C.E. Niehoff & Co. N1224-1 Installation

N1224-1, -5, -6 Alternator w/N3221 Regulator

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N1224-2 Alternator w/N3229 Regulator

N1224-3, -4 Alternator w/N3232 Regulator

N1224 Alternator

Installation Instructions

This symbol is used to indicate

CAUTION

presence of hazards that can cause
minor property damage.

Install alternator as shown in Figure 1:

Slip bushing located in rear mounting

CAUTION

foot must be securely tightened against
alternator mounting bracket on engine.
Failure to do so can result in broken
mounting feet or broken upper mounting
bracket.

1. Units without pulleys are shipped with shaft collar,
disc spring washer, and nut. Remove shaft collar.
Install pulley (specified by customer), disc spring
washer, and nut. Torque nut to 163 Nm/120 lb. ft.

2. Use hardened washers between aluminum surfaces
and mounting bolt heads and nuts. Torque mounting
bolts as shown in Figure 1.

14 V B+ terminal stacking order:

—10 mm x 1.5 bolt

—disc spring washer

—customer 14 V output terminal

Torque to 15 Nm/11 lb. ft.

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28 V B+ terminal
stacking order:
—10 mm x 1.5 bolt
—disc spring washer
—customer 28 V output
terminal
Torque to 15 Nm/
11 lb. ft.

3. All cabling, wiring or conduit must be supported
within 300 mm/12 in. of termination on alternator.

4. Choose wire gauge for B+ and B– cables capable of
handling maximum alternator output with minimum
voltage drop.

5. N1224-1 thru -6: Regulator was shipped as factory­installed on original alternator. If alternator was
replaced, re-install regulator on alternator and
torque mounting screws to 8.5 Nm/75 lb. in.

N1224: Install regulator as specified by customer.

AC terminal stacking order:

—6 mm nut

—disc spring washer

—customer specifi ed terminal

Torque to 3.4 Nm/30 lb. in.

E terminal stacking order:
—5 mm nut
—disc spring washer
—customer specifi ed terminal
Torque to 3.4 Nm/30 lb. in.

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B– terminal stacking order:
—10 mm x 1.5 bolt
—disc spring washer
—fl at washer
—customer ground terminal
Torque to 15 Nm/11 lb. ft.

Mounting bolt, metric grade 8.8 or higher,
torque to 88 Nm/65 lb. ft. (2 places)

10 mm x 1.5 x
20 mm deep,
mounting bolt
metric grade 8.8
or higher, torque to
34 Nm/25 lb. ft.

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J1939 Data

Connector

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Slip bushing must be tightened
against bracket —
see “CAUTION” above

Alternator-to­regulator harness

Figure 1 - Alternator Installation Details

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

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