NHTSA ID Number: 11029123
Manufacturer Communication Number: TSB 621
TSB/Document Date: 2026-03-02
Summary
The center ceiling above the overhead bunk on Grand Star Super C coaches may become unsecured over time.
Newmar
Corporation
PO Box 30
Nappanee, IN 46550
TSB 621
Aug. 25, 2025
TECHNICAL SERVICE BULLETIN
AFFECTED MODELS
2026:: Grand Star
DESCRIPTION
The center ceiling above the overhead bunk on Grand Star Super C coaches may become
unsecured over time.
ISSUE
The ceiling needs to be secured for optimal fit and finish.
UNITS AFFECTED
Please refer to the attached population list for affected units and VINs.
CORRECTIVE ACTION
Follow the attached instructions to remove the upper bunk ceiling to access the top of the wood
frame and add brackets. Add five (5) 4” long pieces of 1 x 1-1/2” alum angle (Newmar Part
#10956) to the top of the wood frame above the window. These pieces will be attached to the
cap using Sika Fast 3121 glue (Newmar Part #110841).
PARTS NEEDED
Item Description
Quantity Newmar Part #
Angle 1.5”x1”x4”
3 ea.
10956A
Sika Fast 3121
1 ea.
110841
Sika Fast Mixer Tip
3 ea.
110843
Screws
.009 ea.
25756
Sika Loaner gun
1 ea. If
needed
039256
Flat Rate Code: TSB 621
NOTE
Labor Time: 1 hr.
If your dealership does not have the gun for the Sika fast. Contact Newmar parts dept and one
can be shipped to you. The Dealership will be charged for the gun and credited when the gun
is returned.
IMPORTANT: Please read this bulletin in its entirety prior to beginning any diagnosis or repairs.
NOTICE: Any technical information published in this bulletin is intended for use only by a qualified, Newmar-authorized service technician. Newmar is not responsible for the misuse of this information.
Securing Overhead Bunk Ceiling
Remove the overhead bunk mattress, as well as any other items from the bunk area.
Cover the bunk floor with plastic or a drop cloth. This will make clean-up faster and easier, as well as
ensure the Sika Fast adhesive does not damage the finished bunk area.
Pull the overhead lights and vents out, and disconnect them from the top ceiling panel above the bunk
area. Set them aside for reinstallation later.
Move insulation out of the way for the brackets (as needed).
Prep brackets by drilling 7/32” holes on one side of the 1-inch side of the 1-1/2x 1 angle for the screws
attaching the bracket to the wood structure. Make sure the brackets are clean and oil-free. Review the
pictures for correct bracket placement.
Mark the locations where brackets will be fastened to the fiberglass, ensuring the old adhesive does not
prevent the bracket from contacting the cap/wood. Remove and/or clean where needed (if at all).
Load the glue in the gun, and install a mixer tip. Do not squeeze out epoxy until ready to use.
When ready, squeeze a decent-sized puddle on a throw-away piece of cardboard to ensure the mix has
made it through the tip and is mixed well. You will only have a few minutes before the mixture hardens in
the mixer tube (3 to 5 minutes), so you need to be ready to use the epoxy. If it hardens, you will need to
put on a new mixer tip, and then repeat the process.
If the wood came loose already from the adhesive holding it to the cap (do not remove the center ceiling
portion that goes around the window), put a bead of Sika Fast on the wood along the top (no need to
remove old epoxy), and lift the wood structure back up into place. Prop up the entire center ceiling
section, bracing it at the top near each bracket without creating vinyl damage from the prop(s).
If necessary, the manual privacy bunk shade and valance(s) may be removed for additional clearance. If
the wood structure is still adhered with Sika Fast, skip to the next step.
Apply an adequate amount of Sika Fast to the fiberglass cap where the brackets are to be installed,
allowing it to push out around the sides of the bracket. Set the brackets in place and install screws into
the wood. If props were used, remove them after the Sika Fast has hardened.
Note: Sika Fast is fully cured in one hour. Take a picture of the brackets installed to submit with the claim.
Reinstall the insulation, top cover, lights, vents, and screw covers that were previously removed, and test
the operation of each.
Clean up, install the bunk mattress, and any other items that were removed at the start of the process.
Production #
950289
950206
950207
950205
950266
950273
950220
950236
950215
950216
950217
950242
950243
950237
950244
950260
950261
950272
950270
950271
950232
950233
950234
950253
950263
950265
950278
950279
950226
950227
950262
950290
950224
950225
950254
950222
950258
950259
950223
950256
950257
950255
950286
950208
950212
950209
950280
950281
950282
950283
950275
950276
950291
VIN Number
4UZAE9FC5SCWH5816
4UZAE9FCXSCWD4758
4UZAE9FC0SCWH5853
4UZAE9FCXSCWG4648
4UZAE9FC7SCWH5851
4UZAE9FC2TCWK6613
4UZAE9FC0SCWE4876
4UZAE9FC8SCWG2221
4UZAE9FC4SCWH5855
4UZAE9FC7SCWH0410
4UZAE9FC1SCWG4649
4UZAE9FCXSCWG2222
4UZAE9FC1TCWK1578
4UZAE9FC6SCWE8687
4UZAE9FC2SCWG4644
4UZAE9FC3TCWH9574
4UZAE9FC9SCWH0408
4UZAE9FCXTCWK1577
4UZAE9FC0TCWK6612
4UZAE9FC6TCWL1927
4UZAE9FC8SCWG4647
4UZAE9FC6TCWM5097
4UZAE9FCXSCWG4651
4UZAE9FC9TCWK6611
4UZAE9FC0TCWK6609
4UZAE9FC1SCWE8693
4UZAE9FC8TCWM5098
4UZAE9FC0TCWL1941
4UZAE9FC1SCWH5814
4UZAE9FCXSCWH5813
4UZAE9FC8SCWE8688
4UZAE9FC8TCWL1928
4UZAE9FC4SCWE4878
4UZAE9FC1SCWG2223
4UZAE9FC6SCWG4646
4UZAE9FCXSCWE8692
4UZAE9FC6SCWH5856
4UZAE9FC8TCWL1931
4UZAE9FC4SCWG4645
4UZAE9FC6TCWK1575
4UZAE9FC7TCWK6610
4UZAE9FC9SCWH0411
4UZAE9FC6TCWL1930
4UZAE9FC8SCWG4650
4UZAE9FC5SCWE1827
4UZAE9FC9TCWH9577
4UZAE9FC7SCWH5820
4UZAE9FC1SCWH5831
4UZAE9FC5SCWH5833
4UZAE9FC9SCWH5821
4UZAE9FC4TCWM6894
4UZAE9FCXTCWM6897
4UZAE9FC6TCWM6895
Year
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
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2026
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2026
2026
2026
2026
2026
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2026
2026
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2026
2026
2026
2026
2026
2026
Brand
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
GS
Type Floor Plan Chassis Brand
CC
3444 FS
CC
3444 FS
CC
3948 FS
3444 FS
CC
CC
3444 FS
CC
3444 FS
CC
3444 FS
CC
3444 FS
3948 FS
CC
CC
3444 FS
CC
3444 FS
CC
3444 FS
CC
3444 FS
3444 FS
CC
CC
3444 FS
CC
3940 FS
3444 FS
CC
CC
3940 FS
CC
3444 FS
CC
3948 FS
CC
3444 FS
CC
3940 FS
CC
3948 FS
CC
3444 FS
CC
3948 FS
CC
3940 FS
CC
3940 FS
CC
3444 FS
CC
3444 FS
CC
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TSB/Document ID: TSB 621
Replacement Service Bulletin Number:
MFR Communication Date: 2026-03-02
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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