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Replacing the Transducer
1. Loosen and remove the four front cover screws. Remove the front cover.
2. Stop the sprayer at the bottom of its stroke so that the piston is in its lowest position.
3. Perform the Pressure Relief Procedure and unplug the sprayer.
WARNING
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. Tilt the sprayer back for easy access to the fluid section.
5. Slide the retaining ring up on the slider assembly to expose the connecting pin.
6. Push the connecting pin forward through the slider assembly and piston. The connecting pin will fall into a recessed area of the gear box housing where it can be retrieved.
7. Using 3/8” a hex wrench, loosen and remove the two pump manifold mounting screws.
8. Pull the pump manifold down off of the gear box housing.
9. Remove the four heat sink assembly mounting screws.
Pull back the heat sink assembly for access to the transducer wire.
10. Follow the transducer wire from the transducer to the motor electronic control assembly and unplug the wire from the electronic control assembly.
11. Using a wrench, remove the transducer assembly from the pump manifold.
12. Thread the new transducer assembly into the pump manifold. Tighten securely with a wrench.
13. Plug the transducer wire into the motor electronic control assembly where the old transducer wire was located.
14. Reassemble the pump by reversing steps 1–8.
CAUTION
Make sure the transducer is aligned properly with the hole in the pump manifold during reassembly. Improper alignment may cause damage to the transducer o-ring.
Heat Sink
Assembly
Heat Sink
Assembly
Screw
Front
Cover
Screw
Front
Cover
Transducer
Assembly
Connecting Pin
Retaining Ring
Gear Box
Housing
Slider
Assembly
Pump
Manifold
Pump
Manifold
Mounting
Screw
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 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. Perform the Pressure Relief Procedure and unplug the sprayer.
WARNING
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. For Upright Cart units, remove the return hose from the hose clip on the siphon tube. Unscrew the siphon tube from the inlet valve housing.
5. For Low Boy cart units, remove the retaining ring from the bottom of the inlet valve housing using a snap ring pliers.
Remove the return hose clamp and pull the return hose from its fitting on the pump manifold. Remove the suction set assembly.
6. Loosen and remove the high-pressure hose from the outlet fitting on pump manifold.
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 foot valve seat or outlet valve seat. Use the following instructions to clean the valves and reverse or replace the seats.
Pump
Manifold
Piston
Bushing
Nylon
Washer
Inlet Valve
Cage
Inlet Valve
Ball
1. Using a wrench, loosen and remove the inlet valve housing from the pump manifold.
2. Clean out any debris in the inlet valve housing and examine the valve housing and seat. If the seat is damaged, reverse or replace the seat.
Inlet Valve
Seat
PTFE
O-Ring
Inlet Valve
Housing
3. Using a 3/8" hex wrench, loosen and remove the outlet valve retainer from the piston rod.
Piston Rod
NOTE: Always service the outlet valve with the
Outlet Valve
Seal piston rod attached to the pump. This
Outlet Valve
Cage will prevent the
Nylon Washer piston rod from rotating during
Outlet Valve
Ball disassembly of the outlet valve.
Outlet Valve
Seat
4. Clean out any debris and examine the valve housing and seat. If the seat is damaged, reverse or replace the seat.
Outlet Valve
Retainer
5. Remove, clean, and inspect the outlet valve cage and outlet valve ball. Replace if they are worn or damaged.
6. Reassemble the valves by reversing the steps above.
10 © SprayTECH. All rights reserved.
Repacking the Fluid Section
1. Remove the inlet valve assembly 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. Slide the retaining ring up on the slider assembly to expose the connecting pin.
3. Push the connecting pin forward through the slider assembly and piston. The connecting pin will fall into a recessed area of the gear box housing where it can be retrieved.
4. Using 3/8” a hex wrench, loosen and remove the two pump manifold mounting screws.
5. Pull the pump manifold down off of the gear box housing.
Slider Assembly
Connecting Pin
Retaining Ring
Retainer Nut
Piston Guide
Upper Packing
Assembly
Pump Manifold
6. Slide the piston rod out through the bottom of the pump manifold.
7. Loosen and remove the retainer nut and piston guide from the pump manifold.
Pump Manifold
Mounting Screw
Lower Packing
Assembly
Piston Rod
8. Remove the upper and lower packings from the pump manifold.
9. Clean the pump manifold and install the new upper and lower packings. Refer to the illustration below for proper packing orientation.
Large Beveled Edge
Install upper packing with raised lip
facing down.
15. Slide the retaining ring down over the connecting pin.
CAUTION
Make sure the transducer is aligned properly with the hole in the pump manifold during reassembly. Improper alignment may cause damage to the transducer gasket.
16. Thread the pump manifold mounting screws through the pump manifold and into the gear box housing. Tighten securely.
17. Reassemble the inlet valve assembly into the pump manifold.
18. For Upright Cart units, thread the siphon tube into the inlet valve and tighten securely. Make sure to wrap the threads on the down tube with
PTFE tape before assembly. Replace the return hose into the hose clip on the siphon tube.
19. For Low Boy cart units, insert the elbow on the suction set assembly into the bottom of the inlet valve housing. Push the retaining ring up into the groove inside the inlet valve housing to secure the suction set assembly in position.
Push the return hose onto the return hose fitting on the pump manifold and secure in position with the return hose clamp.
20. Place the front cover on the gear box housing and secure in position using the four front cover screws.
21. Turn on the sprayer by following the procedure in the
“Operation” section of this manual and check for leaks.
NOTE: Repacking kit P/N 0551677 is available. For best results use all parts supplied in this kit.
Install lower packing with large beveled edge facing up.
Raised Lip
10. Inspect the piston rod for wear and replace if necessary.
11. Insert the piston guide into the retainer nut. Thread the retainer nut into the pump manifold until it is hand tight.
12. Slide the piston guide tool (included in the repacking kit) over the top of the piston rod and insert the piston rod through the bottom of the pump manifold. Using a rubber mallet, tap the bottom of the piston rod lightly until the piston rod is in position in the pump manifold.
NOTE: Coat the piston guide tool and the piston rod with grease before inserting them into the pump manifold.
13. Using a wrench, tighten the retainer nut securely.
14. Position the pump block underneath the pump housing and push up until it rests against the pump housing.
When the connecting pin hole on the piston rod lines up with the hole in the slider assembly, insert the connecting pin.
© SprayTECH. All rights reserved.
11
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