Description

Liebherr R914 Compact, R920 Tier 4F Compact Excavator Service Manual

Excavator Model :
R 914 Compact (4f) 89078 and up (Type 1511)
R 920 Compact 43057 and up (Type 1705)
Language: English
Publication: 12214599
Format: PDF

Liebherr R914 Compact, R920 Excavator Service Manual – 1522 Pages
Operator’s manual – 330 Pages

Table of Content of the Service Manual:

• Introduction
• Technical data
• Maintenance
• Drive group
• Cooling system
• Working hydraulics
• Hydraulic components
• Steering System
• Brake System
• Electrical system
• Transmission /Travel gearbox
• Axles / Drive
• Steel components – basic machine
• Working attachment
• Operator’s cab, heating and air conditioning
• Lubrication system
• Slewing gearbox and slewing ring
  
• Equipment / options
• Diagnosis

This manual contains technical data, design and functional descriptions as well as instructions for the operation and the adjustment of machine settings. The document includes a number of drawings, functional schematics and detailed views of units and assemblies of Liebherr hydraulic excavators.

Manual Extract – Check for leak oil at the control blocks

The leak oil of a control spool is measured through the retracting and extending speeds of the pressurised hydraulic cylinder. The control spool is in neutral position and is connected to the hydraulic cylinder The volume of leak oil in the control block should be measured at a load pressure of 150 bar and a temperature of 50°C (in hydraulic tank).
Before checking the control block for leak oil, first check the secondary valves (visual inspection, with valve exchange, if this is required) and the operating cylinder (dummy), as the respective values refer only to leakage from the control spool in the control block.
To check the control block for leak oil from the control spool, connect a pressure sensor at the respective pressure line between the operating cylinder and the control block (use measuring equipment, if required).