Fig. 14:
Function of diaphragm key
Procedure
1. Unscrew interior hexagon socket screws from head cover.
2. Remove head cover together with valve clusters and connections.
3. Carefully bend up side of diaphragm.
4. Attach diaphragm key to diaphragm support disk.
5. Unscrew diaphragm clamping disk, diaphragm and diaphragm support disk.
6. Apply alcohol or cleaning solvent to release diaphragm from supporting washer if it has become
stuck.
7. Remove diaphragm and diaphragm support disk from square of diaphragm clamping disk.
8. Pay attention to spacer disks under diaphragm support disk.
– Use original spacer disks for each installation location when mounting.
9. Inspect diaphragm for damage.
7.6.3 Installing diaphragms for MVP 070-3 C
Required tools
● Allen key,
WAF 5
● Diaphragm key
WAF 66
● Calibrated torque wrench (tightening factor ≤ 1.6) for hexagonal, size 6
Spare parts required
● Overhaul kit
Required consumables
● Clean, dry cloth
Procedure
1. Clean all parts with a dry, clean cloth.
2. Replace wear parts (diaphragms) according to spare part package.
3. Fit diaphragm with light side facing outward and diaphragm support disk on square of diaphragm
clamping disk.
4. Ensure correct seating of square in diaphragm support disk guide.
5. Place original spacer disks under diaphragm support disk.
6. Carefully lift side of diaphragm.
7. Using the diaphragm key, carefully reach through and grasp the diaphragm support disk.
8. Tighten diaphragm support disk with diaphragm key on vacuum pump connection rod.
9. Fit torque wrench onto diaphragm key (hexagonal, size 6).
10. Tighten diaphragm support disk.
– Tightening torque:
6 Nm
11. Fit head cover together with valve clusters and connections.
12. Ensure that cylinder pin on pump housing is seated in corresponding recess in head cover.
13. Screw in interior hexagon socket screws of head cover loosely, alternating screws in a diagonal
pattern.
14. Tighten interior hexagon socket screws of head cover, alternating screws in a diagonal pattern.
– Tightening torque:
12.0 Nm
Maintenance
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