Troubleshooting - AIRLESSCO LP540 Hi Boy B Series Operation - Repair - Parts

Troubleshooting

Problem
Unit doesn't prime
Unit primes but has poor or no
pressure
Unit does not maintain good
spraying pressure
Unit does not run
Problem
Machine does not start
3A1190H
General
Cause
Airleak due to loose suction nut
Airleak due to worn o-rings
Airleak due to hole in suction
hose
Stuck or fouled balls
Pressure set too low
Filter(s) are clogged
Outlet valve fouled/worn.
Prime/pressure relief valve
bypassing
Packings and/or piston worn
Blown spray tip
Packings and/or pistons worn
Upper seat worn
Tripped Breaker
Electrical Failure
Electrical
Cause
Control Settings
Thermal Breaker
Pressure Control Assembly
(Board)
Solution
Tighten suction nut.
Replace o-ring (108526) on suction seat and
o-ring (867370) below suction seat.
Replace suction hose.
Service inlet and outlet valves.
Turn up pressure.
Clean or replace gun filter, inlet filter, and/or
manifold filter.
Service outlet valve.
Clean or replace prime/pressure relief valve
(866428).
Tighten packing nut, repack unit.
Replace spray tip.
Repack unit.
Replace upper seat.
Reset breaker
See Machine Does Not Start
Solution
Make sure machine is plugged into the wall.
Verify the on-off switch is in the ON position
and the pressure control knob is turned all the
way to the right (clockwise for maximum pres
sure).
Use multi-meter to test the breaker for continu
ity or replace with a new breaker. If breaker
reads good, see Power Source.
If the power indicating light is still out after
checking the control settings and power source,
replace the pressure control assembly.
Troubleshooting
17