Kubota B1830 Workshop Manual page 151

B1830,B2230,B2530,B3030, WSM
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.
Tightening torque Main bearing case screw 2
(1) Main Bearing Case Screw 2
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.
Tightening torque Main bearing case screw 1
(1) Main Bearing Case Assembly 1
(2) Thrust Bearing
(3) Main Bearing Case Screw 1
1-S50
ENGINE
49.0 to 53.9 N·m
5.0 to 5.5 kgf·m
36.2 to 39.8 lbf·ft
9Y1210003ENS0073US0
29.4 to 34.3 N·m
3.0 to 3.5 kgf·m
21.7 to 25.3 lbf·ft
(a) Alignment Number
(b) Marking (A, B, C)
9Y1210003ENS0074US0
KiSC issued 05, 2012 A