Siemens Maxum II PD PA AP Service Manual page 95

4. Using a syringe with Krytox 143 AY lubricating oil, place a drop of oil on sidewall of each
valve body (8) plunger hole.
5. Reinstall the six plungers (7) into their valve body positions. Using tweezers, move each
plunger up and down to thoroughly lubricate them. Plungers must not protrude above valve
body (8) top surface. Refer to Figure 7-3 for plunger orientation.
6. Using clean lint free cloths wetted with acetone, remove excess lubricating oil from top of
valve body (8).
7. Install silicon "O" ring (6), Dacron cushion disc (5) and clear Teflon seal disc (4). Do not
lubricate "O" ring (6).
Note
The clear Teflon seal disc (4) must be mounted ON TOP of the Dacron cushion disc (5).
Align discs over plungers (7).
8. Securely holding valve cap (3), blow out each port and/or tube with compressed air to
remove all acetone and foreign matter.
9. It is recommended that appropriate torque wrenches be used for this step (available from
Siemens – PN's 1631005-002 and 1631005-003). Install valve cap (3) using the three
10-32 Allen screws (1). Screws must be tightened evenly in sequence 1, 2, 3, 1 sequence.
Tightening steps are as follows. Refer to Figure 4-40.
- Run screws down until they contact valve cap.
- Tighten screws with Allen driver until they are finger tight.
- Tighten screws to approximately 15 inch-pounds
- Tighten screws to approximately 20 inch-pounds
- Tighten screws to approximately 35 inch-pounds (3.95 Nm)
- Torque bottom adjusting set screw to 6.5 inch-pounds (0.73 Nm).
10.Valve is now ready for reinstallation and placing into operational service.
Maxum II Valves and Oven Components
Service Manual, 10/2018, A5E42019844001
NOTICE
When installing "O" ring (6), Dacron cushion disc (5) and clear Teflon seal disc (4), do not
use any type of grease as a lubricant. There must be no foreign contaminants on discs.
NOTICE
Do not use grease when installing O-ring.
(1.69 Nm). This is a ¼ turn maximum.
(2.26 Nm). This is another ¼ turn maximum.
Valves
4.6 Model 11 Valve
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