Kirby Morgan 37 & 57
Press the cover over the diaphragm.
Alternate method: If a KMDSI tool kit is not avail- able, a small jeweler’s screwdriver or metal scribe can be inserted in the slot on the end of the inlet valve to keep it from rotating, and needle nose pliers may be used to rotate the lever nut. Holding the slot of the inlet valve from rotating, carefully rotate the nut “In” (clockwise to remove lever play and “Out” (counterclockwise) to increase lever play.
Only turn the adjustment nut 1/8 turn at a time. De- press the lever momentarily after each adjustment and observe the lever play. It may be necessary to complete this procedure several times, as the proce- dure requires estimating the proper position of the nut. If the regulator free flow did not stop after this procedure, refer to regulator disassembly and cleaning sections of this manual.
8)When adjustment is complete, place the diaphragm and cover in place, and press tightly down on the cover to simulate the action of the clamp.
9)With the cover pressed tight against the diaphragm, if the regulator starts to free flow, the lever may need to be bent down slightly. If the regulator does not free flow, slowly depress the purge button until a slight free flow develops. The purge button should depress no further than 1/8 inch (3.0 mm) before the regulator develops a flow.
If the regulator does not develop a slight free flow when the purge button is depressed in 1/8 inch (3.0 mm), then the lever will require slight upward bend- ing.
Before bending the lever, double check the adjust- ments. It is rare that the lever requires bending in
a regulator that has been in service. Usually levers only require bending in new installations or because of damage during disassembly.
10)Install the clamp and clamp screw. Tighten the screw to the correct torque (see appendix for torque specifications).
11)Again, press on the purge button in the cover. It must have 1/16 inch (1.5 mm) minimum and 1/8 inch (3.0 mm) maximum free travel before it contacts the diaphragm. If there is more than 1/8 inch (3.0 mm) travel, the lever must be bent upward, per this chapter. If the button has only slight or no free travel, the lever must be bent down.
12)If the purge button travel is correct, the adjust- ment is complete.
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