4250 Airless Sprayer™
ALWAYS wear safety goggles or protective eye-wear when operating the unit
!
4250™ Manual / 3947.0816
OPERATION
We recommend spraying with water first to become familiar with pump operation.
1.
Turn spray control (black knob) to the Prime/
re-circulating position (arrows in a circle) in line
with arrow on side of pump housing.
2.
Turn pressure control (gold knob) out (counter-
clockwise) several turns until it spins freely.
3.
Start Engine and throttle up to increase engine
speed and let pump run for 60 seconds.
4.
Turn pressure control knob in (clockwise) until it
stops. Liquid should flow back through return
hose. DO NOT OVER TIGHTEN
5.
Turn Spray Control knob to spray position.
(Spray gun symbol in line with arrow on side of
pump housing)
6.
Activate trigger and paint (or water) will spray
from the gun.
7.
Adjust pressure by turning pressure control
knob counter clockwise until spray pattern
decreases, then increase pressure by turning
clockwise just to where you get a good even
spray pattern.
8.
Adjust spray gun height for proper line width.
9.
When finished spraying or if machine will be left
unattended for any amount of time, turn Spray
Control Knob to Re-circulating Position, turn off
engine and pull spray trigger to release pressure
from the system.
OPERATIONAL NOTE!
NOTE: If pump does not prime, then back out the pressure control
knob several turns (counter clockwise) until loose. Leave spray
control knob in prime/re-circulating position and let pump run for
ONE MINUTE. Then turn the pressure control knob back in until it
stops. Push outlet button 3 times. Pump should now prime.
NOTE: If the pump primes and air bubbles continue to appear in the
return hose after one minute, the suction hose fitting may not be
tight enough or the rubber washer may be worn. Turn off machine,
turn spray valve to prime position and depress spray trigger to open
gun and release pressure.
Remove garden hose fitting at the inlet side of the pump, depress
inlet valve stem to make sure it is free, inspect washer to make sure it
is seated and in good condition. Re-attach garden hose fitting making
sure that it is hand tight. Start engine and repeat first steps for
operation.
