Arjohuntleigh FLOWTRON UNIVERSAL Service Manual page 60

Pump Repair
19.15 Carefully lift the pinned rotor assembly off the spring mount (refer to Figure 45).
Note: Make sure you do not lose any of the four springs.
19.16 Discard the old pinned rotor assembly and old module and stator sub-assembly.
Pinned Rotor Assembly
Locating Hole
Figure 45 - Assembling Springs to Rotor and Spring Mount
19.17 Make sure the spring mount is on a flat surface, with the four pegs and springs on top (refer to
Figure 45).
Note: Make sure the four springs are still located on the pegs.
19.18 Turn the new pinned rotor assembly (Table 15, Item 10) so that the four locating holes are on the
underside (refer to Figure 45).
19.19 Lower the pinned rotor assembly down onto the spring mount, making sure that the four pegs
and springs on the spring mount are located in the four locating holes in the pinned rotor
assembly.
19.20 Lightly press the spring mount and new pinned rotor assembly together, so that the four springs
are retained between them, and do the following (refer to Figure 44):
19.20.1 Turn them over so that the spring mount is on top.
19.20.2 Place the spring mount and pinned rotor assembly onto the stator on the module and
stator sub-assembly (Table 15, Item 20).
Note: Make sure the hole in the centre of the pinned rotor assembly is located over the
bush in the centre of the stator.
19.20.3 With the orientation of the module and stator sub-assembly as shown in Figure 46, turn
the spring mount and pinned rotor assembly round so that the slot in the drive dog is in
the approximate "East-West" position shown.
Note: This alignment is necessary so that the stepper motor drive shaft can be
assembled onto the pinned rotor assembly (refer to Para 19.24, below).
19.21 Carefully release your pressure on the spring mount.
Note: Make sure that the four springs do not push the spring mount up and off of the pinned
rotor assembly!
19.22 Put the stepper motor and mounting bracket on a flat surface, with the drive shaft on top.
19.23 With the orientation of the stepper motor mounting bracket as shown in Figure 46, turn the
stepper motor drive shaft round so that the pin in the end of the drive shaft is in the approximate
"East-West" position shown.
19.24 Assemble the stepper motor and mounting bracket onto the spring mount and the module and
stator sub-assembly, as follows (refer to Figures 44 and 46):
19.24.1 Turn the stepper motor and mounting bracket back over so that the drive shaft is on the
underside, and put it onto the top of the spring mount, module and stator sub-assembly.
Chap 5
Page 22
Flowtron Universal Service Manual
SER0009
Spring (4 off)
Peg (4 off)
Spring Mount
Issue 2
Sep 2009