Kubota U48-4 Excavator Travel Motor Disassembly Guide

This instruction show you guide on how to disassembly travel motor for Kubota U48-4 excavator.

 

Related Contents:

Takeuchi Excavator Workshop EPC+Service Manual 2018 PDF Files

2022 Kubota Takeuchi Diagmaster v22.08.01 v4.1.2 Software Free Download

Kubota EPC Spare Parts Catalogue 2021.06 Download

 

Disassembly Procedures
[A] Gear Case Disassembly

1.Attach the travel motor to the special disassembly platform.

2.Tap the spring pins in. (4 places)
• Tool to use: Hammer and pin punch (ϕ4)

(5) Spring Pins

3.Attach the cover-removal tool and knock it up to remove the cover (3).
IMPORTANT
• After removing the cover, remove the spring pin from the cover.

If a cover removal tool is not available
• Remove the 2 plugs and attach eye-bolts.
• Put the rod through the eyebolt holes.
• Knock upwards on both sides of the rod and remove the cover.
• Tool to use: Eyebolts & round rod

(3) Cover (d) Cover removal tool

4.Remove the plate (thrust, C) (8).

(8) Plate (thrust, C)

5.Remove the holder and sub-assembly.

Components of the holder & sub-assy

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

6.Remove the gear (drive) (9)

(9) Gear (drive)

7.Remove the gear (sun) (15).

(15) Gear (sun)

8.Drain off any gear oil.
If there is not any gear oil, skip this step.

9.Remove the 4 axle snap rings (17).
• Tool to use: Snap ring pliers

(17) External snap ring (18) Plate (thrust, B2)

10.Remove the plate (thrust, B2) (18).

(18) Plate (thrust, B2)

11.Remove the gear (planetary, B) (21)

(21) Gear (planetary B)

12.Remove the needle bearing (20).

(20) Needle bearing

13.Remove the collar (19).

(19) Collar

14.Remove the plate (thrust, B2) (22).

(22) Plate (thrustB, 2)

15.Remove the plate (thrust, D) (16).

(16) Plate (thrust d)

16.Remove the 2 set screws (M8 Sealock)
• Tool to use: M4 hex socket

(27) Set screw (M8 Sealock)

17.Remove the nut (ring).

(e) Ring nut socket

18.Tap the gear case (6) alternately on its sides with a plastic hammer.
• Tool to use: Plastic hammer

(6) Gear case

19.Rmove the gear case (6) from its holder (flange) (28).

(6) Gear case (28) Holder (flange)

20emove the seal (24) from the gear case side.
• Tool to use: Slotted screwdriver

(24) Seal

21emove the seal (24) from the flange holder side.
• Tool to use: Slotted screwdriver

(24) Seal

2.Remove the plug (7).
• Tool to use: M5 hex socket

(7) Plug

23.Remove the balls (25). (99 balls)
IMPORTANT
• Do not lose any of the balls.
• If you fail to remove even one of the balls, the bearing cannot be removed, so keep close track of the balls.

(25) Ball

24.Remove the bearing (angular) with a press.

 

[B] Motor Disassembly

1.Remove the anti-cavitation parts.
Remove the plug (94), spring (anti-cavitation) (97), spool
(anti-cavitation) (98) in order.
• Tool to use: M8 hex socket

(94) Plug
(97) Spring (anti-cavitation)
(98) Spool (anti-cavitation)

2.Remove the body (anti-cavitation) (99).
IMPORTANT
• Replace O-rings (92) (93) with new ones during reassembly.
• Tool to use: M6 hex socket

Body (anti-cavitation), ASSY Components

(92) O-Ring
(93) O-Ring
(94) Plug
(97) Spring (anti-cavitation)
(98) Spool (anti-cavitation)
(99) Body (anti-cavitation)
(100)Hex socket bolt

3.Remove the 2-speed switch.
Remove the plug (83), pipe connector (2-speed) (88), spool
(2-speed, S) (85), spring (2-speed, S) (86), spool (2-speed switch) (87) in order.
IMPORTANT
• Check to make sure there are not any scratches around the circumference of the spools.
• Tool to use: M8 hex socket, M22 socket wrench Components of the 2-speed Switch

(83) Plug
(85) Spool (2-speed, S)
(86) Spring (2-speed, S)
(87) Spool (2-speed switch)
(88) Pipe connector (2-speed)

4.Remove the high-pressure selector.
Remove the plug and spool (80) in order.
• Tool to use: M8 hex socket

(80) Spool (high pressure selector)

5.Remove the plug.
CAUTION
• There is little room for the wrench (or socket), so be careful not to let it slip.
• Tool to use: M36 wrench (socket)

6.Remove the plug (68), compression spring (70), metal washer (spring) (71) and plunger (counterbalance) (76) in order.
IMPORTANT
• Check to make sure there are not any scratches around the circumference of the spools.

(68) Plug
(70) Compression spring
(71) Metal washer (spring)
(76) Plunger (counterbalance)

7.Remove the hex socket bolt (89).
• Tool to use: M8 hex socket

(59) Body (counterbalance) (89) Hex socket bolt

8.Tap the body (counterbalance) with a plastic hammer to raise it.
Insert a slotted screwdriver into the gap and tap the body (counterbalance) from the opposite side with the hammer to remove it.
IMPORTANT
• Be very careful because using force to insert a slotted screwdriver may scratch the body (counterbalance).

9.Remove the valve plate (valve) (53) and O-rings (29) & (60).

(29) O-Ring
(53) Plate (valve)
(60) O-Ring

10.Remove the eight (NB1) springs (50) and four (NB2) springs (51).

(50) Spring (NB1)

(51) Spring (NB2)

11.While pressing down on the piston brake with a rag, blow air through the brake release oil passage hole (b) and remove the piston brake.
CAUTION
• Be careful not to blast too much air as doing so may cause the piston brake to go flying.
• The brake release oil passage hole is the larger of the bolt holes (3 bolts), so make sure you use the correct one.

(a) 2-speed switch oil passage hole (b) Brake release oil passage hole41

12.Rotate the disassembly/assembly platform 90° and remove the plate (friction) (46), cylinder block and sub-assembly

(46) Plate (friction)

Components of the Cylinder Block & Sub-assy

(37) Holder (retainer)
(38) Piston, ASSY
(39) Pin
(40) Plate (retainer)
(41) Cylinder block (travel)

13.Remove the swash-plate (variable).

(36) Swash-plate (variable)

14.Turn the assembly platform back to its original position and remove the piston, ASSY (B2)(31) and spring (piston B) (30).

(30) Spring (piston B) (31) Piston, ASSY (B2)

15.Remove the two steel balls (35).

(35) Steel ball

16.Remove the shaft (34) and bearing (33).

(33) Bearing (34) Shaft

17.Turn the assembly platform over and remove the oil seal (32).
When you removed the shaft, if the ball bearing did not come off,remove it together now.
• Tool to use: hammer and slotted screwdriver

(28) Holder (flange) (32) Oil seal

Enlarged view

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