SENTINEL II 5700
7
MAINTENANCE
• Replace motor brushes as necessary.
MOTOR BRUSH REPLACEMENT FOR THE SENTINEL II 5700
1.
Unplug unit to avoid the risk of electric shock.
2
. Remove plastic cooling fan cover on the top of the motor. Using a small
screwdriver, gently pry back the plastic fingers that hold cover to motor brush
housing.
3.
Remove the two Phillips screws and brush retaining bracket.
4.
Gently loosen and remove lead wire terminal from the brush’s nylon hous-
ing. With a small screwdriver, gent ly push the lead wire terminal toward the
commutator. If the terminal is stuck in the nylon housing, soften the top of the
brush with a heat gun or hair drier and then try to remove terminal. Remove
the brush.
5.
Place the new brush in position. Insert the lead wire terminal between the
nylon housing and the brass shell of the new brush.
6.
Push the brush into nylon housing and position into notch on motor hous-
ing. Replace the retaining bracket and the two screws.
7.
Replace cooling fan housing. If you break the retaining clips, you can
purchase a different type of retaining clip from Fogmaster.
TROUBLESHOOTING CHART
SYMPTOM
POSSIBLE CAUSE(S)
CORRECTIVE ACTION
No fan, no fog
No electrical power
Check power at outlet
No inlet pressure
Check pressure in liquid line
Power switch OFF
Turn ON
Brushes worn out
Replace brushes
Fan on, no fog
Possible liquid obstruction
Check metering valve
Bad pressure switch
Replace
Bad solenoid valve
Replace
Low inlet pressure
Increase pressure
Loose pressure sensor hose
Attach
Fan on, liquid spits
Excessive liquid feed pressure
Reduce to 5–15 psi
Motor stutters
Low inlet pressure
Increase pressure
Cover bowed in
Inlet air restriction
Enlarge lines or replace filters
Liquid plugging
Sentinel II 5700 nozzles do not contain any small orifices, so
plugging is not usually a problem. If an impurity in the liquid
obstructs the metering (needle) valve, note valve position from
vernier markings, temporarily open valve wide enough to pass
impurity, and readjust valve for desired droplet size.
