HOOD AS-ENGINE 3967691 - Caterpillar

Problem: Transmission does not operate in First speed Forward or Reverse.
Possible Causes:1. No. 5 clutch not engaged (slips) because of: a. Low oil pressure, or oil leakage.b. Discs and plates have too much wear.c. Clutch has parts that are broken.Problem: Transmission does not operate in Second speed Forward or Reverse.
Possible Causes:1. No. 4 clutch not engaged (slips) because of: a. Low oil pressure, or oil leakage.b. Discs and plates have too much wear.c. Clutch has parts that are broken.Problem: Transmission does not operate in Third speed Forward or Reverse.
Possible Causes:1. No. 3 clutch not engaged (slips) because of: a. Low oil pressure, or oil leakage.b. Discs and plates have too much wear.c. Clutch has parts that are broken.Problem: Transmission does not disengage (release) when the selection lever is in Neutral.
Possible Causes:1. Control linkage loose or adjustment not correct.2. Direction clutch is engaged, and does not release.Problem: Transmission engages but the machine does not move.
Possible Causes:1. Failure in final drives.2. Failure in steering clutches.3. Failure in transfer or bevel gears.4. Gears in the transmission will not move because of: a. Too many clutches are engaged.b. Mechanical failure in transmission.5. Mechanical failure in torque divider or converter.Problem: Transmission gets hot.
Possible Causes:1. Low oil level.2. High oil level.3. Cores of oil cooler not completely open.4. Low oil flow as a result of pump wear.5. Long periods of operation with converter at or near stall speed.6. Too much resistance between the plates and discs of the clutches when not engaged.Problem: Pump noise not normal.
Possible Causes:1. Loud sounds at short intervals that give an indication that particles are going through the pump. These can be caused by pump cavitation.2. A constant loud noise is an indication of pump failure.3. Air at the inlet side of the pump.Torque Divider
The information that follows must be used to diagnose problems in the torque divider. This information does not give every possible problem, but many of the common problems are given. The problem can be in the engine or transmission.Problem: Torque converter gets hot.
Possible Causes:1. Bad temperature gauge or sender.2. Long periods of operation with converter at or near stall condition.3. Cooling system operation not correct. a. Cores of oil cooler not completely open.b. Restriction in oil cooler lines.4. Low oil pressure. a. Low oil level.b. Converter ratio valve not operating correctly.c. Outlet relief valve not closing.d. Leakage around torque converter seals.5. Air in oil system.6. Bad scavenge pump.7. Screen in scavenge line not open.8. Mechanical failure in torque converter.Problem: High converter inlet pressure.
Possible Causes:1. Converter ratio valve not operating correctly.2. Restrictions in outlet relief valve.3. Restrictions in outlet line to oil cooler.Problem: Low inlet pressure.
Possible Causes:1. Bad converter charging pump.2. Converter ratio valve. a. Dirt or foreign material will not let valve close.3. Outlet relief valve. a. Spring too weak.b. Dirt or foreign material will not let valve close.4. Seal leakage in torque converter.Problem: Noises in torque converter that sound like metal in contact.
Possible Causes:1. Bearings that have too much wear or damage.2. Loose turbine, impeller