Hale Master Intake Valve - Manual (Page 24)

22
M
ASTER
I
NTAKE
V
ALVE
MICRO SWITCH REPLACEMENT:
If inspection or if troubleshooting indicates
that replacement is necessary order switch
replacement kit (Hale P/N 200-1210-50-0) for
MIV-M or switch replacement kit (Hale P/N
200-1210-52-0) for MIV-E and proceed as
follows:
1. To avoid damage to switch rollers,
manually rotate the valve to the half
open position. Approximately 5 turns
from either the fully open or fully closed
position. This will place the switch
sequencing slot in the valve shaft
midway between both sets of switch
rollers.
WARNING: 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. If there is enough room to remove the
gearbox and valve shaft (approximately
4-¼ inches) the valve may not have to
be removed from the truck, skip to step
8.
5. Disconnect the relief valve discharge
piping, air bleeder tubing, outboard
primer tubing and drain tubing from the
valve body.
6. Remove the six cap screws and two nuts
that hold the suction tube and valve to
the fire pump. Remove the suction tube
and valve.
7. 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.
8. Remove the four 3 /
8
-16 x 2-½ inch long
cap screws that hold the gearbox to the
gearbox adapter.
9. Carefully remove gearbox (MIV-M) or
gearmotor/gearbox assembly (MIV-E)
from gearbox adapter.
NOTE: The shaft and thrust washer
(MIV-E) may come out with the gearbox.
If not, remove the shaft and thrust
washer.
10. Remove the two #10-24 x ½ long hex
washer head screws that hold the switch
plate assembly to the gearbox adapter.
Also loosen the strain relief nut on the
gearbox wiring harness.
11. Carefully remove the switch plate
assembly from the gearbox adapter by
feeding the wiring harness through strain
relief and pulling switch plate assembly
out gearbox adapter opening. Only
feed out enough wiring harness to get
access to the wire terminals on the
switches.
12. Disconnect wire terminals from switches.
Remove the four #4-40 screws that hold
the switches to the switch plate.
13. Refer to figure 9. The manual valve
(MIV-M) uses two switches and four #4-
40 x ½ inch long screws. The electric
valve (MIV-E) uses four switches, two
spacers and four #4-40 x 1 inch long
screws. Mount switches to switch plate
and apply a coat of Loctite #242 or
equal to threads of screws and install
screws.
IMPORTANT: Pinch switches toward each
other when tightening screws (See figure
10. Torque screws to 5 lb-in (0.6 N-m).
14. If previously removed, insert the gearbox
wiring harness through the ¾ inch NPT