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General assembly information
A wide range of self-tapping fasteners are available.
PT screws are for plastic, self-tapping applications.
Almost all fasteners on the Asena® GW Volumetric Pump are self tapping and have the potential to be over tightened (over torqued).
The force required to create a thread for the first time is more than when reassembling a previously made joint.
Always use the correct torque level when first making an assembly stage.
Take care with the torque applied when re-assembling parts. Less torque is required, so a hand tool may be more appropriate.
In many situations a stripped thread will require replacement of the failed component.
The head patterns of the fasteners are of the following types:
- Pozi Number 1 (smaller X head)
- Pozi Number 2 (larger X head)
- Torx Number T8 (Small star profile, used typically on countersunk parts with smaller heads).
- Torx Number T10 (Medium star profile)
- M6 nut
Always select the correct tool and bit pattern for the fastener.
Torque guide
The following list outlines the torque levels established during pump manufacture.
Torque levels selected apply throughout product life for the Asena® GW Volumetric Pump.
Use this information as a guide to the 'do not exceed' torque levels when servicing the pump. When servicing it is recommended that
torque is applied gradually until the component is secure. In any process do not exceed the stated levels.
If a torque driver is available for servicing, this will help control the applied torque; otherwise, be aware that excess force may cause the
component to fail.
Pumping Block Assembly:
Stage Description
Cover Bearing
Pumping Block to Motor Gearbox
Plate Encoder disc to Gear Camshaft
Front Case Assembly:
Stage Description
Air Pressure Sensor Solid Base
Pumping Block Assembly to Front Case
Flow Stop Mechanism Assembly to
Front Case
Air Sensor Assembly to Door Assembly
Control Board Assembly to Front Case
Alaris® GW Volumetric Pump
Fitting & Replacement Guidelines
Fitting & Replacement Guidelines
Component Description
Screw - M2x5 CSK Posi SS
Screw - M2x8 Pan Posi SS
Screw - PT KC22x6 Pan Hd Torx T8
Component Description
Screw - PT WN1411 KC 25x12-Z
Screw - PT WN1412 KC 18x8-Z Pan Hd Posi
Screw - M3x10 CSK Posi SS
Screw - M3x12 Posi Hd Z+C
Screw - PT KC30x10 CSK (T8) Rogard
Screw - M2x5 CSK Posi SS
Screw - M3x6 Pan Hd Posi ZP+P
67/77
Established
Qty
Torque Process
4
10 cNm
3
10 cNm
2
20 cNm
Established
Qty
Torque Process
2
25cNm
1
10 cNm
2
30 cNm
2
30 cNm
2
45 cNm
2
10 cNm
2
40 cNm
1000SM00006 Issue 4
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