Section 6
Recirculation System
20412963
8-2012/Rev 07
6-7
1. Start the pump in recirculation mode, count two seconds and turn the pump off.
2. Repeat this process six times before allowing the hydraulic pump to create pressure.
Oil Filter Maintenance
If the filter element is not properly serviced and fills with debris, the oil will be forced through
the relief valve, bypassing the filter. The bypass relief valve on 30, 50 and 60 horsepower models
opens at 50 psi (3.4 bar), it opens at 25 psi (1.7 bar) on 100 horsepower models. The filter
element must be replaced when the pressure gauge or indicator meets the criteria listed in Table
6-2.
Table 6-1
Hydraulic Oil Filter Change Criteria
Horsepower Indicator Criteria
30
50
60
Numeric pressure gauge
Replace filter element when the pressure reading is 40
psi (2.8 bar) or greater during normal operating
conditions.
100 Differential pressure indicator
Replace filter element when the indicator is in the
yellow zone or entering the red zone during normal
operating conditions.
Note:
Normal operating conditions indicate the machine is running and the oil temperature has
reached 115 F (46 C).
Figure 6-5: Oil Filter Assembly
1. Use a filter wrench to unscrew the filter element from the filter head. Make sure the old
gasket is removed with the element.
2. Lubricate the gasket on the new element with fresh oil.
3. Use the filter wrench to screw the new element onto the filter head and hand-tighten. Do
not over tighten.
4. Start the machine and check for leaks.
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