C.E. Niehoff & Co. N1235, N7074 ADE Instructions

C. E. Niehoff & Co

.

BRUSHLESS ALTERNATORS

N7074

ADE Housing Assembly

for N1235 Alternators

Replacement Instructions

NOTICE

Do not cut field coil leads.
Reattachment will be rendered
impossible with shorter lengths
of leads.

Disassembly:

Anti-Drive End:

1. Remove ADE front cover plate, nut, washer.

2. The outer ring carrier and attached spiral ring
should remain inside the housing until the housing
is removed.

3. Remove silicone "plug" sealing the entrance on the
outside of the housing where the two field coil
leads enter the housing.

4. Remove the top cover plate on the ADE housing.

5. Carefully dig out the potting material inside the
control unit cavity with a blunt tool to not damage
the internal electrical components. The potting
should come loose in chunks. See Figure 1.
Remove enough potting to expose the terminal
block, the top two wires (field coil wires), and tube.
There will be another silicone "plug" sealing the
entrance of the plastic tube. The "plug" should be
removed.

6. Remove the two screws holding the red F+ and the
brown F- field coil leads to the terminal strip.

7. Carefully lift the field coil leads out of the potting.
Clean the field coil leads and terminals as much as
possible without damaging them. Then gently pull
them out of the tube from the outside entrance on
the front of the housing. See Figure 2. Ensure that
the leads are not damaged when pulling the forked
terminals through the tube.

8. Remove the phase leads from the diode studs on
the face of the ADE housing. Label each stud for
reattachment of phase leads.

9. Scribe marks at the joint of the ADE housing and
shell for reassembly.

10. Remove nuts from housing and separate the ADE
housing from the shell. Remove ADE bearing from
shaft and discard bearing.

11. Remove outer ring carrier located in front of the
bearing in the ADE housing from the inside out. If
carrier is stuck and spiral ring is lodged inside
bore, force the ring carrier out of the bore and save
ring carrier and spiral ring.

Red F+ field coil lead is
attached to the terminal
on the left of the brown
lead on terminal strip

Brown F– field coil lead is
attached to the middle terminal
on terminal strip

➛

➛

Figure 1 – Interior of Control Unit

Figure 2 – Field Coil Leads Removed

from Control Unit

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Assembly:

Anti-Drive End:

1. Install O-rings in grooves in inner bore of ADE
housing. Lubricate O-rings with DuPont™ Krytox®
GPL 225 or equivalent.

2. Lubricate inner ring carrier (on shaft land) with
DuPont™ Krytox® GPL 225 or equivalent.

3. Align scribe marks, then set ADE housing in
position, pulling phase leads and field coil leads
through vent holes in housing. Rotate shaft to
make sure phase leads or field coil leads do not
interfere with rotor.

4. Install locknuts on through-studs and use suitable
adhesive, such as Loctite® 222. Follow manufac­turer's instructions. Torque screws to 5.1 Nm/
45 lb. in. Before Loctite® sets, tap around face of
housing with plastic-headed hammer to set hous­ing against shell. Re-torque all screws.

5. Attach phase leads to diode studs as marked in
Disassembly step 8. Torque nuts to 3.4 Nm/
30 lb. in. Coat all diode studs with Dow Corning®
3140 RTV or equivalent. See Figure 3.

6. Press new ADE bearing into bearing bore at
bearing inner race. Wind cleaned spiral ring
around groove in outer ADE ring carrier. Lubricate
spiral ring with DuPont™ Krytox® GPL 225 or
equivalent. Set ring carrier into ADE bearing bore.

7. Fasten with hardened washer and locknut. Torque
to 65 Nm/50 lb. ft.

8. Feed field coil leads up through tube and into
control unit in housing. Fill inside of tube with
Dow Corning® 3140 RTV or equivalent until
silicone appears at bottom of tube. Smooth away
the excess silicone at bottom of tube, forming a
seal.

WARNING

9. Attach field coil leads to terminals as shown in
Figure 1 on page 1. Make sure all wires are
pressed inside cavity so that they will not be
exposed after cavity is filled with replacement
potting.

10. Fill the cavity inside the control housing with GE
Silicones® RTV11® silicone 2-part system (see
Figure 4):

a. Mix 37 drops of cure into 1/4 cup of RTV. Mix

well to prevent incomplete deep-set. At this
point, there is a half hour before mixture
thickens and two hours until mixture deep­sets.

b. Pour mixture into cavity until it reaches the top

of the old potting. Do not block opening on
side of control housing. Make sure all wiring is
covered with new potting material.

WARNING

11. Install ADE top cover plate. Torque screws to 4.5 ­5 Nm/40-45 lb. in.

12. When RTV has hardened, install ADE cover plate.
Torque screws to 4.5 - 5 Nm/40-45 lb. in.

Product warranty will be void if
tube is not sealed as indicated
in step 8.

Product warranty will be void if
cavity is not filled as indicated
in step 10.

Figure 3 – Phase Lead Connections

Figure 4 – Control Unit Filled with New Potting

C. E. Niehoff & Co. • 2021 Lee Street • Evanston, IL 60202 Tech Services Hotline [phone]

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