Replacing the Hydro Pump | Cub Cadet M48 manual

M48 Tank

4.23.When the fluid is between 160-210 deg. f.

(71-90 deg. c.) apply full forward drive pressure to the lap bar with the engine running at full speed (3600 RPM) while an assistant closes the valve to the point where pressure reaches 300

PSI (21 Bar.). See Figure 4.23.

CONTROL

10 GPM CONSOLE INSET:

3600 RPM

SPINNING

FLOW

300 PSI CLOSE VALVE TO BUILD PRESSURE

Figure 4.23

NOTE: It may be necessary to over-shoot 300 PSI slightly, then open the valve to reduce pres- sure to 300 PSI.

4.24.Take note of the reading on the flow meter por- tion of the test kit when the pressure gauge reads 300 PSI.

4.25.Continue closing the valve until the pressure reading reaches 1,100 PS I (76 bar.). Take note of the flow reading. See Figure 4.25.

9 GPM

1100 PSI	VALVE CLOSED
	FURTHER

Figure 4.25

4.26.Subtract the 1,100 PSI flow reading from the 300 PSI flow reading. The resulting figure is called “flow droop”.

4.27.Interpretation: flow droop greater than 1.5 GPM indicates a pump that is not performing as well as it should.

NOTE: A blocked filter may account for some loss of performance.

4.28.Within the two year Cub Cadet Commercial war- ranty period, replace the pump if it does not per- form as specified and all other factors have been eliminated.

4.29.If a hydro pump requires repair, refer to Hydro- Gear publication “BLN-51337” for complete ser- vice instructions.

4.30.If the hydro pump and all other factors are O.K., replace the hydro motor.

NOTE: The hydro motor is not serviceable. Replace it as a unit if it fails.

5.REPLACING THE HYDRO PUMP

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

5.2.Safely lift and support the rear of the tank.

5.3.Remove the rear wheels using a 3/4” socket.

5.4.Tilt the seat up, and disconnect the negative bat- tery cable.

5.5.Remove the screen that covers the opening over the cooling fans on the hydro pump to be removed using a 3/8” wrench. See Figure 5.5.

REMOVE DEBRIS SCREEN

Figure 5.5

M48 specifications

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