ATF vs Hydraulic Fluid in D17 s4?
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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=164652
Printed Date: 27 Jul 2025 at 1:43pm
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Topic: ATF vs Hydraulic Fluid in D17 s4?
Posted By: JBergie
Subject: ATF vs Hydraulic Fluid in D17 s4?
Date Posted: 27 Sep 2019 at 8:26pm
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I'm sure this is a question that's been covered before but I couldn't find it off the bat. My D17 s4 has a pto leak and before I fix it, I need to use it! So I thought I'd top off the fluid, but am not 100% sure if best to use ATF or hydraulic. Pros and cons to each. (Isn't the reservoir shared?) Thoughts? ------------- D17 Series IV |
Replies:
Posted By: MACK
Date Posted: 27 Sep 2019 at 8:34pm
| Universal hydraulic. MACK |
Posted By: Joe(TX)
Date Posted: 27 Sep 2019 at 9:12pm
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ATF is too thin. Use hydraulic fluid ------------- 1970 190XT, 1973 200, 1962 D-19 Diesel, 1979 7010, 1957 WD45, 1950 WD, 1961 D17, Speed Patrol, D14, All crop 66 big bin, 180 diesel, 1970 170 diesel, FP80 forklift. Gleaner A |
Posted By: Clay
Date Posted: 27 Sep 2019 at 9:16pm
| Make sure it has the 821 specification. |
Posted By: steve(ill)
Date Posted: 27 Sep 2019 at 10:21pm
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821 spec is nice, but not a requirement for a D series........... any economy UTF is OK. ------------- Like them all, but love the "B"s. |
Posted By: WF owner
Date Posted: 28 Sep 2019 at 7:45pm
I was under the impression that the D-17 Series IV had basically the same hydraulic system as the 170 and did require the 821 spec oil. Am I wrong? |
steve(ill) wrote:Posted By: Clay
Date Posted: 28 Sep 2019 at 8:34pm
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You are not wrong WF. |
Posted By: DanD
Date Posted: 29 Sep 2019 at 8:04pm
| Is it leaking out the rear around the PTO? If so, that reservoir is not shared with the hydraulics. The Power director and hydraulics share oil but the trans and rear end is separate. Having said that you should fill both reservoirs with 821 oil. |
Posted By: Mosin9130
Date Posted: 29 Sep 2019 at 8:37pm
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Thread discussion is perfect as I’m about to change fluids on my D17 IV but I wanted to verify a couple of things. Per the operators manual: Power director and hydraulics - type A auto trans fluid Transmission and rear gears - SAE 80 transmission fluid Considering the quality of modern day fluids, the appropriate fluid to replace BOTH is universal hydraulic fluid (821 spec)? ------------- '56 WD 45...'63 D15 II...'66 D17 IV |