Graco ULTRA 500 Instructions-Parts List Manual page 23

POWER SUPPLY CORD REPLACEMENT
WARNING
Before doing this procedure, follow the Pressure
the risk of a fluid injection injury, injury from mov-
Reilef Procedure Warning on page 13 to reduce
1. Remove the pressure control cover and screws.
2 . Disconnect the power supply cord lead from the
ONlOFF switch (302), the white wire going to the
screw (343) and lockwasher (327). See Fig 15.
bridge
(W),
and the green wire to the grounding
3. Loosen the attain relief bushing (328). Remove the
power supply cord
(31 1
).
4. Install the new cord in the revem order of
disassembly.
5.
Reinstall the cover end screws.
343,3271
328
Fig 16
ON/OFF SWITCH REPLACEMENT
1.
Remove the pressure control cover end screws.
2 . Use e needle nose pliers to disconnect the upper
terminal wire from the microswitch (302) for ease in
removing the ONlOFF switch (303). Refer to Fig
15.
3. Use the pliers to disconnect the
two black wires
from the ONlOFF switch (303). Refer to
Fig
15.
-
4. Use a 518" socket wrench to loosen and remove
the nut and rubber boot (304) from the top of the
pressure control box. Remove the switch guard
(305).
See Fig
16.
5.
Remove the ON/OFF switch.
CONTROL BOX
6. Install the new switch so the internal tab of the anti-
rotation ring (W) engages with the, vertical groove
in the threads of the switch, and the external tab
trol box. See Fig 16.
engages with the blind hole ID) of the pressure con-
7. Install the switch guard (305). aligning the internal
tab with the groove in the threads. See Fig 16.
8. Install the nut and rubber boot (304) and.tighten.
See Fig 16.
9. Reconnect the wires to the ONlOFF switch ( 3 0 3 1
303
Rg 16
and reconnect the wire to the microswitch (302);
Refer to Fig
15.
10. Reinstall the pressure control cover and screws.