AIRLESSCO LP500 - Manual (Page 11)

Maintenance
3A1185H 11
Shutdown
1. Relieve Pressure, page 8.
2. Clean the tip and gun as recommended in the sepa-
rate Gun Manual supplied with the gun.
3. If spraying water-based material or a material that
could harden in the sprayer overnight, flush the
sprayer after use. See Flushing, page 9.
Storage
Short Term
1. Flush sprayer with compatible solvent before stor-
ing, then fill the pump and hoses with an oil based
solvent such as mineral spirits.
• For oil base paint: flush with mineral spirits
• For water-base paint: flush with water, then min-
eral spirits and leave the pump, hose and gun
filled with mineral spirits.
Long Term
For longer storage, use Graco Pump Armor or mineral
spirits. Shut off sprayer, Relieve Pressure, page 8, and
make sure prime/pressure relief valve is left open.
Start Up After Storage
Before using water-base paint, flush sprayer with soapy
water and then a clean water flush. When using oil-base
paint, flush out the mineral spirits with the material to be
sprayed.
NOTE: Always store unit indoors.
Maintenance
Daily Maintenance
1. Keep the displacement pump packing nut/wet cup
lubricated with Airlessco TSO (Throat Seal Oil) at all
times. The TSO helps protect the rod and packings.
2. Inspect the packing nut daily. If seepage of paint
into the packing nut and/or movement of the piston
upward is found (while not spraying), the packing
nut should be tightened just enough to stop leakage.
Overtightening will damage the packings and
reduce the packing life.
Electric Motor Maintenance
Lubrication
The motor is supplied with pre-lubricated ball bearings,
lubricated for the life of the bearing.
Motor Brushes
Motor brushes need periodic inspection and replace-
ment as wear indicates. Standard brushes have an ini-
tial length of 1” and should be replaced when they are
worn to a length of 1/2”. Brush wear is greatly influenced
by individual application and it is recommended that
brush wear be checked at early intervals of operation in
order to determine future required inspection.
To change the brushes:
1. Unplug the machine.
2. Remove the cover over the motor, if applicable.
3. Open the two covers at the rear of the motor.
4. Disconnect the brush wire.
5. Pull out the wire.
6. Push the brush retainer clip in and withdraw.
7. Remove the worn brushes.
8. Install new brushes in the reverse order.
To increase brush life, new brushes (Part #331780)
need to have a run in period. After changing brushes,
set the machine for spraying. With a bucket of Pump
Conditioner and water, a 50’ 1/4” airless hose, airless
gun and tip on unit, open the prime/pressure relief valve
and switch on. The pump will now prime. With pump
running in the prime mode, turn the pressure control
knob to high pressure. (The pump has to cycle fast with
no pressure in the pump). Run the pump for 20 minutes
and the brushes will be run in.
Brush Kit
331780
ti16051a