Replacement Of Hood Using Hood Assembly; Replacement Of Gauge; Replacement Of Valve Assembly - MSA S-Cap-Air Maintenance Manual

5.2

Replacement of Hood using Hood Assembly

[Part number 10019481 Hood assembly spare part].
Pull clip from hose connection, then pull supply hose off the connection Take new hood
assembly, place 2 off felt discs [part number 10019508, felt discs spare part, pg 10] in the
free end of hose. Check O-ring on hose connection, replace if necessary [part number
10024118, O-ring for hose connection, pg 10]. Carefully push hose entirely on hose con-
nection, lock it in position with the clip [part number 10019483, clip spare part, pg 5].
Finally make function test.
5.3 Replacement of Pressure Indicator
Note: Prior to any servicing ensure that cylinder is fully discharged.
[Part number 10019482 pressure indicator spare part]
Unscrew old indicator. Check seal whilst indicator is dismounted, clean if required. Screw
in new indicator [18 Nm] using a hexagonal nut. Check for leaktightness by pressurising
cylinder and using liquid leak detector, leak detector spray, or soap solution with brush.
5.4

Replacement of Valve Assembly

Note: Prior to any servicing ensure that cylinder is fully discharged.
[Part number 10019485 valve assembly spare part]
Disconnect hood from valve. Pull clip from hose connection, then pull supply hose off the
connection. Unhook clip from firing pin. Unbotton pressure indicator from bag loop, then
withdraw complete cylinder / valve assembly from bag. Unscrew pressure indicator. Re-
move valve cap and firing pin. Clamp cylinder securely, and dismount complete valve as-
sembly from cylinder with 26-mm wrench (25,4-mm for old ones). Check cylinder interior
for contamination and that it is dry. Check cylinder thread with thread gauge for any dam-
age. The cylinder thread must be dry and free from contamination.
The replacement valve assembly comes complete with o-ring. The valve is screwed into
the cylinder with a locking force of 60 + 20 Nm torque. Check seal in gauge connection,
clean if required. Screw in pressure indicator [18 Nm ]. Screw valve cap with firing pin back
in place, then charge cylinder. Check for leaktightness by using liquid leak detector, leak
detector spray, or soap solution with brush. After leak test put cylinder and valve assembly
back in the bag. Check O-ring on hose connection, replace if necessary [part number
10024118, O-ring for hose connection, pg 10]. Check the two felt disks in the hose con-
nection for cleanliness, if necessary, replace [part number 10019508, felt disk, spare, pg
10]. Carefully push hose entirely on hose connection, lock it in position with the clip [part
number 10019483, clip spare part, pg 5].
Finally make function test.
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