Graco Ratio President Pump 10:1 - Manual (Page 10)

10 308738
Troubleshooting
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
1. Relieve the pressure.
2. Check all possible problems and solutions before
disassembling pump.
Problem Cause Solution
Pump fails to operate. Restricted line or inadequate air
supply. Clear; increase air supply.
Insufficient air pressure; closed or
clogged air valves, etc. Open; clean (be sure to use air fil-
ter).
Exhausted fluid supply. Refill; purge all air from pump and
fluid lines.
Damaged air motor. Service air motor. See manual
306982.
Fluid intake or piston valve needs
adjustment. Adjust. See manual 307044.
Pump operates but output is low on
both strokes. Restricted line or inadequate air
supply. Clear; increase air supply.
Insufficient air pressure; closed or
clogged air valves, etc. Open; clean (be sure to use air
filter).
Exhausted fluid supply. Refill; purge all air from pump and
fluid lines.
Clogged fluid line, valves, etc. Clear*.
Loose packing nut or worn throat
packings. Tighten packing nut (see page 8);
replace throat packings.
Damaged riser tube o-rings. Replace. See manual 307044.
Pump operates but output is low on
downstroke. Held open or worn intake valve. Clear; service. See manual 307044.
Damaged riser tube o-rings. Replace. See manual 307044.
Pump operates but output is low on
upstroke. Held open or worn fluid piston valve
or packings. Clear; service. See manual 307044.
Erratic or accelerated operation. Exhausted fluid supply. Refill; purge all air from pump and
fluid lines.
Held open or worn intake valve. Clear; service. See manual 307044.
Held open or worn fluid piston valve
or packings. Clear; service. See manual 307044.
Damaged riser tube o-rings. Replace. See manual 307044.
* To determine if the fluid hose or gun is obstructed, relieve the pressure and disconnect the fluid hose, and place
a container at the pump fluid outlet to catch any fluid. Turn on the air just enough to start the pump; about 1.4 to
2.8 bar (0.14 to 0.28 MPa, 20 to 40 psi). If the pump starts when the air is turned on, the obstruction is in the
fluid hose or gun.