Troubleshooting - Graco Mongoose Series Instructions - Parts Manual

Troubleshooting

Problem
Pump does not achieve or maintain
prime
Insufficient fluid
3A4131H
1. Follow Pressure Relief Procedure, page 9, before
Cause
Air trapped in inlet line
Worn or contaminated check valves
Excessive lift
Suction fittings not properly tightened Check fittings. Overtightening may
Split or pinch in inlet tube
Low chemical level
Stroke adjustment set too low
Worn or contaminated check valves
Obstruction in inlet line
Clogged foot valve screen
Output (system) pressure too high
Diaphragm worn or torn
Blown fuse
checking pump.
Straighten inlet line to eliminate high
spots.
Inspect check valves in fluid end for
cleanliness.
Verify the appropriate lift for the liquid
being pumped. Maximum suction lift
is 5 ft. with water or liquids of similar
specific gravity; though less with
heavier liquids, such as acids. Mount
the pump in a lower position relative
to the chemical container.
cause restriction. Conversely, if any
leakage occurs, the pump will suck
air and fail to prime.
Inspect inlet tube through its full
length to assure there are no splits at
the connections or other restrictions.
Move objects or equipment which
impinges upon the inlet tube, or
reroute as required to assure a
smooth transition from foot valve to
pump.
Check fluid level in chemical supply
tank.
Check operation of STROKE %
knob. If pump delivers too low adjust-
able rate, check settings. Readjust as
required.
Inspect, clean, or replace as neces-
sary.
Check inlet line for obstructions, clog-
ging, kinks, or pinch points.
Clean or replace foot valve screen.
Relocate the injector to a lower pres-
sure part of the system.
Replace diaphragm.
Replace fuse with like kind.
Troubleshooting
Solution
11