Cub Cadet 53AJ8CTX750 service manual Bypass Valve Left Side Pump, Hydraulic Oil Tank and Filter

mower is parked with the engine shut off, the hydraulic system locks the traction wheels.

Note: To move the mower forward or in reverse by pushing, you must release the dynamic braking. Locate the valves on the pump. Turn valves counter-clockwise (using a standard 7/16” wrench) one quarter turn to push the unit. After pushing the mower to the desired location, return both valves to the operating position by turning the valve clockwise, but do not overtighten (See photo below).

Bypass

Valve

Left Side Pump

When the mower is parked with the engine running and the steering levers in the neutral position, the parking brakes should be applied. The parking brakes are drum- type brakes mounted on each traction wheel. They are both engaged by the same operating lever.

1.Adjustments: The parking brake handle is an overcenter lever that should engage with moder- ate force.

Note: To increase parking brake capacity, adjust brake cables at the brake arms equally. Adjust the cable housing nuts one full turn and check parking capacity. Repeat if parking brake does not hold.

2.Repair: The mower is equipped with drum brakes and will not normally require mainte- nance. If they are not working properly, please contact your service center.

F.Hydraulic System

WARNING:

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

Note: When adding hydraulic oil, do so in small quantities and recheck the oil level before adding more. It is important that you do not over- fill 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 fil- ter element after the first 50 hours of operation and every 500 hours thereafter.

To drain the hydraulic oil tank, place a 2 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 prevent dirt from contaminating the oil.

Remove the fill cap and fill the tank with the same 15W40 oil 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 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.

Note: After unit is up to operating tempera- ture, turn off engine and re-check hydraulic oil. If oil appears foamy or contains excessive air bub- bles, 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. Contaminants 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

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