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Driveline troubleshooting Print E-mail

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A number of problems can be associated with poor driveline performance, below we offer information on how to identify the problem and additional information on what may be causing the condition to help you in diagnose problem:

PROBLEM -- Vibration

  • Low gear shudder
  • At certain speeds under full drive or full coast
  • Under light loaded conditions

 

Causes

Solutions

Secondary couple load reaction at shaft support bearing
Improper phasing
Incompatible driveshaft
Driveshaft weight not compatible with engine-transmission mounting
Driveshaft too long for speed
Loose outside diameter fit on slip spline
Excessively loose u-joint for speed
Driveshaft out of balance; not straight
Unequal u-joint angles
U-joint angle too large for continuous running
Worn u-joint
Inadequate Torque on bearing plate cap screws
Torsional and/or inertial excitation
Reduce u-joint continuous running angle
Replace u-joint
Install two piece driveshaft with shaft support bearing
Use large diameter tube
Shim drivetrain components to equalize u-joint angles
Straighten and balance shaft
Check with transmission or axle manufacture - replace shaft bearing
Inspect u-joint flex effort for looseness - torque to specification
Check driveshaft for correct yoke phasi

 PROBLEM -- Premature Wear

  • Low mileage u-joint wear
  • Repeat u-joint wear
  • End galling of cross trunnion and bearing assembly
  • Needle rollers brinelled into bearing cup and cross trunnion
  • Broken cross and bearing assemblies

     

 

dlfld6_large.jpgBroken Cross

Causes

Solutions

End yoke cross hole misalignment
Excessive angularity
Improper lubrication
Excessive continuous running load
Continuous operation at high angle/high speed
Contamination and abrasion
Worn or damaged seals
Excessive torque load (shock loading) for u-joint and driveshaft size
Use special alignment bar to check for end yoke cross hole misalignment, replace end yoke if misaligned

Check u-joint operating angles with a spirit level protractor or Spicer Anglemaster®II, reduce excessive u-joint operating angles

Lubricate according to specifications

Replace u-joint kit

Reduce u-joint continuous running angle

Replace with higher capacity u-joint and driveshaft

Check u-joint flex effort -- replace joint or yoke if necessary

Clean and re lubricate u-joint

Realign to proper running angle -- minimum 1/2 degree

Torque bearing retention method to specificatio

 PROBLEM -- Slip Spline Wear

  • Seizure
  • Galling
  • Outside diameter wear at extremities and at 180 degrees
  • Spline shaft or tube broken in torsion 

Causes

Solutions

Improper lubrication

Worn or damaged part

Tube size inadequate

Excessive torque load for u-joints and driveshaft size

Male spline head engagement length too short for application

Excessive loose outside diameter fit

Slip member working in extreme extended or fully collapsed position

Contamination
Lubricate slip spline according to specifications

Replace with higher capacity u-joint and driveshaft

Check u-joint flex effort -- replace joint or yoke if necessary

Clean and re lubricate according to specification

Replace spline -- check design for application

Use Spicer Glidecote slip spline

Increase driveshaft assembly length to position slip spline head towards u-joint

Check for male slip member with longer spline

Use larger diameter tube
 
PROBLEM -- Shaft and/or Tube Failure 
  • Shaft support bearing wear or fracture
  • Shaft support rubber insulator wear or fracture
  • Tube circle weld fracture

     

 

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Causes

Solutions

Balance weight located in apex of weld yoke lug area

Balance weight too close to circle weld

Improper circle weld

Bending fatigue due to secondary couple loads

Driveshaft too long for operating speeds

Worn or damaged parts

Excessive torque load (shock loading) for u-joint and driveshaft size

Improper lubrication of bearings

Shaft support bearing misaligned -- interferes with slinger


Reduce u-joint continuous running angle

Replace with higher capacity u-joint and driveshaft

Install two piece driveshaft with shaft support bearing

Use larger diameter tube

Normal bearing wear -- replace

Realign mounting bracket to frame cross member to eliminate interference with slinger
 
PROBLEM -- Yoke Failure

 

  • Yoke broken in hub
  • Yoke broken at ear tip

     

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Causes

Solutions

Mating yoke lug interference at full jounce and rebound
Excessive torque load for u-joint and driveshaft size
Improper shaft length and slip
Bending fatigue due to secondary couple loads

Reduce u-joint continuous running angles
Replace with higher capacity u-joint and driveshaft
Replace yoke -- check design for application
Use wide angle yokes
Check installed lengths and adjust driveshaft length to provide proper slip conditions

Other Driveline related issues:

Driveline Angle

Driveline Field Problems

Driveline replacements

Driveline parts 

 
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