Pressure/Material Imbalance - Graco Reactor 2 H-30 Repair Parts

PROBLEM PROBLEM PROBLEM
Pumps do not reverse direction or
pumps do not move.
Erratic pump movement.
Pump output low.
Fluid leak at pump rod seal.
No pressure on one side.
NOTE: NOTE: Table 1 is related to troubleshooting problem, NOTE:
"Proportioning pump does not hold pressure when
stalled."
Table Table 1 1 1 Determine Table Determine Valve Determine Valve Leak Valve
B-side pump piston
valve is dirty or
damaged.
A-side pump inlet valve
is dirty or damaged.
334946H
Loose reversing proximity switch.
Loose piston packing bolt.
Faulty directional valve.
Pump cavitation.
Loose reversing proximity switch.
Faulty directional valve.
Obstructed fluid hose or gun; fluid
hose ID too small.
Worn piston valve or intake valve in
displacement pump.
Inadequate feed pump pressure.
Worn throat seals.
Fluid leaking from pump outlet
rupture disk.
Inadequate feed pump pressure.
Leak Location Leak Location Location
B-side pump inlet valve
is dirty or damaged.
A-side pump piston
valve is dirty or
damaged.
CAUSE CAUSE CAUSE
See
Direction, page
See
Direction, page
See
Direction, page
Feed pump pressure is too low.
Adjust pressure to maintain 100 psi
(0.7 MPa, 7 bar) minimum.
Fluid is too thick. Consult your
material supplier for recommended
fluid temperature to maintain a
viscosity of 250 to 1500 centipoise.
See
Direction, page
Replace directional valve.
Open fluid hose to clear obstruction,
or use hose with larger ID.
See pump manual.
Check feed pump pressure and
adjust to 100 psi (0.7 MPa, 7 bar)
minimum.
Replace. See pump manual.
Check if heater and PRESSURE
RELIEF/SPRAY valve (SA or SB)
are plugged. Clear. Replace
rupture disk with a new one; do not
replace with a pipe plug.
Check feed pump pressure and
adjust to 100 psi (0.7 MPa, 7 bar)
minimum.
Pressure/Material

Pressure/Material Imbalance

Pressure/Material
To determine which component is out of balance,
check the color of some sprayed material.
Two-component materials are usually a mix of
light and dark fluids, so the under-proportioned
component can often be readily determined.
When you have determined which component is
under-proportioned, spray off-target, focusing on the
pressure gauge for that component.
For example:
if component B is under-proportioned,
focus on the B-side pressure gauge. If the B
gauge reads considerably higher than the A gauge,
the problem is at the gun. If the B gauge reads
considerably lower than the A gauge, the problem
is at the pump.
Troubleshooting
SOLUTION SOLUTION SOLUTION
Pumps Do Not Reverse
40.
Pumps Do Not Reverse
40.
Pumps Do Not Reverse
40.
Pumps Do Not Reverse
40.
Imbalance Imbalance
39