Servicing the Fluid Section
Use the following procedures to service the valves and repack
the fluid section.
1. Using a Phillips screwdriver, remove the four front cover
screws. Remove the front cover.
2. Start the engine (refer to the procedures in the Operation
section of this manual). Turn the pressure control knob
clockwise to its maximum pressure setting.
3. Toggle the pump ON/OFF switch between the ON and
OFF positions in short bursts until the slider assembly and
piston rod stop at the bottom of their stroke (in their lowest
position).
4. Turn off the engine and perform the Pressure Relief
Procedure.
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.
Servicing the Valves
The design of the fluid section
allows access to the inlet 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
inlet valve seat or outlet valve
seat. Use the following
instructions to clean the valves
and reverse or replace the seats.
1. Using a wrench, loosen and
remove the inlet valve
housing from the fluid
section housing.
2. Clean out any debris in the inlet valve housing and
examine the valve housing and seat. If the inlet valve
seat is damaged, reverse the seat to the unused side or
replace the seat.
3. Using a 3/8" hex wrench, loosen and remove the outlet
valve retainer from the piston rod.
4. Clean out any debris and
examine the outlet valve retainer
and seat. If the outlet valve seat
is damaged, reverse to the
unused side or replace the seat.
5. Remove, clean, and inspect the outlet cage and outlet
ball. Replace if they are worn or damaged.
6. Reassemble the valves by reversing the steps above.
NOTE: If the outlet valve seat is reversed or replaced,
the outlet ball must be replaced.
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.
Piston Rod
Outlet Cage
Outlet Valve
Seat
Outlet Valve
Retainer
Outlet Ball
NOTE: If the inlet valve seat is reversed or replaced,
the inlet valve ball must be replaced.
NOTE: Keep the sprayer in
the upright position
for this procedure.
Fluid Section
Housing
Inlet Valve Seal
Inlet Valve Seat
PTFE O-Ring
Inlet Valve
Housing
Piston Bushing
Inlet Cage
Inlet Valve Ball
Repacking the Fluid Section
1. Remove the inlet valve
and outlet valve
assemblies using the
steps in the “Servicing
the Valves” procedure
above.
2. Using a 11/16” open-end
wrench, loosen and
remove the fluid hose
from the fitting on the
back of the fluid section.
3. Using a 3/8” hex wrench,
remove the two socket
screws that secure the
fluid section to the pump
housing.
4. Remove the fluid section
by pulling it straight down
from the pump housing
until the dowel pins on the
pump housing disengage
form the fluid section
housing. Then, pull the
fluid section forward to
disengage the piston from
the T-slot on the slider
assembly.
5. Slide the piston rod out
through the bottom of the
fluid section housing.
6. Using a wrench, loosen
and remove the retainer
nut and piston guide from
the fluid section housing.
7. Remove the upper and
lower packings from the
fluid section housing.
8. Clean the fluid section housing thoroughly
9. Locate the new upper and lower packing assemblies.
Remove the piston insertion tool from the upper packing
and the seal sizing tool from the lower packing.
10. Pack the areas between the
packing lips with grease
(included in repacking kit).
Lubricate the o-rings on the
exterior of the packings with
grease.
11. Insert the upper packing
assembly into the top of the
fluid section housing with the raised lip facing down into
the housing.
12. Insert the lower packing
assembly into the bottom of the
fluid section housing with the
large beveled edge facing
toward the housing (beveled
edge will be facing up when
the housing is upright).
13 Inspect the piston rod for wear
and replace if necessary.
Install lower packing so
large beveled edge will
be facing up when the fluid
section housing is upright.
Large Beveled Edge
Install upper packing
with raised lip
facing down.
Raised Lip
NOTE: Be careful not to scratch, score, or otherwise
damage the inside of the fluid section housing
during removal of the packing assemblies.
Slider
Assembly
Retainer
Nut
Piston
Guide
Fluid
Section
Housing
Upper
Packing
Lower
Packing
Socket
Screw
Piston
Rod
Fitting
T-Slot
NOTE: The factory-installed packings are red in color.
The replacement packings in the packing
replacement kit are white.
© Titan Tool Inc. All rights reserved. 13
