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Troubleshooting
12 332198C
Troubleshooting
Problem Cause Solution
Pressure is higher on one side
when setting pressure with function
knob.
Pump intake valve partially plugged. Clean pump intake valve.
Air in hose. Fluid is compressible. Purge air from hose.
Unequal size hoses. Use matching hoses.
Pressures are not balanced when
running but pressure is generated
and holds on both strokes.
Feathering the valve lever to
decrease the flow rate through the
gun.
When opening or closing the valve,
always move the lever all the way.
Do not try to control the flow rate by
partially opening the lever.
Unequal viscosities. Check that A (ISO) and B (RES)
chemicals are within the chemical
manufacturer’s specified applica-
tion temperature range.
Change restrictor at mix point to
balance back pressure.
Restriction on one side. Clean mix module, restrictors, or
check valves at mix manifold.
A (ISO) side rich; lack of B (RES)
side.
A (ISO) side gauge is low. B (RES) side restriction down-
stream of gauge. Check gun check
valve spring, mix module, or mix
manifold restrictor screen.
B (RES) side gauge is low. B (RES) side material supply prob-
lem. Check B (RES) side inlet
strainer and pump intake valve.
B (RES) side rich; lack of A (ISO)
side.
A (ISO) side gauge is low. A (ISO) side material supply prob-
lem. Check A (ISO) side inlet
strainer and pump intake valve.
B (RES) side gauge is low. A (ISO) side restriction downstream
of gauge. Check gun check valve
spring, mix module, or mix manifold
restrictor screen.
Flow will not shut off when ball valve
lever is closed.
Worn ball valve seat of ball. Replace ball valve. See assembly
specifications in illustration on
page 13.