FDM-TSIB-046

Technical Service Information Bulletin
Date: November 7, 2023
Bulletin Name: FDM-TSIB-046
Model: Oshkosh S-Series 2.0
Units Affected: Serial No. 788727 - 827763
2.0 Front Shock Absorber and Upper
Mount Update
Purpose:
This bulletin provides instructions for installing new updated front shock absorbers and upper mounting brackets.
The updated shock absorber and mounting bracket lowers the top of the shock absorber improving the allowable
maximum travel of the front leaf spring pack and keeps the shock absorber in its normal travel zone reducing the
time the shock absorber is in hydraulic rebound.
Notice:
• Read and understood bulletin in its entirety before performing this procedure.
• All procedures outlined in the bulletin must be performed by skilled service personnel. Refer to the product
service manual for descriptions of maintenance procedures.
SAFETY NOTICE
Perform your company’s Lockout/Tagout
procedure. If your company does not have a
Lockout/Tagout procedure, follow OSHA
1910.147 and 1910.146 Confined Space as
appropriate.
SAFETY NOTICE
Use appropriate Personal Protective
Equipment (PPE) as required by your
company.
Tools and Equipment Required:
Customer to supply:
• Hand tools
• Torque wrench (foot pound)
Parts Required
Item
Part Number
Description
1
A001E766
MOUNT, FR, SHOCK, UPPER
2
2
A001F220
ABSORBER, SHOCK, FR
2
3
A000A565*
SCR, FLG, HEX 0.62-11 X 1.75 G8 MB
4
4
A000A822*
SCR, CAP, HEX 0.75-10 X 5.00 G8 MB
2
5
A000A825*
SCR, CAP, HEX 0.75-10 X 6.50 G8 MB
2
6
A000A952*
WASH, FLT, 0.75 X 1.47 X 0.13 MB, HDN
4
7
A000D988
NUT, FLG, LKSP 0.62-11 G8 MB
4
8
A000A694
NUT, FLG, LKDT 0.75-10 G8 MB
4
9
A000F590*
WASH, FLT 0.75 X 1.38 X 0.50 MB
4
* Hardware listed for reference. Replace hardware if worn or damaged.
1
Qty.
Procedure:
Lockout/Tagout
1. Park vehicle on a flat level surface, block truck tires, and perform your company’s Lockout/Tagout procedure.
If your company does not have a Lockout/Tagout procedure, follow OSHA 1910.147 and 1910.146 Confined
Space as appropriate.
2. The vehicle’s BATTERY DISCONNECT switch is located on the left-hand side of the battery box. Use the
battery disconnect switch when performing any maintenance so the vehicle cannot accidentally be started.
a. Turn the battery disconnect switch (Figure A, Item 1) counterclockwise so the hole on the switch aligns
with the hole in the bracket (Figure A, Item 2).
b. Install the safety lockout device ring (Figure B, Item 1) through the holes on the battery disconnect switch
and the bracket.
c. Install a padlock (Figure B, Item 2) onto the safety lockout device ring, lock it, and put the key in your
pocket. If more than one person is working on the vehicle, each person must install his or her own padlock.
1
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Un
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1
2
2
Figure A
Figure B
Shock Absorber and Upper Mount Installation
3. Loosen and remove lower mounting hardware from vehicle’s left side front shock absorber. See Figure 1.
The lock nut will not be reused.
4. Loosen and remove upper mounting hardware from vehicle’s left side front shock absorber. See Figure 1.
The lock nut will not be reused.
Shock Upper
Mounting Hardware
Shock Lower
Mounting Hardware
Figure 1 - Shock Absorber Removal
2
5. Remove shock absorber from vehicle. Shock absorber will not be reused.
6. Loosen and remove mounting hardware securing upper mounting bracket to frame rail. See Figure 2. The
lock nuts will not be reused.
7. Remove upper mounting bracket from frame rail. Mounting bracket will not be reused.
Upper Mounting
Bracket
Mounting
Hardware
Figure 2 - Upper Mounting Bracket Removal
8. Inspect all mounting hardware. Replace any damaged or worn mounting hardware. Lock nuts must be
replaced with new lock nuts.
NOTE
The shock absorber upper mounting bracket
does not need to be replaced when installing
updated front shock absorber, but it is highly
recommended. The new upper mounting
bracket is longer, adjusting the allowable
maximum travel of the shock absorber.
9. Install new upper mounting bracket (A001E766) to frame rail using 0.62-11 X 1.75” flange screws
(A000A565) and new lock nuts (A000D988). See Figure 3. Final tighten mounting hardware to 210 ft. lbs.
New Lock Nuts
(A000D988)
Upper Mounting
Bracket
(A001E766)
6.930
inches
6.50
inches
Original
(A000A331)
Flange Screws
(A000A565)
Figure 3 - Upper Mounting Bracket Installation
3
Updated
(A001E766)
10.
Install shock absorber (A001F220) lower eyelet to front axle using 0.75-10 X 6.50” cap screw
(A000A825), flat washer (A000A952), and new lock nut (A000A694). Cap screw must be installed from inboard
side. See Figure 4. Final tighten mounting hardware to 303 ft. lbs.
11.
Install shock absorber (A001F220) upper eyelet into upper mounting bracket using 0.75-10 X 5.00” cap
screw (A000A822), flat washer (A000A952), two spacer washers (A000F590), and new lock nut (A000A694).
See Figure 4. Final tighten mounting hardware to 303 ft. lbs.
Flat Washer
New Lock Nut
Flat Washer
(A000F590)
(A000A694)
(A000A952)
Cap Screw
(A000A822)
New Lock Nut
(A000A694)
Cap Screw
(A000A825)
Flat Washer
(A000A952)
Figure 4 - Shock Absorber Installation
12.
Repeat Step 3 - 11 for the vehicle’s right side front shock absorber and mounting bracket.
13.
Remove lockout/tag and wheel chocks.
Continuous Improvement:
The change included in this document is part of the
McNeilus Continuous Improvement Process.
McNeilus’s quality policy is providing customer satisfaction
through innovative products, dedicated service, and a
constant focus on continuous improvement.
4
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