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R
Individual performance check of a pump head:
Check the performance by measuring the vacuum at the inlet port of the
individual pump head:
Use a suitable vacuum gauge (e.g., DVR 2, cat. no.: 682902), being sure
that it is correctly calibrated. Measure the vacuum at the inlet port (marked
"IN"). A vacuum of less than 120 mbar should be achieved.
+ If the reading is higher, recheck the pump chamber and make sure
that the valves and the diaphragms are correctly seated (diaphragms
concentric with bore).
Replace diaphragms and valves of all eight pump heads
in the same way.
Replacing the valve at the distributor (outlet side)
➨ Loosen the union nut of the hose running directly to the manifold cover
(L) of the distributor (P) with an open-ended wrench (w/f) 17. Loosen
only the union nut at the pump head, not the one at the distributor.
➨ Turn the fitting (Q) with an open-ended wrench (w/f 14) to detach the
hose from the pump head (1/4 of a turn at maximum).
+ Do not remove the elbow fitting from the pump head; during reassem-
bly a leak may result.
page 117 of 129
➨ Loosely screw in the Allen head screws (R)
of the housing cover in a start pattern with a
5 mm wide Allen key, then tighten.
+ Recommended torque: 8.9 ft
➨ Unscrew the two countersunk head screws
M
(M) at the manifold cover with an Phillips
screw driver. Remove cover plate and mani-
fold cover.
lb
(12 Nm).
.
f
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