Crystal T-1-CPF Hydraulic Comparator - Manual (Page 17)

Support  15
Type T Pump Operation Manual
Support
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TROUBLESHOOTING
Failure to Pump
X Problem: The pump fails to develop pressure when the hand lever is operated.
X Solution: Verify that the vent valve is closed and that there is sufficient fluid in the reservoir. If necessary, add fluid through the fill plug and follow the
Pump Priming Procedure.
If the failure continues, one or both of the check valves may be leaking. Use the following procedure to replace both the high pressure and low pressure
o-rings.
X To Replace the Check Valve O-rings
1 Raise the pump handle to the top of its stroke.
2 Position the valve rod selector for the o-ring you wish to replace.
(a) Pull out the valve rod selector to select the low pressure/high volume setting.
(b) Push in the valve rod selector to select the high pressure/low volume setting.
3 Remove the check valve plug you wish to replace.
4 Replace the o-ring located on the check valve plug.
Low pressure/high volume check valve plug o-ring. High pressure/low volume check valve plug o-ring.
5 Slowly pump two and one-half strokes, positioning the pump lever at approximately 45 degrees, halfway through its stroke.
6 Allow system fluid to flow out of the low pressure check valve, flushing entrapped air.