Graco A Series Instructions-Parts List Manual page 25

Problem
Packings are failing
frequently or f tl
prematurely. prematurely.
Strong surging at inlet
and low pressure on
discharge side.
Water spitting out of
thermal valve.
NOTE: For complete pump repair and design information, see web site: www.ARNORTHAMERICA.com
Cause
Scored, damaged, or worn plungers.
Abrasive material in fluid being pumped.
Inlet water temperature too high.
Overpressurizing pump.
Excessive pressure due to partially
plugged or damaged tip.
Pump running too long without spraying. Never run pump more than 10 minutes without
Running pump dry.
Foreign particles in inlet or discharge
valve or worn inlet and/or discharge
valves.
Pump running too long without spraying. Trigger gun to get fresh, cooler water in pump.
Solution
Install new plungers.
Install proper filtration on pump inlet plumbing.
Check water temperature. It should not exceed
160_F (70_C).
Do not modify any factory--set adjustments.
Clean or replace tip. See Installing and
Changing Spray Tips (page 16).
spraying.
Do not run pump without water.
Clean or replace valves.
25
309912