Ryobi GS-400, Owner'S Operating Manual

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RELEASING PRESSURE

  1. To release pressure from the tank, turn the tank upside 

down, and then squeeze the flow control lever until all the 

air pressure is gone, or pull the pressure relief valve (13) 

until all air pressure is gone.

  2. If your sprayer is clogged and the pressure will not 

release using the flow control, do the following:

a. Place a rag over the top of the sprayer and pump.

b. While firmly pushing down on the pump handle, slowly 

turn counter-clockwise.

WARNING!

•  ALWAYS RELEASE pressure in sprayer before servicing.

•  NEVER leave pressurized sprayer unattended.

CLEANING

To prolong its life, clean the sprayer after each use. After using 

water-based products, rinse thoroughly with soapy water 

then clean water, being sure to flush out the hose and flow 

control. After spraying solvent or oil-based products, follow the 

chemical manufacturers’ recommended cleaning procedure, 

following up with a thorough rinsing and flushing of the sprayer, 

hose and flow control with soapy water then clean water.

WARNING! 

Do not store chemicals in the tank. If the chemical 

is stored in the tank, it can clog the system as it dries and 

destroy the seals and other components.

STORAGE

  1. Remove the complete hose assembly (hose w/siphon 

tube, wand, flow control) from the tank.

  2. For proper drainage and drying, lock flow control lever 

on.

  3. Loosen pump assembly, but leave in the tank.

  4. Store all components in a clean, dry area.

WARNING! 

Store  the  sprayer  in  a  safety  place  out  of 

Children’s reach.

PUMP MAINTENANCE & DISASSEMBLY

To keep the pump working smoothly and efficiently, the plunger 

o-ring needs to be lubricated often by applying grease or 

petroleum jelly around the outside of the plunger o-ring.
  1. Remove pump assembly from the tank.

  2. Unlock the pump handle and pull it out as far as it will go.

  3. With a flat blade screwdriver, push down on the tabs on 

each side of the pump. Pull up and the handle and the 

plunger assembly should come out of the pump cylinder.

•  To reassemble, insert the plunger assembly into the 

cylinder and snap the cap back into place.