Arjohuntleigh FLOWTRON UNIVERSAL Service Manual page 58

Pump Repair
19.4 Reason for the repair
As the rotor turns inside the motor and manifold assembly (in the pump), the rotor rubs against the
module assembly, creating plastic dust. This dust can accumulate inside the motor and manifold
assembly in two critical areas:
• The silver positioning strip on the rotor. This can result in the loss of positional synchronisation of
the rotor.
• The centre pivot area of the rotor. This can increase friction and cause the rotor to stall.
These two conditions will cause the pump to fail, and then the pump will usually display either of the
following fault messages on the LCD screen.
• Pump Fault - Step alarm.
• LO (Low Pressure) alarm.
To repair the pump, proceed as follows:
19.5 Remove and disassemble the motor and manifold assembly (507111).
19.6 Discard the old rotor, stator and module sub-assemblies.
19.7 Reassemble the motor and manifold assembly using the following new parts:
19.7.1 507124, Pinned Rotor Assembly.
19.7.2 507125, Module and Stator Subassembly.
Note: All other parts in the motor and manifold assembly are re-used.
19.8 Re-install the motor and manifold assembly into the pump.
19.9 Replace the small-diameter transducer tube (between the motor and manifold assembly and the
control PCB assembly) with a new longer tube, since the pressure outlet is in a different position
on the new manifold assembly.
Spare Parts List
The following new spare part assemblies are required:
Note: These spare parts are fully assembled and ready to install.
Part No.
507124 Pinned Rotor Assembly (Spares)
507125 Module and Stator Sub-Assembly (Spares)
(includes Silicone Tube 1.5 ID, 3.5 OD, 160 mm long)
19.10 Remove the motor and manifold assembly from the pump (Chapter 5, Page 19, Section 18).
19.11 Remove the old transducer tube from the motor and manifold assembly and the control PCB
assembly, and discard it.
19.12 Put the motor and manifold assembly on a flat surface, and using a Torx T8 screwdriver, remove
the three screws which secure the stepper motor mounting bracket to the old module and stator
sub-assembly (refer to Figure 44).
Chap 5
Page 20
Flowtron Universal Service Manual
Description
SER0009
Qty
1
1
Issue 2
Sep 2009