NHTSA ID Number: 11018853
Manufacturer Communication Number: FDM-SVC-027
TSB/Document Date: 2025-06-02
Summary
This bulletin provides instruction for replacing a Micronet display with an updated Grayhill overhead display and T27 TCU.
Service Kit Bulletin
2.0 Grayhill Display and T27 Telematics
Control Unit (TCU) Update
Date: May 7, 2025
Bulletin Name: FDM-SVC-027
Model: Oshkosh
S-Series
Units Affected: 2.0 Front Discharge Mixers
VIN 800613 - 821848
Purpose:
This bulletin provides instruction for replacing a Micronet display with an updated Grayhill overhead display and
T27 TCU.
Notice:
• This bulletin should be read and understood 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
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.
Use appropriate Personal Protective
Equipment (PPE) as required by your
company.
Tools and Equipment Required
Customer to supply:
•
•
•
•
•
•
•
•
•
Hand tools
Drill and 3/16” drill bit
Tape measure
Torque wrench (inch pounds and foot pounds)
Sand paper
Laptop*
Orchestra software*
PCAN adapter cable*
FCM software*
*Front Control Module (FCM) update to be performed by S-Series service personnel
1
Parts Required
Item
Part Number
1
A000W843
Description
SCR, BTN, SOC #8-32 X 1.12 SS
Qty.
2
2
A000E542
LOCTITE, #242
3
A000F010
INSERT, HEX 0.25-20 X 0.165 ZY
A/R
4
4
A000F374
NUT, HEX, LKNY 6-32 SS
2
5
A001C246
NUT, ACRN #8-32 SS NS
2
6
A000V859
WASH, FLT, SAE #6 X 0.38 X 0.05 SS
2
7
A000W179
BRKT, DISPLAY, MTG
1
8
A000X442
WIRE HARN, JUMPER DISPLAY
1
9
A001K952
MODULE, DSPL 3D70, 9.2.50, ASSY
1
10
A001K385
MODULE ASSY, TCU, 12.0.0
1
11
A001F369
WIRE HARN, JUMPER, TELEMATICS
1
12
A001B842
PLATE, DISPLAY CONNECTOR
1
13
A001B897
SCR, PAN, XR #6-32 X 1.50 SS
2
14
A000C018
CABLE TIE 6.30 X 0.20
7
15
A000V858
WASH, FLT, SAE #8 X 0.44 X 0.05 SS
2
16
A001K954
SOFTWARE, FCM, S-SERIES, 9.2.51
1
2
Procedure
Recording Vehicle Information
1. Log in as Service Manager and record all active/set vehicle options. See Figure 1.
Figure 1
2. Record total drum revolutions. See Figure 2.
Slump
384.0
psi
Total Revolutions
Pusher
0
psi
Tag
0
psi
LSTA
0 psi
Target
0 psi
Figure 2
3
3. Record lifetime gallon value. See Figure 3.
Slump
384.0
psi
Pusher
0
psi
Tag
0
psi
LSTA
0 psi
Target
0 psi
Add Water Set/Monitor
Add Water:
Clear
+1
0.5
+2
+5
Gallon(s)
+ 10
.0/.5
Trip Gal
104.2
Lifetime Gal
190.7
Dismiss
Start
Lifetime Gallons
Figure 3
4. Record slump profiles. See Figure 4.
Figure 4
Lockout/Tagout
5. Place unit on a flat surface, engage parking brake, chock 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.
6. 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.
4
1
DA
NG
ER
Th
be is en
e
e
n
L O r gy
Un
CK sou
th auth
ED rce
OU ha
in is loc oriz
T! s
R im k/t ed
e
ma media ag m rem
rks te ay ova
:
dis re l o
ch sult f
ar g
e.
1
2
Figure A
Figure B
2
Display and TCU Installation
7. Remove four screws and washers securing radio panel to overhead console. See Figure 5. Save screws and
washers for reinstallation of radio panel.
8. Disconnect harness connector and antenna cable from back of radio. Set radio panel aside.
Screws and
Washers
Radio Panel
Figure 5
9. Remove four screws and washers securing overhead console access panel. See Figure 6. Save screws and
washers for reinstallation of access panel.
Access Panel
Figure 6
5
10.
Remove four screws and washers securing Micronet display panel to overhead console. See Figure 7.
Save screws and washers for reinstallation.
11.
Disconnect five cables connected to Micronet display and remove display and bracket from overhead
console.
12.
Remove four screws and washers securing Micronet display to mounting bracket. Save screws and
washers for installation of Grayhill display to new mounting bracket. The Micronet display and mounting bracket
will not be reused.
Micronet Display
Figure 7
13.
Remove seven screws and washers securing right-hand access panel to overhead console. See Figure 8.
Save screws, washers, and access panel for reinstallation.
Right-Hand
Access Panel
Figure 8
6
14.
Remove fifteen screws and washers securing side console cover. See Figure 9. Save screws, washers,
and side console cover for reinstallation.
15.
Disconnect connector C18 from joystick and remove side console cover. Set cover aside for reinstallation
later.
Console Cover
Figure 9
16.
Remove two screws and washers securing clipboard holder. See Figure 10. Save screws and washers for
reinstallation of clipboard holder side console cover.
17.
Remove clipboard holder from side console and set aside for reinstallation later.
Clipboard Holder
Figure 10
7
18.
Open cab electrical cabinet door.
19.
Install jumper harness (A000X442) starting in upper raceway. See Figure 11. Route front control module
connectors C155A and C155B end of harness into electrical cabinet and down to front control module (FCM).
20.
Route display connectors C1529, C1530, and C1538 end of harness into overhead console. See
Figure 11.
Grayhill Display
Connectors
Jumper Harness
(A000X442)
Front Control Module
Connectors
Figure 11
NOTE
The electrical cabinet power port connector
may need to be disconnected while installing
jumper harness.
21.
Disconnect cab harness connectors C155A and C155B from FCM. See Figure 12.
Connector
C155A
Connector
C155B
Power Port
Connector
Figure 12
22.
Connect cab harness connector C155A removed in Step 21 to jumper harness connector C155A_F_
JUMP. See Figure 13.
8
23.
Connect cab harness connector C155B removed in Step 21 to jumper harness connector C155B_F_
JUMP. See Figure 13.
24.
Connect jumper harness connector C155A_M_JUMP to FCM A. See Figure 13.
25.
Connect jumper harness connector C155A_M_JUMP to FCM B. See Figure 13.
Connector
C155A_M_JUMP
Connector
C155A_F_JUMP
Connector
C155B_M_JUMP
Connector
C155B_F_JUMP
Figure 13
26.
Route jumper harness ground through bottom of electrical cabinet into side console. See Figure 14
Vehicles Prior to SN 809269.
a. Loosen and remove existing console hex bolt. See Figure 14.
b. Remove paint from around where hex bolt was removed.
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TSB/Document ID: FDM-SVC-027
Replacement Service Bulletin Number:
MFR Communication Date: 2025-06-02
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: UNKNOWN OR OTHER
MFR Component System:
MFR Component Subsystem:
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