Graco ToughTek CM40 Operation page 18

Troubleshooting
Problem
Material water consistency
Water does not turn on, low
flow, or water does not turn off.
18
Cause
Inlet water pressure is fluctuating
below the regulator-set pressure.
Water pressure and flow is
constant, but there is less dry
material entering mix tube.
There is a debris in the water
control assembly (D).
Solenoid damaged or clogged with
debris.
Incorrect solenoid installed.
There is debris in the water control
assembly (D).
Disassemble the water control
assembly (D) and clean any
debris.
Solution
The water pressure regulator (DD) reduces
the pressure at the water metering valve
(DF) to a constant value. Adjust the water
pressure regulator (DD) so the pressure is
less than the lowest pressure possible from
water supply.
There is not enough dry material in the
hopper. Add more dry material to the hopper,
and keep adding dry material to maintain the
level as close to the hopper grate as
possible.
The material dosing auger shaft (FD) is dirty
or worn and needs to be cleaned or
replaced.
Verify the water inlet screen (DCC) is in
place and that it is clean.
Disassemble the water assembly and clean
any debris.
Clean debris from water dosing port (FCC).
Clean or replace water control solenoid (DE).
The solenoid must be "normally closed" type.
Use only genuine Graco replacement parts.
Verify the water inlet screen (DCC) is in
place and that it is clean.
Clean debris from water dosing port (FCC).
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