Troubleshooting - Graco Husky 515 D51 Series Instructions Manual

Read Pressure Relief Procedure on page 11, and relieve the pressure before you check or service the
equipment. Check all possible problems and causes before disassembling the pump.
PROBLEM
Pump will not cycle, or cycles once and
stops.
Pump cycles at stall or fails to hold
pressure at stall.
Pump operates erratically.
Air bubbles in fluid.
Fluid in exhaust air.
Pump exhausts air from clamps (metal
pumps).
Pump leaks fluid from check valves.
Reed switch electrical signal output
erratic or inconsistent

Troubleshooting

CAUSE
Air valve is stuck or dirty.
Leaky check valves or o-rings.
Worn check balls or duckbill valves or
guides.
Check ball wedged in guide.
Worn diaphragm shaft seals.
Clogged suction line.
Sticky or leaking check valve balls.
Diaphragm ruptured.
Suction line is loose.
Diaphragm ruptured.
Loose manifolds or damaged manifold
o-rings.
Loose fluid side diaphragm plates.
Diaphragm ruptured.
Loose fluid side diaphragm plates.
Worn diaphragm shaft seals.
Loose clamps.
Air valve o-ring is damaged.
Worn or damaged check valve o-rings.
Switch moved
Running speed of pump less than reed
switch calibration speed.
Slow changeover or pump inlet pressure
too low.
SOLUTION
Use filtered air.
Replace.
Replace.
Repair or replace.
Replace.
Inspect; clear.
Clean or replace.
Replace.
Tighten.
Replace.
Tighten manifold bolts or nuts; replace
o-rings.
Tighten.
Replace.
Tighten.
Replace.
Tighten clamp nuts.
Inspect; replace.
Inspect; replace.
Re-install reed switch. See page 10.
Reset reed switch calibration with pump
running at or below minimum operation
speed. See page 10.
Increase pump inlet pressure to a
minimum of 40 psi.
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