HYDRAULIC SYSTEM MLC650 SERVICE/MAINTENANCE MANUAL
2-24
Published 09-09-16, Control # 229-09
Changing the Hydraulic Oil
See Figure 2-23 for the following procedure.
Drain and fill the hydraulic tank according to the interval
specified in the MLC650 lube guide, unless an alternate
interval has been established through an oil analysis
program.
1. Operate the crane until the hydraulic oil is at normal
operating temperature. This will help prevent impurities
from settling in the system.
2. Stop the engine.
3. Open the air vent valve (2) to allow air to enter into and
escape from the hydraulic tank when draining and filling.
FIGURE 2-23
Item Description
1 Shut-off Handle
2 Air Vent Valve (qty 2)
3 Access Cover (qty 3)
4 Quick Drain Valve
5Strainer
6 Power Fill Coupling
7 Manual Fill Port
8 Sight Level Gauge
WARNING
Burn Hazard!
Hydraulic oil may be under pressure and extremely hot
and can cause severe burns if contact is made.
Hot oil can escape when removing the filter cover or fill
plug. Allow the hydraulic system to cool and relieve
pressure at the air valve in the tank before servicing.
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