Table of Contents
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Refer to the table below to troubleshoot the Q-gun. Call our Technical Support at 1-877-272-6747
for additional assistance.
SYMPTOM
Product will not
dispense when the
handle is squeezed
Solution is running
backwards through the
gun and lines
(complete backwards flow)
Some solution is
running backward
through the gun
(leaking or backflow)
Fluid leaking from
cylinder
Leaking from injection
tee handle
Slow Injections
TROUBLESHOOTING
POSSIBLE PROBLEM
Incorrect check valve orientation
Plugged injection tip
Blockage in lines
Kinked line
Check valves are installed backwards
Check valves are not sealing
Blue O-rings are worn out
Injection tip is loose
Kink or blockage in lines
Product chemistry
Poor uptake conditions
Difficult-to-inject tree or injection site
Tips for SLOW tress:
SOLUTION
Verify that both front and rear check
valves are installed correctly - springs
should face forward, in the direction of
flow.
Clear injection tip of blockage of debris.
Inspect tubing for visual debris. Check
tubing ends. Replace tubing if necessary.
Check tubing for kinks or bends that may
restrict flow, and replace tubing if
necessary.
Reinsert check valves; springs should
point forward (in direction of flow).
May be due to chemical residue build-up,
debris, or worn-out springs. Clean check
valves and gun. Apply silicone grease to
valve cores. Replace check valves if
problem persists.
Performance may be improved
temporarily with lubrication (NJ Phillips
lubricant). O-rings should ultimately be
replaced.
Tighten injection tip. Ensure set screw is in
place, tight.
Inspect the tubing to ensure that the lines
are free of kinks or debris.
The product used may affect uptake time.
More viscous products typically take
longer to inject.
Poor uptake conditions (very dry to very
wet soils, weather conditions, time of day)
may result in slow uptake.
If uptake is poor with gun operating
correctly, try changing injection sites.
Try changing injection sites on the tree.
Lock the plunger in place using the tension
screw to give your hand a break.
7
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