Troubleshooting – Graymills DDP .375' Pump OMI User Manual
Page 13
13
Troubleshooting
PROBLEM
CAUSE
SOLUTION
There are air bubbles in the fluid.
The suction line is loose, or there is a
lack of thread sealant.
Tighten the suction line. Use a com-
patible liquid thread sealant or Teflon
tape on connections.
The diaphragm (401) is ruptured.
Replace the diaphragm.
See page 23.
The manifolds (102) are loose or the
o-rings (108) are damaged.
Tighten the manifold bolts (104) or
nuts (106); replace the o-rings (108).
See page 21.
The outer diaphragm plates (103) are
loose.
Tighten the plates. See page 23.
There is fluid in the exhaust air.
The diaphragm (401*) is ruptured.
Replace the diaphragm.
See page 23.
The outer diaphragm plates (103) are
loose.
Tighten the plates. See page 23.
The pump exhausts air at stall.
The air valve cup (5) or plate (13) is
worn.
Replace these parts.
See pages 18, 19.
The shaft seals (30}) are worn.
Replace the seals.
See page 23.
The pump exhausts air from the
clamps.
The clamps (111) are loose.
Tighten the clamp nuts (113).
See page 14.
The pump exhausts air near the air
valve.
The air valve screws (15) are loose.
Tighten the screws.
See page 16.
The air valve o-ring (19) is
damaged.
Inspect; replace the o-ring.
See pages 18, 19.
The pump leaks fluid from the check
valves.
The o-rings (108) are worn or
damaged.
Inspect; replace the o-rings.
See page 21.