TROUBLESHOOTING & REPAIR
F-84 F-84
RANGER 305D
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OUTPUT RECTIFIER BRIDGE AND CHOKE REMOVALAND REPLACE-MENT (continued)REMOVALPROCEDURE
1. Turn the engine off.
2. Remove negative battery cable.
3. Perform the Case Cover Removal pro-
cedure.
4. Perform the Chopper Module Capacitor
Discharge procedure.
5. Remove the four screws holding the case
front to the base of the machine.
6. Remove all plugs and leads from the weld
control and pull coil PC boards. Be sure
to mark the leads and plugs so they can
be properly re-connected. Seewiring dia-
gram.
7. Remove the screws holding the D4 diode
bridge and the CR1 engine protection
relay to the center baffle assembly, and
allow these components to remain
attached to the case front wiring.
8. Remove any additional wring and cable
ties as needed. Carefully mark leads for
accurate re-connection.
9. Swing the case front to the side to permit
access to the Output Rectifier and Choke.
Removing the Output Rectifier
10. Remove the heavy leads from the output
rectifier. Carefully mark the leads for
accurate re-connection, and also note
the order and position of multiple lead
connections.
11. Removethe nuts and lock washers hold-
ing the Output Rectifier to the mounting
bracket. You will need to reach through
the large access holes on either side of
the rectifier to reach these nuts.
12. Remove the Output Rectifier from the
machine.
Removing the Output Choke
1. Remove the heavy leads from the choke.
Carefully mark the leads for accurate re-
connection, and also note the order and
position of the leads in multiple lead con-
nections.
2. Remove the three long bolts, lock wash-
ersand nuts holding the choke the mount-
ing bracket in the machine base. Note
that there is no bolt in the lower right cor-
ner of the choke.
3. Carefully remove the choke.
REPLACEMENT PROCEDURE
Replacing the Output Choke
1. Place the choke into the machine so that
the three mounting holes in the choke line
up with the holes in the mounting bracket.
2. Insert the three long bolts through the
choke and the mounting bracket. Place a
lock washer and nut on the end of each
bolt and tighten.
3. Reconnect the choke leads. Position the
leads, bolts, washers, and nuts exactly as
they had been originally connected.
Tighten the connection securely.