Testing Hydro Pump Output, Elbow | Cub Cadet M48 specs

M48 Tank

3.18.If one side does not drive as effectively as the other, test the output of the hydro pump to deter- mine if the problem lies in the pump or the hydro motor. By the process of elimination, if perfor- mance is lacking, brake drag is eliminated, adjustment is correct, and the pump is O.K., then the problem is the motor. Pressure and flow tests will be used to determine if the pump is the the source of the problem.

4.TESTING HYDRO PUMP OUTPUT

NOTE: The log splitter hydraulic test kit is used for this set of flow and pressure tests.

4.1.Safely lift and support the rear of the M48.

4.2.If the cutting deck is currently on the unit, remove it.

4.3.Remove the rear wheels using a 3/4” socket. See Figure 4.3.

4.4.Thoroughly clean the area surrounding any hydraulic fittings to be loosened or removed.

4.5.If the unit has been run recently, allow it to cool before doing loosening any hydraulic fittings.

WARNING: Hot hydraulic fluid can cause seri- ous burns.

WARNING: Release of pressurized hydraulic fluid can cause serious of fatal injury.

4.6.Open the relief valve on the hydro pump that is to be tested. This will relieve any residual hydraulic pressure.

4.7.Confirm that the hydraulic pressure has been relieved by rotating the brake drum / hub assem- bly. If the it will not rotate, confirm that the brake is released and that the brake linkage is not bound.

4.8.Install a 1/2” JIC double male coupler in one end of the 18” hydraulic line in the test kit. Install a 90 deg. 1/2” JIC double male elbow in the other end. See Figure 4.8.

1/2” JIC COUPLER

	VALVE		18” HYDRAULIC
	VALVE			LINE
		PRESSURE		LINE
		PRESSURE
		GUAGE
FLOW
METER				1/2” JIC
METER				1/2” JIC
				ELBOW

HIGH PRESSURE LINES: TOP: in-forward / out-reverse

BOTTOM: out-forward / in-reverse BRAKE DRUM HYDRO MOTOR

Figure 4.3

NOTE: The fittings on the lines that connect the hydro pumps to the hydro motors are 1/2” JIC.

NOTE: 7/8” and 13/16” wrenches will be needed for this test. A 1” wrench may be needed to hold the connector that joins the JIC line connection to the O ring connection on the hydro motor.

Figure 4.8

4.9.Position a catch pan beneath the hydro motor. Have the hydraulic pressure and flow test kit and two 1/2” JIC plugs within reach.

NOTE: The fittings on the ends of the test kit are all 1/2” JIC.

4.10.Disconnect the upper line from the hydro motor and quickly install a 1/2” JIC plug in the line. It only needs to be finger tight.

M48 specifications

Cub Cadet has long been a name synonymous with quality and reliability in outdoor power equipment. Among its impressive lineup are the M48, M72, M54, 48, and 60 models, each designed to provide efficient and effective lawn maintenance solutions for both residential and commercial users. These zero-turn mowers embody advanced technology and engineering excellence that cater to the diverse needs of landscapers and homeowners alike.

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Cub Cadet M48 service manual Testing Hydro Pump Output, Elbow

Models: M48

4.TESTING HYDRO PUMP OUTPUT

ELBOW

M48 specifications