TMG -HW41T Product Manual page 29

FLUID SYSTEM DIAGNOSTICS - Trigger Gun/Spray Nozzle
PROBLEM
No nozzle flow from nozzle
when trigger depressed.
Excess pressure when
trigger gun isreleased
Flow not stopping when
trigger gun released
Trigger action sticks
Trigger gun leaks
No chemical
Excessive chemical
Spray pattern irregular
Volume proper, pressure
low
Pressure proper, volume
low
WW W . T M G I ND U S T R I A L . C O M
POSSIBLE CAUSE
Broken piston rod in trigger gun
Missing metal insert in trigger
gun (European style gun)
Blockage in system past gun
Excessive pressure spikes
Broken return spring on trigger
gun
Debris in gun valve
Keeper plug too tight
Worn or bad o-ring
Stripped or loose connections
Chemical valve closed
Black nozzle
Chemical dried up in the injector Inspect and clean as necessary.
Chemical foot strainer clogged
Chemical line kinked
Chemical line too long
Chemical too dilute
No adjustment for low pressure
Incorrect injector orifice
Valve improperly adjusted, check
knob on injector
Chemical dilutionto strong
Clogged nozzle
Nozzle to large
Internal nozzle wear
Clogged nozzle
SOLUTION
If water flows through discharge hose without gun, check
trigger gun valve piston rod and replace if necessary.
Inspect to assure insert is in place.
Check nozzle or spray accessory for blockage and clear it.
After unloader increases pressure to a maximum, further
adjustment will only increase the
pressure spikes. Re-adjust.
If trigger action is too loose, return spring may need replaced.
Debris in gun valve can stop piston return. Clear debris.
It may be possible to loosen plug slightly without leakage but
it will likely need replaced.
Check trigger gun o-rings for ware or damage and replace.
Physical damage may not be apparent but unseen warping
from freezing or sever overpressure
maystill cause leaking.
Open chemical valve. If It chatters with no chemical delivery,
air is being drawn from the
upstream side of the pump. Check fittings, connections and
ensure the inlet line is fully submerged into the chemicaljug.
May be a strainer or check valve. Ensure that the ball is not
stuck or clogged.
Chemical line kinking or binding prevents chemical delivery.
An overly long chemical line can prevent the pump from
drawing chemical into the system. Try
installing a shorter line.
Verify chemicalstrength.
Downstream injectors only - Low pressure is required for
most injectors to draw chemical. If no
adjuster exists it may need low pressure spray nozzle
installed on the lance.
If not properly sized for the systems rated output, chemical
delivery problems will result. Check
serial plate for specs.
To properly adjust, a chemical flow meter may be used to
precisely measure chemical flow.
Verify chemicalstrength.
Spray pattern will be distorted if nozzle is clogged.
Ensure that the nozzle is sized properly sized for the system
A loss of pressure may result form gradual nozzle wear.
Replace a nozzle of correct size.
Spray pattern will be distorted if nozzle is clogged. Check
nozzle for clogging if the unit has a
pressure unloader.
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