Pfaff EXPRESSION 2014, Service Manual, Page: 64 / 112

62
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.