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19. Basic Servicing Practices
3-10
• The hydraulic system is hot during and immediately after
operation. It is also under high pressure during opera-
tion. Therefore, check and service the hydraulic system
carefully as follows:
• Put the bucket on level ground so that no pressure is
applied to the hydraulic cylinder circuits.
• Be sure to stop the engine.
• Wait until the temperature drops sufficiently before
starting maintenance.
Do not suddenly remove any plugs, screws or connect-
ing parts of the hoses. Otherwise oil may spout out due
to residual internal pressure even when the oil tem-
perature has lowered. Be careful not to stand in front
of any plugs, screws or connecting parts when loosen-
ing them, to prevent injury. Loosen them gradually, to
relieve the internal pressure.
• Always relieve the internal pressure before checking
and servicing the hydraulic system.
• Check the hydraulic oil level, replace the filter element,
and replace the hydraulic oil when necessary.
• After removing hydraulic hoses and piping, check the O-
rings and the packing for damage before reinstalling
them.
Replace them if they are damaged.
• Bleed air after replacing or cleaning the hydraulic oil filter
element or strainer, repairing or replacing the hydraulic
equipment, or reinstalling the hydraulic cylinder or piping.
Bleed air according to the following procedure:
1) Set the engine rotation to medium. That is, set the lever in the middle of the stroke.
2) Slowly operate each cylinder 4 to 5 times to approximately 4 in. (100 mm) before both stroke ends.
3) Operate the cylinder 4 to 5 times at full stroke.
• Failure to bleed air from the hydraulic cylinder and operating it suddenly to the stroke ends could
cause piston seal damage.
• If air is left in the hydraulic circuit, it will compress and expand and the hydraulic equipment will not
operate smoothly.
Air in the hydraulic circuit may shorten the service life of the hydraulic pump.
4) Check the hydraulic oil level and replenish hydraulic oil to the specified level if necessary.
19-3. Hydraulic system
Retract the bucket and arm cylinders to place
the bucket on the ground.
Upper limit
Lower limit
020169-00E
Summary of Contents for Z17 GEN:2
Page 28: ...MEMO 1 16 Courtesy of Machine Market...
Page 40: ...MEMO 1 28 Courtesy of Machine Market...
Page 41: ...2 1 OPERATION Courtesy of Machine Market...
Page 128: ...MEMO 2 88 Courtesy of Machine Market...
Page 129: ...3 1 MAINTENANCE Courtesy of Machine Market...
Page 188: ...MEMO 3 60 Courtesy of Machine Market...
Page 189: ...4 1 SPECIFICATIONS AND DIMENSIONAL DIAGRAMS Courtesy of Machine Market...
Page 192: ...MEMO 4 4 Courtesy of Machine Market...
Page 193: ...5 1 OPTIONAL PARTS AND ATTACHMENTS Courtesy of Machine Market...
Page 196: ...MEMO 5 4 Courtesy of Machine Market...
Page 197: ...6 1 NOTES Courtesy of Machine Market...
Page 199: ...28 Maintenance Log 6 3 Date Machine hours Service performed Courtesy of Machine Market...
Page 200: ...28 Maintenance Log 6 4 Date Machine hours Service performed Courtesy of Machine Market...
Page 201: ...28 Maintenance Log 6 5 Date Machine hours Service performed Courtesy of Machine Market...
Page 202: ...6 6 29 Notes Notes Courtesy of Machine Market...
Page 203: ...29 Notes 6 7 Courtesy of Machine Market...
Page 204: ...29 Notes 6 8 Courtesy of Machine Market...
Page 205: ...29 Notes 6 9 Courtesy of Machine Market...
Page 206: ...MEMO 6 10 Courtesy of Machine Market...
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