6
Hydraulic Oil
1.) As you sit in the operator seat, there is an oil sight gauge under left side of the seat. The oil sight gauge is in the
hydraulic oil tank.
2.) Most hydraulic oil is yellow-green in color. If the tank is full, the oil sight gauge should have a yellow-green tint. The
oil level should be up to the black line at the top of the oil sight gauge.
3.) If the oil level is not up to the black line, remove the cap between the seat and control levers. Fill the tank slowly
with 10wt hydraulic oil (Northern Item #4040) while checking the oil sight gauge. Once the tank is full, screw the
cap back on the tank.
Changing the Hydraulic Oil
1.) Remove the drain plug on the bottom part of the frame below the engine. Once the old hydraulic oil is removed,
tighten the drain plug back onto the rank. Be sure to properly dispose of the old hydraulic oil.
2.) Remove breather cap between the seat and control levers. Fill the tank with 10wt hydraulic oil (Northern Item
#4040), while checking the oil level on the sight glass. Pour slowly to allow air to get out of the tank easily. The oil
level should be up to the black line at the top of the oil sight gauge. Screw the cap back onto the tank.
4.) Remove the up-down travel pin and the side-to-side travel pin.
3.) Start the engine and run at slow idle.
5.) Push and pull lever #4 back an forth 6-8 times to remove air from the hydraulic lines. While moving the lever,
watch the clear hose on the right side under the control levers. If there is a steam of bubbles, that is normal. If a
foamy solution is moving through the tube, air is still in the oil. Keep pushing a pulling the lever until the stream of
bubbles appears. After lever #4 is completed, do the same with lever #3, lever #2, and lever #1. Watch the oil
level gauge as you complete each lever. You may have to add more hydraulic oil to the tank to complete all four
levers. Once all four levers are done, fill the tank up to the black line on the oil sight gauge in the hydraulic tank.
The whole hydraulic system contains about 2-1/2 gallons of oil. Shut off the engine.
6.) Reattach the up-down and side-to-side traveling pins.
