34
AD
since 1928
AD
since 1928
8.0 - TROUBLE SHOOTING
For drawings and positions see chapter 7.0.
Pump will not run
• Check there is sufficient air pressure.
• Check that the emergency stop valve is open.
• Check inlet air filter and muffler for debris.
• Check that the suction- and discharge lines are open.
• Remove the muffler/air outlet hose and check that the air motor pivot
moves freely.
• Open the pump and check the diaphragms, air outlet seals (pos 19) and
air check valves (pos 20-23).
• Check that the shaft (15) moves freely.
• Check the pivoting valves bearing – seal may be worn out.
Pump does not prime
• Check that the suction and discharge lines are open.
• Check that all suction connections are air tight.
• Increase the stroking speed.
• Check that the cover nuts are tightened.
• Check the diaphragms (pos 5).
• Check that the inlet fluid check valves (pos 7 and 12) seal to the seats.
• Replace the shaft bushing (pos 14) if it is worn.
Erratic pump action/
heavy pulsation
• Check the diaphragms (pos 5).
• Check that the air motor pivot (pos 31) moves freely and that the rubber
seals (pos 31 and 34) are intact.
• Check the fluid check valves (pos 7 and 12).
• Check that the shaft spring (16) is undamaged.
• Check the air outlet seals (pos 19).
Pump runs but flow is reduced
• Check that the suction and discharge lines are open.
• Check that all suction connections are air tight.
• Check for possible cavitation. Slow pump speed down to match the
viscosity (thickness) of the fluid.
• Open the pump and check the diaphragms (pos 5) and the fluid check
valves (pos 12 and 7).
• If the shaft bushing (pos 14) is worn the internal slip increases and flow
decreases - change the bushing.
• Check that the air channels are free from debris.
Fluid comes out of the air ex-
haust
• Check for diaphragm rupture.
Air bubbles in the fluid
• Check that all suction connections are air tight.
• Check for diaphragm rupture.
AD Instruction Manual-2011EE-GB.indd 34
25/07/11 09:46
