A MORE DURABLE BRAKE PRESSURE SWITCH IS AVAILABLE FOR B-SERIES AND C-SERIES WHEELED EXCAVATORS Caterpillar


A MORE DURABLE BRAKE PRESSURE SWITCH IS AVAILABLE FOR B-SERIES AND C-SERIES WHEELED EXCAVATORS

Usage:

A MORE DURABLE BRAKE PRESSURE SWITCH IS AVAILABLE FOR B-SERIES AND C-SERIES WHEELED EXCAVATORS

CONFIDENTIAL TIBU4279-00

TECHNICAL INFORMATION BULLETIN

August 4, 2004

Wheeled Excavators

M312 (6TL1-Up)
M315 (7ML1-Up)
M318 (6ES1-Up, 8AL1-Up, 8SS1-Up)
M320 (6WL1-Up, 9PS1-Up)
M313C (BDR1-Up)
M315C (BDM1-Up)
M316C (BDX1-Up)
M318C (BCZ1-Up)
M318C MH (BEB1-Up)
M322C (BDK1-Up)
M322C MH (BDY1-Up)

M325C MH (XJA1-Up, PAN1-Up)

 

Component Code(s) 1435-px, 5057

SUBJECT: A MORE DURABLE BRAKE PRESSURE SWITCH IS AVAILABLE FOR B-SERIES AND C-SERIES WHEELED EXCAVATORS

PROBLEM:

The 8U-2158 Pressure Switch and the 163-2084 Pressure Switch that are used on the B-Series and C-Series Wheeled Excavators in order to switch the brake lights on and off will fail. The switches fail due to soot build-up that forms on the contacts inside the switches.

SOLUTION:

The 8U-2158 Pressure Switch and the 163-2084 Pressure Switch have an improved service-replacement switch assembly in order to prevent future failures. The new 252-6677 Pressure Switch has
self-cleaning contacts, which prevents soot build-up.

The old switches are used in other circuits on the wheeled excavator models where the new 252-6677 Switch assembly is also operational.

In instances where the 163-2084 Pressure Switch is being replaced, the terminal numbers for the wiring harness are unchanged. However, in cases where the 8U-2158 Pressure Switch is being replaced the wires connected to the 8U-2158 Pressure Switch are to be connected to terminals 1 and 4 on the 252-6677 Pressure Switch.

Note: It does not matter which wire is on terminal 1 and which wire is on terminal 4. Also, it is not necessary to use the ground terminal on the 252-6677 Pressure Switch in either case.

COPYRIGHT 2004 CATERPILLAR
ALL RIGHTS RESERVED

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