Ryobi GS-400, Owner'S Operating Manual

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PROBLEM CAUSE SOLUTION
Pump works hard or does not
pressurize the tank.
Plunger o-ring either not lubricated or
damaged.
Apply petroleum jelly or grease
around outside of plunger o-ring.
Check for cracks or other damage
and replace if necessary.
Spray solution or air leaks into pump
cylinder.
Check valve on bottom of cylinder
is prevented from sealing by dirt,
residue or damage.
Remove the pump assembly and
examine the check valve. Clean if
dirty; replace if necessary.
Hose leaks air at tank connection.
Tank nut is loose. Tighten hose tank nut.
Hose insert o-ring is damaged. Replace hose insert o-ring.
Flow control leaks. Improper assembly.
Refer to “Flow Control to Hose”
and “Wand to Flow Control”
assembly instructions.
Bad spray pattern or low spray
volume.
Nozzle is clogged.
Remove nozzle and clean; remove
wand and clean.
Low pressure in sprayer. Re-pressurize the tank.
Nozzle leaks when flow control is
closed.
Flow control remaining open (lever is
locked on).
Completely disassemble flow
control. Inspect all components,
clean and lubricate all seals or
replace flow control.
Leak at tank opening. Pump assembly not sealed tightly
into tank.
Thoroughly clean pump cylinder
gasket or o-ring and surrounding
area and apply grease or
petroleum jelly to pump gasket or
o-ring.
Damaged pump cylinder gasket or
o-ring.
Replace gasket or o-ring.
Fluid leaks from pressure relief
valve.
Tank is over filled.
Release pressure by following
“Releasing Pressure” instructions.
DO NOT USE the pressure relief
valve for releasing pressure.
Remove excess fluid.
TROUBLESHOOTING