Drive Trainer Knowledge Base
Drive Trainer / Automatic Transmissions
 

Automated Manual Transmissions Common Installation Issues

DT#46461

Contamination Issue # 1

Symptom
  1. Decreased engine performance
  2. Shifting erratically
  3. Sticking valves
  4. Excessive heat
  5. Repeat failures
Cause
Contamination caused by not properly flushing the cooler
Preventative Action
Flush the transmission cooler as part of the installation process

Contamination Issue # 2

Symptom
  1. Excessive heat
  2. Premature bearing failure
  3. Oil breakdown
  4. Grinding in high & low
  5. Oil leaking from breather
Cause
Defective cooler Contamination due to not flushing cooler Mixed lubricants Antifreeze or water in heat exchanger leaking into transmission Glyco causes synchro lining to come off
Preventative Action
Flush system prior to installing the remanufactured unit. Utilize a new oil cooler and/or heat exchanger


Flashing the Unit

Symptom
  1. Hard up-shifting and down-shifting
  2. Shifting erratically
  3. Transmission fault code light on
Cause
Failure to perform transmission “relearn” and reset all parameters on newly installed remanufactured
Preventative Action
Perform reflash and address all fault codes prior to putting the vehicle in service.


PTO Interface

Symptom
  1. Hard shifting
  2. Noise
  3. Premature transmission failure
Cause
Improper cleaning of used PTO Failure to use a new PTO reseal kit Failure to set backlash properly (.006-.012)
Preventative Action
Clean PTO inside and outside. Inspect for wear, replace seal. Mount using PTO gasket shims & cooper washers on bolts



Vibration & Leaks

Symptom
  1. Output shaft endplay
  2. Failed output bearing
  3. Vibration & leaking
Cause
End yoke not torqued to correct specification Not using correct torque tool
Preventative Action
Upon install, check for proper torque & worn splines Install a new yoke if necessary Torque to OE specification using proper tool


Lubrication

Symptom
  1. Noise
  2. Excessive heat
Cause
Failure to use approved lubricants Failure to top off lubricants Failure to road test and recheck Mixed fluids in system
Preventative Action
Follow recommended practices Know approved lubricants for all Drive Train components

Driveline & Suspension

Symptom
  1. Vibration
  2. Noise
  3. Grinding
  4. Component failure
Cause
Failure to inspect driveline and suspension components for systems deficiencies
Preventative Action
Perform inspection prior to putting the vehicle in service Practice standard maintenance intervals


Component failures due to vibration - vibration caused by faulty driveline/suspension


Categories

Search Drive Trainer