Graco Hydra-Cat Xtreme XL Instructions - Parts Manual page 17

Troubleshooting
Troubleshooting Troubleshooting
PROBLEM
PROBLEM PROBLEM
System will not run or stops while
running.
The fluid pressure bounces
significantly (>500 psi) while pump
is running
3A3092A
CAUSE
CAUSE CAUSE
Air pressure or air volume is too
low.
The fluid valves or hoses are
closed or restricted.
The air motor is worn or damaged. Service the air motor. See
The displacement cylinder(s) is
damaged or has seized
Air volume is too low.
Feed pump pressure is too high.
The displacement cylinder(s)
check valves are not seating.
Troubleshooting
SOLUTION
SOLUTION SOLUTION
Increase air pressure. Check air
compressor and air supply filters
regulator, lubricator valves and
other components for blockages
and restrictions. If this is a new
system, be sure that air supply
components have been sized
properly.
Check the gun, fluid hoses, mix
manifold, static mixer, fluid filters,
regulators, valves and other fluid
line components for blockages and
restrictions. If this is a new system,
be sure that the fluid components
have been sized properly.
Disconnect the Air Motor, page
See troubleshooting techniques
below to isolate the problem
cylinder. See Disconnect the
Displacement Pump, page
Verify that air pressure at the air
motor inlet is not dropping during
pump changeover. Check air
compressor and air supply filters
regulator, lubricator valves and
other components for blockages
and restrictions. If this is a new
system, be sure that air supply
components have been sized
properly. 1" NPT hoses, fittings
and accessories are required to
provide the necessary air volume.
Reduce feed pump pressure.
Feed pump pressures must be
less than 25% of proportioner
output pressure.
See troubleshooting techniques
below to isolate the problem
cylinder. See Disconnect the
Displacement Pump, page
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