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3
Maintenance
Follow all safety precautions as described in the Safety
Precautions section of this manual before proceeding.
NOTE: Refer to the Parts List section in this manual for part
identification.
Replacing/Servicing the Seal Assembly
If your spray gun leaks or spits at the tip when you release the trigger, the
needle or seat is worn, damaged, or dirty and must be replaced or cleaned.
Never attempt to perform maintenance on the spray gun
without first performing the “Pressure Relief Procedure.”
1. Disconnect the fluid hose from the gun.
2. Remove the tip and tip guard.
3. With the trigger depressed, remove the diffuser from the front of the
gun.
4. Remove the lock nut, rear housing, and retractor pins from the rear of
the gun head.
5. Remove the seal assembly from the front of the gun head by pushing
or gently tapping at the back of the seal assembly.
6. Soak the removed parts in the appropriate solvent and wipe clean.
7. Inspect the parts for wear or damage and use new parts during
reassembly of the gun, when necessary.
NOTE: Lubricate all packings and moving parts before reassembly
with a lithium-based grease.
8. Install the seal assembly into the front of the gun head.
9. Install the retractor pins into the rear of the gun head. Slide the rear
housing onto the retractor pins and secure in position with the lock
nut.
10. WIth the trigger depressed, install the diffuser into the front of the
gun head and tighten securely with a wrench.
11. Perform the “Adjusting the Seal Assembly” procedure described
below.
Adjusting the Seal Assembly
Proper adjustment of the seal assembly is essential to ensure
positive shut-off when the trigger is released.
1. Tighten the lock nut until the rear housing is flush against the gun
head.
2. Unscrew the lock nut 3/4 of a turn.
NOTE: To check the adjustment of the seal assembly:
1. Move the gun trigger lock to the locked position.
2. Pull the trigger.
With the trigger lock engaged, there should be 1/32” of
movement between the lock nut and the rear housing while
pulling the trigger.
Replacing/Removing the Filter
1. Move the gun trigger lock to the unlocked position.
2. Loosen and remove the handle assembly from the gun head.
3. Turning clockwise, unscrew the filter from the gun head.
NOTE: Refer to the Parts List section in this manual for part
identification.
4. Turning counterclockwise, screw the new or cleaned filter into the
gun head.
5. Make sure the handle seal is in position and thread the handle
assembly into the gun head until secure.
6. Move the gun trigger lock to the locked position.
Gun Filter chart
Part
Number
Application
Filter Type
color of
Filter Body
500-200-15 Synthetic resin, enamels, clean
varnishes, stains, azures
Extrafine
red
500-200-10 Base coat enamels, primer
enamels, fillers, marking paints,
textured enamels
Fine
yellow
500-200-06 Emulsions, latex paints, acrylic
paints
Medium
white
500-200-03 Filler paints, large area surfaces Coarse
green