CA Hydraulic Pump Prime Loss
Printed From: Unofficial Allis
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=212256
Printed Date: 16 Sep 2026 at 5:14pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: CA Hydraulic Pump Prime Loss
Posted By: dfwallis
Subject: CA Hydraulic Pump Prime Loss
Date Posted: 16 Sep 2026 at 3:55pm
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I know that the system has thicker oil than specified (30wt vs 20wt), because the NAPA guy didn't give me what I asked for when I backed the truck up to the dock. It is just a little slow to prime and sometimes loses prime when in hold or down (it's a 1952 and doesn't have the inlet check ball that some possibly later ones had). It also has a leak around the plug at the top rear of the pump. I think either the rebuilder didn't include the crush washer or it needs a new one. I'll try to fix that next trip. Could a leak at that plug contribute to loss of prime (it doesn't squirt but is a fairly constant dribble under pressure)? I've mostly resolved the cylinder leaks. After the first of the year, I'll probably change out all the fluids and correct the viscosity issue. ------------- 1952 CA13092, CA Pickup Plow, CA Cultivator, CA Two Row Planter, Dunham-Lehr GC78 Disc, Grader Blade, 3pt Fm180 Finish Mower |
Replies:
Posted By: steve(ill)
Date Posted: 16 Sep 2026 at 4:23pm
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any air inlet leakage can cause a loss of prime over time.. Make sure the oil level is UP TO MAX also... I have a B that i run an inch over the level mark to keep the pump primed when i travel DOWN steep hills........ i added a 45 degree elbow to the fill port and fill to that top instead of the threads in the trans case.. ------------- Like them all, but love the "B"s. |
Posted By: dfwallis
Date Posted: 16 Sep 2026 at 4:47pm
I topped it off last trip and it improved slightly. It was only about a 1/2 cup low though. ------------- 1952 CA13092, CA Pickup Plow, CA Cultivator, CA Two Row Planter, Dunham-Lehr GC78 Disc, Grader Blade, 3pt Fm180 Finish Mower |
steve(ill) wrote: