Preventative Maintenance; Service Checks - DeVilbiss KB-522 Operation Manual

2. Adjust the spray gun controls as described in
the Operation Manual supplied with the gun.
3. Turn the regulator knob (15) to the minimum
pressure and open the pressure relief valve
(6) to vent any pressure in the cup.
4. Remove cup (11) by turning ring (1) counter-
clockwise and fill with the coating material,
DO NOT OVERFILL. (If using the liner Kit KK
-5051, see section on liner fitting)
5. Replace lid assembly on cup, push down
with the handle and tighten ring (1).
6. Close the pressure relief valve (6), turn on
CLEANING
DO NOT clean the cup lid assembly in a gun
washing machine as the safety valve (18), gauge
(6) and regulator (19) contain parts that will be
damaged.
1. Disconnect the air supply and relieve the
pressure in the cup.
2. Remove the cup (11) and empty surplus
coating material. Wipe the lid and the inside
of the cup clean.
3. Fill the cup with a small quantity of compati-
ble solvent and refit. Connect the air supply,
CONDITION
A Erratic regulation or
excess pressure in the cup
Insufficient pressure in the
B
cup

Preventative Maintenance

Service Checks

CAUSE
1 Regulator valve (17, 18) leak
2 Gauge (8) reading incorrectly
3 Safety valve (14) faulty
4 Regulator Spring (21) broken or
distorted
5 Regulator diaphragm (19) damaged Replace
1 Check valve (12) jammed.
2 Safety valve faulty.
3 Gauge (8) reading incorrectly
4 Air leakage at cup lid
7
and adjust the supply air pressure to 3.5 bar
(50 lbf/in2).
7. Adjust the material pressure to 0.7 bar (10
lbf/in2).
8. Test spray, adjust atomisation and material
pressures to suit required application rate.
NOTE: To reduce the material pressure turn
regulator (15) down and open the pressure relief
valve (6). Close relief valve (6), and readjust the
regulator (15).
spray the solvent until clean.
4. Disconnect the air supply and relieve the
pressure in the cup.
5. Remove the cup (11), empty the residual
solvent and dry internal surfaces.
6. Inspect that the check valve (12) and pres-
sure relief vent holes in the lid are free from
coating material.
NOTE: The check valve cap may be unscrewed
to aid inspection and cleaning, DO NOT disman-
tle any further.
© 2010 ITW Finishing Systems and Products
CORRECTION
Replace
Replace
Replace
Replace
Clean/replace.
Replace
Replace
Tighten ring (1), replace
Seal (9) or Slip Ring (2)
E
E