Huntleigh AlphaBed, Service Manual

Page: 41 / 94

23 Replacing the Bellows Armature Assemblies and Pivots
23.1 Remove/disassemble the compressor/AV bracket assembly and remove the silencer bag
(Refer to Page 19, Section 22.1, 22.2,22.3 and 22.4).
23.2 Using long nosed pliers, extract the armature blade, part of bellows armature assembly (Fig 11,
Item 10 or 20) from the armature pivot (Fig 11, Item 30)
23.3 Unclip the bellows, part of bellows armature assembly from the valve body (Fig 11, Item 40)
and lift the bellows armature assembly clear of the compressor.
23.4 Repeat 23.2 and 23.3 as required to remove the other bellows armature assembly.
23.5 Discard the old bellows armature assembly and fit a replacement of the same type by reversing
the actions carried out in Section 23.3 and 23.2.
23.6 Fit a new silencer bag and gasket, then replace the compressor lid (Refer to Page 19 and
reverse the operations carried out in Section 22.4, 22.3 and 22.2).
23.7 Refit the compressor/AV bracket assembly to the pump case (Refer to Page 13, Section 15.2,
15.3 and 15.4 (new style AV mounts) or Page 15, Section 17.3, 17.4 and 17.5 (old style AV
mounts)).
23.8 Test the assembly. Note, in order to achieve flow/pressure performance, the new bellows may
have to be heated with a hot air gun whilst operating. This anneals the bellows permanently
and alters the pressure/flow characteristics.
Caution: The bellows will be damaged if overheated.
24 Replacing the Compressor Armature Pivots
24.1 Remove/disassemble the compressor/AV bracket assembly and remove the silencer bag
(Refer to Page 19, Section 22.1, 22.2, 22.3 and 22.4).
24.2 Extract the armature blade from the pivot (Refer to Section 23.2).
24.3 Use a sharp, pointed tool and carefully extract the pivot (Fig 11, Item 30) from the hole in the
compressor casing.
24.4 Discard old armature pivots and replace with same type. Carefully insert the new pivot into the
compressor casing using a small screwdriver to ensure the slot in the pivot is aligned to accept
the armature blade.
24.5 Fit the armature blade to the pivot reversing the actions carried out in Section 23.2.
24.6 Fit a new silencer bag and gasket, then replace the compressor lid (Refer to Page 19 and
reverse the operations carried out in Section 22.4, 22.3 and 22.2).
24.7 Refit the compressor/AV bracket assembly to the pump case (Refer to Page 13, Section 15.2,
15.3 and 15.4 (new style AV mounts) or Page 15, Section 17.3, 17.4 and 17.5 (old style AV
mounts)).
Issue 2 Chap 3
Nov 2001 SER0004 Page 21
Mini Pump Service Manual Pump Repair