308-490 19
Pressure
Control
CAUTION
Do
not install the pressure control until motor is
checked. A defective motor may damage the pres
-
sure control. Make sure to test the motor prior to
pressure control installation.
WARNING
ELECTRIC SHOCK HAZARD
T
o reduce the risk of Electric Shock: wait
5 minutes after turning sprayer of
f before
servicing to allow stored current to dis
-
charge.
Motor Test
With
motor shield off and four motor leads discon
-
nected:
1.
Check continuity with multimeter from each black
motor lead to ground (one at a time). Any reading
less than infinite resistance – even very high re
-
sistance – means motor is shorted to ground. Re
-
place motor
.
CAUTION
A motor that is shorted to ground will damage the
pressure control.
2.
Remove fan cover from motor
.
3.
Remove pump pin ( See page 16 for instructions to
remove pin).
4.
With black motor leads not
connected, use motor
fan to spin motor quickly
. Motor should spin freely
in both directions. If not, replace motor
.
5.
Connect black motor leads together
.
6.
Use motor fan to turn motor
. It should be much
harder to turn than in step 4. If there is uneven or
no resistance to turning, check brushes and re
-
place if necessary
.
7.
If there is still uneven or no resistance to turning,
replace motor
.
8.
Install pump pin and fan cover
.
WARNING
INJECTION HAZARD
T
o reduce the risk of serious injury
,
whenever you are instructed to relieve
pressure, follow the
Pressure Relief
Procedure
on page 8.
1.
Relieve pressure.
2.
Remove ten screws (64) and motor shield (14).
See Fig. 15 and parts list.
3.
Loosen outlet cover on pressure control wiring box
and disconnect wires. See Fig 14.
4.
Loosen black conduit (22) from pressure control
fitting and pull out wires
5.
Remove hose (132), 45
swivel union (131), check
valve (42), and nipple (59) from rear of pressure
control (130).
6.
Remove hose (134) and 45
swivel union (131)
from front of pressure control (130).
7.
Support pressure control from falling(130) and
carefully remove motor mount screws (37). Re
-
move pressure control.
8.
Install new pressure control (130) with screws (37).
9.
Continue to reassemble sprayer
.
Fig 14
Black
Yellow
Red
Black
7145A
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