Manitowoc Published 05-26-17, Control # 238-02 2-19
MLC165-1 SERVICE/MAINTENANCE MANUAL HYDRAULIC SYSTEM
Tightening Hydraulic Connections
• Make sure the fittings and O-rings being used are the
proper size and style.
• Flush sealing surfaces with clean hydraulic oil to remove
any dirt.
• Carefully inspect threads and sealing surfaces for nicks,
gouges, and other damage. Do not use damaged parts;
they will leak.
• Carefully inspect O-rings for cuts and other damage. Do
not use damaged O-rings: they will leak.
• Always lubricate O-rings when assembling onto the
fittings.
• Be careful not to cut O-rings when assembling them
onto fittings. Use a thimble as shown in Figure 2-18
when assembling O-ring over threads.
O-Ring
Plastic or Metal
Thimble Covering Threads
Figure 2-18. O-ring Assembly with Thimble
S103
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