Delta Monitor Question

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jammin

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I have just installed a Delta Monitor #1748 Shower/Tub valve and I was checking it out to prior to installing the tub surround. I have good flow when I turn on the hot water only, but if I turn on the cold water only and adjust the temperature knob to cold, I just get a dribble. Am I doing something wrong, or is it a bad valve? The o-rings and seats are installed correctly per the instructions.
 

hj

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Monitor

It sounds like the pressure balancing spool is stuck at one end. Sometimes you can take the cartridge and tap it against something to get it moving again.
 
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