VERDER VA 50 - Troubleshooting

819.4496 15
Troubleshooting
1. Relieve the pressure before checking or servicing the
equipment.
2. Check all possible problems and causes before
disassembling the pump.
Warning
To reduce the risk of serious injury whenever you are
instructed to relieve pressure, always follow the Pressure
Relief Procedure on page 13.
PROBLEM CAUSE SOLUTION
Pump cycles at stall or fails to hold
pressure at stall.
Worn check valve balls (301), seats
(201) or o-rings (202).
Replace. See page 18.
Pump will not cycle, or cycles once and
stops.
Air valve is stuck or dirty. Disassemble and clean air valve. See
pages 16–17. Use filtered air.
Check valve ball (301) severely worn
and wedged in seat (201) or manifold
(102 or 103).
Replace ball and seat. See page 18.
Check valve ball (301) is wedged into
seat (201), due to overpressurization.
Install Pressure Relief Valve (see page
11).
Dispensing valve clogged. Relieve pressure and clear valve.
Pump operates erratically. Clogged suction line. Inspect; clear.
Sticky or leaking balls (301). Clean or replace. See page 18.
Diaphragm ruptured. Replace. See pages 19–22.
Restricted exhaust. Remove restriction.
Air bubbles in fluid. Diaphragm ruptured. Replace. See pages 19–22.
Loose inlet manifold (102), damaged
seal between manifold and seat (201),
damaged o-rings (202).
Tighten manifold bolts (112) or replace
seats (201) or o-rings (202). See page
18.
Loose fluid side diaphragm plate (105). Tighten or replace. See pages 19–22.
Fluid in exhaust air. Diaphragm ruptured. Replace. See pages 19–22.
Loose fluid side diaphragm plate (105). Tighten or replace. See pages 19–22.
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).
Inspect; replace. See pages 16–17.
Worn shaft seals (402). Replace. See pages 19–22.
Pump leaks air externally. Air valve cover (2) or air valve cover
screws (3) are loose.
Tighten screws. See page 17.
Air valve gasket (4) or air cover gas- ket
(22) is damaged.
Inspect; replace. See pages 16–17, 23–
24.
Air cover screws (25) are loose. Tighten screws. See pages 23–24.
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 and 112) or
replace seats (201) or o-rings (202). See
page 18.