Wright Serial #55142 and higher - Manual (Page 24)

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WARNING
6.5 How to Move the Mower if the Engine Won’t Start
Rotate both of the hydro bypass valves on the front of each
hydraulic pump about ½ turn counterclockwise. It is important
not to over tighten these valves. Damage may occur to the
pump if this valve is over tightened.
6.6 Hydraulic System
Whenever servicing the hydraulic system, it is of the utmost importance to keep any dirt or debris from
getting into the system. Clean off all parts before disassembly and assembly. When any of the hydraulic
parts are disconnected or removed or when the oil is changed, air must be bled from the system. If air is
entrained in the system, loss of power, excessive heat, and damage to the hydraulic pumps may occur.
First, make sure the oil level in the reservoir is correct. The level should be between 1”-1.5” below the top
of the oil fill tube. Use fully synthetic oil: Mobil1 15W-50. Lift the mower so that the rear wheels are off
the ground. Be careful to support the mower so that it will not fall or tip while the system is bled of air.
With the bypass valves open and the engine running, slowly move the control levers back and forth five or
six times. Now close the bypass valves and with the engine running, slowly move the control levers back
and forth five or six times. It may be necessary to repeat the above steps until all the air is purged and
the rear wheels are turning at normal speed. After purging is complete, adjust the oil level in the reservoir
if necessary.
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Low Pressure Hose
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High Pressure Hose
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Arrow indicates direction of flow
Hydro
Tank
Filter
Filter
Cooler