Graco Reactor H-VR Repair And Parts Manual page 25

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.
313540L
CAUSE
Damaged reversing switch assembly. See Pumps Do Not Reverse Direc-
Faulty directional valve.
Pump cavitation.
Faulty reversing switch connection.
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.
One pump is not in position "1".
Worn throat seals.
Fluid leaking from pump outlet rup-
ture disk (274).
Inadequate feed pump pressure.
Troubleshooting
SOLUTION
tion, page 27.
See Pumps Do Not Reverse Direc-
tion, page 27.
Feed pump pressure is too low.
Adjust pressure to maintain 100 psi
(0.7 MPa, 7 bar) minimum.
Fluid is too thick. Consult your mate-
rial supplier for recommended fluid
temperature to maintain a viscosity of
250 to 1500 centipoise.
See Pumps Do Not Reverse Direc-
tion, page 27.
Replace directional valve; see
Pumps Do Not Reverse Direction,
page 27.
Open, clear; use hose with larger ID.
See pump manual 313485.
Check feed pump pressure and
adjust to 100 psi (0.7 MPa, 7 bar)
minimum.
Move pump to position "1".
Replace. See pump manual 313485.
Check if heater (2) and PRESSURE
RELIEF/SPRAY valve (SA or SB) are
plugged. Clear. Replace rupture disk
(274) 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.
25