KM 251 en
40 15.720148-V1.0
Clean the valves.
• At least every 12 months or after 4000 operating hours, or
• if the pump isn’t performing, or
• in the event of an error.
Clean the valves and replace if necessary (for stainless steel valves: inner parts of valve)
Change diaphragms and gear oil.
• At least every 12 months or after 8000 operating hours, change the dosing medium
and gear oil,
• in dusty installation site, change gear oil every 3000 operating hours.
Clean ball check of the double diaphragm
• after a diaphragm breakage, remove the ball check immediately and clean it.
Note
Only clean the ball check after a diaphragm breakage!
9.4 Checking the oil level
Caution
Check the oil level at least every 2 weeks and add oil if necessary.
Note
The rod length of the oil level gauge is
9.5 Cleaning the suction and pressure valves
!
Warning
When working on the dosing head, connections or lines: Wear the necessary pro-
tective clothing (goggles, gloves)!
Before removing the dosing head, valves and media lines, empty any remaining
medium in the dosing head into a driptray by carefully unscrewing the suction
valve.
Nominal width DN 8
• Screwed connection 5/8“
• Stainless steel/plastic
• optional spring-loaded
Nominal width DN 20 (for suction side only), with adapter
• Screwed connection 1 1/4“
• Plastic
Clean suction and pressure valves as follows:
1. Unscrew valves.
2. Unscrew screw parts and valve set using round pliers.
3. Dismantle inner part (seat, O-ring, balls, ball cages, if necessary spring).
4. Clean all parts, replace any faulty parts.
5. Reassemble valve.
6. Replace O-rings with new ones and screw valve back in.
for KM 251 27 mm; immersion depth to marking approx. 5 mm.
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