Mitsubishi Electric EHSD-MED Service Manual page 73

DISASSEMBLY PROCEDURE
11. How to remove the manometer/ pressure relief valve/ air
vent (automatic)
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Swing the control box to the front. (Refer to Procedure 4.)
<Manometer>
(3) Remove the screw on the manometer cover. (Photo
11-1)
(4) Hold the sides of the manometer cover, disengage the 2
claws, and remove the manometer with cover. (Photo
11-1)
(5) Remove the G1/4" nut and feed the capillary tube
throughout the hydrobox.
• When reinstalling the G1/4" nut, use a new G1/4"
gasket. (Photos 11-2 and 11-4)
(6) Remove the manometer from the manometer cover while
pressing on the claws. (Photo 11-3)
• When reinstalling the manometer assembly on the
hydrobox beware not to put strain on the root of the
capillary tube as the capillary tube is easy to break at
the root.
<Pressure relief valve (3 bar)>
(3) Remove the field piping from the pressure relief valve.
(4) Remove the manometer by removing the G1/4" nut.
• When reinstalling the G1/4" nut, use a new G1/4"
gasket. (Photo 11-2)
(5) Remove the pressure relief valve with a flare joint using
2 spanners: one to hold the flare joint and the other to
turn the flare nut. (Photo 11-2)
(6) Remove the flare joint from the pressure relief valve
using 2 spanners: one to hold the flare joint and the
other to turn the pressure relief valve. (Photo 11-5)
(7) Eliminate loctite on the thread surfaces using remover.
(Photo 11-5)
• Before reinstallation, apply loctite over the thread
surface on the pressure relief valve.
• For more details about the loctite and the remover,
refer to page 79.
• Suitable drain pipe work should be attached to
pressure relief valve (3 bar).
• Make sure to carry out check (turn the cap) on
pressure relief valve (3 bar).
Photo 11-4 (E*PX series)
OCH712C
Gasket (G1/4")
Nut (G1/4")
PHOTOS/ FIGURES
Photo 11-1
Manometer
Manometer
cover
Photo 11-2 (E*S* series)
Flare nut
Flare joint
Photo 11-3
Manometer
Claw
Root
Photo 11-5
Pressure relief valve
73
Claw
Claw
Gasket (G1/4") Nut (G1/4")
Capillary tube Pressure relief valve (3 bar)
Flare joint
Threads for application
of loctite
Screw
Capillary
tube
Claw