User's Manual

Troubleshooting
332144C 37
One side doesn’t come up to pres-
sure in spray mode.
Low fluid in tank. Refill.
Dirty or damaged Recirc/Spray valve. Clean or repair, page 40.
Plugged fluid inlet strainer. Clear, see page 24.
Pump intake valve plugged or stuck
open.
Clean pump intake valve. See page
41.
Material is too viscous to pump. Warm material before adding to
tanks.
Pressure is higher on one side when
setting pressure with function knob.
Pump intake valve partially plugged. Clean pump intake valve. See page
41.
Air in hose. Fluid is compressible. Purge air from hose.
Unequal size hoses or unequal hose
construction.
Use matching hoses, or balance
pressures before spraying.
Pressures are not balanced when
running, but pressure is generated
and holds on both strokes.
Unequal viscosities. Change temperature setting to bal-
ance viscosities.
Change restrictor at mix point to bal-
ance back pressure.
Restriction on one side. Clean mix module or restrictor at mix
manifold.
Clean gun check valve screens.
Fluid leak in pump packing nut area. Worn throat seals. Replace. See pump manual.
Pressure doesn’t hold when stalled
against gun in spray mode.
Leaking Recirc/Spray valve. Repair, page 40.
Leaking piston valve or intake valve
in displacement pump.
Repair. See pump manual.
Leaking gun shutoff. Repair. See gun manual.
Pressure is higher on RES side dur-
ing startup of recirculation, especially
in High Recirc mode.
This is normal. RES is typically
higher viscosity than ISO until the
material is heated during recircula-
tion.
No action required.
One gauge shows half as many
pulses as the other when pumps are
cycling.
Loss of pressure on downstoke. Intake valve is leaking or not closing.
Clean or replace valve; see page 40.
Loss of pressure on upstoke. Piston valve is leaking or not closing.
Clean or replace valve or packings;
see page 40.
Status indicator not lit. Function knob is not set to Park/Off
when power is applied.
Turn function knob to Park/Off.
Loose indicator cable. Check that cable is connected at J3
on top motor control board. See page
45.
Failed control board. Replace board. See page 44.
Shorted pressure transducer or
potentiometer input.
See Control Board LEDs, page 44
for troubleshooting.
PROBLEM CAUSE SOLUTION