Excellent information. The suggestion to mark the mating faces for correct reassembly is, of course, good engineering practice but it's a part of the process that I'd never considered. I also appreciate the emphasis on not getting any points of excessive pressure on any of the gears -- my experience is that the biggest issue with reconditioned pumps is that the pump it too tight after the pump has been reassembled. The pump body and gears are very resistant to wear but the end plates are softer -- too much pressure (or probably a better description is a lack of working clearance) will result in uneven wear and gouging on the end plates which is exactly the issue that the repair was meant to fix in the first place! Very good tutorial, Ashley, and well presented. Thank you.
If some of the floating gears have needed replacing then the new cogs are not going to be marked. However, all original gears had a small chamfer on the inner lip of one face. This chamfer acted as a small oil reservoir and should always face in towards the centre of the main body. If the pump is tight to turn or very notchy after servicing, loosen off the the 4 body screws a whole turn each. Then rotate the drive spindle while retightening the screws a little at a time. This often makes quite a difference to smoothing out the action of the drive spindle. Finally, tape up the threads on the drive spindle, place this in a drill chuck and get the pump turning while immersed in a bowl of oil. This will help to bed in the moving parts.
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Excellent information. The suggestion to mark the mating faces for correct reassembly is, of course, good engineering practice but it's a part of the process that I'd never considered. I also appreciate the emphasis on not getting any points of excessive pressure on any of the gears -- my experience is that the biggest issue with reconditioned pumps is that the pump it too tight after the pump has been reassembled. The pump body and gears are very resistant to wear but the end plates are softer -- too much pressure (or probably a better description is a lack of working clearance) will result in uneven wear and gouging on the end plates which is exactly the issue that the repair was meant to fix in the first place!
Very good tutorial, Ashley, and well presented. Thank you.
Hi Bruce, glad you enjoyed this one
If some of the floating gears have needed replacing then the new cogs are not going to be marked. However, all original gears had a small chamfer on the inner lip of one face. This chamfer acted as a small oil reservoir and should always face in towards the centre of the main body.
If the pump is tight to turn or very notchy after servicing, loosen off the the 4 body screws a whole turn each. Then rotate the drive spindle while retightening the screws a little at a time. This often makes quite a difference to smoothing out the action of the drive spindle.
Finally, tape up the threads on the drive spindle, place this in a drill chuck and get the pump turning while immersed in a bowl of oil. This will help to bed in the moving parts.
Excellent info, thanks.
Glad it was helpful!