Wright Serial # 69788 and Higher - Manual (Page 27)

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6.4 How to Move the Mower if the Engine Won’t Start
Rotate both of the hydro bypass valve levers on the side of each hydraulic pump
about ½ turn counterclockwise. It is important not to over tighten these levers.
Damage may occur to the pump if this valve is over tightened.
6.5 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.

Low Pressure Hose

High Pressure Hose

Arrow Indicates Direction of Flow
6.6 Hydro Oil Tank Check/Fill
Checking oil

Ensure mower is on a level surface.

Lift hinged pad.

Hydro oil should be in the center of the sight glass.
Filling oil

Lift hinged pad and remove vent cap from top of hydro tank.

Using a funnel, fill tank until oil reaches the center of the sight glass.
6.7 Bleeding Air from the Hydraulic 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 oil should be level with the bottom
threads of the oil level port. 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.