Graco Mark IV 249636 Manual Del Usuario página 26

Troubleshooting / Dépannage / Solución de problemas
Mechanical/Fluid Flow / Mécanique/écoulement de fluide /
Problemas mecánicos/caudal de fluido
Relieve Pressure, page 22. / Décharger la pression, voir page 22. / Alivie la presión, página 22.
TYPE OF PROBLEM
Pump output is low
Pump output is low
26
WHAT TO CHECK
If check is OK, go to next check
1. Spray tip worn
2. Spray tip clogged
3. Paint supply
4. Intake strainer clogged
5. Intake valve ball and piston ball are
not seating properly
6. Suction hose connections
7. Fluid filter, tip filter, or tip is clogged
or dirty.
8. Prime valve leaking
9. Verify pump does not continue to
stroke when gun trigger is released
(prime valve not leaking).
10. Leaking around throat packing nut
which may indicate worn or damaged
packings.
11. Pump rod damage
12. Low stall pressure
13. Piston packings are worn
or damaged
14. O-ring in pump is worn or damaged
15. Intake valve ball is packed
with material
16. Pressure setting is too low
17. Large pressure drop in hose
with heavy materials
Cleanup / Nettoyage / Limpieza
WHAT TO DO
When check is not OK, refer to this column
1. Follow Pressure Relief procedure Warning,
then replace tip. See your separate gun or tip
manual.
2. Relieve pressure. Check and clean spray tip.
3. Refill and reprime pump.
4. Remove and clean, then reinstall
5. Remove intake valve and clean. Check balls
and seats for nicks; replace if necessary;
see pump manual 310643. Strain paint before
using to remove particles that could clog pump.
6. Tighten any loose connections. Check for
missing or damaged seals.
7. Clean filter; see gun manual 311861.
8. Relieve pressure. Replace or clean prime
valve.
9. Service pump; see pump manual 310643.
10. Replace packings; see pump manual 310643.
Also check piston valve seat for hardened paint
or nicks and replace if necessary. Tighten
packing nut/wet-cup.
11. Repair pump. See pump manual 310643.
12. Turn pressure knob fully clockwise. Make sure
pressure control knob is properly installed
to allow full clockwise position. If problem
persists, replace pressure transducer.
13. Replace packings; see pump manual 310643.
14. Replace o-ring; see pump manual 310643.
15. Clean intake valve; see pump manual 310643.
16. Increase pressure.
17. Use larger diameter hose and/or reduce overall
length of hose. Use of more than 100 ft of 1/4 in.
hose significantly reduces performance
of sprayer. Use 3/8 in. hose for optimum
performance (50 ft minimum).
311287E