TUBE AS 3862491 - Caterpillar

Torque Converter
PROBLEM: Torque converter gets hot. PROBABLE CAUSE:1. Low oil level.2. Low water level in engine radiator.3. Restrictions in oil cooler or oil lines.4. Too much operation of machine at or near stall speed (overload).5. Too much oil in the converter housing around the converter because of: a. Too much oil leakage inside the converter.6. Not enough oil to the converter because of: a. Oil pump failure.b. Too much leakage in transmission.Troubleshooting Electric Controls
ELECTRONIC SHIFT CONSOLEWhen a DIRECTION and SPEED SELECTOR is moved to a direction and speed, normally the transmission will engage the correct direction clutch and speed clutch. When it does not, there is a problem which can be in the four solenoids, the wiring harnesses and connectors, or the direction and speed control unit on the steering column.When there is a problem, check the operation of the solenoids first.M-1 Solenoid
Should the M-1 solenoid fail to energize (open), the problem (failure) would show up only when the operator tries to operate the machine in reverse.M-2 Solenoid
Should the M-2 solenoid fail to energize (open), it would show up only in FIRST SPEED (FORWARD or REVERSE). Failure of the M-2 solenoid to energize would cause the third (K3) speed clutch to engage instead of the first (K1) speed clutch. The machine would go forward or in reverse, but would not have as much power in third speed as it would in first speed.M-3 Solenoid
Should the M-3 solenoid fail to energize (open), the FORWARD or REVERSE direction clutches would not engage and the machine would not move.M-4 Solenoid
Should the M-4 solenoid fail to energize (open), the transmission would operate in THIRD SPEED (FORWARD or REVERSE) only, regardless of what speed position the direction and speed selector is moved to (except neutral).Operational Check Of Solenoids
To Check Operation Of M-1, M-2 And M-3 Solenoids
With the engine running, move the direction and speed selector from NEUTRAL to FIRST SPEED-REVERSE. If the transmission shifts and causes the machine to move in the REVERSE direction, the M-1 and M-3 solenoids are energizing and operating correctly. If the transmission is in FIRST SPEED (SLOW WITH POWER) rather than THIRD SPEED, the M-2 solenoid is operating correctly.To Check Operation Of The M-4 Solenoid
In order to check the M-4 solenoid, move the speed selector to the SECOND SPEED position. If the M-4 solenoid energizes, the transmission will upshift to SECOND SPEED. Should the transmission shift to THIRD SPEED, the M-4 solenoid is not energizing and has failed.When a solenoid is suspected of having failed, there are several checks to be made before replacing it. Check to be sure: the wire clip from the wiring harness to the solenoid is making contact; the pins and sockets in the circular connector are clean and making contact.Transmission Pressure Adjustment
When tests and adjustments are made to the torque converter, the parking brake must be OFF. To prevent movement of the machine and personal injury do the procedure that follows.
1. Lower the bucket to the ground.2. Put blocks in front of and