Graco LineLazer IV 250SPS, Repair Manual

Page: 45 / 54

Troubleshooting
3A2593C Repair 45
Low stall or run pressure shown on
display
Pressure setting too low.
Turn pressure adjusting knob clockwise to increase
pressure. See
operation manual .
New pump or new packings.
Pump break-in period takes up to 100 gallons
of material.
Faulty transducer. Replace transducer.
Excessive paint leakage into throat
packing nut
Throat packing nut is loose.
Remove throat packing nut spacer. Tighten throat
packing nut just enough to stop leakage.
Throat packings are worn or damaged. Replace packings. See manual 309277.
Displacement rod is worn or damaged. Replace rod. See manual 309277.
Fluid is spitting from gun
Air in pump or hose.
Check and tighten all fluid connections. Reprime pump.
See operation manual.
Tip is partially clogged. Clear tip. See manual 311254.
Fluid supply is low or empty.
Refill fluid supply. Prime pump. See operation manual.
Check fluid supply often to prevent running pump dry.
Excessive leakage around hydraulic
motor piston rod wiper
Piston rod seal worn or damaged. Replace hydraulic motor piston rod wiper and seal.
Sprayer overheats
Paint buildup on hydraulic components. Clean hydraulic components.
Hydraulic oil level is low. Fill with hydraulic oil. See operation manual.
Excessive hydraulic pump noise
Low hydraulic fluid level. Shut off sprayer. Add fluid*.
Pulleys loose on hydraulic pumps. Remove belt guard. Check and tighten loose pulley.
Display does not turn on
Main power switch is not turned ON. * Turn main power switch ON.
Key switch is not turned ON. ** Turn key switch to ON position.
Main fuse is blown. Replace fuse. See Fuse Replacement , page 33.
Cable between display and board disconnected
or damaged.
Reconnect or replace touch pad.
Display board failure. Replace display board.
Gallon (liter) counter not
adding fluid volume
Fluid pressure not high enough. Must be over 800 psi (55 bar) for counter to add.
Broken or disconnected wire.
Check wires and connections. Replace any broken
wires.
Missing or damaged magnet. Reposition or replace magnet.
Bad sensor.
Replace sensor. See Hydraulic Motor Replacement ,
page 20.
Distance not adding properly
(MEASURE mode will be inaccurate
and speed will be wrong)
Machine not calibrated. Perform calibration procedure. See Operation manual.
Rear tire pressure is too low or too high. Adjust tire pressure to 55 +/- 5 psi (380 +/- 34 kPa).
Gear teeth missing or damaged
(right side when standing on platform). Replace distance gear/wheel hub. See Rear Wheel
and Wheel Motors , page 40.
Distance sensor is loose or broken.
Reconnect or replace sensor. See Wheel Sensor
Replacement , see page 41.
Problem Cause Solution