I have emailed Thetford which is the current
supplier of the rebuild
kit for Wilcox Crittenden Headmate heads, and they have been no help.
I must be reassembling the pump improperly, either the cam assembly, or the valve assembly. It flushes just fine in normal mode, but in dry mode it pumps super hard like pumping against a captive chamber of air, and water
continues to flow. I loosen the packing nut completely on the handle, it's not friction that is the problem.
Does anyone have photos or better instructions for assembly of this pump? Kit came with an exploded diagram lacking detail.
The first thing I have noted is that the inlet valve flapper assembly as shown in the picture is installed differently than the old one (unfortunately I didn't take pictures during dis-assembly with my messy hands, but this is evident from marks in the rubber from the housing). Looking at the cam and vacuum breaker finger I can't imagine it going back as the diagram indicates as this would provide rough/uneven surfaces for those parts
to contact. However I've tried a couple different orientations with no success, including putting back the old valve assembly.
Also I suspect the cam/vacuum breaker finger parts
could have been put back wrong, but the way they are in there, and how they mate together seem the only way logical. It would seem the finger, and the cam lobe should both be pushing forward on the two valve concurrently, since that would serve to open one and shut the other.
Laguna 33 "Star of the Orient"
Slidell, LA USA