HOOD,ENG AS 0937720 - Caterpillar

Check The EMS System First
1. Check for a faulty gauge or sender. Install a calibrated thermistor thermometer near the sender and stall the converter until the temperature reaches 127-133°C (260-270°F). The EMS warning light should flash, and if the tractor is equipped with an attachment gauge, the reading should be the same as the thermistor thermometer.2. If the warning light flashes before the temperature reaches 127-133°C (260-270°F), install a new sender. If the attachment gauge shows more than 5° difference than the thermistor thermometer, install a new gauge and/or gauge sender.Observe Machine On The Job
1. Operating the machine in a gear that is too high and near the converter stall speed causes the converter to operate inefficiently and generate excessive heat. Also, continuous operation in low gear near the stall speed generates excessive heat in the converter.2. If this type of operation is observed, ask the operator to modify his operating technique.Engine Coolant Too Hot
If the engine coolant is too hot, the power train oil cooler does not have the capacity to remove the heat that needs to be removed from the oil. So, the oil temperature increases. Make the following checks ("Know Your Cooling System" contains many more checks): 1. Check coolant level. If low, add coolant until the level reaches the full mark in the filler spout.2. Check fan belt tension. If the belts are loose, replace them.3. Check temperatures of the radiator top and bottom tanks. See "Know Your Cooling System". If the temperature(s) are too high, determine if the cause is in the engine or in the engine cooling system, and correct the problem.
Failures In The Power Train System
1. Is the oil level low? If so, find out why. Add oil to bring the level up to the full mark on the dipstick or sight glass.2. Check the charging pump pressure at high idle rpm. If the pressure is less than 2750 kPa (400 psi), the pump may be worn.3. Check converter outlet pressure. If the pressure is low, disassemble the converter outlet valve and check for a broken spring or foreign material which could prevent correct operation.
Illustration 1. Oil and water flow through the power train oil cooling system. The hydraulic oil cooler is optional.4. Check transmission lubrication pressure. If low, there may be an oil leak upstream from the pressure tap.5. Check the operation of both scavenge pumps. If a scavenge pump is not functioning properly, the compartment will flood with oil and the components rotating in the oil will cause excessive heat.6. Check flow of oil through the cooler with the hydraulic flow meter. The flow rate should be 146 liter/min (38.5 U.S.gpm) at an oil temperature of 93°C (200°F) at 1900 engine rpm. See Illustration 1 for oil flow through the power train cooler. For purposes of discussion later on, Illustration 1 also shows the attachment hydraulic oil cooler. The rate of oil flow through the power train cooler is the same with or without the hydraulic oil cooler.7. Note