PROBLEM
IV. Electric motor runs, but no output
and pump not stroking
CAUSE
SOLUTION
1. Drive assembly damaged
1. Repair or replace.
V. Paint leaks into wet-cup
VI. Excessive surge (pulsing) at spray
1. Packing nut too loose
2. Throat packings worn or damaged
3. Damaged or worn piston rod
1. Filter partially clogged
2. Spray tip too big or worn
3. Paint too thick
4. Wrong type hose
5. Displacement pump check balls
or sticking
6. Displacement pump check balls and
packings worn or damaged
7. Pressure control or motor damaged
or pressure control out of
ment
1. Tighten just enough to stop
leakage.
2. Replace
See page 14.
3. Replace
See page 14.
1. Remove and clean.
2. Change tip.
3. Thin per paint manufacturer’s
recommendations.
4. Use minimum (15.2
grounded nylon hose; do not use
wire braid hose.
5. Flush, then remove and clean if
needed.
6. Replace. See page 14.
7. Check pressure control calibration,
repair or replace.
VII. Not enough paint pressure (See
Problem III also)
VIII. Poor spray pattern.
Pressure setting too low
2. Spray tip too big or worn
3. Pressure control or motor damaged
1. Clogged spray tip
2. Pressure setting too low
3. Outlet filter or hose partially clogged
4. Spray tip too big or worn
5. Paint supply low or pail empty
6. Paint too thick
Increase.
2. Change tip; see manual
3. Return for repair.
1. Clean. See manual
2. Increase.
3. Clean; see manual 367-273.
4. Change tip; see manual 367-321.
5. Fill;
to remove air.
6. Thin per paint manufacturer’s
recommendations.
IX. Spitting from spray gun
X. Static sparking from gun
1. Paint supply low or pail empty
2. Sprayer sucking air or gun needle
not seating
1. Sprayer or work not grounded
1. Fill,
to remove air.
2. Tighten fittings; repair gun; see
manual 307633.
1. Check hose continuity and electrical
ground connection.
(a) When a capacitor fails, the motor hums for about one minute, then shuts off the sprayer.
The motor will not operate when the motor thermal switch has opened. Engage the gun safety latch, allow the sprayer to
cool.
the sprayer continues to shut off, try reducing the spraying pressure, use a larger spray tip or add an additional
(15.2
of
spray hose. If the problem is not corrected, return the sprayer for repair.
,
Never leave water or water-based material in the sprayer to prevent damage caused by freezing if the air temperature is below
freezing, and to help prevent corrosion. Always leave the sprayer filled with mineral spirits or a compatible oil-based solvent.
The pressure control can be over-pressurized by: (1) using less than
ft (15.2
of nylon spray hose; (2) using wire braid hose;
adding a shutoff device between the pump outlet and spray gun; (4) plugging the main fluid outlet of the filter;
using the
drain valve as a shutoff device; (6) clogged or incorrectly assembled fluid filter.
3 0 7 - 4 6 0
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