Mitsubishi Electric EHSC-VM6A Service Manual page 52

DISASSEMBLY PROCEDURE
5. How to remove water pump/ pump valve
<Water pump>
Close the 2 pump valves (OFF) before removing the water
pump, and open the valves (ON) after reinstalling the water
pump.
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the control box cover. (Refer to Procedure 3.)
(3) Disconnect the CNP1 connector and the earth cable in
the control box. (Photo 5-1)
(4) Release the water pump lead wire from the 3 cable
clamps, the cable strap, the fastener and the 3 coated
clamps and feed the lead wire out the control box without
putting strain on the CNP1 connector. (Photo 5-1)
(5) Swing the control box to the front. (Refer to Procedure 4.)
(6) Remove the pump support top by removing the 2 screws
holding it to the pump support under (Photo 5-2).
Note: To avoid dropping of the pump support top, hold it
by hand when removing the last screw, .
(7) Close (OFF) the 2 pump valves and remove the 1-1/2"
nuts using two spanners: one to hold the pump and the
other to turn the individual nuts.
Remove the water pump by cutting the band fixing the
pump to the pump support under. (Photos 5-2, 5-3)
w When either of the pump valve handles is stiff, remove
the handle and turn the vertical stem 90 degrees
clockwise mainly by using a spanner. (Photo 5-5)
w Set the water pump in the orientation of the arrow printed
on the water pump and in the way that the terminal box
faces to the front. (Photo 5-2)
w When reinstalling the 1-1/2" nuts, use new 1-1/2"
gaskets. (Photo 5-4)
<Pump valve>
(8) Remove the pump valves by removing the 1" nuts using
two spanners: one to hold the pump and the other to
turn each 1" nut . (Photo 5-2)
w When reinstalling the 1" nuts, use new 1" gaskets.
w When either of the pump valve handles is stiff, remove
the handle and turn the vertical stem 90 degrees
clockwise mainly by using a spanner. (Photo 5-5)
w When reinstalling the valves, place the handles to the
right hand side of the valves.
Note: Skip Steps (3) and (4) above when replacing the pump
valves only.
When replacing both the water pump and the pump
valves, skip Step (7) above.
Photo 5-4
Gasket 1-1/2"
Photo 5-5
Pump valve
Stem
PHOTOS
Photo 5-1
Water pump connector (CNP1)
Lead
wire
Cable
clamps
Cable
strap
Coated
clamp
Fastener
Photo 5-2
Gasket (1")
Nut (1")
Nut (1-1/2")
Screw
Pump
support
top
Nut (1-1/2")
Nut (1")
Gasket (1")
Photo 5-3
Pump support
under
Band
Nut (1-1/2")
Pump valve
52
Earth cable
Coated
clamps
Water pump
Pump valve
Screw
Terminal box
Pump valve