Graco 965466 Manual De Usuario

System will not run or
stops while running.

Air pressure or air

volume is too low.

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.

The fluid valves or
hoses are closed or
restricted.

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.

The air motor is
worn or damaged.

Service the air motor. See “servicing the Air Motor” on page 17.

The displacement

cylinder(s) is
damaged or has
seized

See troubleshooting techniques below to isolate the problem
cylinder. See “Service the cylinders” on page 16.

The fluid pressure
bounces significantly
(>500 psi) while pump is
running

Air volume is too
low.

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.

Feed pump
pressure is too
high.

Reduce feed pump pressure. Feed pump pressures must be less
than 25% of proportioner output pressure.

The displacement
cylinder(s) check
valves are not
seating.

See troubleshooting techniques below to isolate the problem
cylinder. See “Service the cylinders” on page 16.

Mix ratio test is
significantly different from
the mix ratio setting.

Mix ratio test was
not performed at
the normal
operating pressure
of the pump

Perform ratio test again following ratio test procedure on page 12.

Running out of one
material.

Check and refill material reservoirs. Repeat the test after the air has
been removed from the system.

The displacement

cylinder(s) are worn
or the check valves
are not seating.

See troubleshooting techniques below to isolate the problem
cylinder(s). See “Service the cylinders” on page 16.

Spray output is spitting

Running out of one
material.

Check and refill material reservoirs. Remember that once air is in

the fluid system it may take a while for all of it to escape..

Siphon hoses are
leaking in air.

Tighten and seal all siphon fittings on proportioning pump and feed

pumps.

A squeaking or knocking
noise is heard.

The bearings are
dry or worn.

Lubricate the bearings or replace them if required. See “service the

bearings” on page 18.

The proportioner speeds

up or runs erratically

Running out of one

material.

Check and refill material reservoirs.

The cylinders are

worn or damaged.

See troubleshooting techniques below to isolate the problem
cylinder(s). See “Service the cylinders” on page 16.