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H4519 3 HP Air Compressor -17-
Motor runs
hot.
Pressure relief
valve stays
open and
motor won’t
stop running.
Air leaks from
pressure
switch.
Air is dirty or
has excessive
moisture.
1. Clean cylinder fins and motor area.
2. Inspect and clean air filter.
3. Do not allow the compressor to run over
its recommended duty cycle.
1. Turn compressor off, unplug from power
supply, drain tank. DO NOT USE until
switch is repaired or replaced.
2. Relief valve is relieving pressure too
early, test pressure relief and repair or
replace.
1. Clean dirt or debris from rubber mem-
brane of check valve after removing top
nut.
2. Repair or replace pressure switch.
1. Open drain cocks on both tanks and make
certain all condensation water is drained
out.
2. Remove delivery pipes, clean out and
replace.
PROBLEM
CAUSE
ACTION
1. Cooling fins dirty.
2. Air filter clogged.
3. Compressor is
exceeding its duty-
cycle.
1. Faulty pressure
switch, unit is trying
to overpressure the
tank.
2. Faulty pressure
relief valve.
1. Faulty check valves.
2. faulty pressure
switch.
1. Tank is not drained.
2. Delivery pipes are
dirty.