H.E.R.O. H2K 3819 Owner's Manual - Prime Valve Service
Owner’s Manual
HK3819 / HK5523
Page 14
PRESSURE CONTROL CALIBRATION
If any component relating to pressure control is
repaired or replaced, a pressure calibration must be
performed. For illustration purposes, the gear
housing is shown without the cover and con-rod
assembly. The cover does not have to be removed to
set the unit pressure.
Tools Needed
50' nylon airless paint hose
gun with new .017 tip
4000 psi pressure gauge
Two 3/4" wrenches
flathead screwdriver
104
1.
Complete “Pressure Relief Procedures” as described on page 4
2.
Install pressure gauge at the connection between the paint hose and spray gun or pump outlet and hose.
3.
Place a 3/4” wrench on knob locking nut (Ref # 80).
4.
Place a cloth over control knob (Ref # 81) and use channel lock pliers to loosen the knob. NOTE: Knob is
secured with Loc-Tite 222. (Red)
5.
The top of the stem (Ref # 78) is machined with a slot, to allow for adjustments using flathead screw driver.
6.
Thread the pressure control stem down until the motor starts allow unit to prime.
7.
Close prime valve and allow unit to pressurize.
8.
Slowly turn the stem down until the maximum pressure (3000 psi) is achieved.
9.
Trigger the gun and check the maximum pressure, adjust as needed.
10. Once the maximum pressure is adjusted. Thread down the top nut (Ref # 80), making sure that the stem is
held securely with a screwdriver, until the nut contacts the housing.
11. Check the pressure of the unit again.
12. Thread the pressure control knob until it bottoms out on the nut , making sure that it is secured with
Loc-Tite # 222 (Red)
13. With a pair of channel lock pliers, gently tighten the knob on to the nut.
Removal
Place 5/8” wrench on flats of bleed valve housing (Ref # 65) and remove valve assembly from the manifold (Ref #
39).
Remove the seat (Ref # 60) and the Crush Washer (Ref # 59) from the manifold. Inspect for worn or damaged parts.
Drive the pin (Ref # 66) out of the valve lever (Ref # 67) and separate the knob from the stem.
Remove stem and spring from the valve housing. (Ref # 65)
Remove and replace stem seal (Ref # 61).
Installation
Repair kit is available to rebuild prime valve. Order part # HK-3600RK
Lubricate the seal and install the spring and stem in the reverse fashion. Install the knob and pin.
Flip lever to the open position to allow stem to move back, apply a liberal amount of grease to both sides of seat.
Place into end of housing, with the tapered end towards the ball. Add crush washer to the assembly. The grease will
hold the parts to gather while you thread the assembled parts into the manifold.
Tighten securely.
NOTE: The grease will be flushed out during the prime cycle on the next use.
PRIME VALVE SERVICE
Part # HK-3600