32 - 3
Suction Unloader
Assembling
1 Secure piston in a vice, large diameter uppermost with
the piston held in a split bushing for convenience.
Assemble the diaphragm, retaining plate and bolt, using
JCB Lock & Seal (part number 4101/0202) on the
threads (views 1- 4).
Note: When fitting a new diaphragm, it is essential to first
turn it inside out. The fabric (dull) side is marked PISTON
SIDE and must be in contact with the piston, smooth side in
contact with the retaining plate.
2 The outside diameter of the retaining plate has a radius
on one edge. The plate must be assembled with this
radius edge in contact with the diaphragm to avoid
damage to the latter.
3 Remove the piston/diaphragm assembly from the vice.
Into the unloader body fit joint and valve seat, securing
with countersunk screws 5.
4 Turn the unloader body upside down and place valve
and spring into position on the valve seat. Place joint
into position 6.
5 Carefully lower the diaphragm body into position,
ensuring that the atmospheric vent is in the correct
position. Secure the body with its six screws 7.
6 Lubricate special tool (part number 892/00878) inside
and out and insert the piston/diaphragm assembly.
Smooth the diaphragm back along the outside of the
tool. Replace spring then carefully insert the
piston/diaphragm assembly into the body. Align the
diaphragm with the holes in the body. Note that these
holes are off-set to ensure correct positioning of the
end cover. Carefully remove the special tool (views 8-
13).
7 Replace the end cover and secure with its four bolts. If
assembling a new atmospheric vent pipe, use JCB
High Strength Retainer (part number 4101/0602) to fix
in position (views 14-15).
Section A
Attachments
9803/7130
Section A
32 - 3
Issue 1
Airmaster Compressor
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