Servicing The Fluid Section - SprayTECH GPX 85 Notice D'utilisation

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 sprayer 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.
note: Keep the sprayer in
the upright position for
this procedure.
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.
note: If the inlet valve seat is reversed or replaced, the
inlet valve ball must be replaced.
3. Using a 3/8" hex 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.
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.
note: If the outlet valve seat is reversed or replaced,
the outlet valve ball must be replaced.
5. Remove, clean, and inspect the outlet cage and outlet
valve ball. Replace if they are worn or damaged.
6. Reassemble the valves by reversing the steps above.
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Repacking the Fluid Section
1. Remove the foot valve assembly using the steps in the
"Servicing the Valves" procedure above.
note: the outlet valve does not need to be
2. Using 3/8" a hex
wrench, loosen and
remove the two
pump block mounting
screws.
3. Pull the pump block
down approximately
1/2" from the gear
box housing.
4. Slide the pump
block and piston
rod forward until the
piston rod is out of
the T-slot on the
slider assembly.
5. Slide the piston
rod out through the
bottom of the pump
block
Fluid Section 6. Loosen and remove
Housing
the retainer nut and
piston guide from the
Piston Bushing
pump block.
Inlet Cage
7. Remove the upper
Inlet Valve Ball
and lower packings
from the pump block.
Inlet Valve Seal
8. Clean the pump block.
Inlet Valve Seat
9. Locate the new upper and lower packings and pack the
PTFE O-Ring
areas between the packing lips with grease. Lubricate the
Inlet Valve
o-rings on the exterior of the packings with grease.
Housing
10. Inspect the piston rod for wear and replace if necessary.
11. Insert the upper packing into the top of the pump block
with the raised lip on the packing facing down.
12. Insert the piston guide into the retainer nut. Thread the
retainer nut into the pump block until it is hand tight.
13. Pre-form the lower packing using the lower packing sizing
tool (included in the repacking kit).
14. Insert the lower packing partially into the bottom of the
pump block so that the side that has the o-ring closest to
the face of the packing faces up.
Install upper packing
Piston Rod
Upper Seal
Upper Cage
Nylon Washer
Outlet Valve
Ball
15. Push the lower packing into position using the lower
packing insertion tool (see Fluid Section Assembly parts
Outlet Valve
Seat list for lower packing insertion tool P/N).
16. Inspect the piston rod for wear and replace if necessary.
Outlet Valve
Retainer
note: coat the piston guide tool and the piston rod
17. Place the piston insertion tool (included in the repacking
kit) over the top of the piston rod.
18. Insert the piston rod into the bottom of the pump block,
through the lower packing, through the upper packing, and
out through the retainer nut. Using a rubber mallet, tap
13
disassembled from the piston rod for this
procedure.
with raised lip
facing down.
Raised Lip
with grease before inserting them into the pump
block.
English
Retaining Ring
Retainer Nut
Piston Guide
Upper Packing
Assembly
Pump Manifold
Pump Manifold
Mounting Screw
Lower Packing
Assembly
Piston Rod
Large Beveled Edge
Install lower packing
with large beveled
edge facing up.