Technical data

16 309030
Troubleshooting
WARNING
PRESSURIZED EQUIPMENT HAZARD
To reduce the risk of a serious injury, follow the Pres-
sure Relief Procedure on page 13 before checking
or repairing any part of the gun or system.
NOTE:
 Check all possible remedies in the troubleshooting
charts before disassembling the gun.
 Some improper patterns are caused by the
improper balance between air and fluid. Refer to
Spray Pattern Troubleshooting, on page 19.
General Troubleshooting
Problem Cause Solution
Fluid leakage through venting
holes.
Worn packing (17) or needle (5). Replace packing or needle.
Air leakage through venting hole. Worn o-ring (9) or gasket (15). Check and replace parts as needed.
Air leakage from back of gun. Worn o-rings (8, 9). Replace o-rings.
Air does not trigger. Piston stem is disconnected from the
main body of the piston assembly (3).
Gasket (15) oriented incorrectly.
Replace piston assembly (3).
Rotate gasket 90 so passages in
gasket align with passages in gun.
Air does not shut off. Piston assembly not seating properly.
Swollen o-ring (8).
Worn piston stem o-rings (10, 11).
Bottom gasket (12) failed.
Clean/service piston assembly. Re-
place worn or swollen o-rings.
Replace o-ring.
Replace o-rings.
Replace gasket.
Fluid leakage from front of gun.
Fluid needle tip (5a) is dirty, worn, or
damaged.
Clean or replace fluid needle tip (5a)
or entire needle (5).
Dirty or worn nozzle (23). Clean or replace the nozzle.
Fluid is present at the air cap
holes.
Nozzle (23) is insufficiently tightened
or sealing surface is damaged.
Tighten or replace nozzle (23).