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③ Screw the lock nut and nosepiece into the nose housing.
④ Open end: Screw a Pop Nut onto the mandrel and adjust the nosepiece so that
approximately one thread of the mandrel screw thread extends beyond the Pop Nut
(Figure 7-5).
Closed end: Screw a POP Nut onto the mandrel until stopping, and adjust the
nosepiece at the position returned by one rotation (one screw pitch). (Figure 7-6)
⑤ Screw the lock nut and the nose housing together to fasten the nosepiece in the
place.
3. Replacement of the control nut and the T valve push rod
If the mandrel breaks or the screw thread of a Pop Nut is broken by an excessive
stroke, the control nut and valve push rod may be broken.
《Procedure》
(1) Detach the coupler to stop the supply of compressed air.
(2) Use a cross-head screwdriver to remove the truss machine screws and detach the
front case (Figure 7-7).
(3) Use the 1.5mm hexagonal wrench (provided) to loosen the lock screw on the control
nut and turn the control knob to the left until the control nut reaches the end of its
travel (Figure 7-8).
Figure 7-7
(4) Press the control knob and line up the projection on the control nut with the mast
housing, then turn the control knob to the left to remove it. Remove these parts as
an assembly from the body of the tool (Figures 7-9 and 7-10).
(5) Use the 1.5mm hexagonal wrench to loosen the lock screws of the control knob and
the control nut and remove them from the T valve push rod (Figure 7-11).
Control nut
Truss screw
Mast housing
Projection
Press and turn
Control knob
Figure 7-9
Front case
Lock screw
Ｔ valve push rod
16
Control nut
Figure 7-8
Assembly
Figure 7-10
Lock screw
Figure 7-11
PNT800
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