SB 3125

Service Bulletin No. 3125
MODEL:
TYPE:
J Series
SECTION/GROUP:
Service Information
12-SUSPENSION
DATE:
10/07/2019
SUBJECT:
ZF Front Sway Bar Lubrication
CONDITIONS:
Service Information Only
Description:
Motor Coach Industries (“MCI”) is instructing customers hearing noise near the front sway
bar during driving to follow this procedure to apply anti-seize lubricant as per the instruction.
This procedure is applicable to MY18 to MY20 coaches within the VIN range: 68314-69657,
21000-21018
Read this entire procedure before beginning work.
Use Safe Shop Practices At All Times.
To avoid personal injury:
a. Proper Personal Protective Equipment (PPE) must be worn. Safety glasses and
protective gloves are required for working with DEF Fluid.
b. Turn the main battery disconnect switch to the OFF position.
c. Ensure that both the front and the rear wheels are chocked.
d. Position the ENGINE RUN and ENGINE START switches on the engine
compartment remote control box to the OFF position.
e. Allow enough time for components to cool down prior to working in the engine
compartment
Motor Coach Industries Ltd.
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Service Bulletin No. 3125
1.0
Material requirements
No material required.
2.0
Special Tools
Anti-seize lubricant, MCI P/N: 23-01-0055 (Vendor: Permatex, VPN: 80078).
3.0
Lubricant application
Drain the air from the front suspension by releasing all the air in the front tank equipped
with an automatic drain valve.
Lift the coach to desired work height. Position safety stands underneath the coach in only
the specified locations shown in Section 3F in the MCI J4500 Maintenance Manual.
Motor Coach Industries Ltd.
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Service Bulletin No. 3125
Identify the sway bar under the front suspension system.
Sway bar
Remove and save the 4 bolts and nuts securing the sway bar clamps on the driver side.
Remove and save
the hardware
Take the bushing out and apply anti-seize lubricant, MCI P/N: 23-01-0055, all over the
inside surface of it.
Apply lubricant all over
the inside surface
Motor Coach Industries Ltd.
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Service Bulletin No. 3125
Install the bushing on the sway bar.
Apply anti-seize lubricant, MCI P/N: 23-01-0055, on the outside surface of the bushing
where it comes in contact with the clamp.
Apply lubricant
on the bushing
Reinstall the clamps using existing hardware and torque them to 206-226Ft-Lbs.
Torque the bolts to
206-226 Ft-Lbs
Repeat the process for the bushing on the curb side.
End of the procedure
Motor Coach Industries Ltd.
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