Graco Endura-Flo 4D150, Instructions - Parts Manual

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Troubleshooting
Troubleshooting
• Follow the Pressure Relief Procedure, page 13 ,
before checking or servicing the equipment.
• Check all possible problems and causes before
disassembly.
Problem Cause Solution
The check valve cartridges (9) are
worn.
Replace.
The outlet fluid valve is worn. Replace.
Pump cycles at stall or fails to hold
pressure at stall.
The diaphragm (18) is worn. Replace.
The air valve is stuck or dirty. Disassemble and clean air valve.
Use filtered air.
The check valve cartridges (9) are
worn.
Replace.
The fluid dispensing valve is
clogged.
Relieve pressure and clear valve.
The fluid hose line is pinched. Check lines.
The diaphragm plate (21) is installed
backwards.
Follow installation directions in
Install the Diaphragms, page 26 .
The checks are not installed
properly.
Follow installation directions in
Install the Fluid Manifolds, page 28 .
Pump will not cycle, or cycles once
and stops.
Pilot valves (12) are not working. Replace.
Suction line is clogged. Inspect; clear.
Check valves are sticky or leaking. Clean or replace check valve
cartridges (9).
Diaphragm (18) is ruptured. Replace.
Exhaust is restricted. Remove restriction.
Pump operates erratically.
Checks are not installed properly. Follow installation directions in
Install the Fluid Manifolds, page 28 .
Suction line is loose. Tighten. Fluid contains air bubbles.
Diaphragm (18) is ruptured. Replace.
Diaphragm (18) is ruptured or pump
has worn parts.
Replace worn parts. Check
compressed air supply.
Pump is running irregularly. Stroke
frequency is dropping, coming to a
standstill.
Pump is icing. Possible causes
include: compressed air too moist,
stroke frequency too high, local
temperature too low.
Remove ice by changing operating
conditions.
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