Kubota B1830, Workshop Manual

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ENGINE B1830,B2230,B2530,B3030, WSM
1-S50
Crankshaft Assembly
1. Remove the main bearing case screw 2 (1).
2. Pull out the crankshaft assembly.
IMPORTANT
• Take care to protect crankshaft bearing 1 from scratches,
caused by the crank gear, etc.. (Wrap the gear in vinyl tape,
etc.).
(When reassembling)
• Clean the oil passage of the crankshaft with compressed air.
• Apply oil to the main bearing case screw 2 (1).
• Install the crankshaft assembly, aligning the screw hole of main
bearing case with the screw hole of crankcase.
• Clean the oil passage of the crankshaft with compressed air.
9Y1210003ENS0073US0
Main Bearing Case Assembly
1. Remove the two main bearing case screws 1 (3) of each main
bearing cases.
2. Remove the main bearing case from crankshaft.
(When reassembling)
• Clean the oil passage in the main bearing cases.
• Apply clean engine oil on the bearings.
• Install the main bearing case assemblies in original positions.
Since diameters of main bearing cases vary, install them in
order to marking
(b) ( A , B , C ) from the gear case side.
• Match the alignment numbers (a) on the main bearing case
assembly 1.
• When installing the main bearing case 1 and 2, face the mark
"FLYWHEEL" to the flywheel.
• Install the thrust bearing (2) 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.
9Y1210003ENS0074US0
Tightening torque Main bearing case screw 2
49.0 to 53.9 N·m
5.0 to 5.5 kgf·m
36.2 to 39.8 lbf·ft
(1) Main Bearing Case Screw 2
Tightening torque Main bearing case screw 1
29.4 to 34.3 N·m
3.0 to 3.5 kgf·m
21.7 to 25.3 lbf·ft
(1) Main Bearing Case Assembly 1
(2) Thrust Bearing
(3) Main Bearing Case Screw 1 (a) Alignment Number
(b) Marking (A, B, C)
KiSC issued 05, 2012 A