Blagdon Pump X75 Aluminium - Manual (Page 11)

x75afvmdl7sm-rev0411 Page 9
WARRANTY:
This unit is guaranteed for a period of five years against defective material and workmanship.
POSSIBLE CAUSES:
A. Air leak in suction line.
B. Excessive suction lift.
C. Flap valve not seating properly.
D. Leakage at joint of suction manifold or elbow flange.
E. Suction line or strainer plugged.
F. Diaphragm ruptured.
POSSIBLE CAUSES:
A. Discharge hose or line plugged, or discharge head requirement
greater than air supply pressure.
(Disconnect discharge line to check.)
B. Spool in air distribution valve not shifting.
(Remove end cap and check spool — must slide freely.)
C. Diaphragm ruptured.
(Air will escape out discharge line in this case.)
D. Blockage in diaphragm chamber preventing movement.
(Shut off air supply and reopen after pressure is relieved.)
POSSIBLE CAUSES:
A. Flap valve not sealing properly in one chamber.
B. Diaphragm failure in one chamber.
C. Air leak at suction manifold joint or elbow flange one side.
PROBLEM
Pump cycles but will not pump.
(Note: higher suction lifts require faster
cycling speed for priming.)
PROBLEM
Pump will not cycle. (Note: Always
disconnect air supply to relieve air
pressure before disassembling any
portion of pump.)
PROBLEM
Uneven discharge flow. (Indicates one
chamber not operating properly.)
TROUBLESHOOTING