C.E. Niehoff & Co. C627, C628, C656, C657, C658 Installation

C627, C628, C656, C657,

and C658 Alternators

Installation Instructions

This symbol is used to indicate presence

CAUTION

of hazards that can cause minor property damage.

1. Install alternator as shown in Figure 1:

Slip bushing located in rear mounting foot must be securely tightened against alternator mount ing bracket on engine. Failure to do so can result in broken mounting feet or broken upper mounting bracket.

CAUTION

a. Use hardened washers between aluminum

surfaces and bolt heads and nuts. b. C656/C657/C658 OEM units are shipped with pulley, Belleville washer, and nut installed. C627/C628 OEM units are shipped with pulley, flat washer, and locknut installed. c. C656/C657/C658 aftermarket units are shipped with shaft collar, Bellville washer, and nut installed. C627/C628 aftermarket units are shipped with pulley, flat washer, and locknut installed. Remove and discard shaft collar. Install pulley and furnished washer. Torque furnished hardware to 163 Nm/120 lb. ft. d. Follow vehicle manufacturer’s recommenda tions for belt tension.

2. All cabling, wiring or conduit must be supported within 305 mm/12 in. of termination on alternator.

3. Choose wire gauge capable of handling maximum alternator output with no more than 0.2 V drop on each leg from alternator to battery.

4. Regulator is furnished on OEM units and is supplied separately by request with aftermarket units. Mounting screws on regulator should be torqued to 8.5 Nm/75 lb. in.

5. A2-155 regulator connections:

• Plug alternator-to-regulator harness into regulator.

• Connect IGN terminal to ignition source through existing switch. Torque M5 terminal nut on regulator to 4.5 Nm/40 lb. in.

• Connect P terminal to tachometer or relay. P terminal taps AC voltage, typically half the charge voltage. Torque M6 terminal nut on regulator to 4.5 Nm/40 lb. in.

6. A2-149 regulator connections:

• Plug alternator-to-regulator harness into regulator.

• Connect D+ terminal: D+ terminal provides 14 VDC voltage output to multiplex controller. When connecting D+ terminal to controller through a relay, the relay coil must be diode protected and rated for proper voltage. Torque M5 terminal nut on regulator to 4.5 Nm/ 40 lb. in.

• Connect R terminal to tachometer or relay. R terminal taps AC voltage, typically half the charge voltage. Torque M6 terminal nut on regulator to 4.5 Nm/40 lb. in.

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

Hardened washer

12mm/0.50 Locknut –

torque to

88 Nm/65 lb. ft.

Bracket

on engine

Battery output cable terminal

B– terminal bolt 10mm x 1.5 – torque to 15 Nm/11 lb. ft.

12mm x1.75 bolt –

torque to 32 Nm/24 lb. ft.

Lockwasher

Alternator B+

Terminal Stud

Insulator

Figure 1 - C656 Alternator Installation Details

C. E. Niehoff & Co. • 2021 Lee Street • Evanston, IL 60202 Tech Services Hotline 800-643-4633

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II0053C

Washer