BEFORE COMMENCING ANY WORK ON THE SPRAYER, ALWAYS OPERATE THE TRIGGER VALVE TO ENSURE THERE IS NO RETAINED PRESSURE IN THE SYSTEM WHICH COULD CAUSE YOU TO BE SPLASHED WITH CHEMICAL.

It is recommended to occasionally lubricate the plastic piston guide bush Pt No. 511950 in the top of the container and the piston ‘O’ ring Pt No. 606740 with petroleum jelly. To remove the pump for this purpose, unscrew the plastic wing nut, Pt No. 511930 which secures the hose Pt No. 513590 and the pump retaining plate Pt No. 511920. This operation is made easier by turning the trigger and lance at the same time. The metal pump operating yoke can then be lifted off the top of the piston and the pump can be withdrawn. When the piston ring has been lubricated, the parts should be replaced in the reverse order.

If the trigger valve Pt No. 726004 becomes stiff to operate, the action will be improved by lubricating the valve spindle Pt No. 607472. This can be removed from the trigger valve body, after first unscrewing the cap Pt No. 536900.

CLEANING THE TRIGGER VALVE FILTER

There is a filter, Pt No. 613320 in the handle of the trigger valve to prevent nozzle blockages. Symptoms indicating that the filter is itself blocked are when a poor, weak, spray pattern occurs whilst the tank has liquid, the pump appears to be creating pressure and the nozzle is clear. The filter can be removed for cleaning by unscrewing the hose connection fitting, Pt No. 538600.