88-12

Hood Pivot Replacement, 4900 Models
Constellation
Heritage
4700 Models

4800 Models
> 4900 Models

Western Star
Service Bulletin

5900 Models
6900 Models

General Information
When replacing a hood pivot on a Western Star 4900 vehicle, discard the old fasteners and replace them with
the new fasteners listed in Table 1 and Table 2, using the procedure in this bulletin.

Procedure
1. Park the vehicle on a level surface, shut down the engine, and set the parking brake. Chock the tires.
2. Place a support between the floor and the front of the hood; see Fig. 1.
The support should be as wide and as long as the front of the hood, and should be the same height as the
lowest edge of the hood. Place cardboard, carpet, rags or other padding on top of the support to protect the
hood.
3. Tip the hood back about half-way, until it is balanced over the pivot, to remove the tension on the torsion
springs. Prop the hood in this position or have another person support it there.
4. Remove the bolts that attach the springs and the safety cable to the radiator mounted bracket. See Fig. 2.

2
1
3

1
01/28/2003

A

f880634

NOTE: LH shown.
1. Spring Bolt
2. Cable Bolt

3. Radiator Bracket

Fig. 2, Torsion Spring and Safety Cable

03/17/2011

f880889

A. The top of the support should be at same height
as the lowest edge of the hood.
1. Cardboard, Carpet, or Furniture Pad
Fig. 1, Supporting the Hood

5. Rest the hood fully open on the support.
6. Cut the tie straps that retain the headlight harness, and unplug the headlight connectors.

Western Star Service Bulletin, April 2015

Page 1

88-12

Hood Pivot Replacement, 4900 Models

Western Star
Service Bulletin

Constellation
Heritage
4700 Models

4800 Models
> 4900 Models

5900 Models
6900 Models

7. Remove the hood pivot nut, bolt, and washer. See Fig. 3.
8. Carefully roll or slide the hood support and hood away from the vehicle.
9. Remove the hood pivot from the pivot mount. Discard the capscrew and washer. See Fig. 4.

3
2

1
5
6

4

1
2

3

4

03/06/2015

f880922
03/05/2015

NOTE: LH shown.
1. Hood
2. Pivot Bolt, 3/4–10 x
2.5
3. Washer

4. Hood Pivot
5. Pivot Nut, 3/4–10
6. Hood Pivot Mount

f880921

NOTE: LH shown.
1. Capscrew, 3/4–16
2. Lockwasher

3. Hood Pivot
4. Hood Pivot Mount

Fig. 4, Hood Pivot Mounting
Fig. 3, Hood Pivot

10. Using a new capscrew and lockwasher (see Table 1), install the hood pivot on the mount. Tighten the capscrew 170 to 180 lbf·ft (230 to 244 N·m). See Fig. 4.
11. Supporting the hood, align the pivot bracket on the hood with the pivot.
12. Using new fasteners (see Table 2), insert the pivot bolt and washer, and secure with the nut. See Fig. 3.
Tighten the nut 260 lbf·ft (350 N·m).
13. Plug in the headlight harness connectors and use tie straps to fasten them securely to the hood.
14. Close the hood half-way and support it. Bolt the torsion springs and safety cables to the radiator bracket.
Tighten the torsion spring and safety cables 16 lbf·ft (21 N·m).
15. Remove the hood support and close and latch the hood.
16. Check and adjust the hood alignment following the instructions in Western Star Workshop Manual, Section
88.00, Subject 120.

Page 2

Western Star Service Bulletin, April 2015

88-12

Hood Pivot Replacement, 4900 Models
Constellation
Heritage
4700 Models

4800 Models
> 4900 Models

Western Star
Service Bulletin

5900 Models
6900 Models

Replacement Parts
Parts are available through the PDCs.
See Table 1 and Fig. 4 for hood pivot replacement parts.
See Table 2 and Fig. 3 for the pivot mounting replacement parts.

Part Number
23-09447-125
WWS 131046

Parts for Pivot Mounting, 4900 Models
Description
SCREW-CAP, HEX, GRADE 8, 3/4-16 UNF
WASHER-HELSPG LOCK ZN 0.75

Qty.
2
2

Table 1, Parts for Pivot Mounting, 4900 Models

Part Number
23-14085-250
23-09114-014
23-13577-111

Parts for Hood Pivot Replacement, 4900 Models
Description
SCREW-CAP, HEXSOCH, 3/4-10 x 2.5
WASHER-HRDN, 0.81 x 1.13 x 0.177, ZN
NUT-PTRQ 3/4-10NC GRC

Qty.
2
2
2

Table 2, Parts for Hood Pivot Replacement, 4900 Models

Warranty
This bulletin is informational only. Warranty does not apply.

Western Star Service Bulletin, April 2015

Page 3