3. Place the diaphragm (blue side up) and the supporting washer on the square of the clamping
washer connecting screw.
– Pay attention to the seating of the diaphragm in the square of the connecting screw.
4. Place the original spacer disks on the respective connection rod.
5. Tighten the supporting washer with the diaphragm key on the connection rod.
7.3.4 Installing the pump head and valves
Avoid interchanging components
Always dismantle and mount only the pump head on one pump side in order to avoid inter-
changing the components.
The procedures are identical for both pump heads.
Prerequisite
● Diaphragms installed
Required tools
● Open-end wrench,
WAF 15
● Open-end wrench,
WAF 16
● Allen key,
WAF 4
● Calibrated torque wrench (tightening factor ≤ 1.6)
2
1
3
Fig. 9:
Correct mounting orientation of the valves in the head cover
1 Valve (inlet)
3
Head cover
2 Valve (outlet)
Procedure
1. Insert the valves into the head cover.
– Make sure that the valves have the correct mounting orientation.
2. Mount the housing cover.
3. First, screw on the cylinder screws of the housing cover loosely by hand, alternating screws in a
diagonal pattern.
4. Then tighten the cylinder screws of the housing cover, alternating screws in a diagonal pattern.
– Tightening torque:
max. 6.0 ±1 Nm
5. Mount the hose connection and the banjo bolts.
7.4 Checking the final pressure
The leakage rate of the vacuum pump ensures that the specified final pressure is reached and prevents
the formation of potentially explosive mixtures in the interior of the vacuum pump
After the diaphragm or valve is replaced, the vacuum pump reaches the specified final pressure value
only after a run-in period of several hours.
Test values
Observe the separate test specification.
● with gas ballast: < 3 hPa
● without gas ballast: < 2.0 hPa
Maintenance
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