Countries: Document ID: 1K1201497

iKN Availability: ISIS, NotSIR Revision: 0
Major System: ENGINE Created: 5/23/2024
i ow Current Language: English Last Modified: 7/3/2024
Knowledge Base Other Languages: NONE Author: Jeff Polich
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Title: HX Belt Squealing or Fretting
Applies To: HX with X15

CHANGE LOG

Please refer to the change log text box below for recent changes to this article:

®
107/03/2024- Initial Article Release

DESCRIPTION

This document will guide the user through diagnosing and repairing X15 belt noise and fretting on the HX chassis only.

This document only applies to HX models with X15 engines.

SYMPTOM(s)

Customer Observations or Concerns:

* Complaint of belt noise (chirping or squealing)

+ Premature belt failure
° Belt fretting

SPECIAL TOOL(s) / SOFTWARE

Not Applicable

SERVICE PARTS INFORMATION

Not Applicable

DIAGNOSTIC STEP(s)

WARNING! To prevent property damage, personal injury, and / or death, park vehicle on a hard,
flat surface, turn the engine off, set the parking brake, and install wheel chocks to prevent the
vehicle from moving in either direction.

WARNING! To prevent property damage, personal injury, and / or death, if the vehicle must be
raised, do not work under the vehicle supported only by jacks. Jacks can slip or fall over.

WARNING! To prevent personal injury and / or death, always wear safe eye protection when
performing vehicle maintenance.

WARNING! To prevent property damage, personal injury, and / or death, keep flames or sparks

away from vehicle and do not smoke while servicing the vehicle’s batteries. Batteries expel
explosive gases.

WARNINGT To prevent property damage, personal injury, and / or death, remove the ground
cable from the negative terminal of the battery box before disconnecting any electrical
components. Always connect the ground cable last.

Step|

Action

Decision

DIAGNOSTIC: Verify the engine has an idler pulley assembly mounted to
the front cover. (See Figure 1)

Does the engine have an idler pulley assembly mounted to the front cover?

Yes. Proceed to step 2

No. This iKNow article does not apply.

on the idler pulley. The belt should have an equal distance along the
lentire distance of the square.

\See Figure 2 for an example of good alignment
\See Figure 3 for an example of bad alignment

ls the belt running true with the pulley?

#1 Proceed to Cummins diagnostics for
checking pulley alignment.
Step|Action Decision
#2 |IDIAGNOSTIC: Check for proper belt alignment: Place a 90-degree square |1. Yes. This iKNow article does not

apply. Proceed to Cummins diagnostics
for checking pulley alignment.

2. No. Go to the next section "Repair
Steps"

Figure 1: HX Idler Pulley Mounted to X15

Item 1: X15 Front Cover
Item 2: Idler Pulley Assembly

[Figure #2: Belt Running true to pulley

NOTE: The distance between the belt and the square is equal distance

Figure #3: Example of idler pully not running true to belt

NOTE: Notice the distance between the square and the belt. Looking at the square, the bottom is
much closer to the belt as compared to the top of the square.

REPAIR STEP(s)

REMOVAL PROCEDURE:

Figure #4: HX Idler Pulley and Bracket Assembly

Item 1: X15 Front Cover
Item 2: Idler bracket Standoff
Item 3: Mounting Bolts 3 ea.
Item 4: Idler Pully Bracket
Item 5: Idler Pulley

Step 1:

Loosen all idler pulley mounting bolts (see Figure 4 Item 3)

Step 2:

To ensure the belt runs true with the pulley, add a washer or washers between the Idler pulley bracket (Figure 4, Item 2) and the
engine front cover (Figure 4, Item 1).

Note: Typically, positioning a single washer behind one of the bracket standoffs is adequate to properly align the pulley (see
Figure 5, Items 1 & 2).

[Figure #5: Idler Bracket Assembly

Item 1: Bracket Stand Off 1
Item 2: Bracket Stand Off 2
Item 3: Bracket Stand Off 3

Step 3:
Verify pulley alignment.

Note: There should now be an equal distance between the square and the belt (See Figure 2)

INSTALLATION PROCEDURE:

Step 1:

Torque mounting bolts to 19 to 21 ft-lbs. (25.9 to 28.8 N-m)
Step 2:

Verify repair, start the engine verify there is no belt noise, and that the belt is not starting to fray.

WARRANTY INFORMATION

Warranty Claim Coding:

Refer to the Warranty Coding Manual for Group and Noun Codes.

Standard Repair Time(s):
Refer to the SRT Manual for Repair Times

OTHER RESOURCES

Master Service Information Site