Farm Equipment - 620 hydrostat oil change

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620 hydrostat oil change

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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=54805
Printed Date: 10 Sep 2025 at 10:42am
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Topic: 620 hydrostat oil change

Posted By: DSeries4
Subject: 620 hydrostat oil change
Date Posted: 05 Aug 2012 at 10:22pm

I am going to be changing the hydrostat oil in my 620 in coming days. After changing the filter and topping up with new fluid, will I need to prime it before it will be ready for use?

Thanks for the feedback!

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'49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '63 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080

Replies:

Posted By: D-17_Dave
Date Posted: 05 Aug 2012 at 10:36pm

There are priming instructions in the manual but the residual oil will likely prime it up and be good to go.

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Yea, I can fix that.....

Posted By: Gary
Date Posted: 06 Aug 2012 at 4:35am

Hey Myron

After you get yours done you can come over and do my Dad's 19-20H.

Gary

Posted By: DSeries4
Date Posted: 06 Aug 2012 at 9:08am

That's a tempting offer Gary, but I'll have to pass! I have it and a couple of other tractors to get ready for a show this weekend.

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'49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '63 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080