330D, 336D and 340D Excavators Hydraulic System – Cylinder Drift – Check – Loaded Bucket

Specification

Table 1
“Cylinder Drift – Check (Loaded Bucket)”    
Item     New     Rebuild     Service Limit     Actual    
Boom Cylinder     6.0 mm (0.24 inch) or less     12.0 mm (0.47 inch) or less     24.0 mm (0.94 inch) or less        
Stick Cylinder     12.0 mm (0.47 inch) or less     18.0 mm (0.71 inch) or less     30.0 mm (1.18 inch) or less        
Bucket Cylinder     18.0 mm (0.71 inch) or less     27.0 mm (1.06 inch) or less     45.0 mm (1.77 inch) or less        

Introduction

The performance level of the cylinder, the cylinder seals, and the overload relief valves for the implements can be determined with the following procedure.

Note: The machine configuration that is used during this test can affect the results of this test. Refer to Testing and Adjusting, “Operational Checks” for the machine configurations that were used for this test.

Note: The relief valve pressure settings must be set to the relief valve pressure specification before performing this operational check. Refer to Testing and Adjusting, “Specifications”.

Required Tools

Table 2
Required Tools    
Description     Qty    
Measuring Tape     1    
Stopwatch     1    

Test Procedure

Illustration 1 g00298378
  1. Position the machine on level ground. Refer to Illustration 1.
  1. Load the bucket.

    Weight of bucket load

    336D … 2520 kg (5550 lb)
  1. Raise the boom until the top stick pin is the same height as the boom foot pin.
  1. Fully extend the bucket cylinder.
  1. Fully retract the stick cylinder.
  1. Extend the stick cylinder rod 70 mm (2.8 inch) from the fully retracted position.
  1. Measure each cylinder length from cylinder pin to cylinder pin.
  1. Stop the engine.
  1. Leave the machine in this position for 3 minutes. Measure each cylinder length from cylinder pin to cylinder pin for drift.