Section 6: ELECTRICAL
PA1553
43
4. Place insulating sleeve in inner side of the
field terminal stud hole in the end frame, and
insert the terminal stud through the sleeve.
Place two O-rings and insulating bushing
over the terminal stud and push into hole in
the end frame. Install insulating washer, flat
washer, toothed lock washer, and nut on
terminal stud. Tighten firmly.
5. Install each stator lead stud in the end frame
as follows: Place insulating washer over the
stud and insert the stud through the end
frame. Place the insulating bushing over the
stud and position in end frame hole. Install
flat washer, lock washer, and nut on the
stud. Tighten firmly.
6. Install three diode and support assemblies
on the end frame as previously directed
under “DIODE REPLACEMENT”.
7. Install a new seal in notch around end of the
stator frame. Insert field into the rotor and
position the end frame against the stator
frame. Attach end frame to the stator frame
with six bolts and lock washers. Tighten
bolts firmly.
8. If no other parts require replacement, refer
to "DIODE END COVER INSTALLATION" in
this section to complete the assembly.
7.6 STATOR REPLACEMENT
If tests performed under “Stator Winding
Checks” earlier in this section indicated an open
circuit or short in the stator, the stator and frame
assembly must be replaced.
7.6.1 Removal
1. Remove diode end frame and field
assembly as previously directed in steps 1
through 4 under “Field Removal”.
2. Remove the six bolts and lock washers
attaching the stator frame to the drive end
frame.
3. Separate the stator frame from the drive end
frame and remove the stator frame from the
end frame and rotor.
7.6.2 Soldering Stator Terminal Leads
1. Using a wire brush, thoroughly clean the
wire and terminal.
2. Silver solder the stator lead to the terminal
using a torch.
3. Thoroughly clean the silver solder
connection with a wire brush.
4. Using a high grade energized rosin flux,
coat the silver soldered connection with a
80-20 tin-lead solder or pure tin solder to
prevent deterioration of the silver solder by
engine oil.
NOTE
The silver solder will provide the required
mechanical strength, which will not be affected
by temperature. The tin-lead solder will protect
the silver solder connection from deterioration
by engine oil.
7.6.3 Installation
1. Position new seal in notch around the drive
end of the stator frame.
2. Position the stator and frame assembly over
the rotor against the drive end frame. Attach
the stator frame to the drive end frame with
six bolts and lock washers. Tighten bolts
firmly.
3. Install diode end frame and field assembly
as directed in steps 5, 6 and 7 under “FIELD
INSTALLATION”.
4. Install rectifier end cover as directed later.
7.7 DIODE END COVER INSTALLATION
1. Make sure all diodes are properly installed
and securely tightened. Leads from diodes
threaded into the end frame must be
securely attached to the diode supports. The
relay terminal lead must also be attached to
the left diode support.
2. Connect leads from the three diodes
mounted in supports to the output terminal
stud. Tighten the attachment screw firmly.
Place insulating bushing over relay terminal
stud.
3. Place a new seal in the diode end frame.
4. With the end cover in place against the end
frame, install the cap screws and lock
washers. Tighten the cap screws evenly and
firmly.
5. Make sure the drain plug is installed in
bottom of the end cover and securely
tightened.
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