AIRLESSCO GS6250 - Manual (Page 15)

Maintenance
3A1187E 15
11. Take the upper female gland and place on top of the
assembled upper packings with the inverted side
down.
12. Take the assembled upper glands and packings (7
pieces) and slide over the top of the piston, making
sure the inverted sides are facing down.
13. Take the V-packing holder and replace the white
O-ring and the black O-ring with new ones form the
packing kit.
14. Slide the V-packing holder over the top of the upper
packings so they fit inside.
15. Lubricate the inside of the fluid pump body and the
outside of the packings with a lightweight oil.
16. Slide the completed assembly into the fluid pump
body.
NOTE: To keep packings secured in the correct position,
hold the pump body upside down and push the com-
pleted assembly upwards into the pump body. Once
placed inside, tilt the pump body back up to keep all
pieces.
17. Thread the packing nut into the top of the fluid body
and tighten hand tight.
18. Take the suction retainer and replace the black
O-ring with a new one from the packing kit. Replace
the suction ball with the new one from the kit into the
suction retainer. Place the suction seat into the flat
side of the ball guide, over the suction ball. Now
place the white O-ring into the groove around the
suction seat.
19. Take the completed suction valve assembly and
place it into the bottom of the fluid body, with the
rounded side fitting inside.
20. Take the suction seat support and place the flat side
down on the suction valve assembly (threads will be
facing upwards).
21. Thread the suction nut, over the suction seat sup-
port.
22. Tighten the packing nut (utilizing the packing nut
adjustment tool) clockwise one full turn.
Replacement of Electrical
Control Board
1. Remove electrical cover.
2. Disconnect sensor lead from Electrical Board.
3. Disconnect two clutch leads on Electrical Board
from leads on clutch.
4. Using a 1/16” allen, loosen set screw in Pressure
Control Knob and remove knob.
5. Using a 1/2” nutdriver or 1/2” deep socket, remove
nut from pressure control shaft. This will allow
removal of electrical control board from frame.
6. Replace Electrical Board Assembly in reverse order.
Adjust pressure. See Pressure Calibration of the
Electrical Control Board, page 15.
Pressure Calibration of the
Electrical Control Board
1. Turn “Pressure Calibration” Trimpot adjustment on
electrical control board in the counter clockwise
direction at least 15 revolutions.
2. Connect 5000 psi glycerine pressure gauge on out-
let of pump between fluid pump and airless hose to
monitor Fluid Pump Pressure.
3. Start engine and run at maximum RPM. Turn prime
Valve to open (Prime) position. Turn Pressure Con-
trol Knob to maximum position (fully clockwise).
4. Using an insulated screwdriver adjust “Pressure
Calibration” Trimpot by turning clockwise until the
clutch engages. When the clutch engages the pump
will commence Priming. When pump is primed, turn
the Prime Valve to the Closed (Pressure) Position.
NOTE: The pump will begin to pressurize and the clutch
will disengage at a low pressure. Continue turning the
trimpot clockwise to increase pressure 3000 psi.
5. Trigger gun. The pressure should drop approxi-
mately 350-400 psi, the clutch will engage and build
pressure to 3000 psi and disengage. Trigger gun
several times to ensure proper pressure setting.
6. Turn Pressure Control Knob to minimum position.
The clutch should disengage and pump stop mov-
ing.