6.1.15 Checking oil clearance between tappet and tappet guide bore ............................................ 3-53
6.2 Timing gears, camshaft and governor gear.....................................................................................3-54
6.2.1 Checking timing gear backlash...............................................................................................3-54
6.2.2 Checking idle gear 1 side clearance.......................................................................................3-54
6.2.3 Checking camshaft side clearance .........................................................................................3-54
6.2.4 Checking camshaft alignment.................................................................................................3-55
6.2.5 Checking cam height ..............................................................................................................3-55
6.2.6 Checking oil clearance of camshaft journal ............................................................................3-55
6.2.7 Checking oil clearance between idle gear 1 shaft and idle gear bushing ............................... 3-56
6.2.8 Replacing idle gear bushing ...................................................................................................3-56
6.3 Piston and connecting rod...............................................................................................................3-56
6.3.1 Checking piston pin bore I.D...................................................................................................3-56
6.3.2 Checking oil clearance between piston pin and small end bushing........................................ 3-56
6.3.3 Replacing small end bushing..................................................................................................3-57
6.3.4 Checking connecting rod alignment........................................................................................3-57
6.3.5 Checking piston ring gap ........................................................................................................3-57
6.3.6 Checking clearance between piston ring and piston ring groove ........................................... 3-58
6.4 Crankshaft.......................................................................................................................................3-58
6.4.1 Checking crankshaft side clearance .......................................................................................3-58
6.4.2 Checking crankshaft alignment...............................................................................................3-59
6.4.3 Checking oil clearance between crankpin and crankpin bearing............................................ 3-59
6.4.4 Checking oil clearance between crankshaft journal and crankshaft bearing 1 ....................... 3-60
6.4.5 Replacing crankshaft bearing 1 ..............................................................................................3-61
6.4.6 Checking oil clearance between crankshaft journal and crankshaft bearing 2 and
crankshaft bearing 3 ...............................................................................................................3-62
6.5 Cylinder ...........................................................................................................................................3-63
6.5.1 Checking cylinder wear...........................................................................................................3-63
6.5.2 Correcting cylinder (Oversize) ................................................................................................3-63
6.6 Oil pump..........................................................................................................................................3-64
6.6.1 Checking rotor lobe clearance ................................................................................................3-64
6.6.2 Checking clearance between outer rotor and pump body ...................................................... 3-64
6.6.3 Checking clearance between rotor and cover ........................................................................3-64
6.7 Relief valve spring...........................................................................................................................3-65
6.7.1 Checking relief valve...............................................................................................................3-65
MECHANISM .....................................................................................................................................................4-1
1. Structure of transaxle ...............................................................................................................................4-1
2. Traveling system.......................................................................................................................................4-2
2.1 Hydrostatic transmission ...................................................................................................................4-2
2.1.1 Structure of hydrostatic transmission........................................................................................4-2
2.1.2 Oil flow of hydrostatic transmission ..........................................................................................4-3
2.1.3 Structure of HST control linkage...............................................................................................4-8
2.1.4 Speed set linkage .....................................................................................................................4-9
2.2 Range gear shift section .................................................................................................................4-12
2.2.1 Structure of range gear shift ...................................................................................................4-12
2.3 Front wheel drive section ................................................................................................................4-13
2.3.1 Structure of front wheel drive..................................................................................................4-13
2.4 Differential gear section...................................................................................................................4-14
2.4.1 Structure of differential gears..................................................................................................4-14
2.4.2 Structure of differential lock ....................................................................................................4-16
2.5 Brake section ..................................................................................................................................4-17
2.5.1 Structure of brake system.......................................................................................................4-17
3. PTO system ............................................................................................................................................4-19
3.1 Structure of PTO system .................................................................................................................4-19
3.1.1 Function of PTO clutch relief valve .........................................................................................4-20
3.1.2 Engaged function of PTO clutch .............................................................................................4-20
3.1.3 Disengaged function of PTO clutch ........................................................................................4-20
vi
BX23S, LA340, BT603, RCK54D, RCK60D, RCK54, RCK60B
KiSC issued 03, 2017 A
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