F C
Hydraulic oil
gauge at 3/4 full
76347-385 • 06 -15
4.19
the fluid should be changed. When a dark spot remains in the middle but
lighter-colored oil migrates outward in the blotter paper, the oil has or is
about to dump sludge or other products into the system. This indicates that
the time for fluid replacement has passed.
Under normal conditions hydraulic oil should be changed every 2000
operating hours or yearly, which ever comes first. In more severe conditions
it should be changed every 1000 hours or six months. Always use hydraulic
oil that contains anti-wear additives. Always keep the level of oil in the tank
at 3/4 full. Failure to do so can result in air getting into the pump, a
reduction of oil pressure, and slow operation.
Hydraulic Oil Filter
The hydraulic oil filter should be replaced after 500 hours of operation or
when the hydraulic oil is changed. Always use a filter rated at 10 micron.
Hydraulic Oil Pump
The hydraulic pump is critical to the operation of the chipper. Operators
should always be alert for possible problems with the pump during
operation. Symptoms indicating problems with the pump include
(see Table 4.6):
• A noisy pump
• Overheating
• High discharge pressure
• Pump not pumping
• Low system pressure
• Sluggish start-up
Troubleshooting the hydraulic system involves talking with the operators,
understanding the schematics, and inspection of the machine. After
identifying the problem determine the root causes. It is possible there is
more than one cause of the malfunction.
Start by creating a list of possible causes. Put the easiest ones to eliminate
and do not require dis-assembly or down time first. Systematically test,
eliminate, or repair possible causes.
Initiate corrective action to avoid future maintenance problems and
operation downtime.
Figure 4.16
Table 4.5 • Hydraulic System Maintenance Schedule
Item Maintenance Schedule
Oil Maintain level at 3/4 full Daily or as needed
Test 250 hours or signs of
degradation
Change (under normal conditions) 2,000 hours or yearly
Change (under severe conditions) As needed
Filter Replace (with filter rated 10 micron) 400 hours or with change
Pump As needed See troubleshooting chart
Hoses &
Fittings
Replace When worn or damaged
General Maintenance • Hydraulics
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