Section 6
Recirculation System
20412963
8-2012/Rev 07
6-4
If the element is not replaced, and fills with debris, the bypass relief in the filter head will open to
prevent over pressurization. The relief valve opens at 50 psi (3.4 bar) on 30, 50 and 60
horsepower models, 25 psi (1.7 bar) on 100 horsepower models. When the valve opens, the oil
bypasses the filter and unfiltered oil is allowed to return to the reservoir.
The temperature/low level switch monitors the oil temperature and level in the reservoir. An
automatic shutdown will occur if the operating oil temperature exceeds 144 F (62 C). An
automatic shutdown will also occur if the oil level on a 30, 50 or 60 horsepower machine falls
below 28 gal (106 L). Low oil level shutdown occurs at 37 gal (140 L) on a 100 horsepower
machine.
6.4 Service and Maintenance Procedures
To ensure the supply of properly conditioned oil to the main hydraulic system, the components
will require routine servicing and maintenance. The procedures for servicing these components
are detailed below.
NOTE
Refer to Section 12, Parts List for a complete listing of replacement parts and part
numbers.
Hydraulic Oil Maintenance
The hydraulic oil should be replaced after 3,000 hours or one year of service, whichever comes
first. The oil should be replaced sooner if a fluid sample indicates contamination that cannot be
rectified by filtering.
An air breather and filter is located on the top of the reservoir. The air breather prevents dirt from
being sucked into the reservoir when the oil level drops, and allows air to escape when the level
rises. The air breather must not be used as a fill point. Oil must only be replaced at the fill port
on the filter head.
Do not attempt to fill the reservoir from the air breather. The oil will not be
filtered and will not conform to the cleanliness requirements of the system.
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