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6.2.2. Accessing the Sensor Assembly
The loading mechanism and vent seat for the MF-414 can be accessed from the top of the
regulator. Ensure the spring is de-compressed by rotating the hand wheel fully anti-clockwise
and follow the instructions below:
i.
Remove the T-Bar (30, 31) by unscrewing one side whilst firmly gripping the other.
ii.
With the regulator secured up-right in a vice, remove the bonnet (29) by using a
torque wrench or equivalent with 47mm open end.
iii.
Un-screw and lift the top works from the assembly, inclusive of the bonnet (29),
load spring (24), adjusting mechanism (25, 26, 27 & 28) and lower spring rest (21)
from the body.
iv.
The sensor assembly (13, 14, 15 & 16) can be removed from the body by using an
M5 bolt (supplied with kit) and pliers.
v.
The vent seat (14) can be accessed by removing the sensor (15) from the sensor
holder (16) and gripping the sensor firmly in a vice with the vent seat nut (13)
facing upwards.
vi.
The vent seat nut (13) can be removed using a pin spanner or equivalent and the
vent seat (14) can then be removed from the sensor (15).
vii.
Inspect the vent seat (14) for damage and replace if necessary.
viii.
Replace all 'O' rings (17, 18 & 19) located on the sensor (15) and sensor holder (16)
prior to reassembly, ensuring adequate lubrication is used.
ix.
After reassembling the sensor and holder, place the assembly into the regulator
body (1) ensuring that it is firmly in place.
x.
Remove the M5 screw from the sensor holder if used.
xi.
Screw the top works onto the regulator body and using a torque wrench, tighten
to 120Nm.
xii.
Tighten the securing grub screw (23) against the bonnet (29).
xiii.
Place the T-Bar piece with the male thread (31) through the hole on the adjusting
screw and tighten the second T-Bar piece (30) against it.
It is recommended that all parts in the repair kits are used. Any defect parts removed during
the service should be disposed of.
Replacement 'O' rings should be lubricated with suitable non-hydrocarbon grease such as
Krytox GPL 205.
10
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