How to Disassembly Pump for Kubota U48-4 Excavator

This instruction show you guide on how to disassemble pump for Kubota U48-4 excavator.

 

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Procedures:

1.Remove the gear pump (46).

• Tool to use: M8 hex socket

Gear Pump (47) Socket head bolt

2.Lift the input axle up and clamp the pump in a vise.

IMPORTANT

• Take care not to scratch the suction or discharge ports in the vise.

(49) Socket head bolt

3.Loosen the bolt and remove flange (3).

CAUTION

• If the flange is difficult to remove, tap lightly on it with a plastic hammer and take it apart.
• Don’t pinch your fingers between the flange and the case.
• Tool to use: M10 hex socket

(3) Flange

4.Remove the screw (13) and the bushing (12).

• Tool to use: M3 hex socket

(12) Bushing

(13) Screw

5.Remove the snap ring (6) from the flange (3).

CAUTION

• Take care so the snap ring does not go flying.
• Tool to use: Snap ring pliers

(3) Flange

(6) Snap ring

6.Remove the oil seal and the needle bearing from the flange.

7.Remove the gasket (10).

CAUTION

• Be careful not to cut your fingers on the gasket.

(10) Gasket

8.Remove the thrust washer (9) from the shaft (7).

(7) Shaft

(9) Thrust washer

9.Remove the swash-plate (24).

(24) Swash-plate

10.Remove the shaft (7).

(7) Shaft

11.Remove the cylinder block ASSY .

• Cylinder Block ASSY Components

Cylinder block, collar, spring, collar, snap ring, pin, piston ASSY, retainer holder, retainer plate

12.Remove the thrust washer (8).

(8) Thrust washer

13.Remove the valve plate (14).

(14) Valve plate

IMPORTANT

• Do not scratch the valve plate.

14.Remove the pins (30) & (73).

(30) Pin

(73) Pin

15.Remove the pin(26).

(26) Pin

16.Remove the nut (45).

IMPORTANT

• Measure the width of L before removing the nut.
• Tool to use: Monkey wrench

(45) Nut

17.Remove the valve ASSY (34).

(34) Valve ASSY

18.Remove the valve ASSY (51).

• Tool to use: M5 hex socket

(51) Valve ASSY

(66) Socket head bolt

19.Remove O-rings (27) & (77).

(27) O-Ring

(77) O-Ring

20.Remove the orifice (78) of the valve ASSY.

• Tool to use: M3 hex socket

(78) Orifice

More repair case for Kubota,please refer to:Kubota Trouble Repair