Graymills DDP 1' Aluminum Pump - Manual (Page 14)

14
Troubleshooting
PROBLEM CAUSE SOLUTION
Fluid in exhaust air. Diaphragm ruptured. Replace. See pages 18–20.
Loose diaphragm shaft bolt (107). Tighten or replace (pages 18–20).
Damaged o-ring (108). Replace. See pages 18–20.
Pump exhausts excessive air at stall. Worn air valve block (7), o-ring (6),
plate (8), pilot block (18), u-cups (10),
or pilot pin o-rings (17). Repair or replace. See page 15.
Worn shaft seals (402). Replace. See pages 18–20.
Pump leaks air externally. Air valve cover (2) or air valve cover
screws (3) are loose. Tighten screws. See page 15.
Air valve gasket (4) or air cover gasket
(22) is damaged. Inspect; replace. See pages 15, 21–22.
Air cover screws (25) are loose. Tighten screws. See pages 21–22.
Pump leaks fluid externally from ball
check valves. Loose manifolds (102, 103), damaged
seal between manifold and seat (201),
damaged o-rings (202). Tighten manifold bolts (106) or re-
place seats (201) or o-rings (202). See
page 17.