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H.E.R.O. INDUSTRIES 300S / 300SL LEGEND Owner’s Manual
20
TROUBLESHOOTING
SITUATION
POSSIBLE CAUSE (REMEDY)
PUDDLE OF OIL APPEARING UNDER SPRAYER DURING OPERATION
1. Hydraulic fitting loose/cracked or hydraulic lines are punctured. (examine all hydraulic lines and fittings
for cracks, breaks or looseness. Replace or tighten as required).
2. Piston seals (ref# 90) worn. (remove and replace piston seals, following closely the detailed instructions
on page 28-29).
CORRECT STATIC PRESSURE, BUT REDUCED SPRAYING PRESSURE
(Check with pressure gauge, see page 17 for details).
1. Spray tip worn out/too large. (replace with new, correct sized spray tip. Tip most not exceed a newer
condition .021 tip ).
2. Paint hose incorrect. (replace hose with genuine H.E.R.O. airless spray hose (min. 50 feet). Steel braided
hoses must not be used ).
3. Intake valve seat (ref# 12) worn. (replace intake seat closely following detailed instructions on page 23).
4. Intake ball (ref# 13) worn. (replace intake balls when signs of wear, deformation, nicks or cuts are
evident. An out of round ball is the sign of a worn intake seat, (ref# 12), and both items should be
replaced).
5. Outgo seat (ref# 25) worn. (replace seat).
6. Outgo ball (ref# 26) worn/damaged. (replace outgo ball).
7. Prime valve (ref# 34) bypassing. (start sprayer. With prime valve closed tightly, handle, (ref# 43), turned
clockwise fully, check prime valve return hose, (ref# 48), for material bypass. Repair prime valve using,
(ref# 47), if material is bypassing.
LOW STATIC PRESSURE, LOW SPRAY PRESSURE
(Check with pressure gauge, see page 17 for details).
1. Pressure control valve stem screw (ref# 79) loose. (remove pressure control knob, (ref# 74), and inspect
screw for looseness. Screw should be secured to stem, (ref# 78), with Loc-Tite. If the screw turns
independent of the stem than it must be re-secured. Secure unit so it will not move. Install pressure gauge
and .021 spray tip. Obtain a piece of wood, to use as a pusher or purchase a pressure control adjustment
tool, 27C-15. Remove pressure control screw and put some Loc-Tite 609 on threads. Turn the screw into
the stem a few turns and push it in to its maximum and read pressure. Turn the screw in or out until 3000
psi static pressure is obtained. If you obtain a pressure which higher than 3000 psi, trigger gun to release
some pressure and continue adjusting screw until correct pressure is obtained. Let Loc-Tite set up.
2. Pressure control ball (ref# 87) and/or seat (ref# 86) worn. (remove entire pressure control valve, (ref#
73), from sprayer. Remove valve seat, ball, retainer, (ref# 85), and spring, (ref# 84), from valve. Replace
with pressure control repair kit, (ref# 88). Hold valve body vertical while placing in spring, followed by
retainer. Retainer should be below the valve body (approx. 3/8") when positioned correctly. Center ball
on retainer, turn valve seat into body until finger tight, using pipe dope or Teflon tape to seal. Fully
tighten using wrench. See page 30.