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Answered in 4 hours by:
12/18/2012
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 4,155
Experience: Field service technician for CAT 19 years.
Verifiedcatmastertech :
| Speed Range and Direction of the Machine | Energized Solenoids | Engaged Clutches |
| First Speed Forward | 3 and 4 | 1 and 6 |
| Second Speed Forward | 3 and 5 | 1 and 4 |
| Third Speed Forward | 3 and 6 | 1 and 5 |
| Fourth Speed Forward | 1 and 6 | 2 and 5 |
| Neutral | - | - |
| First Speed Reverse | 2 and 4 | 3 and 6 |
| Second Speed Reverse | 2 and 5 | 3 and 4 |
| Third Speed Reverse | 2 and 6 | 3 and 5 |
catmastertech :
The above table provides the combination of the energized solenoids and of the engaged clutches for each forward speed and for each reverse speed.
catmastertech :
CHECK THE SHIFT LEVER.
- The ECM and the shift lever remain connected to the wiring harness.
- The disconnect switch and the key start switch are in the ON position.
- The remote direction switch is in the NEUTRAL position.
- Place the shift lever is in the position with the problem, if known.
- At the harness connector for the ECM, measure the voltages from contact 2 (wire 202-BK) to the following contacts at the shift lever:
- Contacts 1 to 8 (8 Pin Connector)
- Contacts 1,2, 5, and 6 (6 Pin Connector)
- Contacts 1,2, and 3 (4 Pin Connector)
- Contacts 1 to 8 (8 Pin Connector)
- Compare the measurements with the following tables.
catmastertech :
| FNR Switch | Shift Lever Pos. | Key Start Switch Pos. | 1st Gear | 2nd Gear | 3rd Gear | 4th Gear | Start Relay | Neut. Out | Rev Out | Fwd Out |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |||
| 8 Pin | 8 Pin | 8 Pin | 8 Pin | 8 Pin | 8 Pin | 8 Pin | 8 Pin | |||
| VDC | VDC | VDC | VDC | VDC | VDC | VDC | VDC | |||
| N | 1F | Run | 0.11 | 3.53 | 3.53 | 3.53 | 0.02 | 3.54 | 3.52 | 0.11 |
| N | 2F | Run | 3.53 | 0.11 | 3.53 | 3.53 | 0.02 | 3.54 | 3.51 | 0.11 |
| N | 3F | Run | 3.53 | 3.53 | 0.11 | 3.53 | 0.02 | 3.53 | 3.51 | 0.11 |
| N | 4F | Run | 3.53 | 3.53 | 3.53 | 0.11 | 0.02 | 3.54 | 3.51 | 0.11 |
| N | N | Run | 0.11 | 3.51 | 3.51 | 3.51 | 27.05 | 0.11 | 3.49 | 3.51 |
| N | 1R | Run | 0.11 | 3.53 | 3.53 | 3.53 | 0.02 | 3.53 | 0.11 | 3.53 |
| N | 2R | Run | 3.53 | 0.11 | 3.53 | 3.53 | 0.02 | 3.53 | 0.11 | 3.53 |
| N | 3R | Run | 3.53 | 3.53 | 0.11 | 3.53 | 0.02 | 3.53 | 0.11 | 3.53 |
catmastertech :
| FNR Switch | Shift Lever Pos. | Key Start Switch Pos. | Fwd Switch In | Rev Switch In | Neutral Switch Input |
| 1 | 2 | 3 | |||
| 4 Pin | 4 Pin | 4 Pin | |||
| VDC | VDC | VDC | |||
| N | 1F | Run | 27.93 | 27.93 | 0.03 |
| N | 2F | Run | 27.93 | 27.93 | 0.02 |
| N | 3F | Run | 27.93 | 27.93 | 0.02 |
| N | 4F | Run | 27.93 | 27.93 | 0.02 |
| N | N | Run | 27.94 | 27.94 | 0.03 |
| N | 1R | Run | 27.92 | 27.92 | 0.03 |
| N | 2R | Run | 27.92 | 27.92 | 0.03 |
| N | 3R | Run | 27.92 | 27.92 | 0.03 |
catmastertech :
Expected Result:
The voltage that is measured is within the specification of ± 0.10 VDC. See the tables that are provided.
Results:
- OK -The voltage that is measured is within the specification of ± 0.10 VDC. Proceed to test step 5.
- NOT OK -One or more of the measured voltages are NOT within the specification. Inspect the wiring harness from the ECM to the shift lever. Check for damaged components or loose connections in the harness.
Repair:Ensure that the fuse and the circuit breaker for the transmission controls are in the proper working condition. Inspect the ground strap for the ECM. Verify that the ground strap is secure and undamaged. There should be continuity in the wiring harness between the shift lever and the ECM for the power and ground circuits. Repair any failed components or replace any failed components with the recommended Caterpillar parts.
Stop.
catmastertech :
Shift lever are common failures. They above information is for a 4YS serial number prefix machine.
catmastertech :
If you need more help, I will be back online in the evening US eastern time.
Customer:
Hi.
Customer:
Machine serial number is XXXXX the above apply the same way?Cheers
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 4,155
Experience: Field service technician for CAT 19 years.
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