Graco DutyMax DH230 HD Operation, Parts page 32

Troubleshooting
Problem
Displacement pump operates,
but output is low on down stroke
and/or on both strokes
Paint leaks and runs over side of
wet cup
Excessive leakage around
hydraulic motor piston rod wiper
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 16.
32
Cause
Piston packings worn or
damaged
Intake valve ball check not
seating properly
Suction tube air leak
Hydraulic oil filter is dirty
Loose wet cup
Throat packings worn or
damaged
Piston rod seal worn or
damaged
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
Solution
Tighten packing nut or replace
packings. See manual 334654
Service intake valve ball check.
See manual 334654
Replace filter.
Tighten wet cup enough to stop
leakage
Replace packings. See manual
334654
Replace these parts. See
manual 334654
Increase pressure, page 18
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 16
Check for loose connections on
siphon assembly, tighten, then
reprime pump
Tighten
Refill supply container
Turn sprayer OFF. Add fluid*.
See page 16
Turn power switch ON
Check circuit breaker at power
source. Reset motor switch
334606J