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Problem
Fluid delivery is low
The sprayer overheats
Spitting from gun
Pump noise
Electric motor does not operate
*Check hydraulic fluid level often. Do no allow it to become too low. Use only Graco hydraulic fluid,
page 10.
3A4401A
Cause
Pressure setting too low
Displacement pump outlet filter
(if used) is dirty or clogged
Contractor gun filter (if used) is
dirty or clogged
Intake line to pump inlet is not
tight
Hydraulic motor is worn or
damaged
Large pressure drop in fluid
hose
Paint buildup on hydraulic
components
Oil level is low
Air in fluid pump or hose
Loose intake suction
Fluid supply is low or empty
Low hydraulic fluid level
Power switch is not ON
Tripped circuit breaker
Troubleshooting
Solution
Increase pressure, page 13
Clean or replace.
Clean or replace.
Tighten.
Bring sprayer to Graco
distributor for repair.
Reduce length or increase
diameter.
Clean
Fill with oil. See page 10
Check for loose connections on
siphon assembly, tighten, then
reprime pump
Tighten
Refill supply container
Turn sprayer OFF. Add fluid*.
See page 10
Turn power switch ON
Check circuit breaker at power
source. Reset motor switch
21
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