How to Assembly Swivel Motor for Kubota U48 U55 Excavator

This instruction show you guide on how to assembly swivel motor for Kubota U48 U55 excavator.

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Swivel Motor Assembly Procedures:

1.Use the jig (7) to tap the oil seal into the gear case (6).

IMPORTANT
• Apply grease to the lip and circumference of the oil seal.

(6) Gear case
(7) Oil Seal
(A) Tap in tool
(a) 99 ± 0.05, 3.9 ± 0.002 in.
(b) 89 ± 0.05, 3.5 ± 0.002 in.

2.Press the outer race of the tapering roller bearing all the way into the gear case (6).

(6) Gear case (7) Oil Seal

3.Install to the shaft (pinion) (1) in order of plate (pinion 2) (2),plate (pinion) (3) and plate (seal) (4).
IMPORTANT
• Be careful of its direction when pressing the inner race of the tapering roller bearing (5) onto the shaft (1).
• After installing it, encapsulate the inner race of the tapering roller bearing with grease.
• Amount of grease : about 50cc (0.04 U.S.gal)

4.Press the shaft (pinion) (1) into the gear case.
IMPORTANT
• Do not scratch the oil seal.

(1) Shaft (pinion)

5.Press the inner race of the tapering roller bearing (8) onto the shaft.
IMPORTANT
• Be careful to install the inner race facing the right direction.
• After installing it, rotate the shaft by hand.
• Select and install a spacer (9) so that the gap is between 0 to 0.15mm (0.006 in.).

(6) Gear case (9) Spacer

6.Install the collar (11), needle bearing (12), gear (planetary 2) (13) and plate (thrust 2) (14) onto holder 2 (10).
7.Install the gear (sun) (16).
IMPORTANT
• Be careful to install the gears (planetary 2) facing the right direction.
• Install the gears (planetary 2) so the end without an indentation faces the holder 2.
• Install the plates (thrust 2) and external circlips (15) with the R face down.
• Tool to use : snap ring pliers

(10) Holder 2
(11) Collar 2
(12) Needle bearing
(13) Gear (planetary 2)
(14) Plate (thrust 2)
(15) External circlip
(16) Gear (sun)
(17) External circlip

8.Install the collar (19), needle bearing (20) and gear (planetary 1) (21) onto holder 1 (18).
9.Install the gear (drive) (22).
10.Install the O-ring (24) on the gear case(6).
IMPORTANT
• Be careful to install the gears (planetary 1) and (drive) facing the right direction.
• Install the gear (drive) so the indented face is toward the holder 1.
• Install the gear (planetary 1) so the indented face is toward the plate (thrust).
• Apply grease to the O-ring.

(6) Gear case
(18) Holder (1)
(19) Collar (1)
(20) Needle bearing
(21) Gear (planetary 1)
(23) Plate (thrust)
(22) Gear (drive)
(24) O-Ring

11.Measure the distance A between the top of the gear (planetary
1) and the top of the gear case.
IMPORTANT
• Select the appropriate plate (thrust) from the table below to suit the measurement of distance A.

12.Install the selected plate (thrust) (23).

(23) Plate (thrust)

13.Install the ball bearing (57) on the shaft (58).
14.Install the shaft ASSY into the housing (39).
IMPORTANT
• When installing the bearing (57) in the housing (motor,valve), install it so its inscription is visible.
• Dip the thrust plate (59) in hydraulic oil and install it so the beveled side faces the housing.
• Tool to use : plastic hammer

(39) Housing (motor and valves)
(57) Ball bearing
(58) Shaft
(59) Thrust plate
(76) O-Ring
(79) O-Ring
(82) O-Ring

15.Install the metal washer (spring) (66), spring CY (67), metal washer (spring) (68) and internal circlip (69) in the cylinder block (65).
IMPORTANT
• Install the internal circlip (69) so its R face is toward the piston.
• Apply grease to the pin and install it in the holder (retainer)
(61) and the plate (retainer) (60) in order.

(60) Plate (retainer)
(61) Holder (retainer)
(62) Piston
(63) Pin
(64) Plate (friction)
(65) Cylinder block (swivel)
(66) Metal washer (spring)
(67) Spring CY
(68) Metal washer (spring)
(69) Internal circlip

16.Lay the housing on its side.
17.Install the cylinder block sub-assembly B1, using the spline of the shaft (58) as a guide.
IMPORTANT
• Be careful not to drop the pin.
• Dip the whole ASSY in hydraulic oil and then install it.
• After installing the ASSY, check and make sure the plate (friction) is not tilted.
• Press on the cylinder block sub-assembly B1 and make sure the spring CY is working.

(57) Ball bearing
(58) Shaft
(59) Thrust plate
(64) Plate (friction)
(70) O-Ring
(71) Piston (brake)
(72) Spring (NB)
(73) O-Ring
(76) O-Ring
B1 : Cylinder block sub-assembly

18.Check the O-ring on the gear case side and install the housing (motor, valves) on the gear case.
19.Fasten it with the hex socket bolts (25)

20.Install O-rings (73) and (70) to the piston (brake) (71).
IMPORTANT
• Apply grease to the O-ring.

(70) O-Ring
(71) Piston (brake)
(73) O-Ring

21.Install the piston (brake) (71), keeping it parallel to its mating surface (housing and motor valves) as you do so.
IMPORTANT
• Be careful to install the piston (brake) facing the right direction.
• Check and make sure that the rotation-checking holes in the piston (brake) line up with the center of the shaft and the center of the pin.
• Tool to use : plastic hammer

(58) Shaft
(71) Piston (brake)
(81) Pin

22.Install O-rings (76) and (79).
23.Install the spring (NB) (72) in the piston.
IMPORTANT
• Apply grease to the O-ring.

(72) Spring (NB)
(76) O-Ring
(79) O-Ring
(82) O-Ring

24.Install the ball bearing (75) on the cover (motor) (84).
25.Install the plate (valve) (74) on the cover (84).
IMPORTANT
• When installing the ball bearing (75), install it so its inscription is visible.
• Apply grease on the plate (74) and stick it to the cover (84).
• Tool to use : plastic hammer

(74) Plate (valve)
(75) Ball bearing
(84) Cover (motor)

26.Install the cover (ASSY) on the housing (motor, valves).
27.Fasten it with the hex socket bolts (83).
IMPORTANT
• Be careful not to drop any valves (plate).