Cub Cadet S7237 service manual Screw, Hydraulic Oil Tank and Filter

F. Hydraulic System

WARNING:

Never overfill the hydraulic units. Damage can occur if the oil level is not within the proper operating range.

Note: When adding hydraulic oil, do so in small quan-

tities and recheck the oil level before adding more. It is important that you do not overfill the reservoir to allow for fluid expansion.

1.Hoses: Check the hoses from the hydraulic oil tank to the oil filter to the hydraulic lines daily for leaks or abrasion and replace any damaged hoses. Make certain there are no kinks or twists in any hose.

2.Hydraulic Oil Tank and Filter:

Note: Change the hydraulic oil and the oil filter ele- ment after the first 50 hours of operation and every 500 hours thereafter.

To drain the hydraulic oil tank, place a 1 gallon drain pan under the drain plug on the bottom of the hydraulic oil tank. Remove the drain plug, drain the tank, then replace the plug. Remove the three screws from the top of the oil filter and take out the oil filter element You don’t have to drain the rest of the hydraulic system. Put the replacement filter element in the oil filter and lubricate the sealing surface. Install the three screws in the top of the oil filter to secure the oil filter element. (See photo below)

Screw

Screw

Note: Always wipe off the hydraulic tank fill cap and the area around it before removing the cap to pre- vent dirt from contaminating the oil.

Remove the fill cap and fill the tank with the same 15W-40 oil and 1.5 ounces of Ornite additive selected for the filter until the oil level is a 1/4” below the oil tank fill neck. Leave this air space for expansion. Start the engine and let it run at low idle for about five minutes. Check the filter for leaks. Idling the engine and the pumps in this way will purge any air from the system. Shut off the engine and recheck the oil level in the tank. Top-off if necessary until the oil level is a 1/4” below the oil tank fill neck.

This unit is equipped with two traction drive pumps and one pump for steering and implement lift.

Note:After unit is up to operating temperature, turn off engine and re-check hydraulic oil. If oil appears foamy or contains excessive air bubbles, DO NOT OPERATE UNIT. Contact service technician.

3.Hydrostatic Pumps and Motors: The pumps are the hardest-working components in the hydraulic system. They are in operation all the time the engine is running. Because of extremely close tolerances, wear is an important factor in their life. Contami- nants in the hydraulic oil and cavitation does the greatest harm to the pumps. Cavitation is a blockage in the supply lines that produces a partial vacuum causing violent bubbling in the hydraulic oil in the pump.

Check the two suction hoses (the hoses connected to the filter) daily before starting the engine. Look for a flattened condition or any leaks and repair or replace as necessary. A flattened or leakng suction hose will permit cavitation to develop which can destroy the pumps in a short time.

Contaminants or foreign matter in the oil will also damage the pumps . To prevent this, use a filter that captures particles as small as 25 microns or 25 mil- lionths of a meter in diameter. You can help in the battle against dirt by being very careful when you remove or repair a component in the hydraulic sys- tem. Thoroughly clean off any component before you work on it. Plug the ends of any hose or line you remove with a rubber or plastic plug. Use plastic caps to seal off the ends of hydraulic fittings. Place any component you remove in a clean plastic bag so it can’t pick up dust or dirt. Clean your hands fre- quently when working on the hydraulic components.

Note: The pumps are not owner-repairable. If a pump fails, contact your Cub Cadet Commercial dealer. Do not disassemble the pump.

4.Speed Control Adjustments: The speed control pedal incorporates a Return-To-Neutral (RTN) fea- ture to provide smooth, non-jerkey, control motion while affording an automatic hydrostatic braking means.

Whenever the Park Brake is in the engaged position, a cable mechanism, connected to each drum brake on the hydrostatic wheel motors, applies force to each brake lever so that each wheel brake mechanism can prevent brake drum and wheel rotation.

Note: The engine should be able to be started

whenever the Park Brake is applied, and the speed control pedals are in Neutral.

Whenever the machine is on level ground with the engine running and the speed control pedals are in the Neutral position, the machine should not creep (I.E., move in the Forward or Reverse directions of travel). If this occurs, contact your Service represen-

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