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170 hydraulic problem, strange.

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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=49424
Printed Date: 22 Aug 2025 at 1:23pm
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Topic: 170 hydraulic problem, strange.
Posted By: jmm
Subject: 170 hydraulic problem, strange.
Date Posted: 22 Apr 2012 at 4:17pm
So I have reaquired a 170.  I got it and the hydraulics did not work but the oil looked horrible.  I assumed the screen was plugged and it looked as if it was.  Fast-forward, the screen is clean, new oil, I start it up.  the pump wont pick up the oil. 
 
I remove the sump tube from the pump and blow into it.  I cannot blow very much air into it, asif the oil is being pushed back through the screen, that's ok but I hear a small air leak.  So I try and suck air and it happily burbles away. 
 
Am I left assuming that the suction line (looks bad) is bad? can it really only leak one way with out dripping oil?  Just seems weird.
AND are the suction lines available or do I need to make something?  thanks.
 
 



Replies:
Posted By: MACK
Date Posted: 22 Apr 2012 at 9:43pm
Most suction leaks will not leak oil. It is easier for the pump to suck air than oil so that is what it does. Make sure there is oil up to suction line. When it is drained it takes a while for oil to get to suction line.  MACK


Posted By: SteveM C/IL
Date Posted: 23 Apr 2012 at 10:16am
Need to remove /loosen an output line from the pump to help bleed air and suck up oil


Posted By: jmm
Date Posted: 23 Apr 2012 at 10:53pm
thanks, I did try to crack a pressure line and all I got was air.  So, I sheepishly disconected the sump line at the bottom and it was almost completely empty.  I've cleaned the screen above said suction line. 
 
But I think I have had a relavation.  I had been under the impression that the 170 had only one transmission oil resevoir.  Is the hex-headed breather in front of the shifter actually another dipstick?  I'll check tomorrow, but if that is the case, I'll feel pretty silly.
 
thanks.
John Mower


Posted By: MACK
Date Posted: 24 Apr 2012 at 7:32am
The hex head breather is where you fill the hydraulics. The trans ia  seperate from the hyd.  MACK



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