The Service Brake Solenoid May Not Release on Certain Track-Type Tractors and Pipelayers{4307, 5051} Caterpillar

Pipelayer:

PL72 (S/N: P721-UP)

Track-Type Tractor:

D10T2 (S/N: RAB1-UP; JJW1-UP)

D5R Series 2 (S/N: R5A1-UP)

D6N (S/N: MG51-UP; GB61-UP)

D6R Series 2 (S/N: PPP1-UP; SSS1-UP; TTT1-UP)

D6T (S/N: SGA1-UP; RAD1-UP; STE1-UP; MEL1-UP; WRN1-UP; KMR1-UP; WES1-UP; SGT1-UP; TMY1-UP; HTZ1-UP; CR31-UP; CG81-UP)

D8T (S/N: FMC1-UP)

D9T (S/N: REX1-UP)

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.

Problem

Illustration 1	g03890060

The 268-8210 Solenoid Valve Gp is the service part for the brake dump solenoid valve on certain Track-Type Tractors and Pipelayers. If this solenoid is installed on the machine, the brake may not fully release due to small orifice (A) .

Solution

Illustration 2	g03890064

Install a new 437-2898 Solenoid Valve Gp (3) into reused 254-0072 Coil (2). Tighten solenoid valve (1) to 34 N·m (25 lb ft). Reuse 114-2772 Nut and tighten to 8 N·m (6 lb ft)