| drivetrain doctors | we help you solve the problem! | |
Driveline Troubleshooting |
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| drivetrain doctors | we help you solve the problem! | |
Driveline Troubleshooting |
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PROBLEM -- Vibration
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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 phasing |
PROBLEM -- Premature Wear
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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 specification |
PROBLEM -- Slip Spline Wear
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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
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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
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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 |
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