Pressure Relief Procedure
312145B 3
Pressure Relief Procedure
Follow this Pressure Relief Procedure whenever you are
instructed to relieve pressure, stop spraying, check or service
equipment, or install or clean spray tip.
1. Engage trigger lock.
2. Shut off pump.
3. Disengage trigger lock.
4. Hold a metal part of the gun firmly to a grounded metal
pail. Trigger the gun to relieve pressure.
5. Engage trigger lock.
6. Open fluid drain valve (see System Requirements).
Leave drain valve open.
If pressure is not fully relieved:
• Spray tip is clogged. For RAC tip, see Cleaning
Tips/Clearing Clogs, page 4. For flat tip, slowly loosen tip
guard retaining nut to relieve pressure. Remove and clear
tip.
• Hose is clogged. Slowly loosen hose end coupling to
relieve pressure. Clean hose obstruction.
System Requirements
• Install a bleed-type master air valve on a pneumatic pump
air supply line to relieve air trapped between this valve
and pump after air regulator is shut off. Trapped air can
cause the pump to cycle unexpectedly.
• Install a fluid drain valve between the pump and gun to
relieve pressure in displacement pump, hose, and gun.
Triggering to relieve pressure may not be sufficient. See
Pressure Relief Procedure.
Grounding
Check your local electrical code and pump/sprayer manual for
detailed grounding instructions.
• Spray gun: ground through connection to a grounded fluid
hose and pump/sprayer.
• Fluid hose: use only grounded hoses.
• Fluid supply container: follow local code.
• Object being sprayed: follow local code.
• Solvent flushing pails: follow local code. Use only conduc-
tive metal pails placed on a grounded surface. Do not
place pail on a nonconductive surface, such as paper or
cardboard, which interrupts grounding continuity.
• To maintain grounding continuity when flushing or reliev-
ing pressure: hold metal part of gun firmly to side of a
grounded metal pail, then trigger gun.
Gun Trigger Lock
Tip Installation
RAC Tip
1. Follow Pressure Relief Procedure. Engage trigger lock.
2. Insert housing (A)
through back of retaining
nut (B) and pull it forward.
Install metal seal (20a) in
housing (A), flat side first.
3. Install tip cylinder (20c) so
small orifice (X) faces
front.
4. Insert tip guard (19) into
place. Insert screw (20d)
and tighten. Install white
gasket (20b) in housing.
Install assembled RAC
onto spray gun.
Flat Tip
1. Follow Pressure Relief Procedure. Engage trigger lock.
2. Insert tip (32) and gasket (30) into back of guard (31).
3. Install guard over end of gun.
To prevent injury when the gun is not in use, always engage
the gun’s trigger lock if unit is being shut down or left
unattended. A wallet-sized warning card with important
injection treatment information is included with the gun.
Additional cards are available at no charge. Provide a card to
all operators.
Trig ger
Tr ig ge r
Locked
(no spray)
Unlocked
(spray)
ti5048b
ti5049b
B
A
20a
A
X
20c
20b20d
19
30
32
31
ti10051a
