Graco Reactor H-25 Series Repair And Parts Manual page 23

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.
312063Z
CAUSE
Bent or loose activator plate, rocker
arm, or reversing switch.
Loose piston packing bolt.
Faulty directional valve.
Pump cavitation.
Loose activator plate, rocker arm, or
reversing 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 (216).
Inadequate feed pump pressure.
Troubleshooting
SOLUTION
See Pumps Do Not Reverse
Direction, page 25.
See Pumps Do Not Reverse
Direction, page 25.
See Pumps Do Not Reverse
Direction, page 25.
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 Pumps Do Not Reverse
Direction, page 25.
Replace directional valve.
Open, clear; use hose with larger ID.
See your pump manual.
Check feed pump pressure and
adjust to 100 psi (0.7 MPa, 7 bar)
minimum.
Replace. See your pump manual.
Check if heater (2) and PRESSURE
RELIEF/SPRAY valve (SA or SB) are
plugged. Clear. Replace rupture disk
(216) 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.
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