Kubota SM-E4B Series User Manual

ENGINE
SM-E4B SERIES, WSM
1-S46
Main Bearing Case Assembly (Z602-E4B, D902-E4B)
1. Remove the two main bearing case screws 1 (4), and remove
the main bearing case assembly 1 (1), being careful with
crankshaft bearing 3 (5) (9).
2. Remove the main bearing case assembly 2 (2) and the main
bearing case assembly (3) as above. Keep in mind, however,
that the thrust bearing (8) is installed in the main bearing case
assembly (3).
(When reassembling)
• Clean the oil passage in the main bearing cases.
• Apply clean engine oil to the bearings.
• Install the main bearing case assemblies in original positions.
Since diameters of main bearing cases vary, install them in
order of marking (b) (1 for Z602-E4B and 1, 2 for D902-E4B)
from the gear case side. (Refer to the figure.)
• Be careful not to confuse the top and bottom of the crankshaft
bearing 3 (5) (9). (Install the bearing with the oil groove (c) up.)
• Match the alignment numbers (a) on the main bearing case
assembly 1 (1).
• Do the same for the main bearing case assembly 2 (2) and the
main bearing case assembly (3) too.
• When installing the main bearing case 1 and 2, face the mark
"FLYWHEEL" to the flywheel.
• Install the thrust bearing (8) with its oil groove facing outward.
• Confirm that the main bearing case moves smoothly after
tightening the main bearing case screw 1 to the specified
torque.
9Y1210785ENS0056US0
Tightening torque Main bearing case screw 1
13 to 15 N·m
1.3 to 1.6 kgf·m
9.4 to 11 lbf·ft
(1) Main Bearing Case Assembly 1
(2) Main Bearing Case Assembly 2
(3) Main Bearing Case Assembly
(4) Main Bearing Case Screw 1
(5) Crankshaft Bearing 3
(Upper, with Oil Groove)
(6) Crankshaft Bearing 2
(Upper, with Oil Groove)
(7) Crankshaft Bearing 2 (Lower)
(8) Thrust Bearing
(9) Crankshaft Bearing 3 (Lower)
(a) Alignment Number
(b) Marking (1 or 2)
(c) Oil Groove
KiSC issued 01, 2013 A

Kubota SM-E4B Series Specifications

General

Brand	Kubota
Model	SM-E4B Series
Category	Engine
Language	English