Troubleshoot Hydraulic Pump AC G
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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=55362
Printed Date: 09 Sep 2025 at 5:49pm
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Topic: Troubleshoot Hydraulic Pump AC G
Posted By: surferbueno
Subject: Troubleshoot Hydraulic Pump AC G
Date Posted: 16 Aug 2012 at 5:40pm
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Hi AC enthusiasts, I've got an AC G that has non-functioning power front hydraulics. I'm working on troubleshooting the issue and I need some advice. The system appears to be complete but I cannot get a response from the controls. I have engaged the hydraulic/pulley system with the shifter lever on the housing. The pulley is running. I have moved the valve lever on the control valve (on the pump body) back and forth with no effect. I have disconnected the hydraulic line from the pump body with no fluid coming either from the line or the pump. I have removed the plug towards the exterior of the pump body, the one with a long pin and spring that supposedly holds a ball in the pump body. Even with the plug and pin out I get no response by moving the valve lever back and forth. Would any experienced G owners be able to advise me in the next steps to take to possibly free up the ball in the pump body? Or is there something else I can try to get the pump to move fluid? Thanks in advance for any help you can provide, |
Replies:
Posted By: CTuckerNWIL
Date Posted: 16 Aug 2012 at 6:11pm
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Is there fluid in the system?
------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: surferbueno
Date Posted: 17 Aug 2012 at 4:58am
| Yes, the oil is right below the level of the main plug. It looks clean and topped-off. Besides the hydraulic system the tractor is running fine. |
Posted By: Dave Richards (WV)
Date Posted: 17 Aug 2012 at 8:39am
| I am afraid it is time to inspect the suction tube. Might be plugged, might have hole allowing air to enter. |
Posted By: Bill Long
Date Posted: 17 Aug 2012 at 10:11am
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Very stupid thought. Do you have the right oil in the transmission. The manual calls for 20 NON DETERGENT oil but I have heard some very good reports on trans hyd (?) oil. Did it work before? If it did there may be - as said above - air bleeding in and losing prime or a plugged intake tube - simple. If that is not the case then you have to get more detailed. In Fact, Dave just posted a G hyd manual. Ask him if he will send it to you so you can see what you will be working on. Good Luck! Bill Long ps: You know, this is the first mention of a non-working G hyd I remember hearing. |
Posted By: surferbueno
Date Posted: 17 Aug 2012 at 10:16am
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Hi Bill, I believe that the tractor only has engine oil as the hydraulic fluid. It all runs out of one reservoir. Maybe other G's were made differently. |
Posted By: Scott(GA)
Date Posted: 18 Aug 2012 at 8:24pm
Transmission oil perhaps?
Best regards,
Scott
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surferbueno wrote: