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replacing the PrImE/SPray Valve
Perform the following procedure using PRIME/SPRAY valve
replacement kit P/N 700-248.
1. Push the groove pin out of the valve handle.
2. Remove the valve handle and the cam base.
3. Using a wrench, loosen and remove the valve housing
assembly.
4. Make sure the gasket is in place and thread the new valve
housing assembly into the filter block. Tighten securely with a
wrench.
5. Place the cam base over the valve housing assembly.
Lubricate the cam base with grease and line up the cam with
the filter block using the dowel pin.
6. Line up the hole on the valve stem with the hole in the valve
handle.
7. Insert the groove pin into the valve handle and through the
valve stem to secure the valve handle in position.
Gasket
Dowel Pin
Cam Base
Valve Stem
Filter
Housing
Valve Housing
Assembly
Valve
Handle
Groove Pin
Servicing the Fluid Section
Use the following procedures to service the valves and repack the
fluid section. Perform the following steps before performing any
maintenance on the fluid section.
1. Loosen and remove the four front cover screws. Remove the
front cover.
2. Set the pressure to minimum by turning the pressure control
knob to the “MIN” setting. The Digi-Trac™ screen should say
“PRIME”.
3. Press the #1 key on the Digi-Trac™ control panel. The “CREEP
MODE” screen will now appear.
4. Slowly turn the pressure control knob clockwise to increase
the pressure. The crankshaft/slider assembly will begin to
move very slowly.
5. When it reaches the bottom, dead-center of its stroke, turn
the pressure control knob back to the “MIN” setting. The
crankshaft/slider assembly should stop.
6. Turn the pump off and unplug the unit.
Before proceeding, follow the Pressure relief
Procedure outlined previously in this manual.
additionally, follow all other warnings to reduce the
risk of an injection injury, injury from moving parts
or electric shock. always unplug the sprayer before
servicing!
7. Remove the return hose from the clamp on the siphon tube.
8. Unscrew the siphon tube/siphon set from the foot valve.
9. Loosen and remove the high-pressure hose from the nipple
on the back of the upper housing of the fluid section.
Foot Valve
Housing
Viton
O-Ring
O-ring
PTFE
Back-Up
Ring
Foot Valve
Seat
Foot Valve
Ball
Foot Valve
Cage
Lower
Housing
Upper
Housing
Servicing the Valves
The design of the fluid section allows
access to the foot valve and seat as well
as the outlet valve and seat without
completely disassembling the fluid
section. It is possible that the valves may
not seat properly because of debris stuck
in the foot valve seat or outlet valve seat.
Use the following instructions to clean
the valves and reverse or replace the
seats.
1. Loosen and remove the foot valve
housing from the lower housing.
2. Clean out any debris in the foot
valve housing and examine the
housing and the foot valve seat.
If the seat is damaged, reverse or
replace the seat.
3. Using two wrenches, hold the
upper housing at the wrench flats
with one wrench and loosen the
lower housing with the other. Remove the lower housing.
4. Using a 3/8” wrench, loosen and remove the outlet valve
retainer from the piston rod.
Outlet Valve
Retainer
Nylon
Washer
Outlet Valve
Seat
Outlet Valve
Ball
Outlet Valve
Cage
Outlet Valve
Seal
Piston Rod
Upper
Housing
Lower
Housing
NOTE: always service the outlet
valve with the piston rod
attached to the pump. This
will prevent the piston
rod from rotating during
disassembly of the outlet
valve.
5. Clean out any debris and examine
the retainer and outlet valve seat.
If the seat is damaged, reverse or
replace the seat.
6. Remove, clean, and inspect the
outlet valve cage and outlet valve
ball. Replace if they are worn or
damaged.
7. Reassemble the valves by reversing
the steps above.
NOTE: During reassembly, make sure the Viton o-rings and
the PTFE back-up rings between the upper housing
and lower housing as well as between the lower
housing and the foot valve housing are lubricated
with grease and in position.
