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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. Position the crankshaft/slider assembly at the bottom, dead-
center of its stroke so that the connecting pin and retaining
ring are visible below the slider assembly. This is done
by turning the sprayer on and off in short bursts until the
connecting pin is visible below the slider housing.
3. Turn off and unplug the sprayer.
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!
4. Remove the return hose from the hose clamp on the fluid section.
5. Loosen and remove the high-pressure hose from the fitting on
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.
Outlet Valve
Retainer
Nylon
Washer
Outlet Valve
Seat
Outlet Valve
Ball
Outlet Valve
Cage
Outlet Valve
Seal
Piston Rod
Upper
Housing
Lower
Housing
4. Using a 3/4” wrench, loosen and
remove the outlet valve retainer
from the piston rod.
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.
Repacking the Fluid Section
Cylinder
Connecting
Pin
Extension
Slider
Upper Seal
Retainer
Spacer
Upper
Packing
Lower
Packing
Upper
Housing
Piston Rod
Wear Ring
1. Remove the foot valve assembly
and the lower housing using the
steps in the “Servicing the Valves”
procedure above.
NOTE: The outlet valve does not
need to be disassembled
from the piston rod for this
procedure.
2. Turn the upper housing
counterclockwise to loosen it from
the cylinder.
3. Slowly pull down the upper housing
just far enough to expose the
extension slider and the connecting
pin that connects the piston rod to
the extension slider.
4. Push the connecting pin out of the
extension slider and piston rod
and remove the piston rod/upper
housing.
5. Place the upper housing upright in
a vise by clamping on the wrench
flats.
NOTE: Do not over-tighten the
vise. Damage to the upper
housing may occur.
6. Using a wrench, remove the upper
seal retainer.
7. Slide the piston rod out through the
bottom of the upper housing.
8. Inspect the piston rod for wear and
replace if necessary.
9. Remove the upper and lower
packings from the upper housing.
NOTE: Be careful not to scratch, score, or otherwise
damage the upper housing during removal of the
packings.
10. Clean the upper housing. Inspect the upper housing for
damage and replace if necessary.
11. Locate the new upper and lower packings and pack the areas
between the packing lips with grease. Lubricate the o-rings
on the exterior of the packings with grease.
Install upper packing
with raised lip
facing down.
Raised Lip
12. Insert the upper packing into the
top of the upper housing with the
raised lip on the packing facing
down.
13. Insert the spacer on top of the
upper packing.
14. Thread the upper seal retainer into
the upper housing and torque to 25-30 ft. lbs.
15. Pre-form the lower packing using the lower packing sizing
tool (included in the repacking kit).
Install lower packing with
the side that has the o-ring
closest to the face of the
packing facing up.
Closer
Top
16. Insert the lower packing partially
into the bottom of the upper
housing so that the side that has
the o-ring closest to the face of the
packing faces up.
17. Push the lower packing into
position using the lower packing
insertion tool (see Fluid Section
Assembly parts list for lower
packing insertion tool P/N).
18. Place the piston insertion tool (included in the repacking kit)
over the top of the piston rod.
