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Replacing the PRIME/SPRay valve
Perform the following procedure using PRIME/SPRAY valve
replacement kit P/N 800-915.
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 3/4” 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.
