Posted by pete 23 on April 04, 2013 at 10:26:04 from (74.47.40.242):
In Reply to: Farmall 400 hydraulics posted by T.R. Dickinson on April 03, 2013 at 18:32:38:
The orfice with screen is in the regulator valve block. The original size of the orfice was .024. The co. increased that size to .031 on the 560's and then used it in all tractors. Drilling it out may not do anything for a continuous noise in neutral, but if it is burping off and on pressure it should help. Always a good idea to at least make sure the screen is in good shape and clean as they collapse. If it is not broken, you can cut end of screen off to clean thourally and then roll it back to seal end. You need wire gauge drill or orfice cleaning tools as .031 is a pretty small hole. A gauge put in the plug on side of the regulator block should read well less than 100 psi in neutral, more like 40 psi if it is working correctly. I often drill them oversize on worn tractors but that is usually on the 4 & 560's with teledepth hitch valves. A short rubber hose instead of solid pipe at the pump end will reduce noise. Later pipes were made with hose section.
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