24 Helix
GB
Servicing
9.5 Inlet and outlet valve
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 system before
servicing!
1. Remove the four screws in the front cover and then remove
the front cover.
Danger of crushing - do not reach with the ngers or
tool between the moving parts.
2. Turn the pressure control knob to minimum pressure. The
Control Display screen should say “PRIME”.
3. Press the #1 key on the Control Display 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 minimum pressure. The
crankshaft/slider assembly should stop.
6. Unplug the power plug from the outlet.
7. Loosen and remove the inlet valve housing (1) from the
cylinder (2).
8. Remove bearing ring (9), O-ring (8), O-ring (7), inlet valve seat
(6), inlet valve ball (5) upper ball guide (4) and spring (3).
9. Clean all the parts with the corresponding cleaning agent.
Check the inlet valve housing (1), inlet valve seat (6) and inlet
valve ball (5) for wear and replace the parts if necessary. If the
worn inlet valve seat (6) is unused on one side, install it the
other way around.
1
2
3
4
5
6
7
8
9
10. Screw out outlet valve housing (Fig. 21, item 10) from the
piston (11) with 3/8 inch hexagon socket head wrench.
11. Remove the upper seal (16), upper ball guide (15), outlet valve
ball (13), washer (14) and outlet valve seating (12).
12. Clean all the parts with the corresponding cleaning agent.
Check outlet valve housing (10), outlet valve seat (12), outlet
valve ball (13) and upper ball guide (15) for wear and replace
parts if necessary. If the worn outlet valve seat (12) is unused
on one side, install it the other way around.
13. Carry out installation in the reverse order.
14. If you plan to replace the uid section packings, move on to
section 8.6. If not, reassemble uid section in the reverse order
of how it was disassembled.
11
10
12
13
14
15
16
9.6 Packings
1. Remove inlet valve housing in accordance with the steps in
Section 8.5.
2. It is not necessary to remove the outlet valve.
3. Pull the lever on the underside of the sprayer toward the front
of the sprayer. This will un-clamp the entire uid section.
4. Slide the uid section forward to remove it from the gear
housing.
5. Place the uid section cylinder upright in a vise by clamping
on the wrench ats (Fig. 24, Item 2).
Do not over-tighten the vise. Damage to the cylinder
may occur.
6. Using a wrench, remove the upper seal retainer (Fig. 24, Item
3).
7. Slide the piston rod (4) out through the bottom of the cylinder
(1).
8. Inspect the piston rod for wear and replace if necessary.
9. Remove the upper support ring (8) and upper packing
assembly (5) from the top of the cylinder (1).
10. Remove the adapter (6) and lower packing assembly (7) from
the bottom of the cylinder.
Be careful not to scratch, score, or otherwise damage
the cylinder during removal of the packings.
