warren woodrow
Member
I am posting only because it may help someone i the future . Several weeks ago I solicited forum help with my 424 hydraulic pump . The pump number is on the pump and is a Thompson . The main issue is that the schematics/ diagrams provided by IH did not match the actual parts in the pump . The parts which were different were the spring and ball check valve mechanism .The diagrams all show a spring which pushes on a ball . My pump actually had a spring with a hook end which pulls on a disc . I searched the internet diligently for info and found one thread from years ago on this forum whereby someone ran into a similar issue . Like me, that poster thought he must have somehow lost the ball bearing. In reality , there is no ball bearing in the pump .
After much frustration I decided to order the kit from Steiner which matched my pump number . The kit arrived and contained the correct seal, gaskets , and two of the four o rings were correct . I was able to find two other o rings from a different source which would fit. I subsequently rebuilt the pump . By " rebuild " I simply mean that I replaced the seal, o rings, and gasket but did NOT do any machine work to the very worn pump parts . The result is that the pump problems are fixed FOR NOW. The original issue was that hydraulic fluid was leaking past the seal and into the crank case. I did not use a speed sleeve on the shaft but rather just did not slide the seal all the way back over the worn part of the shaft . I DID use an adhesive to lock the outer metal part of the seal into the housing . I have no idea how long this pump will work as it was very worn . I only use the tractor a very few hours annually and hopefully saved a few dollars versus spending $ 700 on a new pump for a tractor I use 20 hours per year . Moral of the story is the parts diagrams are not always accurate .
After much frustration I decided to order the kit from Steiner which matched my pump number . The kit arrived and contained the correct seal, gaskets , and two of the four o rings were correct . I was able to find two other o rings from a different source which would fit. I subsequently rebuilt the pump . By " rebuild " I simply mean that I replaced the seal, o rings, and gasket but did NOT do any machine work to the very worn pump parts . The result is that the pump problems are fixed FOR NOW. The original issue was that hydraulic fluid was leaking past the seal and into the crank case. I did not use a speed sleeve on the shaft but rather just did not slide the seal all the way back over the worn part of the shaft . I DID use an adhesive to lock the outer metal part of the seal into the housing . I have no idea how long this pump will work as it was very worn . I only use the tractor a very few hours annually and hopefully saved a few dollars versus spending $ 700 on a new pump for a tractor I use 20 hours per year . Moral of the story is the parts diagrams are not always accurate .
