Graco Inc. 232901 - Manual (Page 36)

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