Wrong Resistor May be Installed into 176-9668 Instrument Console Gp on Certain Excavators and Wheel Loaders {1408, 1437, 6129} Caterpillar

Excavator

Large Excavators 345B-385B

Medium Excavators 320D-336D

Wheel Loader

All Large Wheel Loaders

All Medium Wheel Loaders

Introduction

The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution that is identified below.

176-9668 Instrument Console Gp is part of SB-24 Volt operating system.

SB-24 Volt operating system for hydraulic (CW) dedicated wedge lock quick couplers on certain excavator machines.

SB-24 Volt operating system for hydraulic vertical wedge lock and Horizontal pin lock quick couplers on certain wheel loaders.

Problem

176-9668 Instrument Console Gp BCU V5.00 may have ex-factory installed the wrong resistor, 22 Ohm instead of 0,22 Ohm. As result, no output signal will be sent to the solenoid to unlock the SB-24 Volt operating system.

Caterpillar is aware of this problem, and recommends the following below interim repair action.

Solution

Show/hide table

Illustration 1	g06423726
Instrument Console Gp

1. Remove the four locking bolts to remove the cover of the Instrument Console Gp.
   Show/hide table

   Illustration 2	g06419788
   Incorrect resistor

   Show/hide table

   Illustration 3	g06419787
   Correct resistor

2. Visually inspect if the correct resistor is installed.

3. Replace 176-9668 Instrument Console Gp when the wrong resistor is installed.

4. Check if the correct resistor is installed into the new 176-9668 Instrument Console Gp before installation into the cab of the host machine.

Refer to GEBI0305 for more information about the SB operating system. The media number is available on the custom work tools website. The link shown on SIS web under additional service information.