4xbill 2 Posted October 22, 2007 Started to rebuild a Hydrolift I had for a while. It is going into my 2012. Got my O-ring kit from KraigRG(thanks). When I took out this part, the ball bearing came out, then the spring and then... a screw head?????:O I was baffled. I guess a previous owner had put it under the spring for more spring pressure. I don't think it was a factory mod. ? Anyone know if the original springs are still availabe? ? Share this post Link to post Share on other sites
GregB 934 Posted October 23, 2007 Its hard to tell with the fuzzy pictures but it looks like the wire size of the spring is a little small. You are also missing the relief plunger that the spring holds into the pump housing. I have that part drawn up, when I get home later this week I will try to find it scan and post. Also I will measure the spring. GregB Share this post Link to post Share on other sites
BLT 715 Posted October 23, 2007 On the edge of the mounting flange of pump, there should be a series of letters and numbers stamped in and a PH logo cast in pump housing. You should be able to get relief valve for pump as that series pump is still in production. A Parker Hanafin store should be able to help you. It's a "D" series pump. Share this post Link to post Share on other sites
GregB 934 Posted October 24, 2007 Good luck with Parker. I researched before about that. The pump is still being built, thats why you can still get the rebuild kit. Although the price has just about doubled the last time I asked. But as I recall, the pressure bypass valve, changed over the years. When I look for the drawing I'll try to find that info also. Greg Share this post Link to post Share on other sites
GregB 934 Posted October 25, 2007 I found my sketch for the relief plunger. The plunger seats on the pump housing seat about half way up the 30° taper. The spring on mine is heavier than the picture. Tommorrow I'll measure and post its dimensions. [img]/club2/attach/GregB/plunger.jpg[/img] I tried to turn one on the lathe, the tool grabbed and bent the small dia pin end. I used 4140 steel rod, was going to try to harden it. The one I have is hard enough that a file barely scratches the surface. GregB Share this post Link to post Share on other sites