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Symptom Chart - Transaxle

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Symptom Chart - Transaxle

Condition Possible Sources Action
  • Noisy in forward gears - While verifying the condition, determine whether the noise is a gear roll over noise, release bearing rub or some other transmission-related noise. Gear roll over noise, inherent in manual transmissions, is caused by the constant mesh gears turning at the engine idle speed while the clutch is engaged and the transmission is in NEUTRAL. Gear roll over noise will disappear when the clutch is disengaged or when the transmission is engaged in gear. Release bearing rub is sometimes mistaken for mainshaft bearing noise. Release bearing rub will disappear when the clutch is engaged. In the event that a bearing is damaged, the noise is more pronounced while engaged in gear under load or coast than in NEUTRAL
  • Lubricant
  • ADD specified lubricant as necessary.
 
  • Components grounding out on the transaxle
  • CHECK for screws, bolts or other components grounding out. CORRECT as required.
 
  • Component housing bolts
  • CHECK the torque on the transaxle-to-clutch housing bolts and the clutch housing-to-engine block bolts. TIGHTEN the bolts to specification. REFER to MANUAL TRANSAXLE/TRANSMISSION article.
 
  • Bearings or gears
  • INSPECT the bearings. INSPECT the gears and gear teeth for wear or damage. INSTALL new components as necessary. REFER to MANUAL TRANSAXLE/TRANSMISSION article.
  • Gears clash when shifting from one forward gear to another
  • Clutch not fully releasing
 
  • Transaxle input shaft pilot bearing worn/damaged
  • INSPECT the transaxle input shaft pilot bearing for wear and damage. REPAIR as necessary.
 
  • Gear teeth and/or synchronizer
 
  • Engine idle speed too high
  • Transaxle jumps out of gear
  • Excessive gearshift lever boot tension
 
  • Transaxle-to-engine mounting bolts
 
  • Internal components
  • INSPECT the synchronizer sleeves for free movement on their hubs. INSPECT the synchronizer blocking rings for widened index slots, rounded clutch teeth and a smooth internal surface. CHECK the countershaft cluster gear for excessive end play. CHECK the shift forks for worn or loose mounting on the shift rails. INSPECT the synchronizer sliding sleeve and the gear clutch teeth for wear or damage. REPAIR or INSTALL new components as necessary.
 
  • Gear teeth worn or damaged
  • Transaxle will not shift into one gear - all others OK
  • Manual shifting components
 
  • Reversing lamp switch ball
  • If REVERSE is the problem, CHECK the reversing lamp switch for the ball frozen in the extended position.
 
  • Internal components
  • INSPECT the shift rail and fork system, the synchronizer system and the gear clutch teeth for restricted travel. REPAIR or INSTALL new components as necessary.
  • Transaxle is locked in one gear and cannot be shifted out of that gear
  • Internal components
  • INSPECT the problem gears, the shift rails, the forks and the synchronizer for wear or damage. REPAIR as necessary. REFER to MANUAL TRANSAXLE/TRANSMISSION article.
 
  • Fork on rail
  • Transaxle leaks
  • Lubricant
  • CHECK the fluid level and type.
 
  • Other components leaking
  • IDENTIFY the leaking fluid as engine, power steering or transaxle fluid. REPAIR as required. REMOVE all traces of fluid on exposed transaxle surfaces. CHECK the vent for free breathing. OPERATE the transaxle and INSPECT for new leakage. REPAIR as necessary.
 
  • Internal components
  • INSPECT for leaks at the input shaft bearing retainer seal and the shift rail expansion plug. REFER to MANUAL TRANSAXLE/TRANSMISSION article. INSPECT for leaks at the transaxle case-to-clutch housing seam. INSPECT the case for sand holes or cracks. REPAIR as necessary. REFER to MANUAL TRANSAXLE/TRANSMISSION article.
 
  • Fill and drain plugs
  • CHECK the fill plug, the drain plug and the bore threads. REPAIR as necessary. TIGHTEN to specification. REFER to MANUAL TRANSAXLE/TRANSMISSION article.
 
  • Transaxle case bolt
 
  • Halfshaft oil seals
  • CHECK for cracked, loose or damaged RH intermediate shaft oil seal or LH halfshaft oil seal. INSTALL new seals as necessary. REFER to MANUAL TRANSAXLE/TRANSMISSION article.
  • Bearing failure
  • Other part failure
  • Raceways or rollers
  • Lubricant
  • REMOVE, CLEAN and DISASSEMBLE the transaxle, then INSTALL new bearings as necessary. (It is necessary to RESET the bearing preload if any tapered bearings are installed.) REFER to MANUAL TRANSAXLE/TRANSMISSION article.
 
  • Vibration break up of retainer and brinelling of races
  • Bearing(s)
  • Shafts or bore
  • Overloading of vehicle
  • Incorrect preload
  • DETERMINE and CORRECT the cause of the vibration.
 
  • Input shaft oil dam
  • INSTALL new components and verify correct oil dam installation. REFER to MANUAL TRANSAXLE/TRANSMISSION article. CHECK for correct installation of the snap ring on the mainshaft next to the oil dam.
 
  • Oil baffle in the input bearing shim pack