Checking Hydraulic Control System
Check oil level every 10 service hours when the oil is cool. Position the tractor and hydraulically controlled equipment so the cylinder pistons can be extended.
(163 AND 153 HYDRAULIC CONTROL)
Clean dirt from around filler cap and remove cap. Oil should be to the full mark on the gauge (1) of the 163 and 153 Hydraulic Control.
On the 161, 151, 143 and 141 Hydraulic Control the sight gauge on the side of the oil supply tank provides a convenient means of checking for adequate oil in the system. If oil is visible in the sight gauge there is adequate supply of oil in the system, however, whenever any doubt exists check the oil level in the filler opening. Oil should be visible in the filler opening.
Hydraulic Control System Oil Filter
Replace the filter element every 500 service hours, however, see the topic, "Draining Hydraulic Control System", when filter element change periods coincide with the hydraulic system drain periods.
At intervals not coinciding with the hydraulic control system drain periods, position the hydraulically controlled equipment so the piston is extended.
Service the filter by removing the filter cover assembly and two used filter elements. Replace the filter elements (2) with new AVSpare filter elements. Replace the seal in the cover and install the cover.
At intervals other than drain periods, open the bleeder valve on the filter cover, start the engine and fill the hydraulic system with oil. When oil flows from the bleeder valve without air bubbles, close the valve. See the topic, "General Information On Filling The Hydraulic Control System".
Draining Hydraulic Control System
(163 AND 153 HYDRAULIC CONTROLS)
Every 2000 service (See Note A) hours drain the hydraulic system. Position the tractor and hydraulically controlled equipment so the cylinder piston can move a complete stroke.
(161, 151, 143 AND 141 HYDRAULIC CONTROLS)
Stop the engine. Remove the filler cap to relieve pressure. Remove drain plug (3). Move the control lever to satisfactorily drain the system. This occurs when the hydraulically controlled equipment piston has moved a complete stroke. Service the hydraulic system filter and clean the filler strainer (4) at each oil change period. Install the drain plug.
General Information On Filling Hydraulic Control System
Before starting the engine open the bleeder valve (6), fill the hydraulic control tank (5) and close the bleeder valve.
Install filler cap finger tight. Start and run the engine at low idle speed. Open the bleeder valve. Close the valve when the oil flowing from it contains no air bubbles. With the engine running at half speed, operate the control lever to fill the lines and cylinder. Move the piston a small amount, then fill the tank to prevent aeration of the oil. Repeat this procedure until the system is filled and oil level is to the "full" mark on gauge of the 163 and 153 Hydraulic Control or visible in the sight gauge of the 161, 151, 143 and 141 Hydraulic Controls. Tighten the filler cap. With the engine running at low idle speed open the bleeder valve (6). Close the bleeder valve when the oil flowing from it contains no air bubbles.
Check oil level several times during the first day of operation after filling. Be careful when removing the filler cap when the oil is warm because pressure in the tank may force out oil when the cap is removed.
Make sure the filler cap gasket is in good condition and install the cap tightly.
Note A: Change oil at 1000 service hours if machine is operated at temperatures 100° F (38° C) or higher for extended periods.