Graco ULTRA 1000 Instructions-Parts List Manual page 19

SPIN TEST
WARNING
Relief Procedure Warning on page 1 3 to reduce
Before doing this procedure, follow the Pressure
the risk of a fluid injection injury, Injury from mov-
ing parts, or electric shock.
trical continuity.
For checking armature, motor winding and brush elec-
Setup
cribed in "Drive Housing Replacement", Steps 1-6,
Remove the drive housing from the sprayer as des-
page
29.
Remove the pressure control cover and screws, the
covers
(J).
See Fig
10.
motor cover, the fan cover (F), and the inspection
1308). See Fig 11.
Disconnect the two leads from the motor to the bridge
Armature Short Circult Test
shorts, the motor will coast two or three recolutions
Quickly turn the motor fan by hand: if there are
no
before coming to a complete stop.
armature is shorted and the motor must be replaced.
If the motor does not spin freely and resists rotation, the
See page
3 0 .
. .
Armature, Brushes, and Motor, Wiring Open
Circuit Test IContinuItyl
Connect the two black motor leads together with a test
lead.
Turn the motor fan by hand a t about
two
revolutions
per second.
If there is uneven or no turning resistance, check the
following: a) broken brush springs; b) broken brush
leads; c) loose brush terminal screws; dl worn brushes:
e) broken motor leads; f) loose motor lead terminals.
Repair parts as needed. See page
2 2 .
the motor. See page 30.
If there is s t i l l uneven
or
no turning resistance, replace
Flg 10
309
308
Fig 11
307-786 19