PIN AS 3038571 - Caterpillar

Dampers With Sampling Ports
Illustration 1 g03845581Some dampers have ports for fluid samples. If the damper has no external damage, collect a sample of the damper fluid. The fluid should be analyzed in order to check for a loss of viscosity. Use the results of the analysis to determine if the damper should be rebuilt or replaced. Kits for fluid samples are available from the address that follows. Return the kits to the same address for analysis.Hasse & Wrede GmbH
Georg-Knorr-Straße 4
12681 Berlin
Germany
Phone +49 30 9392-3135
Fax +49 30 9392-7-3135
Alternate phone +49 30 9392-3156
Alternate fax +49 30 9392-7-3156
The typical limit for the degradation of the damper fluid viscosity that is used by Hasse & Wrede GmbH is 20 percent for most applications. The reports from Hasse & Wrede should indicate that the fluid samples meet this viscosity limit.Dampers Without Sampling Ports
Some dampers do not have a port for a fluid sample. These dampers must be rebuilt or the dampers must be replaced when one of the following criteria has been met:
The damper has been operated for 20000 hours.
The engine is undergoing a major overhaul.Removal and Installation
Refer to the Disassembly and Assembly Manual, "Vibration Damper - Remove and Install" article or consult your Cat dealer for information about damper replacement.