THE ALTERNATOR PULLEY MAY BE ASSEMBLED INCORRECTLY Caterpillar

THE ALTERNATOR PULLEY MAY BE ASSEMBLED INCORRECTLY

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THE ALTERNATOR PULLEY MAY BE ASSEMBLED INCORRECTLY

CONFIDENTIAL TIBU2685-00

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TECHNICAL INFORMATION BULLETIN	NOVEMBER 5, 2003
MOTOR GRADERS	12H (AMZ00246 ? AMZ00417); 135H (AMX0191) 140H (APM00643 ? APM01069, APM01071 ? APM01084, APM01086, APM01088); 143H (APN00283 ? APN00343); APN00345 ? APN00347), 14H (ASE00674 ? ASE00917, ASE00919, ASE00924), 160H (ASD00260 ? ASD00333), 163H (ARL00277 ? ARL00294), 16H (ATS00207 ? ATS00240)
COMPONENT CODE	1405

SUBJECT: THE ALTERNATOR PULLEY MAY BE ASSEMBLED INCORRECTLY

PROBLEM:

The alternator pulley may be installed incorrectly on certain 12H, 135H, 140H, 143H, 160H, 163H, 14H, and 16H Motor Graders. The pulley could be assembled backwards on the affected machines. An incorrectly installed pulley results in the misalignment of the pulley. Several problems could be indicators of an incorrect alternator pulley installation. These symptoms include:

Premature belt wear
Belt noise
A ticking noise, which can come from the alternator. This can occur when the pulley causes the alternator fan to deflect and hit the alternator.

SOLUTION:

Inspect the puller to ensure proper installation.

Illustration 1. A pulley that is installed incorrectly.
(A) The bolt does not come through the flange nut (threads are visible on the inside of the nut).
(B) Extrusion on pulley is visible when it should press against the alternator fan.

Illustration 2. A properly installed alternator pulley.
(1) The bolt extends through the flange nut
(2) The pulley extrusion face is against the alternator fan (and not visible)
(3) There is a counter bore in the pulley where the flange nut rests

If the alternator pulley is not installed correctly (Illustration 1), remove it and reinstall correctly. See Illustration 2.

Refer to the Disassembly and Assembly Manual for the machine. See "Alternator Remove and Install" to reference how to access the alternator and remove and install the belt. See Table 1 for the torque specification of the nut.

Note: The alternator does not need to be removed.

Table 1.

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Sales Model	Pulley Part Number	Amperage	Torque
12H, 135H	129-5096	55	102 ? 7 N?m (75 ? 5 lb ft)
12H, 135H	129-5096	75	102 ? 7 N?m (75 ? 5 lb ft)
140H, 143H, 160H, 163H, 14H, 16H	123-0790	75	102 ? 7 N?m (75 ? 5 lb ft)
140H, 143H, 160H, 163H, 14H, 16H	123-0790	95	127 ? 10 N?m (93 ? 7 lb ft)

COPYRIGHT 2003 CATERPILLAR
ALL RIGHTS RESERVED

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