Pfaff expression 2014 Service Manual page 64

Fitting:
Lift complete hook driving shaft 28 out of the lower right calotte bearing 92 as far as it will go (fig. 78).
Pull the flat toothed belt between calotte 95 and calotte bearing 92.
Place hook driving shaft 28 together with calotte 95 in the lower right calotte bearing 92 exactly.
Fit clamping plate 91 and fasten with screw 90.
Pull flat-toothed belt 98, which is in the inner housing, upwards.
Feed arm shaft 106 from the right into the housing (fig. 77).
Place flat-toothed belt 98 over arm shaft 106.
Feed arm shaft 106 into needle bar crank 101.
Insert arm shaft 106 into calotte bearings 104 and 105.
Fit clamping plates 103 and fasten with screws 102.
Check for free movement of arm shaft, if necessary establish the free movement.
Place flat-toothed belt 98 onto the upper and lower sprockets 93 and 94.
Set the flat-toothed belt's tension according to section 1.
Turn the handwheel until the fastening screw of the synchronizer control cam 32 faces downwards
(fig. 79).
At the same time pin 107 on the upper sprocket faces upwards.
Press needle bar crank 101 against the calotte of the left calotte bearing 104. At the same time tighten
screw 100 on needle bar crank 101.
Check for free movement of the arm shaft, if necessary establish it.
Attach connecting rod 99 (fig. 77).
Mount lockwasher 51 onto the needle bar frame.
Attach pull-spring 96.
Attach circlip 97 to the zigzag stepping motor.
Attach connection plugs 7, 12, 13, 14, 15 and 16 to the circuit board on the front housing shell.
Mount the front housing shell and fasten with torx screws 17, 18 and 19.
Mount the rear housing shell and fasten with torx screws 10 and 11.
Mount the stand cover and fasten with torx screws 5.
Attach the needle plate.
Attach connection plugs 3 and 4 to the circuit board on the baseplate.
Locate the baseplate, the freearm lid with bobbin thread monitor and the buttonhole sensor to the right
next to the machine.
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