Improper Adjustment of the Hoist Relief Valve on Certain Off-Highway Trucks{5069, 5117} Caterpillar

Off-Highway Truck/Tractor:

773F (S/N: EED1-UP; EXD1-UP)

777D (S/N: AGC1-UP; FKR1-UP; 3PR1-UP; 2YW1-UP; AGY1-UP)

777F (S/N: WTK1-UP; JRP1-UP)

Quarry Truck:

775F (S/N: EYG1-UP; DLS1-UP)

Introduction

The problem that is identified in the technical information bulletin that follows does not have a known permanent solution. Until a permanent solution is known, use the solution that is identified below.

Problem

Complaints have been received that the hoist relief valve has lost the factory setting and was adjusted in the field.

Solution

The 106-7372 Relief Valve Gp , the 148-2962 Relief Valve Gp , and the 148-2963 Relief Valve Gp are the parts being adjusted in the field. Before any adjustments are made to the settings on three relief valve groups, have the dealer technical communicator contact the service engineer at the following address.

Submit a "SIMSi" entry on the situation.