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Discussion Forum

Case 646

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Author  [Modern View]

03-04-2009 15:32:28

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I recently purchased a Case 646.

It had a worn hydraulic pump that needed replacement.

I have gotten confusing information on the proper oil for replacement.

Can anyone help?

I am considering using tractor hydraulic oil. The local tractor dealer says that is suitable for all Case tractors.



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Tom Arnold

03-07-2009 08:19:32

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 Re: Case 646 in reply to guyralph, 03-04-2009 15:32:28  
Your local tractor dealer is apparently not familiar with Case garden tractors and his recommendation would have landed you in trouble.

Ken Combs is correct in telling you to use only motor oil in the hydraulic system of your 600 series Case. And this advice holds true for all the GT's with Hy-Drive produced by Colt, Case or Ingersoll.

While oils blended for diesel engines are an excellent choice, I prefer any high quality 20W50 or straight 30W for the best performance from these tractors. If you are in doubt about what's in your tractor for oil right now, then drain all hydraulic cylinders along with the reservoir before installing the new oil.

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Ken Combs

03-05-2009 12:34:54

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 Re: Case 646 in reply to guyralph, 03-04-2009 15:32:28  
Use only motor oil, not hyd fluid. Case (now Ingersoll) recommends 20-40 but 15-40, 15-50, or 20-50 work well. Diesel rated oils are preferred as they have a large dose of anti-foaming additive.

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03-05-2009 08:28:57

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 Re: Case 646 in reply to guyralph, 03-04-2009 15:32:28  
I don't believe that you should use Hydraulic fluid. I have a 446 and the oil used in the hydraulic system is a regular motor oil (I believe that it is staight 20w). Granted, I don't have a loader but I believe that the system is the same.

Anyway, the point of my post is to wait until you hear from someone here that knows. You may want to search some previous posts, as I know that this was discussed in the past.

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