Graco 190ES Instructions De Service page 36

TYPE OF PROBLEM
Sprayer does not
respond
Sprayer will not prime or
takes too long to prime
Sprayer loses prime
while spraying
Sprayer does not have
enough pressure at gun
or pressure drops off
Sprayer packings
wearing out too quickly
Premature wear on prime
valve
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Troubleshooting
WHAT TO CHECK
If check is OK, go to next check
1. Wrong voltage and/or amperage
1. Air in paint pump
2. Inlet strainer clogged
3. Suction tube is loose
4. Lower ball is stuck
NOTE:Caused by insufficient cleaning and/or
not leaving paint thinner in sprayer.
1. Suction tube is loose
2. Lower ball not sealing on down stroke
1. Worn out spray tip
2. Clogged filters
3. Filtration being used for wrong coatings
(i.e. block fillers, elastomerics)
4. Wrong size filter mesh
5. Hose is too long and/or has wrong size
diameter.
1. Operating sprayer with clogged or no inlet
strainer
2. Priming sprayer without using prime valve
3. Upper packings have not been inspected/
adjusted on regular basis
4. Throat seal liquid not being used
5. Water or paint being left in sprayer
6. Worn pump cylinder
7. Kinked or clogged suction tube
8. Spraying aggressive coatings
(i.e. low and latex, zinc coatings)
9. Unrealistic expectations of packing life
1. Pressure being relieved at prime valve and
not at gun
2. Water or paint being left in sprayer
WHAT TO DO
When check is not OK refer to this column
1.Check that power source matches sprayer
requirements
1. Open prime valve to purge air from paint
pump
2. Clean strainer
3. Tighten fittings
4. Clean lower ball
1. Tighten fittings
2. Check for:
• Large debris holding ball open
• Worn or scarred lower ball
• Inlet strainer not being used
1. Replace spray tip
2. Clean filters
3. Operate with no filter or change coating
4. Select coarser filter mesh. 30 instead of 60,
60 instead of 100
5. Check sprayer instruction manual for
correct size hose
1. Clean/install inlet strainer
2. Prime sprayer with prime valve
3. Adjust upper packings after spraying
2 -- 5 gallons of paint and then weekly
4. Keep packing nut/wet cup 1/3 full with
throat seal liquid
5. Always leave paint thinner in sprayer
6. Replace pump cylinder
7. Replace suction tube
8. Use alternate packing materials. Consult
your sprayer instruction manual
9. Packing life varies with fluids sprayed and
pressures used
1. Relieve pressure at gun
2. Always leave paint thinner in sprayer