Hitachi FD2 1590 - Manual (Page 15)

Troubleshooting
311879F 15
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 flexi-
ble material such as EPDM, Buna-N,
fluoroelastomer, or silicon.
Fluid in exhaust air. Diaphragm ruptured. Replace. See pages 19-21.
Loose diaphragm shaft bolt (107). Tighten or replace. See 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 clamps (113), or
replace seats (201) or o-rings (202).
See page 18.
PROBLEM CAUSE SOLUTION