Graco FieldLazer R300 Repair And Parts

Troubleshooting
10 311020Y
Gallon counter not working Broken or disconnected wire Check wires and connections. Replace
broken wires.
Bad sensor Replace sensor
Missing magnet Reposition or replace magnet.
Sprayer operates, but display does not Bad connection between control board
and display
Remove display and reconnect
Display damaged Replace display
Distance counter not operating properly Trigger sensor not set correctly See “Spray icon does not show on display
when fluid is sprayed”
Bad wiring connections Check connector, and reconnect
Distance sensor not spaced correctly
from gear
Adjust space between sensor and gear to
.050 --/+ .020 in. See page 19.
Distance sensor and gear not aligned Remove tire, and press in or pull out gear to
align sensor and gear.
Gear teeth missing or damaged. Replace distance gear/wheel
Wire cracked or broken Replace sensor
Miles not calculating Distance sensor See “Distance counter not operating
properly”
Trigger sensor See “Spray icon does not show on display
when fluid is sprayed”
Gallon counter See “Gallon counter not working”
Bad or damaged control board Replace control board
Fluid spray starts after spray icon is
shown on display
Interrupter (164) is improperly positioned Turn screw (126) counterclockwise until
spray icon synchronizes with fluid spray
Fluid spray starts before spray icon is
shown on display
Interrupter (164) is improperly positioned Turn screw (126) clockwise until spray icon is
synchronized with fluid spray
Spray icon does not show on display
when fluid is sprayed
Loose connector Check connector and reconnect
Interrupter (164) is improperly positioned Turn screw (126) counterclockwise until
spray icon synchronizes with fluid spray
Reed switch assembly (166) is damaged Replace reed switch assembly (166)
Magnet on assembly (166) is missing Replace reed switch assembly (166)
Cut or sliced wire Replace distance sensor harness (66)
Control board is damaged Replace control board
Display is damaged Replace display
Interrupter (164) is improperly positioned Turn screw (126) clockwise until spray icon is
synchronized with fluid spray
Reed switch assembly (166) is damaged Replace reed switch assembly (166)
Problem Cause Solution

Graco FieldLazer R300 Specifications

General

Brand	Graco
Model	FieldLazer R300
Category	Construction Equipment
Language	English