34
11.
Tighten the mechanical stop until it just touches the segment gear, then back out ½ to ¾
turn. Lock in place.
4.5. MIV Component Bench Procedures
The infinite mounting possibilities and/or apparatus configurations preclude providing MIV as-
sembly R&R instructions herein. See the OEM (or apparatus manufacturers) documentation to
R&R the selected MIV assembly.
Once removed from the apparatus, perform the associated REMEDY referenced bench proce-
dure (or procedures) to repair the failed MIV component.
4.5.1 Valve Disc Replacement
If inspection of the valve disc indicates that replacement is necessary order valve disc replace-
ment kit (Hale P/N 546-00086-000) and proceed as follows:
1.
Manually rotate the valve to the half open position. Approximately 5 turns from either the
fully open or fully closed position.
KEEP HANDS AND ARMS CLEAR OF THE VALVE DISC WHEN VALVE IS BEING OPERATED
WITHOUT SUCTION TUBE STRAINER OR SUCTION TUBE IN PLACE.
2.
Remove valve handwheel and open the operator panel.
3.
Tag and disconnect the electrical wires from the valve.
4.
Disconnect the relief valve discharge piping, air bleeder tubing, outboard primer tubing and
drain tubing from the valve body.
5.
Remove the cap screws and nuts, then remove the suction tube and valve from the fire pump.
6.
Take the valve body to a clean work area and clamp into a vise or other stable work holding
device being careful not to damage the valve sealing surfaces.
7.
Remove the four 3/8-16 x 2-½ inch long cap screws that hold the gearbox to the gearbox
adapter.
8.
Carefully remove gearbox (MIV-M) or gearmotor/gearbox assembly (MIV-E) from gearbox
adapter.
NOTE
THE SHAFT AND THRUST WASHER (MIV-E ONLY) MAY COME OUT WITH THE GEAR-
BOX. IF NOT, REMOVE SHAFT AND THRUST WASHER.
9.
Remove the two 7/16-14 x 1-inch long counterbore screws that holds the gearbox adapter to
the valve body. Remove the gearbox adapter from the valve body.
10.
Remove the trunnion from the bottom of the valve body using a 1-½ inch socket.
NOTE
THE STEM ON TOP OF THE VALVE DISC EXTENDS APPROXIMATELY 1-1/2 INCHES
INTO THE GEARBOX ADAPTER BORE. THE BOTTOM OF THE DISC, AT THE TRUNNION
END, MUST BE REMOVED FIRST AND THEN THE DISC MUST BE SLIGHTLY ROTATED
FOR THE STEM TO CLEAR THE BORE.
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