Oregon2023
New member
- Joined
- Feb 10, 2023
- Messages
- 15
- Tractor
- John Deere 855, 2520, 2040
I have a John Deere 2520 that I had to remove the charge pump and valve block to replace the transmission input driveshaft that couples to the engine due to the end of it breaking off after the tractor tunnel section cracked due to rolling over. I very carefully and cleanly reassembled the pumps back into the transmission housing using diagrams and lubricating with hydraulic oil. After reassembling the tractor and priming the hydraulic charge pump I’m not getting enough charge pump pressure to run the steering or feed the rest of the hydrostatic system. If I open the test port when turning it over oil gushes out. If I crack the steering pressure line I get nothing. I have disassembled, cleaned, inspected, and resealed everything 4 times now (including splitting the tractor) and it still comes down to no charge pump pressure. The tractor has just over 400 hours and the charge pump components measure within spec according to the John Deere service manual without any major visible wear. Everything was driving fine before disassembling. Any help beyond the obvious would be much appreciated.
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