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Problem
Cause Solution
Packings are failing
freq entl or
Scored, damaged, or worn plungers Install new plungers.
frequently or
p
r
e
m
atu
r
e
l
y
Abrasive material in fluid being pumped Install proper filtration on pump inlet plumbing.
prematurely
Inlet water temperature too high Check water temperature. It should not
exceed 160_F (70_C).
Overpressurizing pump Do not modify any factory–set adjustments.
Excessive pressure due to partially
plugged or damaged tip
Clean or replace tip. See Installing and
Changing Spray Tips (page 12).
Pump running too long without spraying Never run pump more than 10 minutes without
spraying.
Running pump dry Do not run pump without water.
Strong surging at inlet
and low pressure on
discharge side
Foreign particles in inlet or discharge
valve or worn inlet and/or discharge
valves
Clean or replace valves.
Water spitting out of
thermal valve
Pump running too long without spraying Trigger gun to get fresh, cooler water in pump.
Note: For complete pump repair and design information see website: www.ARNORTHAMERICA.com