Cub Cadet M48 service manual Testing Hydro Pump Output, Elbow

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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

 

 

LINE

 

 

PRESSURE

 

 

 

 

 

GUAGE

 

 

FLOW

 

 

 

 

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.

4

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Contents Cub Cadet M48 Tank Page Table of Contents Page Drive System Adjustment OIL Filter BatteryAbout this Section First Hole Second Hole Fluid LevelBrake Connecting ROD Rear Brake ARM Assembly Bellcrank Mounting ShaftOpen Hydro Pump Hydro Relief Valve Brake Link Brake Actuator ARMReturn to Neutral Cylinder Right Testing Hydro Pump Output ElbowJAM NUT Stop Bolt Replacing the Hydro Pump FAN NUT Washer Spring Tensioner Pulley ARMPuller Pulley NUT ROD END Bolt Lock Washer Control ARMHydro Pressure Lines Pump Between Pump Motor Adaptors Return Line Feed Line CloseElbow Mounting Bolt Pulley with KEY NEW Pump Replacing the Hydro Motor Disconnectmounting Bolts Motor PlateOrientation Marks Arrow to Fittings Brake Drum Assembly Brake Linkage Adjustment Rear Brake ARM Assembly Bushing Brake Connector ROD Shoulder NutsBrake Rear Bellcrank Link Shaft ROD Brake Link ROD Rear BrakeFront Brake SwitchAdjust Here M72 Tank M48 Tank M48 Tank Other Tank Features M48 Tank M48 Tank M48 Tank Kohler EFI Electronic Control Module Fuel pump Fuel filter is easily accessible. See Figure Electrical connection for injector Fuel injector EFI ControlsM48 Tank M48 Tank M48 Tank
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M48 specifications

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