How to Assemble Gear Case for Kubota U48-4 U55-4 Excavator

Here is an instruction show you procedures on how to assemble gear case for Kubota U48-4 and U55-4 excavators.

 

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Kubota EPC Spare Parts Catalogue 2021.06 Download

 

Assembly Procedures
Gear Case Assembly

1.Set the bearing (angular) (26) in the gear case and install it with a press.

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2.After installing it, check and make sure the groove (a) around the circumference of the bearing comes right to the center.

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(a) Circumference groove

3.Put the 99 steel balls (25) inside.

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(25) Ball

4.Wrap the plug (7) with plumber’s tape and install it.

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5.Set the floating seal installation tool (a) on the gear case (6).

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(6) Gear case

6.Apply grease to the O-ring of the seal and install the seal.

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7.Set the seal (24) in the gear case.

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(24) Seal

8.Install the seal in the gear case with the floating seal installation tool (b).

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(b) Floating seal installation tool (pusher)

9.Apply a little gear oil to the sliding surface of the seal. (4 places,every 90º)

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(24) Seal

10.Set the holder (flange) on the assembly platform.
Set the floating seal installation tool on the holder (flange).

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(c) Floating seal installation tool guide (for flange holder)

11.Apply grease to the O-ring of the seal and install the seal.

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12.Set the seal (24) in the holder (flange).

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(24) Seal

13.Install the seal on the holder (flange) with the floating seal installation tool.

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(b) Floating seal installation tool (pusher)

14.Apply a little gear oil to the sliding surface of the seal. (4 places,every 90º)

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(24) Seal

15.Install the gear case.

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(6) Gear case

16.Use clamps to press the gear case onto the holder (flange).

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Tool to use: Clamp

17.Install the nut (ring).
IMPORTANT
• Make sure the nut (ring) is securely engaged with the holder (flange) before removing the clamps.

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18.Tap around the outside of the gear case (6) with a hammer.
(4 places, every 90º)
Rotate the gear case by hand to seat the bearing (angular).
• Tool to use: Plastic hammer

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(6) Gear case

19.Install the plate (thrust, D) (16).
IMPORTANT
• Be careful that it faces the right direction.
• Install with the R face down.

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(16) Plate (thrust, D)

20.Install the set screws (27) for preventing rotation of the nut
(ring).

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21.Install the plate (thrust, B2) (22).
IMPORTANT
• Be careful that it faces the right direction.
• Install with the R face down.

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(22) Plate (thrustB, 2)

22.Install the collar (19).
IMPORTANT
• Be careful that it faces the right direction.
• Bevel side down.

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(19) Collar

23.Install the needle bearing (20).

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(20) Needle bearing

24.Install the gear (planetary B) (21).

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(21) Gear (planetary B)

25.Install the plate (thrust, B2) (18) and then the 4 axle snap rings (17).
• Tool to use: Snap ring pliers

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(17) External snap ring

26.Install the gear (sun) (15).

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27.Install the metal holder (14).

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(14) Holder

 

28.Install the plate (thrust, A) (13).
IMPORTANT
• Be careful that it faces the right direction.
• Install it with the R side down.

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(13) Plate (thrust, A)

29.Install the collar (12).

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(12) Collar

30.Install the bearing (roller)(11).

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(11) Bearing (roller)

31.Install the gear (planetary A) (10).
IMPORTANT
• Be careful that it faces the right direction.
• Install with the convex side up.

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(10) Gear (planetary A)
(11) Bearing (roller)
(12) Collar
(13) Plate (thrust, A)

 

32.Install the gear (drive) (9).

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(9) Gear (drive)

33.Measure the distance between the edges of the holder and the gear case.
This is measurement A (A).
Measure the distance between the gear case tooth surface and the gear case.

This is measurement B (B).
• Tool to use : Depth gauge
Subtract measurement B (B) from measurement A (A) to
calculate measurement C.
Select the appropriate plate (thrust, C) to suit measurement C.
Measurement A (A) minus measurement B (B) =
measurement C.
Ex.) 23.1 mm (0.909 in.) – 21.5 mm (0.846 in.) = 1.6 mm (0.063 in.)

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34.Install the selected plate (thrust, C) (8).

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(8) Plate (thrust, C)

35.Install the O-ring (4) on the cover (3).
IMPORTANT
• Apply grease to the O-ring.
• Install so the hole in the gear case aligns with the hole in the cover.

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(3) Cover (4) O-Ring

36.Tap the spring pins (5) in. (4 places)
IMPORTANT
• Be careful to orient the split in the spring pins correctly.
• The split must face to the side.
• Tool to use: hammer

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(5) Spring Pins (a) Split

37.Rotate the assembly platform 90 ° and pour in gear oil.
Fill it with gear oil until it flows out of the inspection port and then install the plug.

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

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