Troubleshooting
313536U
19
Troubleshooting
Problem
Cause
Solution
Poor mixing
One or both sides of gun are clogged Clean the gun, see
on
page 16
One or both orifices may need to be
replaced
Hydraulic piston not opening fast
enough due to insufficient hydraulic
pressure
Verify hydraulic unit pressure and
accumulator charge
No fluid being dispensed
Insufficient pressure to move hydrau-
lic piston to the dispense position
Verify hydraulic unit pressure and
accumulator charge
Faulty proximity switch
Replace proximity switch
Damaged piston u-cup seals
Send gun to Graco for repair
Chemical crossover
Seal failure on piston rod
Send gun to Graco for repair
Hydraulic leak into divorce chamber
(hydraulic fluid found in purged
grease when greasing the gun)
Damaged seal u-cup
Send gun to Graco for repair
Proximity switch not working
Damaged proximity switch
Remove and test the switch, replace
as needed
Damaged proximity switch cord
Remove and test the cord, replace as
needed
Valve opens on power up
Air in hydraulic lines
Disconnect hydraulic hoses from
gun. Follow
on page 11.
