quote:
Originally Posted by Brett-JDX748 View Post
On flat ground with a cold transmission, unscrew the dipstick and wipe it off. Then rest it on top of the fill tube, pull it and check the level. It's a bit difficult to see.
Next to impossible to see, whipe the stick with chalk, something a service guy told me a year ago.....I use the same method as Brett and both were low a few hours after delivery, could have been they were not topped up after the PTO's were installed but in my case it effected the AWS and tore up some sod
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Old 09-13-2010, 06:07 AM   #6
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Default Re: X728 Hydraulic fluid

Mine was low as well Andy.
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Old 09-13-2010, 09:13 AM   #7
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Default Re: X728 Hydraulic fluid

Not sure if this is a statistically significant sample, but, mine too was low from dealer on delivery. At the 50 hour drain and replace, I went to my dealer and asked for a new filter and 3 gallons and two quarts of HyGard. The parts counter guy wondered at such a large purchase of hydro and looked at his book and showed me it should only need six or seven quarts. I walked him over to the x728 on the display floor and opened the hood and showed him the capacity on the large decal under the hood. His response, "I guess I must have an old book".

Anyway, it appears my x728 was probably filled with 13 quarts on delivery rather than 13.5 quarts. It's filled right now.

And, fwiw, I agree with all the responses above on how to check it.

Good luck,
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Old 09-13-2010, 10:06 AM   #8
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Default Re: X728 Hydraulic fluid

I think the capacity difference (~8 quarts vs. ~13 quarts) is from the change in frontends. My older 2007 has a shaft driven geared frontend that used gear oil. Newer (is it 2009 and later?) frontends are hydraulic drive units that share the same hydro fluid as the rearend and have a greater capacity need.
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Old 09-13-2010, 01:27 PM   #9
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Default Re: X728 Hydraulic fluid

Quote:
Originally Posted by POENY View Post
I think the capacity difference (~8 quarts vs. ~13 quarts) is from the change in frontends. My older 2007 has a shaft driven geared frontend that used gear oil. Newer (is it 2009 and later?) frontends are hydraulic drive units that share the same hydro fluid as the rearend and have a greater capacity need.
I'm sure you are right. I found it odd that the JD dealer who knows me, and has all 30+ years of records of what I've bought and traded there, can look me up, but used an old capacities book laying on his counter to quote me an amount. My x728 is either a 2009 or 2010, I bought it last November.

Thanks
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Old 09-13-2010, 02:54 PM   #10
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Default Re: X728 Hydraulic fluid

Quote:
Originally Posted by picframer View Post
Next to impossible to see, whipe the stick with chalk, something a service guy told me a year ago.....I use the same method as Brett and both were low a few hours after delivery, could have been they were not topped up after the PTO's were installed but in my case it effected the AWS and tore up some sod

Can you tell me more about wiping the dipstip with chalk. Do you put a line of chalk on the dipstick and then check the fluid level? I know the amount is minimal, but any concern with calcium carbonate (aka rock) in your hydraulic fluid??
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Old 09-13-2010, 06:23 PM   #11
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Default Re: X728 Hydraulic fluid

After my 50 hour fluid change, I drove the tractor for several minutes after checking the fluid and the level was OK. I checked it again after mowing for over two hours and it was low. It must take a while for all of the air to work out of the system. My tractor had .4 hours on it when it was delivered, that might not be enough for the fluid level to stabilize.
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