<5. Maintenance>
5-7
IM 02C01B04-01EN
5.9.4 To Remove Back Flexures
Unless front flexure
6
has already been removed,
7/64" hex-key wrench used in Step 2 must be cut
down to fit into screws
20
.
1. Using 7/16" open-end wrench, remove 1/4" cap
screws
12
holding bracket
11
.
2. Using a 7/64" hex-key wrench, remove two
screws and plates
20
holding back flexures
7
,
and remove back flexures.
3. Reverse this procedure to reassemble. Do not
tighten cap screws
12
.
4. Loosen cap screws
8
and force bar screws
3
. Apply 10 kgf/cm
2
or bar, 1 MPa, or 150 psi
to transmitter. Tap body lightly and tighten all
screws.
5. Calibrate transmitter (Refer to section 5.1.2).
5.9.5 To Remove Force Balance Unit
1. Remove relay mounting assembly
5
(Refer to
section 5.9.6).
2. Remove bellows capsule (Refer to section 5.5).
3. Using a 3/16" hex-key wrench, remove the
three socket-head screws holding force balance
unit to body. In removing screws, be careful not
to damage flexures
6
and
7
. Withdraw force
balance unit from body.
4. Reverse this procedure to reassemble. When
tightening screws removed in Step 3, follow
procedure on section 5.9.10 to maintain original
factory accuracy. Replace O-ring that fits
around force bar on top of body.
Apply a thin film of Vaseline or a similar
lubricant to the O-ring.
5. Calibrate transmitter (Refer to section 5.1.2).
5.9.6 To Remove Relay Mounting
Assembly
1. Carefully pry out nozzle and feedback O-ring
connections at amplifier (Refer to section 5.4).
2. Remove relay mounting assembly
5
by
unscrewing the two screws
9
above mounting
plate and small screw
10
beneath mounting
plate.
3. Reverse this procedure to reassemble. When
replacing O-ring connections, apply a thin film
of Vaseline or similar lubricant to O-rings.
5.9.7 To Remove Front Flexure
1. If transmitter has optional zero elevation or
suppression attachment, remove this assembly.
2. Disconnect dashpot flexure from arm (Refer to
section 5.9.1).
3. Carefully pry out both feedback and nozzle
O-ring connections at amplifier and remove
nozzle tubing from casting
1
(Refer to section
5.4).
4. Remove relay mounting assembly
5
(Refer to
section 5.9.6).
5. Using a 7/64" hex-key wrench, remove top
plate
2
by removing two plate screws
21
.
6. Using a 9/64" hex-key wrench, remove force
bar screws
3
.
7. Remove cap screws
8
and plates and lift front
flexure
6
off of dowel.
8. Reverse this procedure to reassemble. If force
bar has been removed or force balance unit
loosened from body, top of front flexure should
be visually lined up with casting
1
, so that there
is no twist evident in flexures. Then tighten plate
screws
21
. Do not tighten cap screws
8
.
9. Loosen cap screws
12
and force bar screws
3
.
Apply 10 kgf/cm
2
or bar, 1 MPa, or 150 psi
to transmitter. Tap body lightly and tighten all
screws.
10. Check dashpot alignment (Refer to section
5.9.2) and check calibration (Refer to section
5.1.2).
