Chevrolet Equinox Service Manual: #03-00-91-001F: Vibration Analysis Worksheet - (Feb 19, 2013)

To:

Dealer:

Fax Number:

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VIN__ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __

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Procedure Performed By:

Date:

Model:

Year: Gear Ratio:

Odometer:

VIN __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __

TAC Case #, if applicable:

Conditions During Road Test Procedures

As condition occurs: Engine RPM_____________

Vehicle Speed__________________

Vibration/Noise detected during the following road test procedures:

Engine RPM_______________ Vehicle Speed_______________

Slow Acceleration Test: Yes__________ No__________

Neutral Coast-Down Test: Yes__________ No__________

Downshift Test: Yes__________ No__________

Neutral Run-Up Test: Yes__________ No__________

Brake Torque Test: Yes__________ No__________

Steering Input Test: Yes__________ No__________

Standing Start Acceleration (Launch Shudder) Test: Yes__________ No__________

Vibration/Noise Eliminated with TCC Commanded On: Yes__________ No__________

Vibration/Noise Eliminated with TCC Commanded Off: Yes__________ No__________

Vibration/Noise Duplicated on Hoist: Yes__________ No__________

When using the EVA, always take a snapshot. This will help determine which vibrationshows up the most.

Important:Vibrate software can also be used to assist in vibration diagnosis. Refer to VibrateSoftware Description and Operation in SI.

EVA Readings

Refer to Electronic Vibration Analyzer (EVA) Description and Operation in SI for moredetailed information.

Important:As a reminder, place the EVA sensor where the vibration is felt by the customer oron the test drive ie: if the vibration complaint is from the seat then place the sensoron the seat track, if the vibration complaint is from the steering wheel then attachthe sensor to the steering column. Ensure the word “UP” on the sensor is physicallyfacing up. The typical areas are the seat track, the steering columnor the instrument panel. Locating the EVA sensor on additional area (i.e. the rightfender, left fender, right quarter panel, left quarter panel, rear seat track, etc.)may also assist in determining the component causing the vibration/noise. The keyis to look for the same Hz reading with the greatest amplitude G readings.

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FILL OUT ONLY THE APPLICABLE PORTION OF THE WORKSHEET THAT APPLIES TO THE VIBRATION/NOISE:

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Sensor at Steering Column:

1st Line MPH/KPH:__________ HZ:__________ Gs:__________

2nd Line MPH/KPH:__________ HZ:__________ Gs:__________

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Sensor at Drivers Seat Rail:

1st Line MPH/KPH:__________ HZ:__________ Gs:__________

2nd Line MPH/KPH:__________ HZ:__________ Gs:__________

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Sensor at Passenger Seat Rail:

1st Line MPH/KPH:__________ HZ:__________ Gs:__________

2nd Line MPH/KPH:__________ HZ:__________ Gs:__________

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Driveshaft Runout:

Is runout within specification- Yes__________ No__________

Initial: Frt:__________ Center:__________ Rear:__________ Stub Shaft:__________

Current: Frt:__________ Center:__________ Rear:__________ Stub Shaft:__________

Pinion Flange Runout Reading:__________

Has a system balance been attempted: Yes__________ No__________ (If no, perform aSystem Balance)

Were the drums removed to system balance- Yes__________ No__________

Initial: HZ__________ Gs__________

Current: HZ__________ Gs__________

Hose clamps added: Yes__________ No__________

Prop shaft indexed- Yes__________ No__________

If a System Balance has been attempted but the vibration is still present or systembalance was not able to be achieved, check the ring gear backlash in eight differentspots on the ring gear. Note that excessive ring gear runout may result in a firstorder tire speed or first order prop shaft speed concern.

Backlash in eight equal spots on the ring gear (readings should not vary more than0.002-in (0.050-mm)):

1__________ 2__________ 3__________ 4__________ 5__________ 6__________ 7__________8__________

Does the vehicle have any of the following components attached-

Pinion damper: Yes__________ No__________

Pinion flange damper: Yes__________ No__________

Exhaust damper: Yes__________ No__________

Initial: Front angle:__________ Center Angle:__________ Rear Angle:__________

Current: Front angle:__________ Center Angle:__________ Rear Angle:__________

Were shims added to the following-

Transmission/transfer case mount: Yes__________ No__________

Pinion nose (rear springs): Yes__________ No__________

Center Support Mount: Yes__________ No__________

Tire Size and Brand:_____________________________________

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Record wheel balance information below if available record weight information priorto balance and after balance.

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Wheel/Tire balance

Right rear: Inner Weight:__________ Outer Weight:__________

Left rear: Inner Weight:__________ Outer Weight:__________

Right front: Inner Weight:__________ Outer Weight:__________

Left front: Inner Weight:__________ Outer Weight:__________

Wheel/Tire Runouts on vehicle (max. 0.050 in (1.27 mm))

Refer to the latest version of Corporate Bulletin Number 00-03-10-006 for tire radialforce variation information.

Right rear: Inner lateral:__________ Center radial:__________

Left rear: Inner lateral:__________ Center radial:__________

Right front: Inner lateral:__________ Center radial:__________

Left front: Inner lateral:__________ Center radial:__________

Mounting surface runouts (max. 0.005 in (0.127 mm))

Flange, right rear:__________ Hub, right front:__________

Flange, left rear:__________ Hub, left front:__________

Wheel stud runouts (max. 0.008 in (0.203 mm))

Flange, right rear:__________ Hub, right front:__________

Flange, left rear:__________ Hub, left front:__________

GM bulletins are intended for use by professional technicians,NOT a "do-it-yourselfer".  They are written to inform thesetechnicians of conditions that may occur on some vehicles, or toprovide information that could assist in the proper service of avehicle.  Properly trained technicians have the equipment,tools, safety instructions, and know-how to do a job properly andsafely.  If a condition is described, DO NOT assume that thebulletin applies to your vehicle, or that your vehicle will havethat condition.  See your GM dealer for information on whetheryour vehicle may benefit from the information.

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