Technical Service Information Bulletin

Date: November 19, 2020Bulletin Name: FDM-TSIB-017 Model: Oshkosh S-SeriesUnits Affected: MY 2020 and newer Front Discharge Mixers

Software Update - v8.2.1/7.6.1

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Purpose:This bulletin provides general information about the v8.2.1/7.6.1 software update that enhances the vehicle’s hydraulic system, auxiliary axles (tag, pusher, and Load-Span®), parking brake system, and drum speed.

Notice:• This bulletin should be read and understood in its entirety before operating the vehicle.

Software Update General Information:Hydraulic SystemSoftware v8.2.1/7.6.1 includes the following updates to the vehicle’s hydraulic system.

• Increased maximum radiator fan speed for improved cooling performance.• Modified the hydraulic system caution and warning temperature set points based on increased cooling

capacity.• Fixed/eliminated the cooling fan speed valve open circuit fault.• Limited cooling fan speed while operating the hydraulic chutes to improve chute performance.

Auxiliary AxlesSoftware v8.2.1/7.6.1 includes the following updates to the vehicle’s auxiliary axles.

• Removed the speed interlock for raising and lowering pusher or tag axles.• Added a splash screen to the overhead display to notify the operator the vehicle is traveling greater than 15

MPH with the Load-Span® tag axle (LSTA) in the UP position, see Figure 1.

Slump384.0psi

LSTA0 psi

Target0 psi

Tag0

psi

Pusher0

psi

LSTA Raised!Lower LSTA Axle to down position.

Dismiss

Figure 1 - LSTA Raised Splash Screen

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• Added flashing down empty and down loaded lights on the instrument panel which will display when the vehicle is traveling greater than 15 MPH with the LSTA in the UP position, see Figure 2.

Figure 2 - Instrument Panel

Down Empty Icon

Down Loaded Icon

• Added intermittent audible alarm when the vehicle is traveling greater than 25 MPH with the LSTA in the UP position.

• Removed the LSTA speed interlock for raising the auxiliary axle at speeds greater than 15 MPH.• Removed the LSTA speed interlock for lowering the axle to Down Empty at speeds greater than 15 MPH.

Parking BrakeSoftware v8.2.1/7.6.1 includes the following updates to the vehicle’s parking brake system.

• Added Park Brake Mode indicator to the overhead display to show the LSTA is de-pressurized when the parking brake is engaged, see Figure 3.

Slump384.0psi

LSTA483 psi

Tag0

psi

Pusher0

psi Park Brake Mode

LSTA depressurized

Truck must be on level ground before

entering Scale Mode

Figure 3 - Park Brake Mode

Pressure Gauge Park Brake Mode Indicator

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• Added Scale Mode indicator to show the vehicle is pressurizing the LSTA axle with the parking brake engaged, see Figure 4.

Slump384.0psi

LSTA483 psi

Tag0

psi

Pusher0

psiScale Mode

LSTA pressurized

Truck must be on level ground

Pressure GaugeFigure 4 - Scale Mode

Scale Mode Indicator

• Updated the operator manual to include operation of the Park Brake Mode and Scale Mode, see Figure 5.13.3.3 Park Brake Mode

Park brake mode is automatically entered when the truck is parked and the vehicle’s parking brake is applied. The system automatically relieves all pressure to the Load-Span® Tag Axle to achieve the vehicle’s maximum parking brake capability.

Slump384.0psi

LSTA483 psi

Tag0

psi

Pusher0

psi Park Brake Mode

LSTA depressurized

Truck must be on level ground before

entering Scale Mode

Park Brake Mode

13.3.4 Scale Mode

Scale mode is used to weigh/scale the truck and adjust the LSTA pressure setting when the truck is parked. The system increases the Load Span® Tag Axle pressure to the system’s set value and allows the value to be adjusted.Enter scale mode from park brake mode by pressing either the Down Empty or Down Loaded pushbutton on the driveline switch panel for 3 seconds.

Slump384.0psi

LSTA483 psi

Tag0

psi

Pusher0

psiScale Mode

LSTA pressurized

Truck must be on level ground

Scale Mode

Figure 5 - Operator Manual Updates

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• The calibration check period of the LSTA hydraulic system was lengthened and requires acceptance from the operator before initializing, see Figure 6.

Slump384.0psi

Tag0

psi

Pusher0

psi Park Brake Mode

LSTA depressurized

Truck must be on level ground before

entering Scale Mode

LSTA0 psi

Target0 psi

LSTA calibration check required -Once started, you can drive away or lift the axle if needed,the check will terminate. The next time the truck is in a statewhere the interlocks are met, check will be requested again.

-To initiate the check, the truck must be in Park with the Engine running, and the LSTA is in Down Empty or DownLoaded, and check confirmed.

Confirm Dismiss

Figure 6 - LSTA Calibration

Verbage for the inital LSTA calibration, or calibration after servicing the LSTA was updated, see Figure 7.

LSTA Hydraulic CalibrationConfirm that the following conditions are met:

-Vehicle is on solid, level, and flat ground-If installed, air conditioning is turned off.

-For trucks with air ride suspension, truck has reached ride height.-Wheels must be chocked.

-Enabling calibration shall allow LSTA to lower and pressurize in the down mode.

When ready, press the Calibrate button.

Calibrate

Figure 7 - LSTA Calibration

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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.

(888) 686-7278www.streetsmartparts.com

• Updated the operator manual to include paragraph stating the auxiliary axles must be raised prior to engaging the parking brake.

Figure 8 - Operator Manual Park Brake Auxiliary Axles Update

Drum Speed Increments• Additional drum slow speed increments were added. • Updated increments: 0.25, 0.5, 0.75, 1.0, 1.25, 1.5, 2.0. • Previous increments were 0.5, 1.0, 1.5, 2.0.

Slump384.0psi

LSTA0 psi

Target0 psi

Tag0

psi

Pusher0

psi

Figure 9 - Drum Speed

Drum Speed Status Bar

First Box Slow Blink = 0.25First Box Intermittent Blink = 0.50First Box Fast Blink = 0.75