Graco 3A1334E Manual De Usuario

Install only one pump per delivery system. Do not use 
the pumps in a parallel pump installation.

Loss of pump prime can occur if all the following events 
occur in sequence:

1.

A thermal relief event occurs.

2.

The air supply valve is closed.

3.

A dispense valve located at an elevation higher than 
the tank level, is open.

To prevent loss of prime, ensure the air supply valve is 
turned on before attempting to dispense fluid.

1.

Close the pump’s bleed-type master air valve.

2.

Close the pump air regulator and disconnect the air 
supply hose.

3.

Open the dispensing valve and dispense fluid into a 
waste bucket/container until pressure is fully 
relieved.

If you suspect that the dispensing valve is clogged, or 
that pressure has not been fully relieved after following 
the steps above, very slowly loosen the dispensing 
valve coupler or hose end coupling to relieve pressure 
gradually, then loosen completely.

To determine the fluid output pressure using the air reg-
ulator reading, multiply the ratio of the pump by the air 
pressure shown on the regulator. 

For example a 3:1 ratio oil pump:

3:1 ratio x 100 psi air = 300 psi fluid outlet

A 3:1 pump is capable of 5:1 on the downstroke and will 
develop 5:1 pressures under normal operation.

A grease pump has a ratio of 50:1. However it is capable 
of reaching a stall pressure equal to 60 times the air 
input pressure. To calculate the fluid output pressure 
using the air regulator reading, multiply the regulator 
gauge by 60. 

For example:

140 psi air x 60 = 8400 psi fluid output 
0.97 MPa air x 60 = 58.2 MPa
99.7 bar x 60 = 582 bar

Regulate air to the pump so that no air line or fluid line 
component or accessory is over pressurized.

1.

Close the air regulators and bleed-type master air 
valves to all but one pump.

2.

Open the master air valve from the compressor.

3.

For the pump that is connected, trigger the dispens-
ing valve into a grounded metal waste container 
making firm, metal-to-metal contact between the 
container and the valve. 

4.

Slowly open the bleed-type master air valve and 
open the pump air regulator just until the pump is 
running. When the pump is primed and all air has 
been pushed out of the lines, release the trigger.

5.

If you have more than one pump, repeat this pro-
cess for each pump in your system.

NOTE: When the pump is primed and has sufficient 
air supplied to it, it starts when the dispensing valve 
is open and shuts off when closed.

The equipment stays pressurized until pressure is 
manually relieved. To reduce the risk of serious injury 
from pressurized fluid, fluid from the valve, or splash-
ing fluid, follow this procedure whenever you:

•

are instructed to relieve pressure

•

stop dispensing

•

check, clean, or service any system equip-
ment

•

install or clean dispensing devices.