Graco Dura-Flo 2400 Instructions-Parts List Manual page 18

WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 13.
PROBLEM
Pump fails to operate
Pump operates, but
output low on both p
strokes t k
Pump operates, but
output low on down output low on down-
stroke
Pump operates, but
output low on upstroke
Erratic or accelerated
pump speed pump speed
* To determine if the fluid hose or gun is obstructed, follow the Pressure Relief Procedure on page 13. Disconnect
the fluid hose and place a container at the pump fluid outlet to catch any fluid. Turn on the air/hydraulic power just
enough to start the pump. If the pump starts when the air/hydraulic power is turned on, the obstruction is in the fluid
hose or gun.
NOTE: If you experience air motor icing, call your Graco Distributor.
18 308152
Troubleshooting Chart
CAUSE
Restricted line or inadequate air/hy-
draulic supply; closed or clogged valves
Obstructed fluid hose or gun/valve; fluid
hose ID is too small
Fluid dried on the displacement rod
Dirty, worn, or damaged motor parts
Restricted line or inadequate air/hy-
draulic supply, closed or clogged valves
Obstructed fluid hose or gun/valve; fluid
hose ID is too small
Bleeder valve open
Fluid too heavy for pump priming
Worn packings in displacement pump
Held open or worn intake valve
Fluid too heavy for pump priming
Held open or worn piston valve or pack-
ings
Exhausted fluid supply
Fluid too heavy for pump priming
Held open or worn piston valve or pack-
ings
Held open or worn intake valve
1. Relieve the pressure.
2. Check all possible causes and problems before
disassembling the pump.
SOLUTION
Clear; increase air/hydraulic supply. Check that
valve are open.
Open, clear*; use hose with larger ID.
Clean; always stop pump at bottom of stroke;
keep wet-cup 1/3 filled with compatible solvent.
Clean or repair; see separate motor manual.
Clear; increase air/hydraulic supply. Check that
valves are open.
Open clear*; use hose with larger ID.
Close.
Use bleeder valve (see pages 14 and 16); use
ram.
Replace packings.
Clear valve; service.
Use bleeder valve (see pages 14 and 16); use
ram.
Clear valve; replace packings.
Refill and prime.
Use bleeder valve (see pages 14 and 16); use
ram.
Clear valve; replace packings.
Clear valve; service.