Table of Contents
Advertisement
WARNING
To reduce the risk of serious injury whenever you are
instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 12.
PROBLEM
Pump fails to operate
Pump
operates,
but
output low on both
strokes
Pump
operates,
but
out-put
low
on
downstroke
Pump
operates,
but
out- put low on upstroke
Erratic or accelerated
pump speed
*To determine if the fluid hose or gun is obstructed, relieve the pressure. 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, contact your Graco distributor.
16
308151
Troubleshooting Chart
CAUSE
Restricted line or inadequate
air/hydraulic supply; closed or clogged
valves
Obstructed fluid hose or gun/valve; fluid
hose ID is too small
Fluid has dried on the displacement rod Clean; always stop pump at bottom of stroke;
Dirty, worn, or damaged motor parts.
Restricted line or inadequate
air/hydraulic 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 the displacement
pump
Held open or worn intake valve.
Fluid too heavy for pump priming
Held open or worn piston valve or
packings
Exhausted fluid supply
Fluid too heavy for pump priming
Held open or worn piston valve or
packings
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 valves are open.
Open, clear*; use a hose with a larger ID.
keep wet-cup 1/3 filled with compatible solvent.
Clean or repair; see separate motor manual.
Clear; increase air/hydraulic supply.
Check that the valves are open.
Open, clear*; use a hose with a larger ID.
Close.
Use bleeder valve (see pages 13 and 14); use
ram.
Replace packings.
Clear valve; service.
Use bleeder valve (see pages 13 and 14); use
ram.
Clear valve; replace packings.
Refill and prime.
Use bleeder valve (see pages 13 and 14); use
ram.
Clear valve; replace packings.
Clear valve; service.
Advertisement
Table of Contents
