H.E.R.O. INDUSTRIES
1150GSD MANUAL - “B” VERSION
19
Replace or tighten as required).
2.
Piston seals (ref# 91) worn. (remove and replace piston seals, following closely the detailed
instructions on page 24-25).
CORRECT STATIC PRESSURE, BUT REDUCED SPRAYING PRESSURE
(Check with pressure gauge, see page 16 for details).
1. Spray tip worn out/too large. (replace with new, correct sized spray tip. Tip most not exceed a newer
condition .031 tip (for 1 gun) or .021 tip (for 2 guns)).
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# 13) worn. (replace intake seat closely following detailed instructions on page
23).
4. Intake ball (ref# 14) 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# 13), and both items should be
replaced).
5. Outgo seat (ref# 29) worn. (replace seat).
6. Outgo ball (ref# 30) worn/damaged. (replace outgo ball).
7. Prime valve (ref# 36) bypassing. (start sprayer. With prime valve closed tightly, stem,(ref# 46), turned
clockwise fully, check prime valve return hose, (ref# 51), for material bypass. Repair prime valve using,
(ref# 42), if material is bypassing.
LOW STATIC PRESSURE, LOW SPRAY PRESSURE
(Check with pressure gauge, see page 16 for details).
1. Pressure control valve stem screw (ref# 80) loose. (remove pressure control knob,(ref# 75), and inspect
screw for looseness. Screw should be secured to stem, (ref# 80), 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# 88) and/or seat (ref# 87) worn. (remove entire pressure control valve,
(ref# 74), from sprayer. Remove valve seat, ball, retainer,(ref# 86), and spring,(ref# 85), from valve.
Replace with pressure control repair kit,(ref# 89). 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.
TROUBLESHOOTING
SITUATION
POSSIBLE CAUSE (REMEDY)
FLUID BEING SPRAYED OUT OF TIP PULSATES, SPRAY HOSE LIES QUIET WHEN GUN
TRIGGER CLOSED
1. Spray tip worn out or too large. (replace with new tip of correct size. Tip must not exceed a single good
condition .031 tip or 2 .021 tips).
