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MAINTENANCE
Crusader
MC-8
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.
MANUAL
assembly in a vise between two strips of soft wood.
CAUTION: Do not tighten sise so as to damage or
bend the disc assembly.
The locknut (IO) should be torqued to 25-30 inch
pounds and the valve disc screw (15) is torqued to 12-15
inch pounds.
CLEANING AND INSPECTION
Before reassembling the valve, make sure that all parts
are clean and in good condition. Thoroughly clean the
serrations in the upper and lower valve bodies,
lf the valve seat assembly is defective or leaks more
than six drops per minute at 10 P.S.l. when the coil is
energized, it should be replaced.
REASSEMBLY
Position the diaphragm disc assembly on the upper
valve body ( 11) so that the holes in the diaphragm align
with the dowel pin (14) as well as with the pilot-channel
hole and the valve body mounting holes. Set the conical
spring (13) on the locknut (10). Carefully place the lower
valve body (12) on the diaphragm disc assembly, engaging
the dowel pin (14) with the hole opposite. Secure the eight
No. 10-24 fillister head machine screws ( 15). Tighten the
screws evenly around the valve body to 15.6 in.-! lbs.
Insert the valve seat assembly into the upper valve
body (1 !) and tighten with a I inch socket wrench to 75 ft.
lbs.
Screw the flux ring assembly (2) into the valve body.
Use a 2¼" end wrench to torque the assembly to 450
ft.
lbs.
Seat the cover assembly firmly on the flux ring
assembly and tighten.
TESTING VAL VE AFTER
SERVICING
After servicing, the valve should be tested using water
at approximately J700F±JOOF and DC voltage both at 10
VDC minimum, and 15 VDC maximum.
Apply water at 25 P.S.l. to valve inlet and outlet;
check for external leakage.
Reduce pressure to 10 P.S.I. and open valve out-
let. Check operation of valve at minimum and maximum
rated voltages cycling valve several times at each voltage.
Check internal leakage (thru seat and needle valve)
with 1 O P.S.I. at valve inlet and solenoid energized.
Maximum allowable leakage is six drops per minute thru
the needle valve and zero leakage thru the disc seat.
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