568 Forest Machine Hydraulic System Operational Checks Caterpillar


Operational Checks
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The operational checks can be used to find leakage in the system and components that are not functioning correctly. The speed of rod movement or the torque on a motor can be used to check the condition of the cylinders, motors, and the pumps.

Perform the following operational checks in order to troubleshoot problems concerning the hydraulic circuits and components on the machine.

  • Testing and Adjusting, "Engine Performance - Test (Engine Speed)"

  • Testing and Adjusting, "Travel on Level Ground - Test"

  • Testing and Adjusting, "Travel on Level Ground - Test (Optional Test)"

  • Testing and Adjusting, "Machine Drift on a Slope - Check"

  • Testing and Adjusting, "Swing Speed and Overswing on Level Ground - Check"

  • Testing and Adjusting, "Swing Speed and Swing Drift on a Slope - Check"

  • Testing and Adjusting, "Cylinder Drift - Check (Empty Bucket)"

  • Testing and Adjusting, "Cylinder Drift - Check (Loaded Bucket)"

  • Testing and Adjusting, "Cylinder Speed - Check"

The specifications that are listed in tables for the operational checks are calculated average values. The values will vary due to the configuration of the machine and engine speed. Table 1 contains the machine configurations that were used in order to obtain these specifications.

Reference: Refer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for the specifications for engine speed.

Table 1
Machine Configuration 
Sales Model  Boom  Stick  Bucket 
568 GF  REACH  R3.9DB   
568 LL  MASS  R3.5DB   
568 LL  LL  U/U  U/U 

Information System:

330D and 336D Excavators and 336D Mobile Hydraulic Power Units Maintenance Interval Schedule
336E Excavator and 336E MHPU Mobile Hydraulic Power Unit C9.3 Engine Supplement Crankshaft Front Seal - Remove and Install
Installation of the 281-8245 Auxiliary Hydraulic Lines Gp on Certain Hydraulic Excavators {5057, 5057}
568 Forest Machine Hydraulic System Specifications
568 Forest Machine Hydraulic System Relief Valve (Swing) - Test and Adjust
568 Forest Machine Hydraulic System Swing Motor - Test - Measurement of Case Drain Oil
568 Forest Machine Hydraulic System Relief Valve (Line) - Test and Adjust
336E Excavator and 336E MHPU Mobile Hydraulic Power Unit C9.3 Engine Supplement Crankshaft Vibration Damper and Pulley - Remove and Install
336E Excavator and 336E MHPU Mobile Hydraulic Power Unit C9.3 Engine Supplement Water Pump - Remove and Install
336E Excavator and 336E MHPU Mobile Hydraulic Power Unit Machine Systems Bucket Linkage - Remove and Install
349F and 352F Excavators Hydraulic System Relief Valve (Swing) - Test and Adjust
Installation of the 260-7976 Pilot Lines Gp on Certain 320Dand 323D Excavators{5057, 5059}
568 Forest Machine Hydraulic System Travel on Level Ground - Test
568 Forest Machine Hydraulic System Travel on Level Ground - Test - Optional Test
568 Forest Machine Hydraulic System Swing Speed and Overswing on Level Ground - Check
725C, 725C2, 730C, 730C Ejector, 730C2, 730C2 EJ, 735B, 735C, 740B, 740B Ejector, 740C Ejector and 745C Articulated Trucks VIMSTM 3G Electrical Connector - Inspect
2010/04/28 Improved Grapple Stick Pins for the G100B Series Contractor Grapples {6307}
336E Excavator and 336E MHPU Mobile Hydraulic Power Unit C9.3 Engine Supplement Refrigerant Compressor - Remove and Install
336E Excavator and 336E MHPU Mobile Hydraulic Power Unit Machine Systems Refrigerant Receiver-Dryer - Remove and Install
349F and 352F Excavators Hydraulic System Relief Valve (Crossover) - Test and Adjust
336E Excavator and 336E MHPU Mobile Hydraulic Power Unit C9.3 Engine Supplement Refrigerant Condenser - Remove and Install
Installation of the 300-1190 Auxiliary Hydraulic Lines Gp {5057}
MP15, MP20, MP30 and MP40 Multi-Processors Plate Locations and Film Locations
349E Excavator Hydraulic System Travel Motor - Test - Measurement of Case Drain Oil