Graco EnergyComplete 313221H Instructions - Parts Manual page 29

PROBLEM
Pressure is higher on one side when
setting pressure with function knob.
Pressures are not balanced when
running, but pressure is generated
and holds on both strokes.
Fluid leak in pump packing nut area. Worn throat seals.
Pressure doesn't hold when stalled
against gun in spray mode.
Pressure is higher on B side during
startup of recirculation, especially in
High Recirc mode.
One gauge shows half as many
pulses as the other when pumps are
cycling.
Status indicator (red LED) not lit.
A side rich; lack of B side.
B side rich; lack of A side.
313221H
CAUSE
Pump intake valve partially plugged.
Air in hose. Fluid is compressible.
Unequal size hoses or unequal hose
construction.
Unequal viscosities.
Restriction on one side.
Leaking Recirc/Spray valve.
Leaking piston valve or intake valve
in displacement pump.
Leaking gun shutoff.
This is normal. Component B is typi-
cally higher viscosity than component
A until the material is heated during
recirculation.
Loss of pressure on downstroke.
Loss of pressure on upstroke.
Motor Power switch off.
Loose indicator cable.
Failed control board.
A side gauge is low.
B side gauge is low.
A side gauge is low.
B side gauge is low.
Troubleshooting
SOLUTION
Clean pump intake valve. See page
36.
Purge air from hose.
Use matching hoses, or balance
pressures before spraying.
Change temperature setting to bal-
ance viscosities.
Change restrictor at mix point to bal-
ance back pressure.
Clean mix module.
Clean gun check valve screens.
Replace. See pump manual.
Repair, page 34.
Repair. See pump manual.
Repair. See gun manual.
No action required.
Intake valve is leaking or not closing.
Clean or replace valve; see page 36.
Piston valve is leaking or not closing.
Clean or replace valve or packings;
see page 35.
Cycle Motor Power off
on to reset breaker.
Check that cable is connected at J10
pins 1 (red) and 2 (black) on control
board. See page 39.
Replace board. See page 39.
B side restriction downstream of
gauge. Check gun check valve
screen, mix module, or mix manifold
restrictor.
B side material supply problem.
Check B side inlet strainer and pump
intake valve.
A side material supply problem.
Check A side inlet strainer and pump
intake valve.
A side restriction downstream of
gauge. Check gun check valve
screen, mix module, or mix manifold
restrictor.
, then
29