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Larger Capacity Hydraulic Reservoir
The hydraulic reservoir capacity has been increased 68 percent, from 12.5 gallons (47.3 L) to 21 gallons (79.5 L). This increase results in more efficient cooling and lower hydraulic-oil system temperatures.
Suction Screen
A 55-mesh wire screen on the suction side of the hydraulic pump helps assure clean oil is entering the pump.
Improved Hydraulic Pump Coupler
The 580K's new hydraulic pump coupler gives improved reliability and serviceability with the following features:
□ A larger diameter spline.
□  Larger rubber bushings bonded to the steel spline bushings.
□ Slides back on the pump shaft so that the fan belt can be replaced without removing the pump, for time-saving service.
□ No need for periodic maintenance lubrication.
Hydraulic Reservoir Cleanout Holes
To facilitate easy cleaning of the hydraulic reservoir, the 580K features two large clean-out holes on the suction and return sides of the reservoir.
Hydraulic Reservoir Sight Gauge
An operator can conveniently check the hydraulic reservoir oil level by observing an external sight gauge on the reservoir, instead of using a dipstick.
 

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