CASE AS 2784406 - Caterpillar

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 g06208294
Typical example
Hydraulic cylinder group
(A) O-Ring sealReports have been received that the oil may leak at the o-ring seal between the cylinder head and barrel on the machines listed above.Solution
In the event of failure, replace with the same 340-9308 O-Ring Seal, 340-9311 O-Ring Seal, 340-9314 O-Ring Seal, 340-9323 O-Ring Seal, and 351-2187 O-Ring Seal.In the event of hydraulic oil leak, report through the CPI feedback tool in Service Information Management System (SIMSi) referencing CPI number 383462. Also add any comments or images which help to understand the root cause.