Installation of 7W2743 Speed Switch Assembly{7427} Caterpillar


Installation of 7W2743 Speed Switch Assembly{7427}

Usage:

Information for equipment:


ELECTRICAL AND STARTING SYSTEM
BATTERY GP

Coolant/Battery Tester Group Quickly Tests Coolant and Battery Acid {0773, 0785} 2004/12/01

Incorrect Connection Of Battery Charger Can Open Circuit Breaker And Damage Woodward 2301 Governor Control 1986/04/01
Heavy-Duty Line Of Batteries Available To U.S. Dealers 1986/09/01
5P957 And 5P3514 Coolant And Battery Tester 1987/04/01
Be Sure Battery Cable To Starter Connection Has Correct Torque 1988/03/01
Safety Vent Caps For Caterpillar Batteries 1977/07/13
Coolant/Battery Tester Group Quickly Tests Coolant and Battery Acid {0773, 0785} 2004/12/01

Installation of 7W2743 Speed Switch Assembly{7427} Installation of 7W2743 Speed Switch Assembly{7427}
Use of the 4C6534 Speed Switch Calibration Harness{0781, 0785} Use of the 4C6534 Speed Switch Calibration Harness{0781, 0785}
Retrofit Installation of Coolant Loss Sensor{1353, 1395, 7422, 7470} Retrofit Installation of Coolant Loss Sensor{1353, 1395, 7422, 7470}
Use Of 6V3025 Battery Cable Repair Kit{0613, 1400} Use Of 6V3025 Battery Cable Repair Kit{0613, 1400}
Battery Ratings And Cross Reference Chart{1401} Battery Ratings And Cross Reference Chart{1401}
Battery Test Procedure {1401} Battery Test Procedure {1401}
Installation Procedure on Installing the Battery State of Charge/Health Kit on All Caterpillar and Non-Caterpillar Diesel Engines {1401, 1408, 4823} Installation Procedure on Installing the Battery State of Charge/Health Kit on All Caterpillar and Non-Caterpillar Diesel Engines {1401, 1408, 4823}

Certain 7N4160 Switch Groups And 9W1077 Switch Assemblies Need To Be Removed From Parts Stock Certain 7N4160 Switch Groups And 9W1077 Switch Assemblies Need To Be Removed From Parts Stock







Recommendations for Battery Charging and Temperatures for Machines and Generator Sets{1401, 751B} Recommendations for Battery Charging and Temperatures for Machines and Generator Sets{1401, 751B}
Process for Communicating an Incident with a Battery{1401} Process for Communicating an Incident with a Battery{1401}

Certain 7N4160 Switch Groups And 9W1077 Switch Assemblies Need To Be Removed From Parts Stock Certain 7N4160 Switch Groups And 9W1077 Switch Assemblies Need To Be Removed From Parts Stock



Maintenance Free Batteries{1401} 1986/03/10
Incorrect Connection Of Battery Charger Can Open Circuit Breaker And Damage Woodward 2301 Governor Control{1400,1401,4450} 1986/03/24
Requirements For Shipping Wet Batteries In The U.S.{1401,7500} 1986/04/07
Heavy-Duty Line Of Batteries Available To U.S. Dealers{1400,1401} 1986/09/01
Safety Vent Caps For Caterpillar Batteries{1401} 1977/07/11
5P957 And 5P3514 Coolant And Battery Tester{0786,1395,1401} 1987/03/23
Identification Of External Terminals On Alternators{1405,1406,1400} 1987/03/23
Alternator "R" Terminal Wire Assembly Available For Wiring Harness Repair{1408} 1987/05/04
Alternator/Generator Output Test On The Engine{1401,1404,1405,1406} 1987/05/04
Testing The Starter On The Engine{1401,1450} 1987/05/04
Be Sure Battery Cable-To-Starter Connection Has Correct Torque{1453} 1988/03/14
Maintenance-Free Batteries Require Different Troubleshooting Procedures{1401} 1988/06/20
Revised Instructions For Installation of New Maintenance Free Batteries{1401,1400} 1988/12/12
Fuse And Wire Assembly Is Available For Protection Of Earlier 6N5906 Service Meters{7480} 1979/01/29
New 35-Ampere Alternator Used On Some Engines In Caterpillar Equipment{1405,1406} 1979/08/13
Voltage Regulator Can Cause Variable Ammeter Indications{1410,1401,1405,1406,7467} 1979/10/22
Two Plug Assemblies (Booster Cables) Are Available To Start Machines{1401,1453} 1979/11/05
Batteries Can Be Damaged If Too Much Vacuum Is Used During Electrolyte Fill{1401} 1979/11/26
High Performance Maintenance Free Battery Available{1401} 1989/01/16
Limitations On Engine Cranking Time{1453,1401} 1989/03/27
Preventive Maintenance For Batteries{1401} 1989/03/27
Causes And Effects Of Low Battery Voltage On Electric Starters{1401,1453,1467} 1989/04/24
Procedure For Replacing Batteries Or Battery Cables {1401,1402,1411} 1989/05/01
Procedure For Replacing Batteries, Battery Cables Or Disconnect Switches {1401,1402,1411} 1989/05/01
Procedure For Replacing Batteries, Battery Cables Or Disconnect Switches {1401,1402,1411} 1989/05/01
Special Instruction, "Battery Charging Rate And Time Tables," Available On Oil Resistant Paper{0374,1401} 1989/06/19
Improved 9W1077 Start Switch Assembly And 7N4160 Heat Start Switch Group{1416} 1990/12/10
Identification Of External Terminals On Alternators {1405,1406,1400} 1998/12/07
Coolant/Battery Tester Group Quickly Tests Coolant and Battery Acid {0773, 0785} 2004/12/01


Introduction

The 7W2743 Speed Switch is used as a direct replacement for the 5N8947 Speed Switch, which has been cancelled.

Application and Installation of 7W2743 Speed Switch Assembly

1. The 7W2743 Speed Switch has an additional oil step function. For direct replacement of the 5N8947 Speed Switch, this third function is not used. For the same functions that are used on the 5N8947 Speed Switch, the 7W2743 Speed Switch has the same terminal numbers.
2. The 7W2743 Speed Switch is compatible with all magnetic pick-ups used with the former 5N8947 Speed Switch. Calibration of the 7W2743 Speed Switch is very similar to the former 5N8947 Speed Switch.
3. The 7W2743 Speed Switch will not shut down the engine, if a loss of the magnetic pick-up signal occurs. It will also not accept the wire harness cover that was mounted on the former 5N8947 Speed Switch.


ASOS = air shut-off solenoid; ESS = engine speed switch; FSOS = fuel shut-off solenoid; SR = slave relay

4. In electrical systems, where the speed switch contacts supply voltage directly to a shut-off solenoid, it is recommended to replace a failed 5N8947 Speed Switch with a 7W2743 Speed Switch and slave relay (1). Package generator sets with a generator-mounted control panel are equipped with a relay, so no additional slave relay is needed.
5. On 12V DC electrical systems, add a 302266 Relay; on 24V to 32V DC electrical systems, add a 9F3099 Relay.
6. The slave relay will be activated by the shut-down fault signal; the relay contacts will energize the solenoid (rather than the speed switch contacts).

7. The slave relay must be mounted with nose (2) and terminals (3) on the bottom.

When a 3N5984 Type 5 Control Panel is used (see Form SENR7968-03, Service Manual for SR4 Generator), the following wiring changes must be made on the 7W2743 Speed Switch.

NOTE: If these changes are not made, the engine oil pressure fault light on the control panel will come on whenever the engine is stopped.

1. Connect the light green wire from terminal 1 of the oil pressure switch (OPS) to terminal 13 (1).

2. Install a jumper wire from terminal 11 (2) to terminal 14 (3).

3. Disconnect the orange wire from terminal 2 of the time delay (TD) relay and from terminal 1 of the oil pressure switch (OPS) and tape both ends securely.

4. Add a #14 wire to the harness from terminal 2 of the time delay (TD) relay to terminal 10 (4) of the 7W2743 Speed Switch.

5. Adjust the oil step speed calibration (see Form SENR3202 Troubleshooting Guide [ETS]) to the same speed as the crank terminate speed setting (usually approximately 500 rpm). All speed switches should be calibrated as outlined in Form SENR3202, when they are installed in any application, except when the oil step feature is not used.

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