Troubleshooting
309528L
15
PROBLEM
CAUSE
SOLUTION
Leak in inlet or outlet sanitary fit-
ting.
Loose sanitary clamp.
Tighten clamp.
Damaged or worn gasket.
Replace gasket
Misalignment of inlet/outlet hose or
pipe.
Use flexible hoses at pump inlet
and outlet
Gasket does not seal.
Use a standard sanitary gasket of
flexible material such as Buna-N,
fluoroelastomer, or silicon.
Fluid in exhaust air.
Diaphragm ruptured.
Replace. See pages 19-21.
Loose diaphragm shaft bolt (107).
Tighten or replace (pages 19-21).
Damaged o-ring (108).
Replace. See pages 19-21.
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 16.
Worn shaft seals (402).
Replace. See pages 19-21.
Pump leaks air externally.
Air valve cover (2) or air valve cover
screws (3) are loose.
Tighten screws. See page 16.
Air valve gasket (4†
◆
) or air cover
gasket (22) is damaged.
Inspect; replace. See pages 16,
22-23.
Air cover screws (25) are loose.
Tighten screws. See pages 22-23.
Pump leaks fluid externally from
ball check valves.
Loose manifolds (102, 103), dam-
aged seal between manifold and
seat (201), damaged o-rings (202).
Tighten manifold bolts (106) or
replace seats (201) or o-rings
(202). See page 18.
