Circuit Breaker Harness Assembly {1420} Caterpillar

Circuit Breaker Harness Assembly {1420}

Usage:

769C 01X

Articulated Truck: All
Asphalt Paver: All
Backhoe Loader: All
Cold Planer: All
Compact Wheel Loader: All
Earthmoving Compactor: All
Electric Power Generation: All
Engine: All Gas Engines
Excavator: All
Forest Products: All
Integrated Toolcarrier: All
Landfill Compactor: All
Load Haul Dump: All
Machine Engines: All
Mini Hydraulic Excavator: All
Motor Grader: All
Off-Highway Truck/Tractor: All
Paving Compactor: All
Pipelayer: All
Road Reclaimer/Soil Stabilizer: All
Skid Steer Loader: All
Soil Compactor: All
Telehandler: All
Track-Type Loader: All
Track-Type Skidder: All
Track-Type Tractor: All
Truck Engines: All
Underground Articulated Truck: All
Wheel Dozer: All
Wheel Loader: All

Introduction

In order to ensure reliable operation of the circuit breakers (1), ensure that the harness assembly is properly secured to the circuit breakers (1). Loose connections can be the result of performing either of the following two actions:

Assembling the mounting hardware in the incorrect location
Applying the incorrect torque to the mounting hardware

An internal tooth star washer (5) that is located between the wire terminal (2) and the circuit breaker (1) provides the maximum torque retention for the connection.

Proper Assembly Technique

When an internal tooth star washer (5) is supplied with the circuit breaker (1), ensure that the star washer is placed between the wire terminal (2) and the circuit breaker (1).
When a flat washer (4) is supplied with the circuit breaker (1), ensure that the flat washer (4) is located between the wire terminal (2) and the screw (6).
Tighten the joint to the torque value that is recommended in Table 1. Table 1 shows some typical sizes for studs and screws that are found throughout the line of Caterpillar circuit breakers.
Reinstall fasteners in the original location.
Ensure that the harness is adequately secured
For the correct order of assembly for the hardware and the harness, refer to Illustrations 1 through 4.

Show/hide table

Table 1
Typical Sizes for Studs and Screws
Type	Thread Size	Torque⁽¹⁾	Tolerance
Stud	1/4-28	6 N·m (4.43 lb ft)	+/- 1 N·m (0.74 lb ft)
Stud	3/8-24	9 N·m (6.64 lb ft)	+/- 1 N·m (0.74 lb ft)
Stud	10-32	2.25 N·m (1.66 lb ft)	+/- .25 N·m (0.18 lb ft)
Screw	8-32	1.7 N·m (1.25 lb ft)	+/- .20 N·m (0.15 lb ft)

Show/hide table

⁽¹⁾	For accurate torque settings, use the 6V-4980 Torque Screwdriver Tool Group.

Show/hide table




Illustration 1	g03158416
Breaker with stud

Show/hide table




Illustration 2	g03159696
Breaker with drawing of screw (1) Circuit breaker (2) Wire terminal (3) Nut (4) Flat washer (5) Lockwasher ( Internal tooth star washer)